[Solved] What is the likely cause of the error in this code snippet? seq_chain = SequentialChain(chains=[chain1, chain2], input_variables=['input']) result = seq_chain.run({'input': 'data'}) | LangChain

LangChain - Chains and LCEL

What is the likely cause of the error in this code snippet?

seq_chain = SequentialChain(chains=[chain1, chain2], input_variables=['input'])
result = seq_chain.run({'input': 'data'})

AThe chains list must contain only one chain for SequentialChain to work.

BThe input_variables list does not match the expected inputs of all chains in the sequence.

CThe run method requires no arguments when using SequentialChain.

DSequentialChain cannot accept dictionaries as input to run.

Step-by-Step Solution

Solution:

Step 1: Check input_variables
The input_variables parameter must include all inputs required by the first chain.
Step 2: Verify chain inputs
If chain2 expects inputs not provided or mismatched keys, an error occurs.
Step 3: Analyze options
The input_variables list does not match the expected inputs of all chains in the sequence. correctly identifies input_variables mismatch as the cause.
Final Answer:
The input_variables list does not match the expected inputs of all chains in the sequence. -> Option B
Quick Check:
Input keys must align with chain requirements [OK]

Quick Trick: Ensure input_variables match all chain input keys [OK]

Common Mistakes:

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