AWS Lambda: No module named 'langchain'" despite including in layer

[saduri2004]

Title. I added a layer with the lang chain module as directed by AWS lamdba but am receiving the no module named error. Not sure what the error is

[dosubot[bot]]

Answer generated by a 🤖

Answer

I understand that you're encountering an issue with AWS Lambda not being able to find the 'langchain' module, despite having added it to a layer as per AWS Lambda's instructions. This error typically suggests that the function can't locate the module, which could be due to a few reasons such as incorrect installation in the layer, the layer not being properly associated with the function, or the module not being correctly packaged within the layer.

Let's try to troubleshoot this issue:

1. First, verify if the 'langchain' module is correctly installed in the layer. You can do this by navigating to the layer in AWS Lambda and checking the list of installed modules.

2. Next, ensure that the layer containing the 'langchain' module is correctly associated with your Lambda function. You can verify this by navigating to your Lambda function in AWS Lambda and checking the list of associated layers.

3. Lastly, confirm if the 'langchain' module is correctly packaged in the layer. The module should be packaged in a zip file with the following directory structure:

python/lib/python3.8/site-packages/

If the 'langchain' module is not correctly packaged, you can package it using the following commands:

pip install langchain -t ./python/lib/python3.8/site-packages/
zip -r langchain_layer.zip ./python

Afterwards, upload the 'langchain_layer.zip' file to AWS Lambda as a new layer and associate it with your Lambda function.

This is one potential solution to your problem. If you've followed these steps and the issue persists, it's possible that there might be a bug or an issue that's not immediately apparent. If you believe this is the case and it's a bug that could impact other users, I encourage you to make a pull request with the necessary fixes.

If my proposed solution contradicts your experience, I would suggest upgrading to the latest version of the 'langchain' module, as the issue might have been resolved in a more recent update.

Sources

• langchain/llms/amazon_api_gateway.py

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