Runnable lambdas
The RunnableLambda class is a crucial component in a hybrid retrieval chain. Before you use it to execute a vector retriever, let's first practice using it to convert a Python function into an LCEL runnable.
The user-defined reverse() function takes a string and returns it in reverse order. Update the code to return the input string in reverse.
This exercise is part of the course
Graph RAG with LangChain and Neo4j
Exercise instructions
- Convert the
reverse()function into an LCEL runnable. - Call the
reverse_chainrunnable to reverse the string provided.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
def reverse(input):
return input[::-1]
# Convert reverse() into a runnable
reverse_chain = ____
# Reverse the input
output = reverse_chain.____("Hello, world!")
print(output)