129 lines
4.6 KiB
Python
129 lines
4.6 KiB
Python
import logging
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from typing import Iterable, List, Union
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from langchain.schema import BaseMessage
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from embedchain.config import ChatConfig, CustomAppConfig, OpenSourceAppConfig
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from embedchain.embedchain import EmbedChain
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from embedchain.models import Providers
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class CustomApp(EmbedChain):
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"""
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The custom EmbedChain app.
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Has two functions: add and query.
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adds(data_type, url): adds the data from the given URL to the vector db.
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query(query): finds answer to the given query using vector database and LLM.
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dry_run(query): test your prompt without consuming tokens.
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"""
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def __init__(self, config: CustomAppConfig = None):
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"""
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:param config: Optional. `CustomAppConfig` instance to load as configuration.
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:raises ValueError: Config must be provided for custom app
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"""
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if config is None:
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raise ValueError("Config must be provided for custom app")
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self.provider = config.provider
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if config.provider == Providers.GPT4ALL:
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from embedchain import OpenSourceApp
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# Because these models run locally, they should have an instance running when the custom app is created
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self.open_source_app = OpenSourceApp(config=config.open_source_app_config)
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super().__init__(config)
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def set_llm_model(self, provider: Providers):
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self.provider = provider
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if provider == Providers.GPT4ALL:
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raise ValueError(
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"GPT4ALL needs to be instantiated with the model known, please create a new app instance instead"
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)
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def get_llm_model_answer(self, prompt, config: ChatConfig):
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# TODO: Quitting the streaming response here for now.
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# Idea: https://gist.github.com/jvelezmagic/03ddf4c452d011aae36b2a0f73d72f68
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if config.stream:
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raise NotImplementedError(
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"Streaming responses have not been implemented for this model yet. Please disable."
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)
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try:
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if self.provider == Providers.OPENAI:
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return CustomApp._get_openai_answer(prompt, config)
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if self.provider == Providers.ANTHROPHIC:
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return CustomApp._get_athrophic_answer(prompt, config)
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if self.provider == Providers.VERTEX_AI:
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return CustomApp._get_vertex_answer(prompt, config)
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if self.provider == Providers.GPT4ALL:
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return self.open_source_app._get_gpt4all_answer(prompt, config)
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except ImportError as e:
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raise ImportError(e.msg) from None
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@staticmethod
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def _get_openai_answer(prompt: str, config: ChatConfig) -> str:
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from langchain.chat_models import ChatOpenAI
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logging.info(vars(config))
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chat = ChatOpenAI(
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temperature=config.temperature,
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model=config.model or "gpt-3.5-turbo",
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max_tokens=config.max_tokens,
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streaming=config.stream,
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)
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if config.top_p and config.top_p != 1:
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logging.warning("Config option `top_p` is not supported by this model.")
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messages = CustomApp._get_messages(prompt)
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return chat(messages).content
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@staticmethod
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def _get_athrophic_answer(prompt: str, config: ChatConfig) -> str:
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from langchain.chat_models import ChatAnthropic
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chat = ChatAnthropic(temperature=config.temperature, model=config.model)
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if config.max_tokens and config.max_tokens != 1000:
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logging.warning("Config option `max_tokens` is not supported by this model.")
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messages = CustomApp._get_messages(prompt)
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return chat(messages).content
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@staticmethod
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def _get_vertex_answer(prompt: str, config: ChatConfig) -> str:
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from langchain.chat_models import ChatVertexAI
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chat = ChatVertexAI(temperature=config.temperature, model=config.model, max_output_tokens=config.max_tokens)
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if config.top_p and config.top_p != 1:
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logging.warning("Config option `top_p` is not supported by this model.")
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messages = CustomApp._get_messages(prompt)
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return chat(messages).content
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@staticmethod
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def _get_messages(prompt: str) -> List[BaseMessage]:
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from langchain.schema import HumanMessage, SystemMessage
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return [SystemMessage(content="You are a helpful assistant."), HumanMessage(content=prompt)]
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def _stream_llm_model_response(self, response):
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"""
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This is a generator for streaming response from the OpenAI completions API
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"""
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for line in response:
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chunk = line["choices"][0].get("delta", {}).get("content", "")
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yield chunk
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