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improvement: fix chat prompt loading from config (#13818)

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Add loader for loading chat prompt from config file.

fixed: #13667

@efriis 
@baskaryan
This commit is contained in:
umair mehmood 2023-11-27 21:39:50 +05:00 committed by GitHub
parent 8a3e0c9afa
commit b3e08f9239
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1 changed files with 15 additions and 0 deletions
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15
libs/core/langchain_core/prompts/loading.py
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@ -8,6 +8,7 @@ import yaml
from langchain_core.output_parsers.string import StrOutputParser
from langchain_core.prompts.base import BasePromptTemplate
from langchain_core.prompts.chat import ChatPromptTemplate
from langchain_core.prompts.few_shot import FewShotPromptTemplate
from langchain_core.prompts.prompt import PromptTemplate
from langchain_core.utils import try_load_from_hub
@ -154,7 +155,21 @@ def _load_prompt_from_file(file: Union[str, Path]) -> BasePromptTemplate:
return load_prompt_from_config(config)
def _load_chat_prompt(config: Dict) -> ChatPromptTemplate:
"""Load chat prompt from config"""
messages = config.pop("messages")
template = messages[0]["prompt"].pop("template") if messages else None
config.pop("input_variables")
if not template:
raise ValueError("Can't load chat prompt without template")
return ChatPromptTemplate.from_template(template=template, **config)
type_to_loader_dict: Dict[str, Callable[[dict], BasePromptTemplate]] = {
"prompt": _load_prompt,
"few_shot": _load_few_shot_prompt,
"chat": _load_chat_prompt,
}