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"""
A dedicated helper to manage templates and prompt building.
"""
import json
import os.path as osp
from typing import Union
class Prompter(object):
__slots__ = ("template", "_verbose")
def __init__(self, template_name: str = "", verbose: bool = False):
self._verbose = verbose
if not template_name:
# Enforce the default here, so the constructor can be called with '' and will not break.
template_name = "alpaca"
file_name = osp.join("templates", f"{template_name}.json")
if not osp.exists(file_name):
raise ValueError(f"Can't read {file_name}")
with open(file_name) as fp:
self.template = json.load(fp)
if self._verbose:
print(
f"Using prompt template {template_name}: {self.template['description']}"
)
def generate_prompt(
self,
instruction: str,
input: Union[None, str] = None,
label: Union[None, str] = None,
) -> str:
# returns the full prompt from instruction and optional input
# if a label (=response, =output) is provided, it's also appended.
if input:
res = self.template["prompt_input"].format(
instruction=instruction, input=input
)
else:
res = self.template["prompt_no_input"].format(
instruction=instruction
)
if label:
res = f"{res}{label}"
if self._verbose:
print(res)
return res
def get_response(self, output: str) -> str:
return output.split(self.template["response_split"])[1].strip()
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