ModuleNotFoundError: No module named 'langchain.retrievers'

[mic-de-stefano]

I just tried to use RAGatouille but as soon as I import ragatouille I receive the following error:

ModuleNotFoundError: No module named 'langchain.retrievers'

The issue is that in the latest LangChain versions the langchain.retrievers module does not exist.
RAGatouille does not clearly specify which is the langchain version to use.
I'm using uv to manage my project and the latest langchain version is downloaded.

You should upgrade your imports.

Can you fix, please?

[tsjshg]

I've gotten the same error, and I've tried to fix it but I gave up.
I found the alternative for RAGatouille, PyLate.
The following sample code is very concise and working without errors.
https://huggingface.co/LiquidAI/LFM2-ColBERT-350M

@mic-de-stefano Please try it.

[mic-de-stefano]

@tsjshg thank you very much for your advice. I've not tried your code, because meanwhile I've found a valid alternative too: LanceDB.
I report here my solution for whoever will read this post.
Into the LanceDB user guide, at the section named as Embedding Data it is shown that when you choose the huggingface provider the default model is colbert-ir/colbertv2.0. Obviously, you can choose any of the embedders provided by HuggingFace.
I tried this solution and it works. I tried this because I already knew how to use LanceDB but I did not know I could have used colbert-ir/colbertv2.0 when I opened this issue.

[cserpell]

I faced the same issue and I fixed it fixing the dependencies version, look at #276 .

[J040]

We need to replace langchain.retrievers with langchain_classic.retrievers, everywhere that there is a langchain.retrievers. Most of the not supported code is now on the langchain_classic.

Basically on:
.../venv/lib/python3.12/site-packages/ragatouille/integrations/_langchain.py
.../venv/lib/python3.12/site-packages/ragatouille/RAGPretrainedModel.py