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0e552595d0f1-4
|
create_assertions_prompt,
check_assertions_prompt,
revised_summary_prompt,
are_all_true_prompt,
verbose=verbose,
)
return cls(sequential_chain=chain, verbose=verbose, **kwargs)
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/llm_summarization_checker/base.html
|
ec2a87816274-0
|
Source code for langchain.chains.graph_qa.cypher
"""Question answering over a graph."""
from __future__ import annotations
from typing import Any, Dict, List, Optional
from pydantic import Field
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.manager import CallbackManagerForChainRun
from langchain.chains.base import Chain
from langchain.chains.graph_qa.prompts import CYPHER_GENERATION_PROMPT, CYPHER_QA_PROMPT
from langchain.chains.llm import LLMChain
from langchain.graphs.neo4j_graph import Neo4jGraph
from langchain.prompts.base import BasePromptTemplate
[docs]class GraphCypherQAChain(Chain):
"""Chain for question-answering against a graph by generating Cypher statements."""
graph: Neo4jGraph = Field(exclude=True)
cypher_generation_chain: LLMChain
qa_chain: LLMChain
input_key: str = "query" #: :meta private:
output_key: str = "result" #: :meta private:
@property
def input_keys(self) -> List[str]:
"""Return the input keys.
:meta private:
"""
return [self.input_key]
@property
def output_keys(self) -> List[str]:
"""Return the output keys.
:meta private:
"""
_output_keys = [self.output_key]
return _output_keys
[docs] @classmethod
def from_llm(
cls,
llm: BaseLanguageModel,
*,
qa_prompt: BasePromptTemplate = CYPHER_QA_PROMPT,
cypher_prompt: BasePromptTemplate = CYPHER_GENERATION_PROMPT,
**kwargs: Any,
|
https://python.langchain.com/en/latest/_modules/langchain/chains/graph_qa/cypher.html
|
ec2a87816274-1
|
**kwargs: Any,
) -> GraphCypherQAChain:
"""Initialize from LLM."""
qa_chain = LLMChain(llm=llm, prompt=qa_prompt)
cypher_generation_chain = LLMChain(llm=llm, prompt=cypher_prompt)
return cls(
qa_chain=qa_chain,
cypher_generation_chain=cypher_generation_chain,
**kwargs,
)
def _call(
self,
inputs: Dict[str, Any],
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Dict[str, str]:
"""Generate Cypher statement, use it to look up in db and answer question."""
_run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
callbacks = _run_manager.get_child()
question = inputs[self.input_key]
generated_cypher = self.cypher_generation_chain.run(
{"question": question, "schema": self.graph.get_schema}, callbacks=callbacks
)
_run_manager.on_text("Generated Cypher:", end="\n", verbose=self.verbose)
_run_manager.on_text(
generated_cypher, color="green", end="\n", verbose=self.verbose
)
context = self.graph.query(generated_cypher)
_run_manager.on_text("Full Context:", end="\n", verbose=self.verbose)
_run_manager.on_text(
str(context), color="green", end="\n", verbose=self.verbose
)
result = self.qa_chain(
{"question": question, "context": context},
callbacks=callbacks,
)
return {self.output_key: result[self.qa_chain.output_key]}
By Harrison Chase
|
https://python.langchain.com/en/latest/_modules/langchain/chains/graph_qa/cypher.html
|
ec2a87816274-2
|
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/graph_qa/cypher.html
|
95ad4b231642-0
|
Source code for langchain.chains.graph_qa.base
"""Question answering over a graph."""
from __future__ import annotations
from typing import Any, Dict, List, Optional
from pydantic import Field
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.manager import CallbackManagerForChainRun
from langchain.chains.base import Chain
from langchain.chains.graph_qa.prompts import ENTITY_EXTRACTION_PROMPT, PROMPT
from langchain.chains.llm import LLMChain
from langchain.graphs.networkx_graph import NetworkxEntityGraph, get_entities
from langchain.prompts.base import BasePromptTemplate
[docs]class GraphQAChain(Chain):
"""Chain for question-answering against a graph."""
graph: NetworkxEntityGraph = Field(exclude=True)
entity_extraction_chain: LLMChain
qa_chain: LLMChain
input_key: str = "query" #: :meta private:
output_key: str = "result" #: :meta private:
@property
def input_keys(self) -> List[str]:
"""Return the input keys.
:meta private:
"""
return [self.input_key]
@property
def output_keys(self) -> List[str]:
"""Return the output keys.
:meta private:
"""
_output_keys = [self.output_key]
return _output_keys
[docs] @classmethod
def from_llm(
cls,
llm: BaseLanguageModel,
qa_prompt: BasePromptTemplate = PROMPT,
entity_prompt: BasePromptTemplate = ENTITY_EXTRACTION_PROMPT,
**kwargs: Any,
) -> GraphQAChain:
"""Initialize from LLM."""
|
https://python.langchain.com/en/latest/_modules/langchain/chains/graph_qa/base.html
|
95ad4b231642-1
|
) -> GraphQAChain:
"""Initialize from LLM."""
qa_chain = LLMChain(llm=llm, prompt=qa_prompt)
entity_chain = LLMChain(llm=llm, prompt=entity_prompt)
return cls(
qa_chain=qa_chain,
entity_extraction_chain=entity_chain,
**kwargs,
)
def _call(
self,
inputs: Dict[str, Any],
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Dict[str, str]:
"""Extract entities, look up info and answer question."""
_run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
question = inputs[self.input_key]
entity_string = self.entity_extraction_chain.run(question)
_run_manager.on_text("Entities Extracted:", end="\n", verbose=self.verbose)
_run_manager.on_text(
entity_string, color="green", end="\n", verbose=self.verbose
)
entities = get_entities(entity_string)
context = ""
for entity in entities:
triplets = self.graph.get_entity_knowledge(entity)
context += "\n".join(triplets)
_run_manager.on_text("Full Context:", end="\n", verbose=self.verbose)
_run_manager.on_text(context, color="green", end="\n", verbose=self.verbose)
result = self.qa_chain(
{"question": question, "context": context},
callbacks=_run_manager.get_child(),
)
return {self.output_key: result[self.qa_chain.output_key]}
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/graph_qa/base.html
|
f117dc13457e-0
|
Source code for langchain.chains.llm_bash.base
"""Chain that interprets a prompt and executes bash code to perform bash operations."""
from __future__ import annotations
import logging
import warnings
from typing import Any, Dict, List, Optional
from pydantic import Extra, Field, root_validator
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.manager import CallbackManagerForChainRun
from langchain.chains.base import Chain
from langchain.chains.llm import LLMChain
from langchain.chains.llm_bash.prompt import PROMPT
from langchain.prompts.base import BasePromptTemplate
from langchain.schema import OutputParserException
from langchain.utilities.bash import BashProcess
logger = logging.getLogger(__name__)
[docs]class LLMBashChain(Chain):
"""Chain that interprets a prompt and executes bash code to perform bash operations.
Example:
.. code-block:: python
from langchain import LLMBashChain, OpenAI
llm_bash = LLMBashChain.from_llm(OpenAI())
"""
llm_chain: LLMChain
llm: Optional[BaseLanguageModel] = None
"""[Deprecated] LLM wrapper to use."""
input_key: str = "question" #: :meta private:
output_key: str = "answer" #: :meta private:
prompt: BasePromptTemplate = PROMPT
"""[Deprecated]"""
bash_process: BashProcess = Field(default_factory=BashProcess) #: :meta private:
class Config:
"""Configuration for this pydantic object."""
extra = Extra.forbid
arbitrary_types_allowed = True
@root_validator(pre=True)
def raise_deprecation(cls, values: Dict) -> Dict:
|
https://python.langchain.com/en/latest/_modules/langchain/chains/llm_bash/base.html
|
f117dc13457e-1
|
def raise_deprecation(cls, values: Dict) -> Dict:
if "llm" in values:
warnings.warn(
"Directly instantiating an LLMBashChain with an llm is deprecated. "
"Please instantiate with llm_chain or using the from_llm class method."
)
if "llm_chain" not in values and values["llm"] is not None:
prompt = values.get("prompt", PROMPT)
values["llm_chain"] = LLMChain(llm=values["llm"], prompt=prompt)
return values
@root_validator
def validate_prompt(cls, values: Dict) -> Dict:
if values["llm_chain"].prompt.output_parser is None:
raise ValueError(
"The prompt used by llm_chain is expected to have an output_parser."
)
return values
@property
def input_keys(self) -> List[str]:
"""Expect input key.
:meta private:
"""
return [self.input_key]
@property
def output_keys(self) -> List[str]:
"""Expect output key.
:meta private:
"""
return [self.output_key]
def _call(
self,
inputs: Dict[str, Any],
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Dict[str, str]:
_run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
_run_manager.on_text(inputs[self.input_key], verbose=self.verbose)
t = self.llm_chain.predict(
question=inputs[self.input_key], callbacks=_run_manager.get_child()
)
_run_manager.on_text(t, color="green", verbose=self.verbose)
|
https://python.langchain.com/en/latest/_modules/langchain/chains/llm_bash/base.html
|
f117dc13457e-2
|
)
_run_manager.on_text(t, color="green", verbose=self.verbose)
t = t.strip()
try:
parser = self.llm_chain.prompt.output_parser
command_list = parser.parse(t) # type: ignore[union-attr]
except OutputParserException as e:
_run_manager.on_chain_error(e, verbose=self.verbose)
raise e
if self.verbose:
_run_manager.on_text("\nCode: ", verbose=self.verbose)
_run_manager.on_text(
str(command_list), color="yellow", verbose=self.verbose
)
output = self.bash_process.run(command_list)
_run_manager.on_text("\nAnswer: ", verbose=self.verbose)
_run_manager.on_text(output, color="yellow", verbose=self.verbose)
return {self.output_key: output}
@property
def _chain_type(self) -> str:
return "llm_bash_chain"
[docs] @classmethod
def from_llm(
cls,
llm: BaseLanguageModel,
prompt: BasePromptTemplate = PROMPT,
**kwargs: Any,
) -> LLMBashChain:
llm_chain = LLMChain(llm=llm, prompt=prompt)
return cls(llm_chain=llm_chain, **kwargs)
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/llm_bash/base.html
|
f038495d2c4a-0
|
Source code for langchain.chains.flare.base
from __future__ import annotations
import re
from abc import abstractmethod
from typing import Any, Dict, List, Optional, Sequence, Tuple
import numpy as np
from pydantic import Field
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.manager import (
CallbackManagerForChainRun,
)
from langchain.chains.base import Chain
from langchain.chains.flare.prompts import (
PROMPT,
QUESTION_GENERATOR_PROMPT,
FinishedOutputParser,
)
from langchain.chains.llm import LLMChain
from langchain.llms import OpenAI
from langchain.prompts import BasePromptTemplate
from langchain.schema import BaseRetriever, Generation
class _ResponseChain(LLMChain):
prompt: BasePromptTemplate = PROMPT
@property
def input_keys(self) -> List[str]:
return self.prompt.input_variables
def generate_tokens_and_log_probs(
self,
_input: Dict[str, Any],
*,
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Tuple[Sequence[str], Sequence[float]]:
llm_result = self.generate([_input], run_manager=run_manager)
return self._extract_tokens_and_log_probs(llm_result.generations[0])
@abstractmethod
def _extract_tokens_and_log_probs(
self, generations: List[Generation]
) -> Tuple[Sequence[str], Sequence[float]]:
"""Extract tokens and log probs from response."""
class _OpenAIResponseChain(_ResponseChain):
llm: OpenAI = Field(
default_factory=lambda: OpenAI(
max_tokens=32, model_kwargs={"logprobs": 1}, temperature=0
)
|
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|
f038495d2c4a-1
|
)
)
def _extract_tokens_and_log_probs(
self, generations: List[Generation]
) -> Tuple[Sequence[str], Sequence[float]]:
tokens = []
log_probs = []
for gen in generations:
if gen.generation_info is None:
raise ValueError
tokens.extend(gen.generation_info["logprobs"]["tokens"])
log_probs.extend(gen.generation_info["logprobs"]["token_logprobs"])
return tokens, log_probs
class QuestionGeneratorChain(LLMChain):
prompt: BasePromptTemplate = QUESTION_GENERATOR_PROMPT
@property
def input_keys(self) -> List[str]:
return ["user_input", "context", "response"]
def _low_confidence_spans(
tokens: Sequence[str],
log_probs: Sequence[float],
min_prob: float,
min_token_gap: int,
num_pad_tokens: int,
) -> List[str]:
_low_idx = np.where(np.exp(log_probs) < min_prob)[0]
low_idx = [i for i in _low_idx if re.search(r"\w", tokens[i])]
if len(low_idx) == 0:
return []
spans = [[low_idx[0], low_idx[0] + num_pad_tokens + 1]]
for i, idx in enumerate(low_idx[1:]):
end = idx + num_pad_tokens + 1
if idx - low_idx[i] < min_token_gap:
spans[-1][1] = end
else:
spans.append([idx, end])
return ["".join(tokens[start:end]) for start, end in spans]
[docs]class FlareChain(Chain):
question_generator_chain: QuestionGeneratorChain
|
https://python.langchain.com/en/latest/_modules/langchain/chains/flare/base.html
|
f038495d2c4a-2
|
[docs]class FlareChain(Chain):
question_generator_chain: QuestionGeneratorChain
response_chain: _ResponseChain = Field(default_factory=_OpenAIResponseChain)
output_parser: FinishedOutputParser = Field(default_factory=FinishedOutputParser)
retriever: BaseRetriever
min_prob: float = 0.2
min_token_gap: int = 5
num_pad_tokens: int = 2
max_iter: int = 10
start_with_retrieval: bool = True
@property
def input_keys(self) -> List[str]:
return ["user_input"]
@property
def output_keys(self) -> List[str]:
return ["response"]
def _do_generation(
self,
questions: List[str],
user_input: str,
response: str,
_run_manager: CallbackManagerForChainRun,
) -> Tuple[str, bool]:
callbacks = _run_manager.get_child()
docs = []
for question in questions:
docs.extend(self.retriever.get_relevant_documents(question))
context = "\n\n".join(d.page_content for d in docs)
result = self.response_chain.predict(
user_input=user_input,
context=context,
response=response,
callbacks=callbacks,
)
marginal, finished = self.output_parser.parse(result)
return marginal, finished
def _do_retrieval(
self,
low_confidence_spans: List[str],
_run_manager: CallbackManagerForChainRun,
user_input: str,
response: str,
initial_response: str,
) -> Tuple[str, bool]:
question_gen_inputs = [
{
"user_input": user_input,
|
https://python.langchain.com/en/latest/_modules/langchain/chains/flare/base.html
|
f038495d2c4a-3
|
question_gen_inputs = [
{
"user_input": user_input,
"current_response": initial_response,
"uncertain_span": span,
}
for span in low_confidence_spans
]
callbacks = _run_manager.get_child()
question_gen_outputs = self.question_generator_chain.apply(
question_gen_inputs, callbacks=callbacks
)
questions = [
output[self.question_generator_chain.output_keys[0]]
for output in question_gen_outputs
]
_run_manager.on_text(
f"Generated Questions: {questions}", color="yellow", end="\n"
)
return self._do_generation(questions, user_input, response, _run_manager)
def _call(
self,
inputs: Dict[str, Any],
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Dict[str, Any]:
_run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
user_input = inputs[self.input_keys[0]]
response = ""
for i in range(self.max_iter):
_run_manager.on_text(
f"Current Response: {response}", color="blue", end="\n"
)
_input = {"user_input": user_input, "context": "", "response": response}
tokens, log_probs = self.response_chain.generate_tokens_and_log_probs(
_input, run_manager=_run_manager
)
low_confidence_spans = _low_confidence_spans(
tokens,
log_probs,
self.min_prob,
self.min_token_gap,
self.num_pad_tokens,
)
initial_response = response.strip() + " " + "".join(tokens)
|
https://python.langchain.com/en/latest/_modules/langchain/chains/flare/base.html
|
f038495d2c4a-4
|
)
initial_response = response.strip() + " " + "".join(tokens)
if not low_confidence_spans:
response = initial_response
final_response, finished = self.output_parser.parse(response)
if finished:
return {self.output_keys[0]: final_response}
continue
marginal, finished = self._do_retrieval(
low_confidence_spans,
_run_manager,
user_input,
response,
initial_response,
)
response = response.strip() + " " + marginal
if finished:
break
return {self.output_keys[0]: response}
[docs] @classmethod
def from_llm(
cls, llm: BaseLanguageModel, max_generation_len: int = 32, **kwargs: Any
) -> FlareChain:
question_gen_chain = QuestionGeneratorChain(llm=llm)
response_llm = OpenAI(
max_tokens=max_generation_len, model_kwargs={"logprobs": 1}, temperature=0
)
response_chain = _OpenAIResponseChain(llm=response_llm)
return cls(
question_generator_chain=question_gen_chain,
response_chain=response_chain,
**kwargs,
)
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/flare/base.html
|
224bbf5660c3-0
|
Source code for langchain.chains.qa_with_sources.retrieval
"""Question-answering with sources over an index."""
from typing import Any, Dict, List
from pydantic import Field
from langchain.chains.combine_documents.stuff import StuffDocumentsChain
from langchain.chains.qa_with_sources.base import BaseQAWithSourcesChain
from langchain.docstore.document import Document
from langchain.schema import BaseRetriever
[docs]class RetrievalQAWithSourcesChain(BaseQAWithSourcesChain):
"""Question-answering with sources over an index."""
retriever: BaseRetriever = Field(exclude=True)
"""Index to connect to."""
reduce_k_below_max_tokens: bool = False
"""Reduce the number of results to return from store based on tokens limit"""
max_tokens_limit: int = 3375
"""Restrict the docs to return from store based on tokens,
enforced only for StuffDocumentChain and if reduce_k_below_max_tokens is to true"""
def _reduce_tokens_below_limit(self, docs: List[Document]) -> List[Document]:
num_docs = len(docs)
if self.reduce_k_below_max_tokens and isinstance(
self.combine_documents_chain, StuffDocumentsChain
):
tokens = [
self.combine_documents_chain.llm_chain.llm.get_num_tokens(
doc.page_content
)
for doc in docs
]
token_count = sum(tokens[:num_docs])
while token_count > self.max_tokens_limit:
num_docs -= 1
token_count -= tokens[num_docs]
return docs[:num_docs]
def _get_docs(self, inputs: Dict[str, Any]) -> List[Document]:
question = inputs[self.question_key]
docs = self.retriever.get_relevant_documents(question)
|
https://python.langchain.com/en/latest/_modules/langchain/chains/qa_with_sources/retrieval.html
|
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|
docs = self.retriever.get_relevant_documents(question)
return self._reduce_tokens_below_limit(docs)
async def _aget_docs(self, inputs: Dict[str, Any]) -> List[Document]:
question = inputs[self.question_key]
docs = await self.retriever.aget_relevant_documents(question)
return self._reduce_tokens_below_limit(docs)
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/qa_with_sources/retrieval.html
|
071aaa38084f-0
|
Source code for langchain.chains.qa_with_sources.base
"""Question answering with sources over documents."""
from __future__ import annotations
import re
from abc import ABC, abstractmethod
from typing import Any, Dict, List, Optional
from pydantic import Extra, root_validator
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.manager import (
AsyncCallbackManagerForChainRun,
CallbackManagerForChainRun,
)
from langchain.chains.base import Chain
from langchain.chains.combine_documents.base import BaseCombineDocumentsChain
from langchain.chains.combine_documents.map_reduce import MapReduceDocumentsChain
from langchain.chains.combine_documents.stuff import StuffDocumentsChain
from langchain.chains.llm import LLMChain
from langchain.chains.qa_with_sources.loading import load_qa_with_sources_chain
from langchain.chains.qa_with_sources.map_reduce_prompt import (
COMBINE_PROMPT,
EXAMPLE_PROMPT,
QUESTION_PROMPT,
)
from langchain.docstore.document import Document
from langchain.prompts.base import BasePromptTemplate
class BaseQAWithSourcesChain(Chain, ABC):
"""Question answering with sources over documents."""
combine_documents_chain: BaseCombineDocumentsChain
"""Chain to use to combine documents."""
question_key: str = "question" #: :meta private:
input_docs_key: str = "docs" #: :meta private:
answer_key: str = "answer" #: :meta private:
sources_answer_key: str = "sources" #: :meta private:
return_source_documents: bool = False
"""Return the source documents."""
@classmethod
def from_llm(
cls,
llm: BaseLanguageModel,
document_prompt: BasePromptTemplate = EXAMPLE_PROMPT,
|
https://python.langchain.com/en/latest/_modules/langchain/chains/qa_with_sources/base.html
|
071aaa38084f-1
|
document_prompt: BasePromptTemplate = EXAMPLE_PROMPT,
question_prompt: BasePromptTemplate = QUESTION_PROMPT,
combine_prompt: BasePromptTemplate = COMBINE_PROMPT,
**kwargs: Any,
) -> BaseQAWithSourcesChain:
"""Construct the chain from an LLM."""
llm_question_chain = LLMChain(llm=llm, prompt=question_prompt)
llm_combine_chain = LLMChain(llm=llm, prompt=combine_prompt)
combine_results_chain = StuffDocumentsChain(
llm_chain=llm_combine_chain,
document_prompt=document_prompt,
document_variable_name="summaries",
)
combine_document_chain = MapReduceDocumentsChain(
llm_chain=llm_question_chain,
combine_document_chain=combine_results_chain,
document_variable_name="context",
)
return cls(
combine_documents_chain=combine_document_chain,
**kwargs,
)
@classmethod
def from_chain_type(
cls,
llm: BaseLanguageModel,
chain_type: str = "stuff",
chain_type_kwargs: Optional[dict] = None,
**kwargs: Any,
) -> BaseQAWithSourcesChain:
"""Load chain from chain type."""
_chain_kwargs = chain_type_kwargs or {}
combine_document_chain = load_qa_with_sources_chain(
llm, chain_type=chain_type, **_chain_kwargs
)
return cls(combine_documents_chain=combine_document_chain, **kwargs)
class Config:
"""Configuration for this pydantic object."""
extra = Extra.forbid
arbitrary_types_allowed = True
@property
def input_keys(self) -> List[str]:
"""Expect input key.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/qa_with_sources/base.html
|
071aaa38084f-2
|
def input_keys(self) -> List[str]:
"""Expect input key.
:meta private:
"""
return [self.question_key]
@property
def output_keys(self) -> List[str]:
"""Return output key.
:meta private:
"""
_output_keys = [self.answer_key, self.sources_answer_key]
if self.return_source_documents:
_output_keys = _output_keys + ["source_documents"]
return _output_keys
@root_validator(pre=True)
def validate_naming(cls, values: Dict) -> Dict:
"""Fix backwards compatability in naming."""
if "combine_document_chain" in values:
values["combine_documents_chain"] = values.pop("combine_document_chain")
return values
@abstractmethod
def _get_docs(self, inputs: Dict[str, Any]) -> List[Document]:
"""Get docs to run questioning over."""
def _call(
self,
inputs: Dict[str, Any],
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Dict[str, str]:
_run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
docs = self._get_docs(inputs)
answer = self.combine_documents_chain.run(
input_documents=docs, callbacks=_run_manager.get_child(), **inputs
)
if re.search(r"SOURCES:\s", answer):
answer, sources = re.split(r"SOURCES:\s", answer)
else:
sources = ""
result: Dict[str, Any] = {
self.answer_key: answer,
self.sources_answer_key: sources,
}
if self.return_source_documents:
result["source_documents"] = docs
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}
if self.return_source_documents:
result["source_documents"] = docs
return result
@abstractmethod
async def _aget_docs(self, inputs: Dict[str, Any]) -> List[Document]:
"""Get docs to run questioning over."""
async def _acall(
self,
inputs: Dict[str, Any],
run_manager: Optional[AsyncCallbackManagerForChainRun] = None,
) -> Dict[str, Any]:
_run_manager = run_manager or AsyncCallbackManagerForChainRun.get_noop_manager()
docs = await self._aget_docs(inputs)
answer = await self.combine_documents_chain.arun(
input_documents=docs, callbacks=_run_manager.get_child(), **inputs
)
if re.search(r"SOURCES:\s", answer):
answer, sources = re.split(r"SOURCES:\s", answer)
else:
sources = ""
result: Dict[str, Any] = {
self.answer_key: answer,
self.sources_answer_key: sources,
}
if self.return_source_documents:
result["source_documents"] = docs
return result
[docs]class QAWithSourcesChain(BaseQAWithSourcesChain):
"""Question answering with sources over documents."""
input_docs_key: str = "docs" #: :meta private:
@property
def input_keys(self) -> List[str]:
"""Expect input key.
:meta private:
"""
return [self.input_docs_key, self.question_key]
def _get_docs(self, inputs: Dict[str, Any]) -> List[Document]:
return inputs.pop(self.input_docs_key)
async def _aget_docs(self, inputs: Dict[str, Any]) -> List[Document]:
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return inputs.pop(self.input_docs_key)
@property
def _chain_type(self) -> str:
return "qa_with_sources_chain"
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/qa_with_sources/base.html
|
1c03f3c0d1a7-0
|
Source code for langchain.chains.qa_with_sources.vector_db
"""Question-answering with sources over a vector database."""
import warnings
from typing import Any, Dict, List
from pydantic import Field, root_validator
from langchain.chains.combine_documents.stuff import StuffDocumentsChain
from langchain.chains.qa_with_sources.base import BaseQAWithSourcesChain
from langchain.docstore.document import Document
from langchain.vectorstores.base import VectorStore
[docs]class VectorDBQAWithSourcesChain(BaseQAWithSourcesChain):
"""Question-answering with sources over a vector database."""
vectorstore: VectorStore = Field(exclude=True)
"""Vector Database to connect to."""
k: int = 4
"""Number of results to return from store"""
reduce_k_below_max_tokens: bool = False
"""Reduce the number of results to return from store based on tokens limit"""
max_tokens_limit: int = 3375
"""Restrict the docs to return from store based on tokens,
enforced only for StuffDocumentChain and if reduce_k_below_max_tokens is to true"""
search_kwargs: Dict[str, Any] = Field(default_factory=dict)
"""Extra search args."""
def _reduce_tokens_below_limit(self, docs: List[Document]) -> List[Document]:
num_docs = len(docs)
if self.reduce_k_below_max_tokens and isinstance(
self.combine_documents_chain, StuffDocumentsChain
):
tokens = [
self.combine_documents_chain.llm_chain.llm.get_num_tokens(
doc.page_content
)
for doc in docs
]
token_count = sum(tokens[:num_docs])
while token_count > self.max_tokens_limit:
num_docs -= 1
token_count -= tokens[num_docs]
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|
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|
num_docs -= 1
token_count -= tokens[num_docs]
return docs[:num_docs]
def _get_docs(self, inputs: Dict[str, Any]) -> List[Document]:
question = inputs[self.question_key]
docs = self.vectorstore.similarity_search(
question, k=self.k, **self.search_kwargs
)
return self._reduce_tokens_below_limit(docs)
async def _aget_docs(self, inputs: Dict[str, Any]) -> List[Document]:
raise NotImplementedError("VectorDBQAWithSourcesChain does not support async")
@root_validator()
def raise_deprecation(cls, values: Dict) -> Dict:
warnings.warn(
"`VectorDBQAWithSourcesChain` is deprecated - "
"please use `from langchain.chains import RetrievalQAWithSourcesChain`"
)
return values
@property
def _chain_type(self) -> str:
return "vector_db_qa_with_sources_chain"
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/qa_with_sources/vector_db.html
|
e8430918a5e6-0
|
Source code for langchain.chains.conversation.base
"""Chain that carries on a conversation and calls an LLM."""
from typing import Dict, List
from pydantic import Extra, Field, root_validator
from langchain.chains.conversation.prompt import PROMPT
from langchain.chains.llm import LLMChain
from langchain.memory.buffer import ConversationBufferMemory
from langchain.prompts.base import BasePromptTemplate
from langchain.schema import BaseMemory
[docs]class ConversationChain(LLMChain):
"""Chain to have a conversation and load context from memory.
Example:
.. code-block:: python
from langchain import ConversationChain, OpenAI
conversation = ConversationChain(llm=OpenAI())
"""
memory: BaseMemory = Field(default_factory=ConversationBufferMemory)
"""Default memory store."""
prompt: BasePromptTemplate = PROMPT
"""Default conversation prompt to use."""
input_key: str = "input" #: :meta private:
output_key: str = "response" #: :meta private:
class Config:
"""Configuration for this pydantic object."""
extra = Extra.forbid
arbitrary_types_allowed = True
@property
def input_keys(self) -> List[str]:
"""Use this since so some prompt vars come from history."""
return [self.input_key]
@root_validator()
def validate_prompt_input_variables(cls, values: Dict) -> Dict:
"""Validate that prompt input variables are consistent."""
memory_keys = values["memory"].memory_variables
input_key = values["input_key"]
if input_key in memory_keys:
raise ValueError(
f"The input key {input_key} was also found in the memory keys "
|
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|
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|
f"The input key {input_key} was also found in the memory keys "
f"({memory_keys}) - please provide keys that don't overlap."
)
prompt_variables = values["prompt"].input_variables
expected_keys = memory_keys + [input_key]
if set(expected_keys) != set(prompt_variables):
raise ValueError(
"Got unexpected prompt input variables. The prompt expects "
f"{prompt_variables}, but got {memory_keys} as inputs from "
f"memory, and {input_key} as the normal input key."
)
return values
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/conversation/base.html
|
06d6def9b835-0
|
Source code for langchain.chains.hyde.base
"""Hypothetical Document Embeddings.
https://arxiv.org/abs/2212.10496
"""
from __future__ import annotations
from typing import Any, Dict, List, Optional
import numpy as np
from pydantic import Extra
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.manager import CallbackManagerForChainRun
from langchain.chains.base import Chain
from langchain.chains.hyde.prompts import PROMPT_MAP
from langchain.chains.llm import LLMChain
from langchain.embeddings.base import Embeddings
[docs]class HypotheticalDocumentEmbedder(Chain, Embeddings):
"""Generate hypothetical document for query, and then embed that.
Based on https://arxiv.org/abs/2212.10496
"""
base_embeddings: Embeddings
llm_chain: LLMChain
class Config:
"""Configuration for this pydantic object."""
extra = Extra.forbid
arbitrary_types_allowed = True
@property
def input_keys(self) -> List[str]:
"""Input keys for Hyde's LLM chain."""
return self.llm_chain.input_keys
@property
def output_keys(self) -> List[str]:
"""Output keys for Hyde's LLM chain."""
return self.llm_chain.output_keys
[docs] def embed_documents(self, texts: List[str]) -> List[List[float]]:
"""Call the base embeddings."""
return self.base_embeddings.embed_documents(texts)
[docs] def combine_embeddings(self, embeddings: List[List[float]]) -> List[float]:
"""Combine embeddings into final embeddings."""
return list(np.array(embeddings).mean(axis=0))
|
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|
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|
return list(np.array(embeddings).mean(axis=0))
[docs] def embed_query(self, text: str) -> List[float]:
"""Generate a hypothetical document and embedded it."""
var_name = self.llm_chain.input_keys[0]
result = self.llm_chain.generate([{var_name: text}])
documents = [generation.text for generation in result.generations[0]]
embeddings = self.embed_documents(documents)
return self.combine_embeddings(embeddings)
def _call(
self,
inputs: Dict[str, Any],
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Dict[str, str]:
"""Call the internal llm chain."""
_run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
return self.llm_chain(inputs, callbacks=_run_manager.get_child())
[docs] @classmethod
def from_llm(
cls,
llm: BaseLanguageModel,
base_embeddings: Embeddings,
prompt_key: str,
**kwargs: Any,
) -> HypotheticalDocumentEmbedder:
"""Load and use LLMChain for a specific prompt key."""
prompt = PROMPT_MAP[prompt_key]
llm_chain = LLMChain(llm=llm, prompt=prompt)
return cls(base_embeddings=base_embeddings, llm_chain=llm_chain, **kwargs)
@property
def _chain_type(self) -> str:
return "hyde_chain"
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/hyde/base.html
|
040ea2ff8049-0
|
Source code for langchain.chains.qa_generation.base
from __future__ import annotations
import json
from typing import Any, Dict, List, Optional
from pydantic import Field
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.manager import CallbackManagerForChainRun
from langchain.chains.base import Chain
from langchain.chains.llm import LLMChain
from langchain.chains.qa_generation.prompt import PROMPT_SELECTOR
from langchain.prompts.base import BasePromptTemplate
from langchain.text_splitter import RecursiveCharacterTextSplitter, TextSplitter
[docs]class QAGenerationChain(Chain):
llm_chain: LLMChain
text_splitter: TextSplitter = Field(
default=RecursiveCharacterTextSplitter(chunk_overlap=500)
)
input_key: str = "text"
output_key: str = "questions"
k: Optional[int] = None
[docs] @classmethod
def from_llm(
cls,
llm: BaseLanguageModel,
prompt: Optional[BasePromptTemplate] = None,
**kwargs: Any,
) -> QAGenerationChain:
_prompt = prompt or PROMPT_SELECTOR.get_prompt(llm)
chain = LLMChain(llm=llm, prompt=_prompt)
return cls(llm_chain=chain, **kwargs)
@property
def _chain_type(self) -> str:
raise NotImplementedError
@property
def input_keys(self) -> List[str]:
return [self.input_key]
@property
def output_keys(self) -> List[str]:
return [self.output_key]
def _call(
self,
inputs: Dict[str, Any],
|
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|
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|
def _call(
self,
inputs: Dict[str, Any],
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Dict[str, List]:
docs = self.text_splitter.create_documents([inputs[self.input_key]])
results = self.llm_chain.generate(
[{"text": d.page_content} for d in docs], run_manager=run_manager
)
qa = [json.loads(res[0].text) for res in results.generations]
return {self.output_key: qa}
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/qa_generation/base.html
|
c8383f36b052-0
|
Source code for langchain.chains.combine_documents.base
"""Base interface for chains combining documents."""
from abc import ABC, abstractmethod
from typing import Any, Dict, List, Optional, Tuple
from pydantic import Field
from langchain.callbacks.manager import (
AsyncCallbackManagerForChainRun,
CallbackManagerForChainRun,
)
from langchain.chains.base import Chain
from langchain.docstore.document import Document
from langchain.prompts.base import BasePromptTemplate
from langchain.text_splitter import RecursiveCharacterTextSplitter, TextSplitter
def format_document(doc: Document, prompt: BasePromptTemplate) -> str:
"""Format a document into a string based on a prompt template."""
base_info = {"page_content": doc.page_content}
base_info.update(doc.metadata)
missing_metadata = set(prompt.input_variables).difference(base_info)
if len(missing_metadata) > 0:
required_metadata = [
iv for iv in prompt.input_variables if iv != "page_content"
]
raise ValueError(
f"Document prompt requires documents to have metadata variables: "
f"{required_metadata}. Received document with missing metadata: "
f"{list(missing_metadata)}."
)
document_info = {k: base_info[k] for k in prompt.input_variables}
return prompt.format(**document_info)
class BaseCombineDocumentsChain(Chain, ABC):
"""Base interface for chains combining documents."""
input_key: str = "input_documents" #: :meta private:
output_key: str = "output_text" #: :meta private:
@property
def input_keys(self) -> List[str]:
"""Expect input key.
:meta private:
"""
return [self.input_key]
@property
|
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|
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|
"""
return [self.input_key]
@property
def output_keys(self) -> List[str]:
"""Return output key.
:meta private:
"""
return [self.output_key]
def prompt_length(self, docs: List[Document], **kwargs: Any) -> Optional[int]:
"""Return the prompt length given the documents passed in.
Returns None if the method does not depend on the prompt length.
"""
return None
@abstractmethod
def combine_docs(self, docs: List[Document], **kwargs: Any) -> Tuple[str, dict]:
"""Combine documents into a single string."""
@abstractmethod
async def acombine_docs(
self, docs: List[Document], **kwargs: Any
) -> Tuple[str, dict]:
"""Combine documents into a single string asynchronously."""
def _call(
self,
inputs: Dict[str, List[Document]],
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Dict[str, str]:
_run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
docs = inputs[self.input_key]
# Other keys are assumed to be needed for LLM prediction
other_keys = {k: v for k, v in inputs.items() if k != self.input_key}
output, extra_return_dict = self.combine_docs(
docs, callbacks=_run_manager.get_child(), **other_keys
)
extra_return_dict[self.output_key] = output
return extra_return_dict
async def _acall(
self,
inputs: Dict[str, List[Document]],
run_manager: Optional[AsyncCallbackManagerForChainRun] = None,
) -> Dict[str, str]:
|
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|
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|
) -> Dict[str, str]:
_run_manager = run_manager or AsyncCallbackManagerForChainRun.get_noop_manager()
docs = inputs[self.input_key]
# Other keys are assumed to be needed for LLM prediction
other_keys = {k: v for k, v in inputs.items() if k != self.input_key}
output, extra_return_dict = await self.acombine_docs(
docs, callbacks=_run_manager.get_child(), **other_keys
)
extra_return_dict[self.output_key] = output
return extra_return_dict
[docs]class AnalyzeDocumentChain(Chain):
"""Chain that splits documents, then analyzes it in pieces."""
input_key: str = "input_document" #: :meta private:
text_splitter: TextSplitter = Field(default_factory=RecursiveCharacterTextSplitter)
combine_docs_chain: BaseCombineDocumentsChain
@property
def input_keys(self) -> List[str]:
"""Expect input key.
:meta private:
"""
return [self.input_key]
@property
def output_keys(self) -> List[str]:
"""Return output key.
:meta private:
"""
return self.combine_docs_chain.output_keys
def _call(
self,
inputs: Dict[str, str],
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Dict[str, str]:
_run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
document = inputs[self.input_key]
docs = self.text_splitter.create_documents([document])
# Other keys are assumed to be needed for LLM prediction
other_keys: Dict = {k: v for k, v in inputs.items() if k != self.input_key}
|
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|
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|
other_keys[self.combine_docs_chain.input_key] = docs
return self.combine_docs_chain(
other_keys, return_only_outputs=True, callbacks=_run_manager.get_child()
)
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/combine_documents/base.html
|
f13ac6015709-0
|
Source code for langchain.chains.pal.base
"""Implements Program-Aided Language Models.
As in https://arxiv.org/pdf/2211.10435.pdf.
"""
from __future__ import annotations
import warnings
from typing import Any, Dict, List, Optional
from pydantic import Extra, root_validator
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.manager import CallbackManagerForChainRun
from langchain.chains.base import Chain
from langchain.chains.llm import LLMChain
from langchain.chains.pal.colored_object_prompt import COLORED_OBJECT_PROMPT
from langchain.chains.pal.math_prompt import MATH_PROMPT
from langchain.prompts.base import BasePromptTemplate
from langchain.utilities import PythonREPL
[docs]class PALChain(Chain):
"""Implements Program-Aided Language Models."""
llm_chain: LLMChain
llm: Optional[BaseLanguageModel] = None
"""[Deprecated]"""
prompt: BasePromptTemplate = MATH_PROMPT
"""[Deprecated]"""
stop: str = "\n\n"
get_answer_expr: str = "print(solution())"
python_globals: Optional[Dict[str, Any]] = None
python_locals: Optional[Dict[str, Any]] = None
output_key: str = "result" #: :meta private:
return_intermediate_steps: bool = False
class Config:
"""Configuration for this pydantic object."""
extra = Extra.forbid
arbitrary_types_allowed = True
@root_validator(pre=True)
def raise_deprecation(cls, values: Dict) -> Dict:
if "llm" in values:
warnings.warn(
"Directly instantiating an PALChain with an llm is deprecated. "
|
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|
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|
"Directly instantiating an PALChain with an llm is deprecated. "
"Please instantiate with llm_chain argument or using the one of "
"the class method constructors from_math_prompt, "
"from_colored_object_prompt."
)
if "llm_chain" not in values and values["llm"] is not None:
values["llm_chain"] = LLMChain(llm=values["llm"], prompt=MATH_PROMPT)
return values
@property
def input_keys(self) -> List[str]:
"""Return the singular input key.
:meta private:
"""
return self.prompt.input_variables
@property
def output_keys(self) -> List[str]:
"""Return the singular output key.
:meta private:
"""
if not self.return_intermediate_steps:
return [self.output_key]
else:
return [self.output_key, "intermediate_steps"]
def _call(
self,
inputs: Dict[str, Any],
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Dict[str, str]:
_run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
code = self.llm_chain.predict(
stop=[self.stop], callbacks=_run_manager.get_child(), **inputs
)
_run_manager.on_text(code, color="green", end="\n", verbose=self.verbose)
repl = PythonREPL(_globals=self.python_globals, _locals=self.python_locals)
res = repl.run(code + f"\n{self.get_answer_expr}")
output = {self.output_key: res.strip()}
if self.return_intermediate_steps:
output["intermediate_steps"] = code
|
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|
f13ac6015709-2
|
if self.return_intermediate_steps:
output["intermediate_steps"] = code
return output
[docs] @classmethod
def from_math_prompt(cls, llm: BaseLanguageModel, **kwargs: Any) -> PALChain:
"""Load PAL from math prompt."""
llm_chain = LLMChain(llm=llm, prompt=MATH_PROMPT)
return cls(
llm_chain=llm_chain,
stop="\n\n",
get_answer_expr="print(solution())",
**kwargs,
)
[docs] @classmethod
def from_colored_object_prompt(
cls, llm: BaseLanguageModel, **kwargs: Any
) -> PALChain:
"""Load PAL from colored object prompt."""
llm_chain = LLMChain(llm=llm, prompt=COLORED_OBJECT_PROMPT)
return cls(
llm_chain=llm_chain,
stop="\n\n\n",
get_answer_expr="print(answer)",
**kwargs,
)
@property
def _chain_type(self) -> str:
return "pal_chain"
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/pal/base.html
|
91bbded0bead-0
|
Source code for langchain.chains.retrieval_qa.base
"""Chain for question-answering against a vector database."""
from __future__ import annotations
import warnings
from abc import abstractmethod
from typing import Any, Dict, List, Optional
from pydantic import Extra, Field, root_validator
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.manager import (
AsyncCallbackManagerForChainRun,
CallbackManagerForChainRun,
)
from langchain.chains.base import Chain
from langchain.chains.combine_documents.base import BaseCombineDocumentsChain
from langchain.chains.combine_documents.stuff import StuffDocumentsChain
from langchain.chains.llm import LLMChain
from langchain.chains.question_answering import load_qa_chain
from langchain.chains.question_answering.stuff_prompt import PROMPT_SELECTOR
from langchain.prompts import PromptTemplate
from langchain.schema import BaseRetriever, Document
from langchain.vectorstores.base import VectorStore
class BaseRetrievalQA(Chain):
combine_documents_chain: BaseCombineDocumentsChain
"""Chain to use to combine the documents."""
input_key: str = "query" #: :meta private:
output_key: str = "result" #: :meta private:
return_source_documents: bool = False
"""Return the source documents."""
class Config:
"""Configuration for this pydantic object."""
extra = Extra.forbid
arbitrary_types_allowed = True
allow_population_by_field_name = True
@property
def input_keys(self) -> List[str]:
"""Return the input keys.
:meta private:
"""
return [self.input_key]
@property
def output_keys(self) -> List[str]:
"""Return the output keys.
|
https://python.langchain.com/en/latest/_modules/langchain/chains/retrieval_qa/base.html
|
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|
def output_keys(self) -> List[str]:
"""Return the output keys.
:meta private:
"""
_output_keys = [self.output_key]
if self.return_source_documents:
_output_keys = _output_keys + ["source_documents"]
return _output_keys
@classmethod
def from_llm(
cls,
llm: BaseLanguageModel,
prompt: Optional[PromptTemplate] = None,
**kwargs: Any,
) -> BaseRetrievalQA:
"""Initialize from LLM."""
_prompt = prompt or PROMPT_SELECTOR.get_prompt(llm)
llm_chain = LLMChain(llm=llm, prompt=_prompt)
document_prompt = PromptTemplate(
input_variables=["page_content"], template="Context:\n{page_content}"
)
combine_documents_chain = StuffDocumentsChain(
llm_chain=llm_chain,
document_variable_name="context",
document_prompt=document_prompt,
)
return cls(combine_documents_chain=combine_documents_chain, **kwargs)
@classmethod
def from_chain_type(
cls,
llm: BaseLanguageModel,
chain_type: str = "stuff",
chain_type_kwargs: Optional[dict] = None,
**kwargs: Any,
) -> BaseRetrievalQA:
"""Load chain from chain type."""
_chain_type_kwargs = chain_type_kwargs or {}
combine_documents_chain = load_qa_chain(
llm, chain_type=chain_type, **_chain_type_kwargs
)
return cls(combine_documents_chain=combine_documents_chain, **kwargs)
@abstractmethod
def _get_docs(self, question: str) -> List[Document]:
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def _get_docs(self, question: str) -> List[Document]:
"""Get documents to do question answering over."""
def _call(
self,
inputs: Dict[str, Any],
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Dict[str, Any]:
"""Run get_relevant_text and llm on input query.
If chain has 'return_source_documents' as 'True', returns
the retrieved documents as well under the key 'source_documents'.
Example:
.. code-block:: python
res = indexqa({'query': 'This is my query'})
answer, docs = res['result'], res['source_documents']
"""
_run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
question = inputs[self.input_key]
docs = self._get_docs(question)
answer = self.combine_documents_chain.run(
input_documents=docs, question=question, callbacks=_run_manager.get_child()
)
if self.return_source_documents:
return {self.output_key: answer, "source_documents": docs}
else:
return {self.output_key: answer}
@abstractmethod
async def _aget_docs(self, question: str) -> List[Document]:
"""Get documents to do question answering over."""
async def _acall(
self,
inputs: Dict[str, Any],
run_manager: Optional[AsyncCallbackManagerForChainRun] = None,
) -> Dict[str, Any]:
"""Run get_relevant_text and llm on input query.
If chain has 'return_source_documents' as 'True', returns
the retrieved documents as well under the key 'source_documents'.
Example:
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the retrieved documents as well under the key 'source_documents'.
Example:
.. code-block:: python
res = indexqa({'query': 'This is my query'})
answer, docs = res['result'], res['source_documents']
"""
_run_manager = run_manager or AsyncCallbackManagerForChainRun.get_noop_manager()
question = inputs[self.input_key]
docs = await self._aget_docs(question)
answer = await self.combine_documents_chain.arun(
input_documents=docs, question=question, callbacks=_run_manager.get_child()
)
if self.return_source_documents:
return {self.output_key: answer, "source_documents": docs}
else:
return {self.output_key: answer}
[docs]class RetrievalQA(BaseRetrievalQA):
"""Chain for question-answering against an index.
Example:
.. code-block:: python
from langchain.llms import OpenAI
from langchain.chains import RetrievalQA
from langchain.faiss import FAISS
from langchain.vectorstores.base import VectorStoreRetriever
retriever = VectorStoreRetriever(vectorstore=FAISS(...))
retrievalQA = RetrievalQA.from_llm(llm=OpenAI(), retriever=retriever)
"""
retriever: BaseRetriever = Field(exclude=True)
def _get_docs(self, question: str) -> List[Document]:
return self.retriever.get_relevant_documents(question)
async def _aget_docs(self, question: str) -> List[Document]:
return await self.retriever.aget_relevant_documents(question)
[docs]class VectorDBQA(BaseRetrievalQA):
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[docs]class VectorDBQA(BaseRetrievalQA):
"""Chain for question-answering against a vector database."""
vectorstore: VectorStore = Field(exclude=True, alias="vectorstore")
"""Vector Database to connect to."""
k: int = 4
"""Number of documents to query for."""
search_type: str = "similarity"
"""Search type to use over vectorstore. `similarity` or `mmr`."""
search_kwargs: Dict[str, Any] = Field(default_factory=dict)
"""Extra search args."""
@root_validator()
def raise_deprecation(cls, values: Dict) -> Dict:
warnings.warn(
"`VectorDBQA` is deprecated - "
"please use `from langchain.chains import RetrievalQA`"
)
return values
@root_validator()
def validate_search_type(cls, values: Dict) -> Dict:
"""Validate search type."""
if "search_type" in values:
search_type = values["search_type"]
if search_type not in ("similarity", "mmr"):
raise ValueError(f"search_type of {search_type} not allowed.")
return values
def _get_docs(self, question: str) -> List[Document]:
if self.search_type == "similarity":
docs = self.vectorstore.similarity_search(
question, k=self.k, **self.search_kwargs
)
elif self.search_type == "mmr":
docs = self.vectorstore.max_marginal_relevance_search(
question, k=self.k, **self.search_kwargs
)
else:
raise ValueError(f"search_type of {self.search_type} not allowed.")
return docs
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return docs
async def _aget_docs(self, question: str) -> List[Document]:
raise NotImplementedError("VectorDBQA does not support async")
@property
def _chain_type(self) -> str:
"""Return the chain type."""
return "vector_db_qa"
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
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https://python.langchain.com/en/latest/_modules/langchain/chains/retrieval_qa/base.html
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Source code for langchain.memory.buffer_window
from typing import Any, Dict, List
from langchain.memory.chat_memory import BaseChatMemory
from langchain.schema import BaseMessage, get_buffer_string
[docs]class ConversationBufferWindowMemory(BaseChatMemory):
"""Buffer for storing conversation memory."""
human_prefix: str = "Human"
ai_prefix: str = "AI"
memory_key: str = "history" #: :meta private:
k: int = 5
@property
def buffer(self) -> List[BaseMessage]:
"""String buffer of memory."""
return self.chat_memory.messages
@property
def memory_variables(self) -> List[str]:
"""Will always return list of memory variables.
:meta private:
"""
return [self.memory_key]
[docs] def load_memory_variables(self, inputs: Dict[str, Any]) -> Dict[str, str]:
"""Return history buffer."""
buffer: Any = self.buffer[-self.k * 2 :] if self.k > 0 else []
if not self.return_messages:
buffer = get_buffer_string(
buffer,
human_prefix=self.human_prefix,
ai_prefix=self.ai_prefix,
)
return {self.memory_key: buffer}
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/buffer_window.html
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Source code for langchain.memory.buffer
from typing import Any, Dict, List, Optional
from pydantic import root_validator
from langchain.memory.chat_memory import BaseChatMemory, BaseMemory
from langchain.memory.utils import get_prompt_input_key
from langchain.schema import get_buffer_string
[docs]class ConversationBufferMemory(BaseChatMemory):
"""Buffer for storing conversation memory."""
human_prefix: str = "Human"
ai_prefix: str = "AI"
memory_key: str = "history" #: :meta private:
@property
def buffer(self) -> Any:
"""String buffer of memory."""
if self.return_messages:
return self.chat_memory.messages
else:
return get_buffer_string(
self.chat_memory.messages,
human_prefix=self.human_prefix,
ai_prefix=self.ai_prefix,
)
@property
def memory_variables(self) -> List[str]:
"""Will always return list of memory variables.
:meta private:
"""
return [self.memory_key]
[docs] def load_memory_variables(self, inputs: Dict[str, Any]) -> Dict[str, Any]:
"""Return history buffer."""
return {self.memory_key: self.buffer}
[docs]class ConversationStringBufferMemory(BaseMemory):
"""Buffer for storing conversation memory."""
human_prefix: str = "Human"
ai_prefix: str = "AI"
"""Prefix to use for AI generated responses."""
buffer: str = ""
output_key: Optional[str] = None
input_key: Optional[str] = None
memory_key: str = "history" #: :meta private:
@root_validator()
def validate_chains(cls, values: Dict) -> Dict:
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def validate_chains(cls, values: Dict) -> Dict:
"""Validate that return messages is not True."""
if values.get("return_messages", False):
raise ValueError(
"return_messages must be False for ConversationStringBufferMemory"
)
return values
@property
def memory_variables(self) -> List[str]:
"""Will always return list of memory variables.
:meta private:
"""
return [self.memory_key]
[docs] def load_memory_variables(self, inputs: Dict[str, Any]) -> Dict[str, str]:
"""Return history buffer."""
return {self.memory_key: self.buffer}
[docs] def save_context(self, inputs: Dict[str, Any], outputs: Dict[str, str]) -> None:
"""Save context from this conversation to buffer."""
if self.input_key is None:
prompt_input_key = get_prompt_input_key(inputs, self.memory_variables)
else:
prompt_input_key = self.input_key
if self.output_key is None:
if len(outputs) != 1:
raise ValueError(f"One output key expected, got {outputs.keys()}")
output_key = list(outputs.keys())[0]
else:
output_key = self.output_key
human = f"{self.human_prefix}: " + inputs[prompt_input_key]
ai = f"{self.ai_prefix}: " + outputs[output_key]
self.buffer += "\n" + "\n".join([human, ai])
[docs] def clear(self) -> None:
"""Clear memory contents."""
self.buffer = ""
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/buffer.html
|
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Source code for langchain.memory.vectorstore
"""Class for a VectorStore-backed memory object."""
from typing import Any, Dict, List, Optional, Union
from pydantic import Field
from langchain.memory.chat_memory import BaseMemory
from langchain.memory.utils import get_prompt_input_key
from langchain.schema import Document
from langchain.vectorstores.base import VectorStoreRetriever
[docs]class VectorStoreRetrieverMemory(BaseMemory):
"""Class for a VectorStore-backed memory object."""
retriever: VectorStoreRetriever = Field(exclude=True)
"""VectorStoreRetriever object to connect to."""
memory_key: str = "history" #: :meta private:
"""Key name to locate the memories in the result of load_memory_variables."""
input_key: Optional[str] = None
"""Key name to index the inputs to load_memory_variables."""
return_docs: bool = False
"""Whether or not to return the result of querying the database directly."""
@property
def memory_variables(self) -> List[str]:
"""The list of keys emitted from the load_memory_variables method."""
return [self.memory_key]
def _get_prompt_input_key(self, inputs: Dict[str, Any]) -> str:
"""Get the input key for the prompt."""
if self.input_key is None:
return get_prompt_input_key(inputs, self.memory_variables)
return self.input_key
[docs] def load_memory_variables(
self, inputs: Dict[str, Any]
) -> Dict[str, Union[List[Document], str]]:
"""Return history buffer."""
input_key = self._get_prompt_input_key(inputs)
query = inputs[input_key]
docs = self.retriever.get_relevant_documents(query)
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docs = self.retriever.get_relevant_documents(query)
result: Union[List[Document], str]
if not self.return_docs:
result = "\n".join([doc.page_content for doc in docs])
else:
result = docs
return {self.memory_key: result}
def _form_documents(
self, inputs: Dict[str, Any], outputs: Dict[str, str]
) -> List[Document]:
"""Format context from this conversation to buffer."""
# Each document should only include the current turn, not the chat history
filtered_inputs = {k: v for k, v in inputs.items() if k != self.memory_key}
texts = [
f"{k}: {v}"
for k, v in list(filtered_inputs.items()) + list(outputs.items())
]
page_content = "\n".join(texts)
return [Document(page_content=page_content)]
[docs] def save_context(self, inputs: Dict[str, Any], outputs: Dict[str, str]) -> None:
"""Save context from this conversation to buffer."""
documents = self._form_documents(inputs, outputs)
self.retriever.add_documents(documents)
[docs] def clear(self) -> None:
"""Nothing to clear."""
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/vectorstore.html
|
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Source code for langchain.memory.simple
from typing import Any, Dict, List
from langchain.schema import BaseMemory
[docs]class SimpleMemory(BaseMemory):
"""Simple memory for storing context or other bits of information that shouldn't
ever change between prompts.
"""
memories: Dict[str, Any] = dict()
@property
def memory_variables(self) -> List[str]:
return list(self.memories.keys())
[docs] def load_memory_variables(self, inputs: Dict[str, Any]) -> Dict[str, str]:
return self.memories
[docs] def save_context(self, inputs: Dict[str, Any], outputs: Dict[str, str]) -> None:
"""Nothing should be saved or changed, my memory is set in stone."""
pass
[docs] def clear(self) -> None:
"""Nothing to clear, got a memory like a vault."""
pass
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/simple.html
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Source code for langchain.memory.token_buffer
from typing import Any, Dict, List
from langchain.base_language import BaseLanguageModel
from langchain.memory.chat_memory import BaseChatMemory
from langchain.schema import BaseMessage, get_buffer_string
[docs]class ConversationTokenBufferMemory(BaseChatMemory):
"""Buffer for storing conversation memory."""
human_prefix: str = "Human"
ai_prefix: str = "AI"
llm: BaseLanguageModel
memory_key: str = "history"
max_token_limit: int = 2000
@property
def buffer(self) -> List[BaseMessage]:
"""String buffer of memory."""
return self.chat_memory.messages
@property
def memory_variables(self) -> List[str]:
"""Will always return list of memory variables.
:meta private:
"""
return [self.memory_key]
[docs] def load_memory_variables(self, inputs: Dict[str, Any]) -> Dict[str, Any]:
"""Return history buffer."""
buffer: Any = self.buffer
if self.return_messages:
final_buffer: Any = buffer
else:
final_buffer = get_buffer_string(
buffer,
human_prefix=self.human_prefix,
ai_prefix=self.ai_prefix,
)
return {self.memory_key: final_buffer}
[docs] def save_context(self, inputs: Dict[str, Any], outputs: Dict[str, str]) -> None:
"""Save context from this conversation to buffer. Pruned."""
super().save_context(inputs, outputs)
# Prune buffer if it exceeds max token limit
buffer = self.chat_memory.messages
curr_buffer_length = self.llm.get_num_tokens_from_messages(buffer)
if curr_buffer_length > self.max_token_limit:
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if curr_buffer_length > self.max_token_limit:
pruned_memory = []
while curr_buffer_length > self.max_token_limit:
pruned_memory.append(buffer.pop(0))
curr_buffer_length = self.llm.get_num_tokens_from_messages(buffer)
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/token_buffer.html
|
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|
Source code for langchain.memory.readonly
from typing import Any, Dict, List
from langchain.schema import BaseMemory
[docs]class ReadOnlySharedMemory(BaseMemory):
"""A memory wrapper that is read-only and cannot be changed."""
memory: BaseMemory
@property
def memory_variables(self) -> List[str]:
"""Return memory variables."""
return self.memory.memory_variables
[docs] def load_memory_variables(self, inputs: Dict[str, Any]) -> Dict[str, str]:
"""Load memory variables from memory."""
return self.memory.load_memory_variables(inputs)
[docs] def save_context(self, inputs: Dict[str, Any], outputs: Dict[str, str]) -> None:
"""Nothing should be saved or changed"""
pass
[docs] def clear(self) -> None:
"""Nothing to clear, got a memory like a vault."""
pass
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/readonly.html
|
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|
Source code for langchain.memory.combined
import warnings
from typing import Any, Dict, List, Set
from pydantic import validator
from langchain.memory.chat_memory import BaseChatMemory
from langchain.schema import BaseMemory
[docs]class CombinedMemory(BaseMemory):
"""Class for combining multiple memories' data together."""
memories: List[BaseMemory]
"""For tracking all the memories that should be accessed."""
@validator("memories")
def check_repeated_memory_variable(
cls, value: List[BaseMemory]
) -> List[BaseMemory]:
all_variables: Set[str] = set()
for val in value:
overlap = all_variables.intersection(val.memory_variables)
if overlap:
raise ValueError(
f"The same variables {overlap} are found in multiple"
"memory object, which is not allowed by CombinedMemory."
)
all_variables |= set(val.memory_variables)
return value
@validator("memories")
def check_input_key(cls, value: List[BaseMemory]) -> List[BaseMemory]:
"""Check that if memories are of type BaseChatMemory that input keys exist."""
for val in value:
if isinstance(val, BaseChatMemory):
if val.input_key is None:
warnings.warn(
"When using CombinedMemory, "
"input keys should be so the input is known. "
f" Was not set on {val}"
)
return value
@property
def memory_variables(self) -> List[str]:
"""All the memory variables that this instance provides."""
"""Collected from the all the linked memories."""
memory_variables = []
for memory in self.memories:
memory_variables.extend(memory.memory_variables)
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for memory in self.memories:
memory_variables.extend(memory.memory_variables)
return memory_variables
[docs] def load_memory_variables(self, inputs: Dict[str, Any]) -> Dict[str, str]:
"""Load all vars from sub-memories."""
memory_data: Dict[str, Any] = {}
# Collect vars from all sub-memories
for memory in self.memories:
data = memory.load_memory_variables(inputs)
memory_data = {
**memory_data,
**data,
}
return memory_data
[docs] def save_context(self, inputs: Dict[str, Any], outputs: Dict[str, str]) -> None:
"""Save context from this session for every memory."""
# Save context for all sub-memories
for memory in self.memories:
memory.save_context(inputs, outputs)
[docs] def clear(self) -> None:
"""Clear context from this session for every memory."""
for memory in self.memories:
memory.clear()
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/combined.html
|
07f918337aa8-0
|
Source code for langchain.memory.entity
import logging
from abc import ABC, abstractmethod
from itertools import islice
from typing import Any, Dict, Iterable, List, Optional
from pydantic import BaseModel, Field
from langchain.base_language import BaseLanguageModel
from langchain.chains.llm import LLMChain
from langchain.memory.chat_memory import BaseChatMemory
from langchain.memory.prompt import (
ENTITY_EXTRACTION_PROMPT,
ENTITY_SUMMARIZATION_PROMPT,
)
from langchain.memory.utils import get_prompt_input_key
from langchain.prompts.base import BasePromptTemplate
from langchain.schema import BaseMessage, get_buffer_string
logger = logging.getLogger(__name__)
class BaseEntityStore(BaseModel, ABC):
@abstractmethod
def get(self, key: str, default: Optional[str] = None) -> Optional[str]:
"""Get entity value from store."""
pass
@abstractmethod
def set(self, key: str, value: Optional[str]) -> None:
"""Set entity value in store."""
pass
@abstractmethod
def delete(self, key: str) -> None:
"""Delete entity value from store."""
pass
@abstractmethod
def exists(self, key: str) -> bool:
"""Check if entity exists in store."""
pass
@abstractmethod
def clear(self) -> None:
"""Delete all entities from store."""
pass
[docs]class InMemoryEntityStore(BaseEntityStore):
"""Basic in-memory entity store."""
store: Dict[str, Optional[str]] = {}
[docs] def get(self, key: str, default: Optional[str] = None) -> Optional[str]:
return self.store.get(key, default)
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return self.store.get(key, default)
[docs] def set(self, key: str, value: Optional[str]) -> None:
self.store[key] = value
[docs] def delete(self, key: str) -> None:
del self.store[key]
[docs] def exists(self, key: str) -> bool:
return key in self.store
[docs] def clear(self) -> None:
return self.store.clear()
[docs]class RedisEntityStore(BaseEntityStore):
"""Redis-backed Entity store. Entities get a TTL of 1 day by default, and
that TTL is extended by 3 days every time the entity is read back.
"""
redis_client: Any
session_id: str = "default"
key_prefix: str = "memory_store"
ttl: Optional[int] = 60 * 60 * 24
recall_ttl: Optional[int] = 60 * 60 * 24 * 3
def __init__(
self,
session_id: str = "default",
url: str = "redis://localhost:6379/0",
key_prefix: str = "memory_store",
ttl: Optional[int] = 60 * 60 * 24,
recall_ttl: Optional[int] = 60 * 60 * 24 * 3,
*args: Any,
**kwargs: Any,
):
try:
import redis
except ImportError:
raise ImportError(
"Could not import redis python package. "
"Please install it with `pip install redis`."
)
super().__init__(*args, **kwargs)
try:
self.redis_client = redis.Redis.from_url(url=url, decode_responses=True)
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|
self.redis_client = redis.Redis.from_url(url=url, decode_responses=True)
except redis.exceptions.ConnectionError as error:
logger.error(error)
self.session_id = session_id
self.key_prefix = key_prefix
self.ttl = ttl
self.recall_ttl = recall_ttl or ttl
@property
def full_key_prefix(self) -> str:
return f"{self.key_prefix}:{self.session_id}"
[docs] def get(self, key: str, default: Optional[str] = None) -> Optional[str]:
res = (
self.redis_client.getex(f"{self.full_key_prefix}:{key}", ex=self.recall_ttl)
or default
or ""
)
logger.debug(f"REDIS MEM get '{self.full_key_prefix}:{key}': '{res}'")
return res
[docs] def set(self, key: str, value: Optional[str]) -> None:
if not value:
return self.delete(key)
self.redis_client.set(f"{self.full_key_prefix}:{key}", value, ex=self.ttl)
logger.debug(
f"REDIS MEM set '{self.full_key_prefix}:{key}': '{value}' EX {self.ttl}"
)
[docs] def delete(self, key: str) -> None:
self.redis_client.delete(f"{self.full_key_prefix}:{key}")
[docs] def exists(self, key: str) -> bool:
return self.redis_client.exists(f"{self.full_key_prefix}:{key}") == 1
[docs] def clear(self) -> None:
# iterate a list in batches of size batch_size
def batched(iterable: Iterable[Any], batch_size: int) -> Iterable[Any]:
iterator = iter(iterable)
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|
07f918337aa8-3
|
iterator = iter(iterable)
while batch := list(islice(iterator, batch_size)):
yield batch
for keybatch in batched(
self.redis_client.scan_iter(f"{self.full_key_prefix}:*"), 500
):
self.redis_client.delete(*keybatch)
[docs]class SQLiteEntityStore(BaseEntityStore):
"""SQLite-backed Entity store"""
session_id: str = "default"
table_name: str = "memory_store"
def __init__(
self,
session_id: str = "default",
db_file: str = "entities.db",
table_name: str = "memory_store",
*args: Any,
**kwargs: Any,
):
try:
import sqlite3
except ImportError:
raise ImportError(
"Could not import sqlite3 python package. "
"Please install it with `pip install sqlite3`."
)
super().__init__(*args, **kwargs)
self.conn = sqlite3.connect(db_file)
self.session_id = session_id
self.table_name = table_name
self._create_table_if_not_exists()
@property
def full_table_name(self) -> str:
return f"{self.table_name}_{self.session_id}"
def _create_table_if_not_exists(self) -> None:
create_table_query = f"""
CREATE TABLE IF NOT EXISTS {self.full_table_name} (
key TEXT PRIMARY KEY,
value TEXT
)
"""
with self.conn:
self.conn.execute(create_table_query)
[docs] def get(self, key: str, default: Optional[str] = None) -> Optional[str]:
query = f"""
SELECT value
|
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|
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|
query = f"""
SELECT value
FROM {self.full_table_name}
WHERE key = ?
"""
cursor = self.conn.execute(query, (key,))
result = cursor.fetchone()
if result is not None:
value = result[0]
return value
return default
[docs] def set(self, key: str, value: Optional[str]) -> None:
if not value:
return self.delete(key)
query = f"""
INSERT OR REPLACE INTO {self.full_table_name} (key, value)
VALUES (?, ?)
"""
with self.conn:
self.conn.execute(query, (key, value))
[docs] def delete(self, key: str) -> None:
query = f"""
DELETE FROM {self.full_table_name}
WHERE key = ?
"""
with self.conn:
self.conn.execute(query, (key,))
[docs] def exists(self, key: str) -> bool:
query = f"""
SELECT 1
FROM {self.full_table_name}
WHERE key = ?
LIMIT 1
"""
cursor = self.conn.execute(query, (key,))
result = cursor.fetchone()
return result is not None
[docs] def clear(self) -> None:
query = f"""
DELETE FROM {self.full_table_name}
"""
with self.conn:
self.conn.execute(query)
[docs]class ConversationEntityMemory(BaseChatMemory):
"""Entity extractor & summarizer to memory."""
human_prefix: str = "Human"
ai_prefix: str = "AI"
llm: BaseLanguageModel
|
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|
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|
ai_prefix: str = "AI"
llm: BaseLanguageModel
entity_extraction_prompt: BasePromptTemplate = ENTITY_EXTRACTION_PROMPT
entity_summarization_prompt: BasePromptTemplate = ENTITY_SUMMARIZATION_PROMPT
entity_cache: List[str] = []
k: int = 3
chat_history_key: str = "history"
entity_store: BaseEntityStore = Field(default_factory=InMemoryEntityStore)
@property
def buffer(self) -> List[BaseMessage]:
return self.chat_memory.messages
@property
def memory_variables(self) -> List[str]:
"""Will always return list of memory variables.
:meta private:
"""
return ["entities", self.chat_history_key]
[docs] def load_memory_variables(self, inputs: Dict[str, Any]) -> Dict[str, Any]:
"""Return history buffer."""
chain = LLMChain(llm=self.llm, prompt=self.entity_extraction_prompt)
if self.input_key is None:
prompt_input_key = get_prompt_input_key(inputs, self.memory_variables)
else:
prompt_input_key = self.input_key
buffer_string = get_buffer_string(
self.buffer[-self.k * 2 :],
human_prefix=self.human_prefix,
ai_prefix=self.ai_prefix,
)
output = chain.predict(
history=buffer_string,
input=inputs[prompt_input_key],
)
if output.strip() == "NONE":
entities = []
else:
entities = [w.strip() for w in output.split(",")]
entity_summaries = {}
for entity in entities:
entity_summaries[entity] = self.entity_store.get(entity, "")
self.entity_cache = entities
if self.return_messages:
|
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|
07f918337aa8-6
|
self.entity_cache = entities
if self.return_messages:
buffer: Any = self.buffer[-self.k * 2 :]
else:
buffer = buffer_string
return {
self.chat_history_key: buffer,
"entities": entity_summaries,
}
[docs] def save_context(self, inputs: Dict[str, Any], outputs: Dict[str, str]) -> None:
"""Save context from this conversation to buffer."""
super().save_context(inputs, outputs)
if self.input_key is None:
prompt_input_key = get_prompt_input_key(inputs, self.memory_variables)
else:
prompt_input_key = self.input_key
buffer_string = get_buffer_string(
self.buffer[-self.k * 2 :],
human_prefix=self.human_prefix,
ai_prefix=self.ai_prefix,
)
input_data = inputs[prompt_input_key]
chain = LLMChain(llm=self.llm, prompt=self.entity_summarization_prompt)
for entity in self.entity_cache:
existing_summary = self.entity_store.get(entity, "")
output = chain.predict(
summary=existing_summary,
entity=entity,
history=buffer_string,
input=input_data,
)
self.entity_store.set(entity, output.strip())
[docs] def clear(self) -> None:
"""Clear memory contents."""
self.chat_memory.clear()
self.entity_cache.clear()
self.entity_store.clear()
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/entity.html
|
1b811296e431-0
|
Source code for langchain.memory.kg
from typing import Any, Dict, List, Type, Union
from pydantic import Field
from langchain.base_language import BaseLanguageModel
from langchain.chains.llm import LLMChain
from langchain.graphs import NetworkxEntityGraph
from langchain.graphs.networkx_graph import KnowledgeTriple, get_entities, parse_triples
from langchain.memory.chat_memory import BaseChatMemory
from langchain.memory.prompt import (
ENTITY_EXTRACTION_PROMPT,
KNOWLEDGE_TRIPLE_EXTRACTION_PROMPT,
)
from langchain.memory.utils import get_prompt_input_key
from langchain.prompts.base import BasePromptTemplate
from langchain.schema import (
BaseMessage,
SystemMessage,
get_buffer_string,
)
[docs]class ConversationKGMemory(BaseChatMemory):
"""Knowledge graph memory for storing conversation memory.
Integrates with external knowledge graph to store and retrieve
information about knowledge triples in the conversation.
"""
k: int = 2
human_prefix: str = "Human"
ai_prefix: str = "AI"
kg: NetworkxEntityGraph = Field(default_factory=NetworkxEntityGraph)
knowledge_extraction_prompt: BasePromptTemplate = KNOWLEDGE_TRIPLE_EXTRACTION_PROMPT
entity_extraction_prompt: BasePromptTemplate = ENTITY_EXTRACTION_PROMPT
llm: BaseLanguageModel
summary_message_cls: Type[BaseMessage] = SystemMessage
"""Number of previous utterances to include in the context."""
memory_key: str = "history" #: :meta private:
[docs] def load_memory_variables(self, inputs: Dict[str, Any]) -> Dict[str, Any]:
"""Return history buffer."""
entities = self._get_current_entities(inputs)
summary_strings = []
|
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|
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|
entities = self._get_current_entities(inputs)
summary_strings = []
for entity in entities:
knowledge = self.kg.get_entity_knowledge(entity)
if knowledge:
summary = f"On {entity}: {'. '.join(knowledge)}."
summary_strings.append(summary)
context: Union[str, List]
if not summary_strings:
context = [] if self.return_messages else ""
elif self.return_messages:
context = [
self.summary_message_cls(content=text) for text in summary_strings
]
else:
context = "\n".join(summary_strings)
return {self.memory_key: context}
@property
def memory_variables(self) -> List[str]:
"""Will always return list of memory variables.
:meta private:
"""
return [self.memory_key]
def _get_prompt_input_key(self, inputs: Dict[str, Any]) -> str:
"""Get the input key for the prompt."""
if self.input_key is None:
return get_prompt_input_key(inputs, self.memory_variables)
return self.input_key
def _get_prompt_output_key(self, outputs: Dict[str, Any]) -> str:
"""Get the output key for the prompt."""
if self.output_key is None:
if len(outputs) != 1:
raise ValueError(f"One output key expected, got {outputs.keys()}")
return list(outputs.keys())[0]
return self.output_key
[docs] def get_current_entities(self, input_string: str) -> List[str]:
chain = LLMChain(llm=self.llm, prompt=self.entity_extraction_prompt)
buffer_string = get_buffer_string(
self.chat_memory.messages[-self.k * 2 :],
human_prefix=self.human_prefix,
|
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|
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|
human_prefix=self.human_prefix,
ai_prefix=self.ai_prefix,
)
output = chain.predict(
history=buffer_string,
input=input_string,
)
return get_entities(output)
def _get_current_entities(self, inputs: Dict[str, Any]) -> List[str]:
"""Get the current entities in the conversation."""
prompt_input_key = self._get_prompt_input_key(inputs)
return self.get_current_entities(inputs[prompt_input_key])
[docs] def get_knowledge_triplets(self, input_string: str) -> List[KnowledgeTriple]:
chain = LLMChain(llm=self.llm, prompt=self.knowledge_extraction_prompt)
buffer_string = get_buffer_string(
self.chat_memory.messages[-self.k * 2 :],
human_prefix=self.human_prefix,
ai_prefix=self.ai_prefix,
)
output = chain.predict(
history=buffer_string,
input=input_string,
verbose=True,
)
knowledge = parse_triples(output)
return knowledge
def _get_and_update_kg(self, inputs: Dict[str, Any]) -> None:
"""Get and update knowledge graph from the conversation history."""
prompt_input_key = self._get_prompt_input_key(inputs)
knowledge = self.get_knowledge_triplets(inputs[prompt_input_key])
for triple in knowledge:
self.kg.add_triple(triple)
[docs] def save_context(self, inputs: Dict[str, Any], outputs: Dict[str, str]) -> None:
"""Save context from this conversation to buffer."""
super().save_context(inputs, outputs)
self._get_and_update_kg(inputs)
[docs] def clear(self) -> None:
"""Clear memory contents."""
|
https://python.langchain.com/en/latest/_modules/langchain/memory/kg.html
|
1b811296e431-3
|
[docs] def clear(self) -> None:
"""Clear memory contents."""
super().clear()
self.kg.clear()
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/kg.html
|
80c7273609bd-0
|
Source code for langchain.memory.summary_buffer
from typing import Any, Dict, List
from pydantic import root_validator
from langchain.memory.chat_memory import BaseChatMemory
from langchain.memory.summary import SummarizerMixin
from langchain.schema import BaseMessage, get_buffer_string
[docs]class ConversationSummaryBufferMemory(BaseChatMemory, SummarizerMixin):
"""Buffer with summarizer for storing conversation memory."""
max_token_limit: int = 2000
moving_summary_buffer: str = ""
memory_key: str = "history"
@property
def buffer(self) -> List[BaseMessage]:
return self.chat_memory.messages
@property
def memory_variables(self) -> List[str]:
"""Will always return list of memory variables.
:meta private:
"""
return [self.memory_key]
[docs] def load_memory_variables(self, inputs: Dict[str, Any]) -> Dict[str, Any]:
"""Return history buffer."""
buffer = self.buffer
if self.moving_summary_buffer != "":
first_messages: List[BaseMessage] = [
self.summary_message_cls(content=self.moving_summary_buffer)
]
buffer = first_messages + buffer
if self.return_messages:
final_buffer: Any = buffer
else:
final_buffer = get_buffer_string(
buffer, human_prefix=self.human_prefix, ai_prefix=self.ai_prefix
)
return {self.memory_key: final_buffer}
@root_validator()
def validate_prompt_input_variables(cls, values: Dict) -> Dict:
"""Validate that prompt input variables are consistent."""
prompt_variables = values["prompt"].input_variables
expected_keys = {"summary", "new_lines"}
if expected_keys != set(prompt_variables):
raise ValueError(
|
https://python.langchain.com/en/latest/_modules/langchain/memory/summary_buffer.html
|
80c7273609bd-1
|
if expected_keys != set(prompt_variables):
raise ValueError(
"Got unexpected prompt input variables. The prompt expects "
f"{prompt_variables}, but it should have {expected_keys}."
)
return values
[docs] def save_context(self, inputs: Dict[str, Any], outputs: Dict[str, str]) -> None:
"""Save context from this conversation to buffer."""
super().save_context(inputs, outputs)
self.prune()
[docs] def prune(self) -> None:
"""Prune buffer if it exceeds max token limit"""
buffer = self.chat_memory.messages
curr_buffer_length = self.llm.get_num_tokens_from_messages(buffer)
if curr_buffer_length > self.max_token_limit:
pruned_memory = []
while curr_buffer_length > self.max_token_limit:
pruned_memory.append(buffer.pop(0))
curr_buffer_length = self.llm.get_num_tokens_from_messages(buffer)
self.moving_summary_buffer = self.predict_new_summary(
pruned_memory, self.moving_summary_buffer
)
[docs] def clear(self) -> None:
"""Clear memory contents."""
super().clear()
self.moving_summary_buffer = ""
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/summary_buffer.html
|
31c9e300e22e-0
|
Source code for langchain.memory.summary
from __future__ import annotations
from typing import Any, Dict, List, Type
from pydantic import BaseModel, root_validator
from langchain.base_language import BaseLanguageModel
from langchain.chains.llm import LLMChain
from langchain.memory.chat_memory import BaseChatMemory
from langchain.memory.prompt import SUMMARY_PROMPT
from langchain.prompts.base import BasePromptTemplate
from langchain.schema import (
BaseChatMessageHistory,
BaseMessage,
SystemMessage,
get_buffer_string,
)
class SummarizerMixin(BaseModel):
human_prefix: str = "Human"
ai_prefix: str = "AI"
llm: BaseLanguageModel
prompt: BasePromptTemplate = SUMMARY_PROMPT
summary_message_cls: Type[BaseMessage] = SystemMessage
def predict_new_summary(
self, messages: List[BaseMessage], existing_summary: str
) -> str:
new_lines = get_buffer_string(
messages,
human_prefix=self.human_prefix,
ai_prefix=self.ai_prefix,
)
chain = LLMChain(llm=self.llm, prompt=self.prompt)
return chain.predict(summary=existing_summary, new_lines=new_lines)
[docs]class ConversationSummaryMemory(BaseChatMemory, SummarizerMixin):
"""Conversation summarizer to memory."""
buffer: str = ""
memory_key: str = "history" #: :meta private:
[docs] @classmethod
def from_messages(
cls,
llm: BaseLanguageModel,
chat_memory: BaseChatMessageHistory,
*,
summarize_step: int = 2,
**kwargs: Any,
) -> ConversationSummaryMemory:
|
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|
31c9e300e22e-1
|
**kwargs: Any,
) -> ConversationSummaryMemory:
obj = cls(llm=llm, chat_memory=chat_memory, **kwargs)
for i in range(0, len(obj.chat_memory.messages), summarize_step):
obj.buffer = obj.predict_new_summary(
obj.chat_memory.messages[i : i + summarize_step], obj.buffer
)
return obj
@property
def memory_variables(self) -> List[str]:
"""Will always return list of memory variables.
:meta private:
"""
return [self.memory_key]
[docs] def load_memory_variables(self, inputs: Dict[str, Any]) -> Dict[str, Any]:
"""Return history buffer."""
if self.return_messages:
buffer: Any = [self.summary_message_cls(content=self.buffer)]
else:
buffer = self.buffer
return {self.memory_key: buffer}
@root_validator()
def validate_prompt_input_variables(cls, values: Dict) -> Dict:
"""Validate that prompt input variables are consistent."""
prompt_variables = values["prompt"].input_variables
expected_keys = {"summary", "new_lines"}
if expected_keys != set(prompt_variables):
raise ValueError(
"Got unexpected prompt input variables. The prompt expects "
f"{prompt_variables}, but it should have {expected_keys}."
)
return values
[docs] def save_context(self, inputs: Dict[str, Any], outputs: Dict[str, str]) -> None:
"""Save context from this conversation to buffer."""
super().save_context(inputs, outputs)
self.buffer = self.predict_new_summary(
self.chat_memory.messages[-2:], self.buffer
)
[docs] def clear(self) -> None:
"""Clear memory contents."""
|
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|
31c9e300e22e-2
|
[docs] def clear(self) -> None:
"""Clear memory contents."""
super().clear()
self.buffer = ""
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/summary.html
|
214e92acf3f6-0
|
Source code for langchain.memory.chat_message_histories.in_memory
from typing import List
from pydantic import BaseModel
from langchain.schema import (
BaseChatMessageHistory,
BaseMessage,
)
[docs]class ChatMessageHistory(BaseChatMessageHistory, BaseModel):
messages: List[BaseMessage] = []
[docs] def add_message(self, message: BaseMessage) -> None:
"""Add a self-created message to the store"""
self.messages.append(message)
[docs] def clear(self) -> None:
self.messages = []
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/chat_message_histories/in_memory.html
|
805788af32ff-0
|
Source code for langchain.memory.chat_message_histories.cosmos_db
"""Azure CosmosDB Memory History."""
from __future__ import annotations
import logging
from types import TracebackType
from typing import TYPE_CHECKING, Any, List, Optional, Type
from langchain.schema import (
BaseChatMessageHistory,
BaseMessage,
messages_from_dict,
messages_to_dict,
)
logger = logging.getLogger(__name__)
if TYPE_CHECKING:
from azure.cosmos import ContainerProxy
[docs]class CosmosDBChatMessageHistory(BaseChatMessageHistory):
"""Chat history backed by Azure CosmosDB."""
def __init__(
self,
cosmos_endpoint: str,
cosmos_database: str,
cosmos_container: str,
session_id: str,
user_id: str,
credential: Any = None,
connection_string: Optional[str] = None,
ttl: Optional[int] = None,
cosmos_client_kwargs: Optional[dict] = None,
):
"""
Initializes a new instance of the CosmosDBChatMessageHistory class.
Make sure to call prepare_cosmos or use the context manager to make
sure your database is ready.
Either a credential or a connection string must be provided.
:param cosmos_endpoint: The connection endpoint for the Azure Cosmos DB account.
:param cosmos_database: The name of the database to use.
:param cosmos_container: The name of the container to use.
:param session_id: The session ID to use, can be overwritten while loading.
:param user_id: The user ID to use, can be overwritten while loading.
:param credential: The credential to use to authenticate to Azure Cosmos DB.
:param connection_string: The connection string to use to authenticate.
|
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|
805788af32ff-1
|
:param connection_string: The connection string to use to authenticate.
:param ttl: The time to live (in seconds) to use for documents in the container.
:param cosmos_client_kwargs: Additional kwargs to pass to the CosmosClient.
"""
self.cosmos_endpoint = cosmos_endpoint
self.cosmos_database = cosmos_database
self.cosmos_container = cosmos_container
self.credential = credential
self.conn_string = connection_string
self.session_id = session_id
self.user_id = user_id
self.ttl = ttl
self.messages: List[BaseMessage] = []
try:
from azure.cosmos import ( # pylint: disable=import-outside-toplevel # noqa: E501
CosmosClient,
)
except ImportError as exc:
raise ImportError(
"You must install the azure-cosmos package to use the CosmosDBChatMessageHistory." # noqa: E501
) from exc
if self.credential:
self._client = CosmosClient(
url=self.cosmos_endpoint,
credential=self.credential,
**cosmos_client_kwargs or {},
)
elif self.conn_string:
self._client = CosmosClient.from_connection_string(
conn_str=self.conn_string,
**cosmos_client_kwargs or {},
)
else:
raise ValueError("Either a connection string or a credential must be set.")
self._container: Optional[ContainerProxy] = None
[docs] def prepare_cosmos(self) -> None:
"""Prepare the CosmosDB client.
Use this function or the context manager to make sure your database is ready.
"""
try:
from azure.cosmos import ( # pylint: disable=import-outside-toplevel # noqa: E501
|
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|
805788af32ff-2
|
PartitionKey,
)
except ImportError as exc:
raise ImportError(
"You must install the azure-cosmos package to use the CosmosDBChatMessageHistory." # noqa: E501
) from exc
database = self._client.create_database_if_not_exists(self.cosmos_database)
self._container = database.create_container_if_not_exists(
self.cosmos_container,
partition_key=PartitionKey("/user_id"),
default_ttl=self.ttl,
)
self.load_messages()
def __enter__(self) -> "CosmosDBChatMessageHistory":
"""Context manager entry point."""
self._client.__enter__()
self.prepare_cosmos()
return self
def __exit__(
self,
exc_type: Optional[Type[BaseException]],
exc_val: Optional[BaseException],
traceback: Optional[TracebackType],
) -> None:
"""Context manager exit"""
self.upsert_messages()
self._client.__exit__(exc_type, exc_val, traceback)
[docs] def load_messages(self) -> None:
"""Retrieve the messages from Cosmos"""
if not self._container:
raise ValueError("Container not initialized")
try:
from azure.cosmos.exceptions import ( # pylint: disable=import-outside-toplevel # noqa: E501
CosmosHttpResponseError,
)
except ImportError as exc:
raise ImportError(
"You must install the azure-cosmos package to use the CosmosDBChatMessageHistory." # noqa: E501
) from exc
try:
item = self._container.read_item(
item=self.session_id, partition_key=self.user_id
)
except CosmosHttpResponseError:
|
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|
805788af32ff-3
|
)
except CosmosHttpResponseError:
logger.info("no session found")
return
if "messages" in item and len(item["messages"]) > 0:
self.messages = messages_from_dict(item["messages"])
[docs] def add_message(self, message: BaseMessage) -> None:
"""Add a self-created message to the store"""
self.messages.append(message)
self.upsert_messages()
[docs] def upsert_messages(self) -> None:
"""Update the cosmosdb item."""
if not self._container:
raise ValueError("Container not initialized")
self._container.upsert_item(
body={
"id": self.session_id,
"user_id": self.user_id,
"messages": messages_to_dict(self.messages),
}
)
[docs] def clear(self) -> None:
"""Clear session memory from this memory and cosmos."""
self.messages = []
if self._container:
self._container.delete_item(
item=self.session_id, partition_key=self.user_id
)
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/chat_message_histories/cosmos_db.html
|
43f24cbaa2a4-0
|
Source code for langchain.memory.chat_message_histories.mongodb
import json
import logging
from typing import List
from langchain.schema import (
BaseChatMessageHistory,
BaseMessage,
_message_to_dict,
messages_from_dict,
)
logger = logging.getLogger(__name__)
DEFAULT_DBNAME = "chat_history"
DEFAULT_COLLECTION_NAME = "message_store"
[docs]class MongoDBChatMessageHistory(BaseChatMessageHistory):
"""Chat message history that stores history in MongoDB.
Args:
connection_string: connection string to connect to MongoDB
session_id: arbitrary key that is used to store the messages
of a single chat session.
database_name: name of the database to use
collection_name: name of the collection to use
"""
def __init__(
self,
connection_string: str,
session_id: str,
database_name: str = DEFAULT_DBNAME,
collection_name: str = DEFAULT_COLLECTION_NAME,
):
from pymongo import MongoClient, errors
self.connection_string = connection_string
self.session_id = session_id
self.database_name = database_name
self.collection_name = collection_name
try:
self.client: MongoClient = MongoClient(connection_string)
except errors.ConnectionFailure as error:
logger.error(error)
self.db = self.client[database_name]
self.collection = self.db[collection_name]
@property
def messages(self) -> List[BaseMessage]: # type: ignore
"""Retrieve the messages from MongoDB"""
from pymongo import errors
try:
cursor = self.collection.find({"SessionId": self.session_id})
except errors.OperationFailure as error:
logger.error(error)
if cursor:
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|
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except errors.OperationFailure as error:
logger.error(error)
if cursor:
items = [json.loads(document["History"]) for document in cursor]
else:
items = []
messages = messages_from_dict(items)
return messages
[docs] def add_message(self, message: BaseMessage) -> None:
"""Append the message to the record in MongoDB"""
from pymongo import errors
try:
self.collection.insert_one(
{
"SessionId": self.session_id,
"History": json.dumps(_message_to_dict(message)),
}
)
except errors.WriteError as err:
logger.error(err)
[docs] def clear(self) -> None:
"""Clear session memory from MongoDB"""
from pymongo import errors
try:
self.collection.delete_many({"SessionId": self.session_id})
except errors.WriteError as err:
logger.error(err)
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/chat_message_histories/mongodb.html
|
2f37dce79a4d-0
|
Source code for langchain.memory.chat_message_histories.redis
import json
import logging
from typing import List, Optional
from langchain.schema import (
BaseChatMessageHistory,
BaseMessage,
_message_to_dict,
messages_from_dict,
)
logger = logging.getLogger(__name__)
[docs]class RedisChatMessageHistory(BaseChatMessageHistory):
def __init__(
self,
session_id: str,
url: str = "redis://localhost:6379/0",
key_prefix: str = "message_store:",
ttl: Optional[int] = None,
):
try:
import redis
except ImportError:
raise ImportError(
"Could not import redis python package. "
"Please install it with `pip install redis`."
)
try:
self.redis_client = redis.Redis.from_url(url=url)
except redis.exceptions.ConnectionError as error:
logger.error(error)
self.session_id = session_id
self.key_prefix = key_prefix
self.ttl = ttl
@property
def key(self) -> str:
"""Construct the record key to use"""
return self.key_prefix + self.session_id
@property
def messages(self) -> List[BaseMessage]: # type: ignore
"""Retrieve the messages from Redis"""
_items = self.redis_client.lrange(self.key, 0, -1)
items = [json.loads(m.decode("utf-8")) for m in _items[::-1]]
messages = messages_from_dict(items)
return messages
[docs] def add_message(self, message: BaseMessage) -> None:
"""Append the message to the record in Redis"""
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"""Append the message to the record in Redis"""
self.redis_client.lpush(self.key, json.dumps(_message_to_dict(message)))
if self.ttl:
self.redis_client.expire(self.key, self.ttl)
[docs] def clear(self) -> None:
"""Clear session memory from Redis"""
self.redis_client.delete(self.key)
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/chat_message_histories/redis.html
|
6d5de498059b-0
|
Source code for langchain.memory.chat_message_histories.cassandra
import json
import logging
from typing import List
from langchain.schema import (
BaseChatMessageHistory,
BaseMessage,
_message_to_dict,
messages_from_dict,
)
logger = logging.getLogger(__name__)
DEFAULT_KEYSPACE_NAME = "chat_history"
DEFAULT_TABLE_NAME = "message_store"
DEFAULT_USERNAME = "cassandra"
DEFAULT_PASSWORD = "cassandra"
DEFAULT_PORT = 9042
[docs]class CassandraChatMessageHistory(BaseChatMessageHistory):
"""Chat message history that stores history in Cassandra.
Args:
contact_points: list of ips to connect to Cassandra cluster
session_id: arbitrary key that is used to store the messages
of a single chat session.
port: port to connect to Cassandra cluster
username: username to connect to Cassandra cluster
password: password to connect to Cassandra cluster
keyspace_name: name of the keyspace to use
table_name: name of the table to use
"""
def __init__(
self,
contact_points: List[str],
session_id: str,
port: int = DEFAULT_PORT,
username: str = DEFAULT_USERNAME,
password: str = DEFAULT_PASSWORD,
keyspace_name: str = DEFAULT_KEYSPACE_NAME,
table_name: str = DEFAULT_TABLE_NAME,
):
self.contact_points = contact_points
self.session_id = session_id
self.port = port
self.username = username
self.password = password
self.keyspace_name = keyspace_name
self.table_name = table_name
try:
from cassandra import (
AuthenticationFailed,
OperationTimedOut,
UnresolvableContactPoints,
)
|
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|
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OperationTimedOut,
UnresolvableContactPoints,
)
from cassandra.cluster import Cluster, PlainTextAuthProvider
except ImportError:
raise ValueError(
"Could not import cassandra-driver python package. "
"Please install it with `pip install cassandra-driver`."
)
self.cluster: Cluster = Cluster(
contact_points,
port=port,
auth_provider=PlainTextAuthProvider(
username=self.username, password=self.password
),
)
try:
self.session = self.cluster.connect()
except (
AuthenticationFailed,
UnresolvableContactPoints,
OperationTimedOut,
) as error:
logger.error(
"Unable to establish connection with \
cassandra chat message history database"
)
raise error
self._prepare_cassandra()
def _prepare_cassandra(self) -> None:
"""Create the keyspace and table if they don't exist yet"""
from cassandra import OperationTimedOut, Unavailable
try:
self.session.execute(
f"""CREATE KEYSPACE IF NOT EXISTS
{self.keyspace_name} WITH REPLICATION =
{{ 'class' : 'SimpleStrategy', 'replication_factor' : 1 }};"""
)
except (OperationTimedOut, Unavailable) as error:
logger.error(
f"Unable to create cassandra \
chat message history keyspace: {self.keyspace_name}."
)
raise error
self.session.set_keyspace(self.keyspace_name)
try:
self.session.execute(
f"""CREATE TABLE IF NOT EXISTS
{self.table_name} (id UUID, session_id varchar,
|
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|
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|
{self.table_name} (id UUID, session_id varchar,
history text, PRIMARY KEY ((session_id), id) );"""
)
except (OperationTimedOut, Unavailable) as error:
logger.error(
f"Unable to create cassandra \
chat message history table: {self.table_name}"
)
raise error
@property
def messages(self) -> List[BaseMessage]: # type: ignore
"""Retrieve the messages from Cassandra"""
from cassandra import ReadFailure, ReadTimeout, Unavailable
try:
rows = self.session.execute(
f"""SELECT * FROM {self.table_name}
WHERE session_id = '{self.session_id}' ;"""
)
except (Unavailable, ReadTimeout, ReadFailure) as error:
logger.error("Unable to Retreive chat history messages from cassadra")
raise error
if rows:
items = [json.loads(row.history) for row in rows]
else:
items = []
messages = messages_from_dict(items)
return messages
[docs] def add_message(self, message: BaseMessage) -> None:
"""Append the message to the record in Cassandra"""
import uuid
from cassandra import Unavailable, WriteFailure, WriteTimeout
try:
self.session.execute(
"""INSERT INTO message_store
(id, session_id, history) VALUES (%s, %s, %s);""",
(uuid.uuid4(), self.session_id, json.dumps(_message_to_dict(message))),
)
except (Unavailable, WriteTimeout, WriteFailure) as error:
logger.error("Unable to write chat history messages to cassandra")
raise error
|
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|
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|
logger.error("Unable to write chat history messages to cassandra")
raise error
[docs] def clear(self) -> None:
"""Clear session memory from Cassandra"""
from cassandra import OperationTimedOut, Unavailable
try:
self.session.execute(
f"DELETE FROM {self.table_name} WHERE session_id = '{self.session_id}';"
)
except (Unavailable, OperationTimedOut) as error:
logger.error("Unable to clear chat history messages from cassandra")
raise error
def __del__(self) -> None:
if self.session:
self.session.shutdown()
if self.cluster:
self.cluster.shutdown()
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/chat_message_histories/cassandra.html
|
1554f7f13531-0
|
Source code for langchain.memory.chat_message_histories.dynamodb
import logging
from typing import List
from langchain.schema import (
BaseChatMessageHistory,
BaseMessage,
_message_to_dict,
messages_from_dict,
messages_to_dict,
)
logger = logging.getLogger(__name__)
[docs]class DynamoDBChatMessageHistory(BaseChatMessageHistory):
"""Chat message history that stores history in AWS DynamoDB.
This class expects that a DynamoDB table with name `table_name`
and a partition Key of `SessionId` is present.
Args:
table_name: name of the DynamoDB table
session_id: arbitrary key that is used to store the messages
of a single chat session.
"""
def __init__(self, table_name: str, session_id: str):
import boto3
client = boto3.resource("dynamodb")
self.table = client.Table(table_name)
self.session_id = session_id
@property
def messages(self) -> List[BaseMessage]: # type: ignore
"""Retrieve the messages from DynamoDB"""
from botocore.exceptions import ClientError
try:
response = self.table.get_item(Key={"SessionId": self.session_id})
except ClientError as error:
if error.response["Error"]["Code"] == "ResourceNotFoundException":
logger.warning("No record found with session id: %s", self.session_id)
else:
logger.error(error)
if response and "Item" in response:
items = response["Item"]["History"]
else:
items = []
messages = messages_from_dict(items)
return messages
[docs] def add_message(self, message: BaseMessage) -> None:
|
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|
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|
[docs] def add_message(self, message: BaseMessage) -> None:
"""Append the message to the record in DynamoDB"""
from botocore.exceptions import ClientError
messages = messages_to_dict(self.messages)
_message = _message_to_dict(message)
messages.append(_message)
try:
self.table.put_item(
Item={"SessionId": self.session_id, "History": messages}
)
except ClientError as err:
logger.error(err)
[docs] def clear(self) -> None:
"""Clear session memory from DynamoDB"""
from botocore.exceptions import ClientError
try:
self.table.delete_item(Key={"SessionId": self.session_id})
except ClientError as err:
logger.error(err)
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/chat_message_histories/dynamodb.html
|
56b364a00660-0
|
Source code for langchain.memory.chat_message_histories.momento
from __future__ import annotations
import json
from datetime import timedelta
from typing import TYPE_CHECKING, Any, Optional
from langchain.schema import (
BaseChatMessageHistory,
BaseMessage,
_message_to_dict,
messages_from_dict,
)
from langchain.utils import get_from_env
if TYPE_CHECKING:
import momento
def _ensure_cache_exists(cache_client: momento.CacheClient, cache_name: str) -> None:
"""Create cache if it doesn't exist.
Raises:
SdkException: Momento service or network error
Exception: Unexpected response
"""
from momento.responses import CreateCache
create_cache_response = cache_client.create_cache(cache_name)
if isinstance(create_cache_response, CreateCache.Success) or isinstance(
create_cache_response, CreateCache.CacheAlreadyExists
):
return None
elif isinstance(create_cache_response, CreateCache.Error):
raise create_cache_response.inner_exception
else:
raise Exception(f"Unexpected response cache creation: {create_cache_response}")
[docs]class MomentoChatMessageHistory(BaseChatMessageHistory):
"""Chat message history cache that uses Momento as a backend.
See https://gomomento.com/"""
def __init__(
self,
session_id: str,
cache_client: momento.CacheClient,
cache_name: str,
*,
key_prefix: str = "message_store:",
ttl: Optional[timedelta] = None,
ensure_cache_exists: bool = True,
):
"""Instantiate a chat message history cache that uses Momento as a backend.
Note: to instantiate the cache client passed to MomentoChatMessageHistory,
|
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|
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|
Note: to instantiate the cache client passed to MomentoChatMessageHistory,
you must have a Momento account at https://gomomento.com/.
Args:
session_id (str): The session ID to use for this chat session.
cache_client (CacheClient): The Momento cache client.
cache_name (str): The name of the cache to use to store the messages.
key_prefix (str, optional): The prefix to apply to the cache key.
Defaults to "message_store:".
ttl (Optional[timedelta], optional): The TTL to use for the messages.
Defaults to None, ie the default TTL of the cache will be used.
ensure_cache_exists (bool, optional): Create the cache if it doesn't exist.
Defaults to True.
Raises:
ImportError: Momento python package is not installed.
TypeError: cache_client is not of type momento.CacheClientObject
"""
try:
from momento import CacheClient
from momento.requests import CollectionTtl
except ImportError:
raise ImportError(
"Could not import momento python package. "
"Please install it with `pip install momento`."
)
if not isinstance(cache_client, CacheClient):
raise TypeError("cache_client must be a momento.CacheClient object.")
if ensure_cache_exists:
_ensure_cache_exists(cache_client, cache_name)
self.key = key_prefix + session_id
self.cache_client = cache_client
self.cache_name = cache_name
if ttl is not None:
self.ttl = CollectionTtl.of(ttl)
else:
self.ttl = CollectionTtl.from_cache_ttl()
[docs] @classmethod
def from_client_params(
cls,
session_id: str,
|
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|
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|
def from_client_params(
cls,
session_id: str,
cache_name: str,
ttl: timedelta,
*,
configuration: Optional[momento.config.Configuration] = None,
auth_token: Optional[str] = None,
**kwargs: Any,
) -> MomentoChatMessageHistory:
"""Construct cache from CacheClient parameters."""
try:
from momento import CacheClient, Configurations, CredentialProvider
except ImportError:
raise ImportError(
"Could not import momento python package. "
"Please install it with `pip install momento`."
)
if configuration is None:
configuration = Configurations.Laptop.v1()
auth_token = auth_token or get_from_env("auth_token", "MOMENTO_AUTH_TOKEN")
credentials = CredentialProvider.from_string(auth_token)
cache_client = CacheClient(configuration, credentials, default_ttl=ttl)
return cls(session_id, cache_client, cache_name, ttl=ttl, **kwargs)
@property
def messages(self) -> list[BaseMessage]: # type: ignore[override]
"""Retrieve the messages from Momento.
Raises:
SdkException: Momento service or network error
Exception: Unexpected response
Returns:
list[BaseMessage]: List of cached messages
"""
from momento.responses import CacheListFetch
fetch_response = self.cache_client.list_fetch(self.cache_name, self.key)
if isinstance(fetch_response, CacheListFetch.Hit):
items = [json.loads(m) for m in fetch_response.value_list_string]
return messages_from_dict(items)
elif isinstance(fetch_response, CacheListFetch.Miss):
return []
elif isinstance(fetch_response, CacheListFetch.Error):
|
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|
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|
return []
elif isinstance(fetch_response, CacheListFetch.Error):
raise fetch_response.inner_exception
else:
raise Exception(f"Unexpected response: {fetch_response}")
[docs] def add_message(self, message: BaseMessage) -> None:
"""Store a message in the cache.
Args:
message (BaseMessage): The message object to store.
Raises:
SdkException: Momento service or network error.
Exception: Unexpected response.
"""
from momento.responses import CacheListPushBack
item = json.dumps(_message_to_dict(message))
push_response = self.cache_client.list_push_back(
self.cache_name, self.key, item, ttl=self.ttl
)
if isinstance(push_response, CacheListPushBack.Success):
return None
elif isinstance(push_response, CacheListPushBack.Error):
raise push_response.inner_exception
else:
raise Exception(f"Unexpected response: {push_response}")
[docs] def clear(self) -> None:
"""Remove the session's messages from the cache.
Raises:
SdkException: Momento service or network error.
Exception: Unexpected response.
"""
from momento.responses import CacheDelete
delete_response = self.cache_client.delete(self.cache_name, self.key)
if isinstance(delete_response, CacheDelete.Success):
return None
elif isinstance(delete_response, CacheDelete.Error):
raise delete_response.inner_exception
else:
raise Exception(f"Unexpected response: {delete_response}")
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/chat_message_histories/momento.html
|
108157a64fe0-0
|
Source code for langchain.memory.chat_message_histories.postgres
import json
import logging
from typing import List
from langchain.schema import (
BaseChatMessageHistory,
BaseMessage,
_message_to_dict,
messages_from_dict,
)
logger = logging.getLogger(__name__)
DEFAULT_CONNECTION_STRING = "postgresql://postgres:mypassword@localhost/chat_history"
[docs]class PostgresChatMessageHistory(BaseChatMessageHistory):
def __init__(
self,
session_id: str,
connection_string: str = DEFAULT_CONNECTION_STRING,
table_name: str = "message_store",
):
import psycopg
from psycopg.rows import dict_row
try:
self.connection = psycopg.connect(connection_string)
self.cursor = self.connection.cursor(row_factory=dict_row)
except psycopg.OperationalError as error:
logger.error(error)
self.session_id = session_id
self.table_name = table_name
self._create_table_if_not_exists()
def _create_table_if_not_exists(self) -> None:
create_table_query = f"""CREATE TABLE IF NOT EXISTS {self.table_name} (
id SERIAL PRIMARY KEY,
session_id TEXT NOT NULL,
message JSONB NOT NULL
);"""
self.cursor.execute(create_table_query)
self.connection.commit()
@property
def messages(self) -> List[BaseMessage]: # type: ignore
"""Retrieve the messages from PostgreSQL"""
query = f"SELECT message FROM {self.table_name} WHERE session_id = %s;"
self.cursor.execute(query, (self.session_id,))
items = [record["message"] for record in self.cursor.fetchall()]
messages = messages_from_dict(items)
return messages
|
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|
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|
messages = messages_from_dict(items)
return messages
[docs] def add_message(self, message: BaseMessage) -> None:
"""Append the message to the record in PostgreSQL"""
from psycopg import sql
query = sql.SQL("INSERT INTO {} (session_id, message) VALUES (%s, %s);").format(
sql.Identifier(self.table_name)
)
self.cursor.execute(
query, (self.session_id, json.dumps(_message_to_dict(message)))
)
self.connection.commit()
[docs] def clear(self) -> None:
"""Clear session memory from PostgreSQL"""
query = f"DELETE FROM {self.table_name} WHERE session_id = %s;"
self.cursor.execute(query, (self.session_id,))
self.connection.commit()
def __del__(self) -> None:
if self.cursor:
self.cursor.close()
if self.connection:
self.connection.close()
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/chat_message_histories/postgres.html
|
71a4bc0772e6-0
|
Source code for langchain.memory.chat_message_histories.file
import json
import logging
from pathlib import Path
from typing import List
from langchain.schema import (
BaseChatMessageHistory,
BaseMessage,
messages_from_dict,
messages_to_dict,
)
logger = logging.getLogger(__name__)
[docs]class FileChatMessageHistory(BaseChatMessageHistory):
"""
Chat message history that stores history in a local file.
Args:
file_path: path of the local file to store the messages.
"""
def __init__(self, file_path: str):
self.file_path = Path(file_path)
if not self.file_path.exists():
self.file_path.touch()
self.file_path.write_text(json.dumps([]))
@property
def messages(self) -> List[BaseMessage]: # type: ignore
"""Retrieve the messages from the local file"""
items = json.loads(self.file_path.read_text())
messages = messages_from_dict(items)
return messages
[docs] def add_message(self, message: BaseMessage) -> None:
"""Append the message to the record in the local file"""
messages = messages_to_dict(self.messages)
messages.append(messages_to_dict([message])[0])
self.file_path.write_text(json.dumps(messages))
[docs] def clear(self) -> None:
"""Clear session memory from the local file"""
self.file_path.write_text(json.dumps([]))
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/memory/chat_message_histories/file.html
|
d383b6c5b926-0
|
Source code for langchain.prompts.few_shot
"""Prompt template that contains few shot examples."""
from typing import Any, Dict, List, Optional
from pydantic import Extra, root_validator
from langchain.prompts.base import (
DEFAULT_FORMATTER_MAPPING,
StringPromptTemplate,
check_valid_template,
)
from langchain.prompts.example_selector.base import BaseExampleSelector
from langchain.prompts.prompt import PromptTemplate
[docs]class FewShotPromptTemplate(StringPromptTemplate):
"""Prompt template that contains few shot examples."""
examples: Optional[List[dict]] = None
"""Examples to format into the prompt.
Either this or example_selector should be provided."""
example_selector: Optional[BaseExampleSelector] = None
"""ExampleSelector to choose the examples to format into the prompt.
Either this or examples should be provided."""
example_prompt: PromptTemplate
"""PromptTemplate used to format an individual example."""
suffix: str
"""A prompt template string to put after the examples."""
input_variables: List[str]
"""A list of the names of the variables the prompt template expects."""
example_separator: str = "\n\n"
"""String separator used to join the prefix, the examples, and suffix."""
prefix: str = ""
"""A prompt template string to put before the examples."""
template_format: str = "f-string"
"""The format of the prompt template. Options are: 'f-string', 'jinja2'."""
validate_template: bool = True
"""Whether or not to try validating the template."""
@root_validator(pre=True)
def check_examples_and_selector(cls, values: Dict) -> Dict:
"""Check that one and only one of examples/example_selector are provided."""
|
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|
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|
"""Check that one and only one of examples/example_selector are provided."""
examples = values.get("examples", None)
example_selector = values.get("example_selector", None)
if examples and example_selector:
raise ValueError(
"Only one of 'examples' and 'example_selector' should be provided"
)
if examples is None and example_selector is None:
raise ValueError(
"One of 'examples' and 'example_selector' should be provided"
)
return values
@root_validator()
def template_is_valid(cls, values: Dict) -> Dict:
"""Check that prefix, suffix and input variables are consistent."""
if values["validate_template"]:
check_valid_template(
values["prefix"] + values["suffix"],
values["template_format"],
values["input_variables"] + list(values["partial_variables"]),
)
return values
class Config:
"""Configuration for this pydantic object."""
extra = Extra.forbid
arbitrary_types_allowed = True
def _get_examples(self, **kwargs: Any) -> List[dict]:
if self.examples is not None:
return self.examples
elif self.example_selector is not None:
return self.example_selector.select_examples(kwargs)
else:
raise ValueError
[docs] def format(self, **kwargs: Any) -> str:
"""Format the prompt with the inputs.
Args:
kwargs: Any arguments to be passed to the prompt template.
Returns:
A formatted string.
Example:
.. code-block:: python
prompt.format(variable1="foo")
"""
kwargs = self._merge_partial_and_user_variables(**kwargs)
# Get the examples to use.
|
https://python.langchain.com/en/latest/_modules/langchain/prompts/few_shot.html
|
d383b6c5b926-2
|
# Get the examples to use.
examples = self._get_examples(**kwargs)
examples = [
{k: e[k] for k in self.example_prompt.input_variables} for e in examples
]
# Format the examples.
example_strings = [
self.example_prompt.format(**example) for example in examples
]
# Create the overall template.
pieces = [self.prefix, *example_strings, self.suffix]
template = self.example_separator.join([piece for piece in pieces if piece])
# Format the template with the input variables.
return DEFAULT_FORMATTER_MAPPING[self.template_format](template, **kwargs)
@property
def _prompt_type(self) -> str:
"""Return the prompt type key."""
return "few_shot"
[docs] def dict(self, **kwargs: Any) -> Dict:
"""Return a dictionary of the prompt."""
if self.example_selector:
raise ValueError("Saving an example selector is not currently supported")
return super().dict(**kwargs)
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/prompts/few_shot.html
|
a14518eb61cc-0
|
Source code for langchain.prompts.chat
"""Chat prompt template."""
from __future__ import annotations
from abc import ABC, abstractmethod
from pathlib import Path
from typing import Any, Callable, List, Sequence, Tuple, Type, TypeVar, Union
from pydantic import BaseModel, Field
from langchain.memory.buffer import get_buffer_string
from langchain.prompts.base import BasePromptTemplate, StringPromptTemplate
from langchain.prompts.prompt import PromptTemplate
from langchain.schema import (
AIMessage,
BaseMessage,
ChatMessage,
HumanMessage,
PromptValue,
SystemMessage,
)
class BaseMessagePromptTemplate(BaseModel, ABC):
@abstractmethod
def format_messages(self, **kwargs: Any) -> List[BaseMessage]:
"""To messages."""
@property
@abstractmethod
def input_variables(self) -> List[str]:
"""Input variables for this prompt template."""
[docs]class MessagesPlaceholder(BaseMessagePromptTemplate):
"""Prompt template that assumes variable is already list of messages."""
variable_name: str
[docs] def format_messages(self, **kwargs: Any) -> List[BaseMessage]:
"""To a BaseMessage."""
value = kwargs[self.variable_name]
if not isinstance(value, list):
raise ValueError(
f"variable {self.variable_name} should be a list of base messages, "
f"got {value}"
)
for v in value:
if not isinstance(v, BaseMessage):
raise ValueError(
f"variable {self.variable_name} should be a list of base messages,"
f" got {value}"
)
return value
@property
def input_variables(self) -> List[str]:
"""Input variables for this prompt template."""
|
https://python.langchain.com/en/latest/_modules/langchain/prompts/chat.html
|
a14518eb61cc-1
|
"""Input variables for this prompt template."""
return [self.variable_name]
MessagePromptTemplateT = TypeVar(
"MessagePromptTemplateT", bound="BaseStringMessagePromptTemplate"
)
class BaseStringMessagePromptTemplate(BaseMessagePromptTemplate, ABC):
prompt: StringPromptTemplate
additional_kwargs: dict = Field(default_factory=dict)
@classmethod
def from_template(
cls: Type[MessagePromptTemplateT], template: str, **kwargs: Any
) -> MessagePromptTemplateT:
prompt = PromptTemplate.from_template(template)
return cls(prompt=prompt, **kwargs)
@classmethod
def from_template_file(
cls: Type[MessagePromptTemplateT],
template_file: Union[str, Path],
input_variables: List[str],
**kwargs: Any,
) -> MessagePromptTemplateT:
prompt = PromptTemplate.from_file(template_file, input_variables)
return cls(prompt=prompt, **kwargs)
@abstractmethod
def format(self, **kwargs: Any) -> BaseMessage:
"""To a BaseMessage."""
def format_messages(self, **kwargs: Any) -> List[BaseMessage]:
return [self.format(**kwargs)]
@property
def input_variables(self) -> List[str]:
return self.prompt.input_variables
class ChatMessagePromptTemplate(BaseStringMessagePromptTemplate):
role: str
def format(self, **kwargs: Any) -> BaseMessage:
text = self.prompt.format(**kwargs)
return ChatMessage(
content=text, role=self.role, additional_kwargs=self.additional_kwargs
)
class HumanMessagePromptTemplate(BaseStringMessagePromptTemplate):
def format(self, **kwargs: Any) -> BaseMessage:
text = self.prompt.format(**kwargs)
|
https://python.langchain.com/en/latest/_modules/langchain/prompts/chat.html
|
a14518eb61cc-2
|
text = self.prompt.format(**kwargs)
return HumanMessage(content=text, additional_kwargs=self.additional_kwargs)
class AIMessagePromptTemplate(BaseStringMessagePromptTemplate):
def format(self, **kwargs: Any) -> BaseMessage:
text = self.prompt.format(**kwargs)
return AIMessage(content=text, additional_kwargs=self.additional_kwargs)
class SystemMessagePromptTemplate(BaseStringMessagePromptTemplate):
def format(self, **kwargs: Any) -> BaseMessage:
text = self.prompt.format(**kwargs)
return SystemMessage(content=text, additional_kwargs=self.additional_kwargs)
class ChatPromptValue(PromptValue):
messages: List[BaseMessage]
def to_string(self) -> str:
"""Return prompt as string."""
return get_buffer_string(self.messages)
def to_messages(self) -> List[BaseMessage]:
"""Return prompt as messages."""
return self.messages
[docs]class BaseChatPromptTemplate(BasePromptTemplate, ABC):
[docs] def format(self, **kwargs: Any) -> str:
return self.format_prompt(**kwargs).to_string()
[docs] def format_prompt(self, **kwargs: Any) -> PromptValue:
messages = self.format_messages(**kwargs)
return ChatPromptValue(messages=messages)
[docs] @abstractmethod
def format_messages(self, **kwargs: Any) -> List[BaseMessage]:
"""Format kwargs into a list of messages."""
[docs]class ChatPromptTemplate(BaseChatPromptTemplate, ABC):
input_variables: List[str]
messages: List[Union[BaseMessagePromptTemplate, BaseMessage]]
@classmethod
def from_template(cls, template: str, **kwargs: Any) -> ChatPromptTemplate:
prompt_template = PromptTemplate.from_template(template, **kwargs)
|
https://python.langchain.com/en/latest/_modules/langchain/prompts/chat.html
|
a14518eb61cc-3
|
prompt_template = PromptTemplate.from_template(template, **kwargs)
message = HumanMessagePromptTemplate(prompt=prompt_template)
return cls.from_messages([message])
@classmethod
def from_role_strings(
cls, string_messages: List[Tuple[str, str]]
) -> ChatPromptTemplate:
messages = [
ChatMessagePromptTemplate(
prompt=PromptTemplate.from_template(template), role=role
)
for role, template in string_messages
]
return cls.from_messages(messages)
@classmethod
def from_strings(
cls, string_messages: List[Tuple[Type[BaseMessagePromptTemplate], str]]
) -> ChatPromptTemplate:
messages = [
role(prompt=PromptTemplate.from_template(template))
for role, template in string_messages
]
return cls.from_messages(messages)
@classmethod
def from_messages(
cls, messages: Sequence[Union[BaseMessagePromptTemplate, BaseMessage]]
) -> ChatPromptTemplate:
input_vars = set()
for message in messages:
if isinstance(message, BaseMessagePromptTemplate):
input_vars.update(message.input_variables)
return cls(input_variables=list(input_vars), messages=messages)
[docs] def format(self, **kwargs: Any) -> str:
return self.format_prompt(**kwargs).to_string()
[docs] def format_messages(self, **kwargs: Any) -> List[BaseMessage]:
kwargs = self._merge_partial_and_user_variables(**kwargs)
result = []
for message_template in self.messages:
if isinstance(message_template, BaseMessage):
result.extend([message_template])
elif isinstance(message_template, BaseMessagePromptTemplate):
rel_params = {
k: v
|
https://python.langchain.com/en/latest/_modules/langchain/prompts/chat.html
|
a14518eb61cc-4
|
rel_params = {
k: v
for k, v in kwargs.items()
if k in message_template.input_variables
}
message = message_template.format_messages(**rel_params)
result.extend(message)
else:
raise ValueError(f"Unexpected input: {message_template}")
return result
[docs] def partial(self, **kwargs: Union[str, Callable[[], str]]) -> BasePromptTemplate:
raise NotImplementedError
@property
def _prompt_type(self) -> str:
raise NotImplementedError
[docs] def save(self, file_path: Union[Path, str]) -> None:
raise NotImplementedError
By Harrison Chase
© Copyright 2023, Harrison Chase.
Last updated on Jun 02, 2023.
|
https://python.langchain.com/en/latest/_modules/langchain/prompts/chat.html
|
87e1e92e7d92-0
|
Source code for langchain.prompts.prompt
"""Prompt schema definition."""
from __future__ import annotations
from pathlib import Path
from string import Formatter
from typing import Any, Dict, List, Union
from pydantic import Extra, root_validator
from langchain.prompts.base import (
DEFAULT_FORMATTER_MAPPING,
StringPromptTemplate,
_get_jinja2_variables_from_template,
check_valid_template,
)
[docs]class PromptTemplate(StringPromptTemplate):
"""Schema to represent a prompt for an LLM.
Example:
.. code-block:: python
from langchain import PromptTemplate
prompt = PromptTemplate(input_variables=["foo"], template="Say {foo}")
"""
input_variables: List[str]
"""A list of the names of the variables the prompt template expects."""
template: str
"""The prompt template."""
template_format: str = "f-string"
"""The format of the prompt template. Options are: 'f-string', 'jinja2'."""
validate_template: bool = True
"""Whether or not to try validating the template."""
@property
def _prompt_type(self) -> str:
"""Return the prompt type key."""
return "prompt"
class Config:
"""Configuration for this pydantic object."""
extra = Extra.forbid
[docs] def format(self, **kwargs: Any) -> str:
"""Format the prompt with the inputs.
Args:
kwargs: Any arguments to be passed to the prompt template.
Returns:
A formatted string.
Example:
.. code-block:: python
prompt.format(variable1="foo")
"""
kwargs = self._merge_partial_and_user_variables(**kwargs)
|
https://python.langchain.com/en/latest/_modules/langchain/prompts/prompt.html
|
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