mirror of
https://github.com/hwchase17/langchain
synced 2024-11-18 09:25:54 +00:00
112 lines
3.7 KiB
Python
112 lines
3.7 KiB
Python
"""ChatModel wrapper which returns user input as the response.."""
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from io import StringIO
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from typing import Any, Callable, Dict, List, Mapping, Optional
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import yaml
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from langchain_core.callbacks import (
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CallbackManagerForLLMRun,
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)
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from langchain_core.language_models.chat_models import BaseChatModel
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from langchain_core.messages import (
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BaseMessage,
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HumanMessage,
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_message_from_dict,
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messages_to_dict,
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)
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from langchain_core.outputs import ChatGeneration, ChatResult
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from langchain_core.pydantic_v1 import Field
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from langchain_community.llms.utils import enforce_stop_tokens
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def _display_messages(messages: List[BaseMessage]) -> None:
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dict_messages = messages_to_dict(messages)
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for message in dict_messages:
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yaml_string = yaml.dump(
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message,
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default_flow_style=False,
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sort_keys=False,
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allow_unicode=True,
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width=10000,
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line_break=None,
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)
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print("\n", "======= start of message =======", "\n\n") # noqa: T201
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print(yaml_string) # noqa: T201
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print("======= end of message =======", "\n\n") # noqa: T201
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def _collect_yaml_input(
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messages: List[BaseMessage], stop: Optional[List[str]] = None
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) -> BaseMessage:
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"""Collects and returns user input as a single string."""
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lines = []
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while True:
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line = input()
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if not line.strip():
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break
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if stop and any(seq in line for seq in stop):
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break
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lines.append(line)
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yaml_string = "\n".join(lines)
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# Try to parse the input string as YAML
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try:
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message = _message_from_dict(yaml.safe_load(StringIO(yaml_string)))
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if message is None:
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return HumanMessage(content="")
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if stop:
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if isinstance(message.content, str):
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message.content = enforce_stop_tokens(message.content, stop)
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else:
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raise ValueError("Cannot use when output is not a string.")
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return message
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except yaml.YAMLError:
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raise ValueError("Invalid YAML string entered.")
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except ValueError:
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raise ValueError("Invalid message entered.")
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class HumanInputChatModel(BaseChatModel):
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"""ChatModel which returns user input as the response."""
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input_func: Callable = Field(default_factory=lambda: _collect_yaml_input)
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message_func: Callable = Field(default_factory=lambda: _display_messages)
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separator: str = "\n"
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input_kwargs: Mapping[str, Any] = {}
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message_kwargs: Mapping[str, Any] = {}
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@property
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def _identifying_params(self) -> Dict[str, Any]:
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return {
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"input_func": self.input_func.__name__,
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"message_func": self.message_func.__name__,
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}
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@property
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def _llm_type(self) -> str:
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"""Returns the type of LLM."""
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return "human-input-chat-model"
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def _generate(
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self,
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messages: List[BaseMessage],
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stop: Optional[List[str]] = None,
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run_manager: Optional[CallbackManagerForLLMRun] = None,
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**kwargs: Any,
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) -> ChatResult:
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"""
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Displays the messages to the user and returns their input as a response.
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Args:
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messages (List[BaseMessage]): The messages to be displayed to the user.
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stop (Optional[List[str]]): A list of stop strings.
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run_manager (Optional[CallbackManagerForLLMRun]): Currently not used.
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Returns:
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ChatResult: The user's input as a response.
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"""
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self.message_func(messages, **self.message_kwargs)
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user_input = self.input_func(messages, stop=stop, **self.input_kwargs)
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return ChatResult(generations=[ChatGeneration(message=user_input)])
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