ImportError: undefined symbol

[HuangBugWei]

Hello,

Thank you for maintaining this repository! I really appreciate the work and effort that went into fast-plaid.
It seems to be the cleanest and most straightforward solution that meets my needs.

I followed the official installation instructions for fast-plaid. My environment is:

• PyTorch version: 2.6.0+cu124
• Python version: 3.10
  I installed PyTorch with: pip install https://download.pytorch.org/whl/cu124/torch-2.6.0%2Bcu124-cp310-cp310-linux_x86_64.whl

Then, following the official guidance, I installed fast-plaid: pip install fast-plaid==1.2.4.260

However, when I try to import fast-plaid:

import torch
from fast_plaid import search

I get the following error:
ImportError: /home/.../.local/lib/python3.10/site-packages/fast_plaid/fast_plaid_rust.cpython-310-x86_64-linux-gnu.so: undefined symbol: _ZN3c106detail14torchCheckFailEPKcS2_jRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE

I’m not sure how to resolve this issue. Could you please advise if this version of fast-plaid is compatible with PyTorch 2.6.0+cu124, or if there is a recommended workaround?

Thank you very much for your help!

[xandery-geek]

Same issue here!

[raphaelsty]

Hi @xandery-geek @HuangBugWei, I have been quite late to answer, please could you try with a more recent version of torch (2.8.0) for instance ? Otherwise could you try to build it from source ?

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
pip install git+https://github.com/lightonai/fast-plaid.git

[xandery-geek]

Hi @xandery-geek @HuangBugWei, I have been quite late to answer, please could you try with a more recent version of torch (2.8.0) for instance ? Otherwise could you try to build it from source ?

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
pip install git+https://github.com/lightonai/fast-plaid.git

I try to install torch==2.7.1 and fast-plaid==1.2.4.271. It works well for me.

[HuangBugWei]

Hi @raphaelsty ,

I’ve tried building from source (including handling the Rust setup), and the build completed successfully. However, I’m still running into the same issue when importing.
My current project depends on pytorch 2.6, just wondering, is switching pytorch versions the only option for now?

Thanks!

[raphaelsty]

Yes for now switching torch version is the only option but I will find a solution :)

[HuangBugWei]

Thanks for confirming!
Really appreciate your help and looking forward to your fix!