AttributeError: module 'torch' has no attribute '_foreach_lerp_'

facebookresearch / schedule_free

Schedule-Free Optimization in PyTorch

Apache License 2.0

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AttributeError: module 'torch' has no attribute '_foreach_lerp_' #26

Closed patriksimurka closed 5 months ago

patriksimurka commented 5 months ago

Hi, nice work! I'm trying to use this in my project, but I'm getting this:

    optimizer.step()
  File "/home/patriksimurka/miniconda3/envs/equiformer_v2/lib/python3.8/site-packages/torch/optim/optimizer.py", line 140, in wrapper
    out = func(*args, **kwargs)
  File "/home/patriksimurka/miniconda3/envs/equiformer_v2/lib/python3.8/site-packages/schedulefree/adamw_schedulefree.py", line 164, in step
    torch._foreach_lerp_(y, z, weight=ckp1)
AttributeError: module 'torch' has no attribute '_foreach_lerp_'

adefazio commented 5 months ago

Thanks for pointing out this bug! It will run if you set foreach=False. Older versions of pytorch don't support the faster foreach implementation. I need to add some code to detect this and fallback to the non-foreach version.