!pip install -q torch transformers transformers langchain sentence-transformers tqdm openpyxl openai pandas datasets langchain-community ragatouille

%reload_ext autoreload
%autoreload 2

from tqdm.auto import tqdm
import pandas as pd
from typing import Optional, List, Tuple
import json
import datasets

pd.set_option("display.max_colwidth", None)

from huggingface_hub import notebook_login

notebook_login()

ds = datasets.load_dataset("m-ric/huggingface_doc", split="train")

from langchain.text_splitter import RecursiveCharacterTextSplitter
from langchain.docstore.document import Document as LangchainDocument

langchain_docs = [LangchainDocument(page_content=doc["text"], metadata={"source": doc["source"]}) for doc in tqdm(ds)]


text_splitter = RecursiveCharacterTextSplitter(
    chunk_size=2000,
    chunk_overlap=200,
    add_start_index=True,
    separators=["\n\n", "\n", ".", " ", ""],
)

docs_processed = []
for doc in langchain_docs:
    docs_processed += text_splitter.split_documents([doc])

from huggingface_hub import InferenceClient


repo_id = "mistralai/Mixtral-8x7B-Instruct-v0.1"

llm_client = InferenceClient(
    model=repo_id,
    timeout=120,
)


def call_llm(inference_client: InferenceClient, prompt: str):
    response = inference_client.post(
        json={
            "inputs": prompt,
            "parameters": {"max_new_tokens": 1000},
            "task": "text-generation",
        },
    )
    return json.loads(response.decode())[0]["generated_text"]


call_llm(llm_client, "This is a test context")

QA_generation_prompt = """
Your task is to write a factoid question and an answer given a context.
Your factoid question should be answerable with a specific, concise piece of factual information from the context.
Your factoid question should be formulated in the same style as questions users could ask in a search engine.
This means that your factoid question MUST NOT mention something like "according to the passage" or "context".

Provide your answer as follows:

Output:::
Factoid question: (your factoid question)
Answer: (your answer to the factoid question)

Now here is the context.

Context: {context}\n
Output:::"""

import random

N_GENERATIONS = 10  # We intentionally generate only 10 QA couples here for cost and time considerations

print(f"Generating {N_GENERATIONS} QA couples...")

outputs = []
for sampled_context in tqdm(random.sample(docs_processed, N_GENERATIONS)):
    # Generate QA couple
    output_QA_couple = call_llm(llm_client, QA_generation_prompt.format(context=sampled_context.page_content))
    try:
        question = output_QA_couple.split("Factoid question: ")[-1].split("Answer: ")[0]
        answer = output_QA_couple.split("Answer: ")[-1]
        assert len(answer) < 300, "Answer is too long"
        outputs.append(
            {
                "context": sampled_context.page_content,
                "question": question,
                "answer": answer,
                "source_doc": sampled_context.metadata["source"],
            }
        )
    except:
        continue

display(pd.DataFrame(outputs).head(1))

question_groundedness_critique_prompt = """
You will be given a context and a question.
Your task is to provide a 'total rating' scoring how well one can answer the given question unambiguously with the given context.
Give your answer on a scale of 1 to 5, where 1 means that the question is not answerable at all given the context, and 5 means that the question is clearly and unambiguously answerable with the context.

Provide your answer as follows:

Answer:::
Evaluation: (your rationale for the rating, as a text)
Total rating: (your rating, as a number between 1 and 5)

You MUST provide values for 'Evaluation:' and 'Total rating:' in your answer.

Now here are the question and context.

Question: {question}\n
Context: {context}\n
Answer::: """

question_relevance_critique_prompt = """
You will be given a question.
Your task is to provide a 'total rating' representing how useful this question can be to machine learning developers building NLP applications with the Hugging Face ecosystem.
Give your answer on a scale of 1 to 5, where 1 means that the question is not useful at all, and 5 means that the question is extremely useful.

Provide your answer as follows:

Answer:::
Evaluation: (your rationale for the rating, as a text)
Total rating: (your rating, as a number between 1 and 5)

You MUST provide values for 'Evaluation:' and 'Total rating:' in your answer.

Now here is the question.

Question: {question}\n
Answer::: """

question_standalone_critique_prompt = """
You will be given a question.
Your task is to provide a 'total rating' representing how context-independant this question is.
Give your answer on a scale of 1 to 5, where 1 means that the question depends on additional information to be understood, and 5 means that the question makes sense by itself.
For instance, if the question refers to a particular setting, like 'in the context' or 'in the document', the rating must be 1.
The questions can contain obscure technical nouns or acronyms like Gradio, Hub, Hugging Face or Space and still be a 5: it must simply be clear to an operator with access to documentation what the question is about.

For instance, "What is the name of the checkpoint from which the ViT model is imported?" should receive a 1, since there is an implicit mention of a context, thus the question is not independant from the context.

Provide your answer as follows:

Answer:::
Evaluation: (your rationale for the rating, as a text)
Total rating: (your rating, as a number between 1 and 5)

You MUST provide values for 'Evaluation:' and 'Total rating:' in your answer.

Now here is the question.

Question: {question}\n
Answer::: """

print("Generating critique for each QA couple...")
for output in tqdm(outputs):
    evaluations = {
        "groundedness": call_llm(
            llm_client,
            question_groundedness_critique_prompt.format(context=output["context"], question=output["question"]),
        ),
        "relevance": call_llm(
            llm_client,
            question_relevance_critique_prompt.format(question=output["question"]),
        ),
        "standalone": call_llm(
            llm_client,
            question_standalone_critique_prompt.format(question=output["question"]),
        ),
    }
    try:
        for criterion, evaluation in evaluations.items():
            score, eval = (
                int(evaluation.split("Total rating: ")[-1].strip()),
                evaluation.split("Total rating: ")[-2].split("Evaluation: ")[1],
            )
            output.update(
                {
                    f"{criterion}_score": score,
                    f"{criterion}_eval": eval,
                }
            )
    except Exception as e:
        continue

>>> import pandas as pd

>>> pd.set_option("display.max_colwidth", None)

>>> generated_questions = pd.DataFrame.from_dict(outputs)

>>> print("Evaluation dataset before filtering:")
>>> display(
...     generated_questions[
...         [
...             "question",
...             "answer",
...             "groundedness_score",
...             "relevance_score",
...             "standalone_score",
...         ]
...     ]
... )
>>> generated_questions = generated_questions.loc[
...     (generated_questions["groundedness_score"] >= 4)
...     & (generated_questions["relevance_score"] >= 4)
...     & (generated_questions["standalone_score"] >= 4)
... ]
>>> print("============================================")
>>> print("Final evaluation dataset:")
>>> display(
...     generated_questions[
...         [
...             "question",
...             "answer",
...             "groundedness_score",
...             "relevance_score",
...             "standalone_score",
...         ]
...     ]
... )

>>> eval_dataset = datasets.Dataset.from_pandas(generated_questions, split="train", preserve_index=False)

eval_dataset = datasets.load_dataset("m-ric/huggingface_doc_qa_eval", split="train")

from langchain.docstore.document import Document as LangchainDocument

RAW_KNOWLEDGE_BASE = [
    LangchainDocument(page_content=doc["text"], metadata={"source": doc["source"]}) for doc in tqdm(ds)
]

from langchain.text_splitter import RecursiveCharacterTextSplitter
from transformers import AutoTokenizer


def split_documents(
    chunk_size: int,
    knowledge_base: List[LangchainDocument],
    tokenizer_name: str,
) -> List[LangchainDocument]:
    """
    Split documents into chunks of size `chunk_size` characters and return a list of documents.
    """
    text_splitter = RecursiveCharacterTextSplitter.from_huggingface_tokenizer(
        AutoTokenizer.from_pretrained(tokenizer_name),
        chunk_size=chunk_size,
        chunk_overlap=int(chunk_size / 10),
        add_start_index=True,
        strip_whitespace=True,
        separators=["\n\n", "\n", ".", " ", ""],
    )

    docs_processed = []
    for doc in knowledge_base:
        docs_processed += text_splitter.split_documents([doc])

    # Remove duplicates
    unique_texts = {}
    docs_processed_unique = []
    for doc in docs_processed:
        if doc.page_content not in unique_texts:
            unique_texts[doc.page_content] = True
            docs_processed_unique.append(doc)

    return docs_processed_unique

from langchain.vectorstores import FAISS
from langchain_community.embeddings import HuggingFaceEmbeddings
from langchain_community.vectorstores.utils import DistanceStrategy
import os


def load_embeddings(
    langchain_docs: List[LangchainDocument],
    chunk_size: int,
    embedding_model_name: Optional[str] = "thenlper/gte-small",
) -> FAISS:
    """
    Creates a FAISS index from the given embedding model and documents. Loads the index directly if it already exists.

    Args:
        langchain_docs: list of documents
        chunk_size: size of the chunks to split the documents into
        embedding_model_name: name of the embedding model to use

    Returns:
        FAISS index
    """
    # load embedding_model
    embedding_model = HuggingFaceEmbeddings(
        model_name=embedding_model_name,
        multi_process=True,
        model_kwargs={"device": "cuda"},
        encode_kwargs={"normalize_embeddings": True},  # set True to compute cosine similarity
    )

    # Check if embeddings already exist on disk
    index_name = f"index_chunk:{chunk_size}_embeddings:{embedding_model_name.replace('/', '~')}"
    index_folder_path = f"./data/indexes/{index_name}/"
    if os.path.isdir(index_folder_path):
        return FAISS.load_local(
            index_folder_path,
            embedding_model,
            distance_strategy=DistanceStrategy.COSINE,
        )

    else:
        print("Index not found, generating it...")
        docs_processed = split_documents(
            chunk_size,
            langchain_docs,
            embedding_model_name,
        )
        knowledge_index = FAISS.from_documents(
            docs_processed, embedding_model, distance_strategy=DistanceStrategy.COSINE
        )
        knowledge_index.save_local(index_folder_path)
        return knowledge_index

RAG_PROMPT_TEMPLATE = """
<|system|>
Using the information contained in the context,
give a comprehensive answer to the question.
Respond only to the question asked, response should be concise and relevant to the question.
Provide the number of the source document when relevant.
If the answer cannot be deduced from the context, do not give an answer.</s>
<|user|>
Context:
{context}
---
Now here is the question you need to answer.

Question: {question}
</s>
<|assistant|>
"""

from langchain_community.llms import HuggingFaceHub

repo_id = "HuggingFaceH4/zephyr-7b-beta"
READER_MODEL_NAME = "zephyr-7b-beta"
HF_API_TOKEN = ""

READER_LLM = HuggingFaceHub(
    repo_id=repo_id,
    task="text-generation",
    huggingfacehub_api_token=HF_API_TOKEN,
    model_kwargs={
        "max_new_tokens": 512,
        "top_k": 30,
        "temperature": 0.1,
        "repetition_penalty": 1.03,
    },
)

from ragatouille import RAGPretrainedModel
from langchain_core.vectorstores import VectorStore
from langchain_core.language_models.llms import LLM


def answer_with_rag(
    question: str,
    llm: LLM,
    knowledge_index: VectorStore,
    reranker: Optional[RAGPretrainedModel] = None,
    num_retrieved_docs: int = 30,
    num_docs_final: int = 7,
) -> Tuple[str, List[LangchainDocument]]:
    """Answer a question using RAG with the given knowledge index."""
    # Gather documents with retriever
    relevant_docs = knowledge_index.similarity_search(query=question, k=num_retrieved_docs)
    relevant_docs = [doc.page_content for doc in relevant_docs]  # keep only the text

    # Optionally rerank results
    if reranker:
        relevant_docs = reranker.rerank(question, relevant_docs, k=num_docs_final)
        relevant_docs = [doc["content"] for doc in relevant_docs]

    relevant_docs = relevant_docs[:num_docs_final]

    # Build the final prompt
    context = "\nExtracted documents:\n"
    context += "".join([f"Document {str(i)}:::\n" + doc for i, doc in enumerate(relevant_docs)])

    final_prompt = RAG_PROMPT_TEMPLATE.format(question=question, context=context)

    # Redact an answer
    answer = llm(final_prompt)

    return answer, relevant_docs

from langchain_core.language_models import BaseChatModel


def run_rag_tests(
    eval_dataset: datasets.Dataset,
    llm,
    knowledge_index: VectorStore,
    output_file: str,
    reranker: Optional[RAGPretrainedModel] = None,
    verbose: Optional[bool] = True,
    test_settings: Optional[str] = None,  # To document the test settings used
):
    """Runs RAG tests on the given dataset and saves the results to the given output file."""
    try:  # load previous generations if they exist
        with open(output_file, "r") as f:
            outputs = json.load(f)
    except:
        outputs = []

    for example in tqdm(eval_dataset):
        question = example["question"]
        if question in [output["question"] for output in outputs]:
            continue

        answer, relevant_docs = answer_with_rag(question, llm, knowledge_index, reranker=reranker)
        if verbose:
            print("=======================================================")
            print(f"Question: {question}")
            print(f"Answer: {answer}")
            print(f'True answer: {example["answer"]}')
        result = {
            "question": question,
            "true_answer": example["answer"],
            "source_doc": example["source_doc"],
            "generated_answer": answer,
            "retrieved_docs": [doc for doc in relevant_docs],
        }
        if test_settings:
            result["test_settings"] = test_settings
        outputs.append(result)

        with open(output_file, "w") as f:
            json.dump(outputs, f)

EVALUATION_PROMPT = """###Task Description:
An instruction (might include an Input inside it), a response to evaluate, a reference answer that gets a score of 5, and a score rubric representing a evaluation criteria are given.
1. Write a detailed feedback that assess the quality of the response strictly based on the given score rubric, not evaluating in general.
2. After writing a feedback, write a score that is an integer between 1 and 5. You should refer to the score rubric.
3. The output format should look as follows: \"Feedback: {{write a feedback for criteria}} [RESULT] {{an integer number between 1 and 5}}\"
4. Please do not generate any other opening, closing, and explanations. Be sure to include [RESULT] in your output.

###The instruction to evaluate:
{instruction}

###Response to evaluate:
{response}

###Reference Answer (Score 5):
{reference_answer}

###Score Rubrics:
[Is the response correct, accurate, and factual based on the reference answer?]
Score 1: The response is completely incorrect, inaccurate, and/or not factual.
Score 2: The response is mostly incorrect, inaccurate, and/or not factual.
Score 3: The response is somewhat correct, accurate, and/or factual.
Score 4: The response is mostly correct, accurate, and factual.
Score 5: The response is completely correct, accurate, and factual.

###Feedback:"""

from langchain.prompts.chat import (
    ChatPromptTemplate,
    HumanMessagePromptTemplate,
)
from langchain.schema import SystemMessage


evaluation_prompt_template = ChatPromptTemplate.from_messages(
    [
        SystemMessage(content="You are a fair evaluator language model."),
        HumanMessagePromptTemplate.from_template(EVALUATION_PROMPT),
    ]
)

from langchain.chat_models import ChatOpenAI

OPENAI_API_KEY = ""

eval_chat_model = ChatOpenAI(model="gpt-4-1106-preview", temperature=0, openai_api_key=OPENAI_API_KEY)
evaluator_name = "GPT4"


def evaluate_answers(
    answer_path: str,
    eval_chat_model,
    evaluator_name: str,
    evaluation_prompt_template: ChatPromptTemplate,
) -> None:
    """Evaluates generated answers. Modifies the given answer file in place for better checkpointing."""
    answers = []
    if os.path.isfile(answer_path):  # load previous generations if they exist
        answers = json.load(open(answer_path, "r"))

    for experiment in tqdm(answers):
        if f"eval_score_{evaluator_name}" in experiment:
            continue

        eval_prompt = evaluation_prompt_template.format_messages(
            instruction=experiment["question"],
            response=experiment["generated_answer"],
            reference_answer=experiment["true_answer"],
        )
        eval_result = eval_chat_model.invoke(eval_prompt)
        feedback, score = [item.strip() for item in eval_result.content.split("[RESULT]")]
        experiment[f"eval_score_{evaluator_name}"] = score
        experiment[f"eval_feedback_{evaluator_name}"] = feedback

        with open(answer_path, "w") as f:
            json.dump(answers, f)

if not os.path.exists("./output"):
    os.mkdir("./output")

for chunk_size in [200]:  # Add other chunk sizes (in tokens) as needed
    for embeddings in ["thenlper/gte-small"]:  # Add other embeddings as needed
        for rerank in [True, False]:
            settings_name = f"chunk:{chunk_size}_embeddings:{embeddings.replace('/', '~')}_rerank:{rerank}_reader-model:{READER_MODEL_NAME}"
            output_file_name = f"./output/rag_{settings_name}.json"

            print(f"Running evaluation for {settings_name}:")

            print("Loading knowledge base embeddings...")
            knowledge_index = load_embeddings(
                RAW_KNOWLEDGE_BASE,
                chunk_size=chunk_size,
                embedding_model_name=embeddings,
            )

            print("Running RAG...")
            reranker = RAGPretrainedModel.from_pretrained("colbert-ir/colbertv2.0") if rerank else None
            run_rag_tests(
                eval_dataset=eval_dataset,
                llm=READER_LLM,
                knowledge_index=knowledge_index,
                output_file=output_file_name,
                reranker=reranker,
                verbose=False,
                test_settings=settings_name,
            )

            print("Running evaluation...")
            evaluate_answers(
                output_file_name,
                eval_chat_model,
                evaluator_name,
                evaluation_prompt_template,
            )

import glob

outputs = []
for file in glob.glob("./output/*.json"):
    output = pd.DataFrame(json.load(open(file, "r")))
    output["settings"] = file
    outputs.append(output)
result = pd.concat(outputs)

result["eval_score_GPT4"] = result["eval_score_GPT4"].apply(lambda x: int(x) if isinstance(x, str) else 1)
result["eval_score_GPT4"] = (result["eval_score_GPT4"] - 1) / 4

average_scores = result.groupby("settings")["eval_score_GPT4"].mean()
average_scores.sort_values()

import plotly.express as px

scores = datasets.load_dataset("m-ric/rag_scores_cookbook", split="train")
scores = pd.Series(scores["score"], index=scores["settings"])

fig = px.bar(
    scores,
    color=scores,
    labels={
        "value": "Accuracy",
        "settings": "Configuration",
    },
    color_continuous_scale="bluered",
)
fig.update_layout(
    width=1000,
    height=600,
    barmode="group",
    yaxis_range=[0, 100],
    title="<b>Accuracy of different RAG configurations</b>",
    xaxis_title="RAG settings",
    font=dict(size=15),
)
fig.layout.yaxis.ticksuffix = "%"
fig.update_coloraxes(showscale=False)
fig.update_traces(texttemplate="%{y:.1f}", textposition="outside")
fig.show()