about LangChain, Anthropic, or Other:chain = PromptTemplate.from_template("""Given the user question below, classify it as either being about `LangChain`, `Anthropic`, or `Other`.                                     Do not respond with more than one word.<question>{question}</question>Classification:""") | ChatAnthropic() | StrOutputParser()chain.invoke({"question": "how do I call Anthropic?"})    ' Anthropic'Now, let's create three sub chains:langchain_chain = PromptTemplate.from_template("""You are an expert in langchain. \Always answer questions starting with "As Harrison Chase told me". \Respond to the following question:Question: {question}Answer:""") | ChatAnthropic()anthropic_chain = PromptTemplate.from_template("""You are an expert in anthropic. \Always answer questions starting with "As Dario Amodei told me". \Respond to the following question:Question: {question}Answer:""") | ChatAnthropic()general_chain = PromptTemplate.from_template("""Respond to the following question:Question: {question}Answer:""") | ChatAnthropic()from langchain.schema.runnable import RunnableBranchbranch = RunnableBranch(  (lambda x: "anthropic" in x["topic"].lower(), anthropic_chain),  (lambda x: "langchain" in x["topic"].lower(), langchain_chain),  general_chain)full_chain = {    "topic": chain,    "question": lambda x: x["question"]} | branchfull_chain.invoke({"question": "how do I use Anthropic?"})    AIMessage(content=" As Dario Amodei told me, here are some ways to use Anthropic:\n\n- Sign up for an account on Anthropic's website to access tools like Claude, Constitutional AI, and Writer. \n\n- Use Claude for tasks like email generation, customer service chat, and QA. Claude can understand natural language prompts and provide helpful responses.\n\n- Use Constitutional AI if you need an AI assistant that is harmless, honest, and helpful. It is designed to be safe and aligned with human values.\n\n- Use Writer to generate natural language content for things like marketing copy,
This notebook covers how to do routing in the LangChain Expression Language.
This notebook covers how to do routing in the LangChain Expression Language. ->: about LangChain, Anthropic, or Other:chain = PromptTemplate.from_template("""Given the user question below, classify it as either being about `LangChain`, `Anthropic`, or `Other`.                                     Do not respond with more than one word.<question>{question}</question>Classification:""") | ChatAnthropic() | StrOutputParser()chain.invoke({"question": "how do I call Anthropic?"})    ' Anthropic'Now, let's create three sub chains:langchain_chain = PromptTemplate.from_template("""You are an expert in langchain. \Always answer questions starting with "As Harrison Chase told me". \Respond to the following question:Question: {question}Answer:""") | ChatAnthropic()anthropic_chain = PromptTemplate.from_template("""You are an expert in anthropic. \Always answer questions starting with "As Dario Amodei told me". \Respond to the following question:Question: {question}Answer:""") | ChatAnthropic()general_chain = PromptTemplate.from_template("""Respond to the following question:Question: {question}Answer:""") | ChatAnthropic()from langchain.schema.runnable import RunnableBranchbranch = RunnableBranch(  (lambda x: "anthropic" in x["topic"].lower(), anthropic_chain),  (lambda x: "langchain" in x["topic"].lower(), langchain_chain),  general_chain)full_chain = {    "topic": chain,    "question": lambda x: x["question"]} | branchfull_chain.invoke({"question": "how do I use Anthropic?"})    AIMessage(content=" As Dario Amodei told me, here are some ways to use Anthropic:\n\n- Sign up for an account on Anthropic's website to access tools like Claude, Constitutional AI, and Writer. \n\n- Use Claude for tasks like email generation, customer service chat, and QA. Claude can understand natural language prompts and provide helpful responses.\n\n- Use Constitutional AI if you need an AI assistant that is harmless, honest, and helpful. It is designed to be safe and aligned with human values.\n\n- Use Writer to generate natural language content for things like marketing copy,