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GPT4全部

GitHub:nomic-ai/gpt4all一个开源聊天机器人生态系统,基于大量 Clean Assistant 数据(包括代码、故事和对话)进行训练。

此示例介绍了如何使用 LangChain 与GPT4All模型。

%pip install --upgrade --quiet langchain-community gpt4all

导入 GPT4All

from langchain_community.llms import GPT4All
from langchain_core.prompts import PromptTemplate
API 参考:GPT4All | 提示模板

设置 Question 以传递给 LLM

template = """Question: {question}

Answer: Let's think step by step."""

prompt = PromptTemplate.from_template(template)

指定模型

要在本地运行,请下载兼容的 ggml 格式模型。

gpt4all 页面有一个有用的Model Explorer部分:

  • 选择感兴趣的模型
  • 使用 UI 下载并将.binlocal_path(如下所述)

有关更多信息,请访问 https://github.com/nomic-ai/gpt4all


此集成尚不支持通过.stream()方法。下面的示例使用回调处理程序,其中streaming=True:

local_path = (
"./models/Meta-Llama-3-8B-Instruct.Q4_0.gguf" # replace with your local file path
)
from langchain_core.callbacks import BaseCallbackHandler

count = 0


class MyCustomHandler(BaseCallbackHandler):
def on_llm_new_token(self, token: str, **kwargs) -> None:
global count
if count < 10:
print(f"Token: {token}")
count += 1


# Verbose is required to pass to the callback manager
llm = GPT4All(model=local_path, callbacks=[MyCustomHandler()], streaming=True)

# If you want to use a custom model add the backend parameter
# Check https://docs.gpt4all.io/gpt4all_python.html for supported backends
# llm = GPT4All(model=local_path, backend="gptj", callbacks=callbacks, streaming=True)

chain = prompt | llm

question = "What NFL team won the Super Bowl in the year Justin Bieber was born?"

# Streamed tokens will be logged/aggregated via the passed callback
res = chain.invoke({"question": question})
API 参考:BaseCallbackHandler
Token:  Justin
Token: Bieber
Token: was
Token: born
Token: on
Token: March
Token:
Token: 1
Token: ,
Token: