Multiplying with identity matrix doesnt give same input matrix. Can anyone explain why?

[KFrank]

Hi Junaid!

@Junaid

the output and input values are not same after 3 to 4 decimal points of float type

This is probably the “TF32 bug.” This post has some details:

Considerable absolute error in torch.matmul

Hi Koramajin! Could this be the TF32 “bug?” What specific gpu are you using and does the issue go away if you set torch.backends.cuda.matmul.allow_tf32 = True? Edit: The above should read torch.backends.cuda.matmul.allow_tf32 = False True is the default for allow_tf32. The suggestion is to turn off TF32 which is done by setting allow_tf32 to False. Best. K. Frank

Do you get the right answer when running on your cpu? What gpu are
you using? Does torch.backends.cuda.matmul.allow_tf32 = False
fix your issue?

As an aside, please don’t post screenshots of textual information. Doing
so breaks accessibility, searchability, and copy-paste.

Best.

K. Frank