Langchain的安装 - AI创想 - Powered by Discuz!

import os
from langchain_core.messages import SystemMessage, HumanMessage
from langchain_core.output_parsers import StrOutputParser
from langchain_openai import ChatOpenAI
os.environ['http_proxy']=''
os.environ['https_proxy']=''
os.environ['LANGCHAIN_TRACING_V2']='TRUE'
os.environ['LANGCHAIN_API_KEY']=''# 创建模型
model = ChatOpenAI(model="gpt-3.5-turbo-1106")# 准备提示prompt
msg =[
SystemMessage(content="请将以下内容翻译成日语"),
HumanMessage(content="你好，请问你要到哪里去？")]
result = model.invoke(msg)print(result)# 创建返回数据的解析器
parser = StrOutputParser()
return_str = parser.invoke(result)print(return_str)# 得到链（把各个组件连接起来）
chain = model | parser
# 直接使用chain来调用print(chain.invoke(msg))

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content='こんにちは、どちらに行かれる予定ですか？' additional_kwargs={'refusal':None} response_metadata={'token_usage':{'completion_tokens':16,'prompt_tokens':35,'total_tokens':51,'completion_tokens_details':{'accepted_prediction_tokens':0,'audio_tokens':0,'reasoning_tokens':0,'rejected_prediction_tokens':0},'prompt_tokens_details':{'audio_tokens':0,'cached_tokens':0}},'model_name':'gpt-3.5-turbo-1106','system_fingerprint':'fp_e7d4a5f731','finish_reason':'stop','logprobs':None}id='run-36cc3912-c062-4525-8565-4a30ce2c1b4d-0' usage_metadata={'input_tokens':35,'output_tokens':16,'total_tokens':51,'input_token_details':{'audio':0,'cache_read':0},'output_token_details':{'audio':0,'reasoning':0}}
こんにちは、どちらに行かれる予定ですか？
こんにちは、どこに行く予定ですか？

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from langserve import RemoteRunnable
if __name__ =='__main__':
client = RemoteRunnable("http://127.0.0.1:8000/chain_demo")
result = client.invoke({'language':"italian",'text':"你好！"})print(result)

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Ciao!

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pip install langchain_community

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import os
from langchain_community.chat_message_histories import ChatMessageHistory
from langchain_core.messages import HumanMessage
from langchain_core.output_parsers import StrOutputParser
from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
from langchain_core.runnables import RunnableWithMessageHistory
from langchain_openai import ChatOpenAI
# vpn
os.environ['http_proxy']='127.0.0.1:7890'
os.environ['https_proxy']='127.0.0.1:7890'# 连接langchain
os.environ['LANGCHAIN_TRACING_V2']='TRUE'
os.environ['LANGCHAIN_PROJECT']='LangchainDemo_zhang'
os.environ['LANGCHAIN_API_KEY']='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'# 创建模型
model = ChatOpenAI(model="gpt-3.5-turbo")# 创建返回数据的解析器
parser = StrOutputParser()# 定义提示模板
prompt_template = ChatPromptTemplate.from_messages([('system','你是一个非常乐于助人的助手。用{language}尽可能回答你所能回答的所有问题。'),
MessagesPlaceholder(variable_name='my_msg')])# 得到链（把各个组件连接起来）(模板 | 模型 | 解析器）
chain = prompt_template | model | parser
# 保存聊天的历史记录
store ={}# 所有用户的聊天记录都保存到sotre。key：sessionID, value: 历史聊天记录对象# 此函数预期将接收到一个session_id并返回一个消息历史记录的对象defget_session_history(session_id:str):if session_id notin store:
store[session_id]= ChatMessageHistory()return store[session_id]
do_message = RunnableWithMessageHistory(
chain,
get_session_history,
input_messages_key='my_msg'# 每次聊天的时候发送msg的key)
config ={'configurable':{'session_id':'zhang317'}}# 给当前会话定义一个session_id# 第一轮聊天
resp1 = do_message.invoke({'my_msg':[HumanMessage(content="你好！我是张张。")],'language':'中文'},
config=config
)print(resp1)# 第二轮聊天
resp2 = do_message.invoke({'my_msg':[HumanMessage(content='我的名字是什么？')],'language':'中文'},
config=config
)print(resp2)

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print(resp1.content)print(resp2.content)

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你好，张张！有什么问题我可以帮助你解决呢？
您告诉我您的名字是张张。

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config ={'configurable':{'session_id':'bobo317'}}# 第三轮聊天，返回的数据是流式的for resp in do_message.stream({'my_msg':[HumanMessage(content='请给我讲一个愚公移山的故事。')],'language':'English'},
config=config):# 每一次resp都是一个tokenprint(resp, end='-')

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-Once- upon- a- time- in- ancient- China-,- there- was- a- man- named- Yu- Gong- who- lived- at- the- foot- of- two- large- mountains- that- blocked- his- path- and- made- it- difficult- for- his- family- to- travel-.- Determin-ed- to- make- life- easier- for- his- descendants-,- Yu- Gong- decided- to- move- the- mountains- out- of- the- way-.
-Yu- Gong- and- his- family- began- digging- at- the- mountains- with- their- bare- hands-,- but- progress- was- slow-.- A- wise- old- man- passing- by- saw- what- they- were- doing- and- told- Yu- Gong- that- moving- the- mountains- was- an- impossible- task- for- one- family-.- Und-eter-red-,- Yu- Gong- replied-,- "-I- may- not- be- able- to- finish- this- task- in- my- lifetime-,- but- my- children- and- grandchildren- can- continue- it-.- As- long- as- we- keep- working- together-,- the- mountains- will- eventually- be- moved-."
-Imp-ressed- by- Yu- Gong-'s- determination-,- the- wise- old- man- was- moved- by- his- spirit- and- decided- to- help-.- He- called- upon- the- gods-,- who- were- also- touched- by- Yu- Gong-'s- perseverance-.- The- gods- were- so- moved- that- they- sent- two- divine- beings- who- picked- up- the- mountains- and- carried- them- away-.
-From- then- on-,- the- saying- "-Yu- Gong- moves- mountains-"- became- a- popular- id-iom- in- Chinese- culture-,- symbol-izing- the- power- of- determination- and- persistence- in- overcoming- seemingly- ins-ur-mount-able- obstacles-.--

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