Fix compile error in get_causal_mask_from_padding_mask

[SalmanMohammadi]

Context

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• fix a bug
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Changelog

What are the changes made in this PR?

Fixing a compile bug in get_causal_mask_from_padding_mask.

Repro on main

import torch
from torchtune.generation import get_causal_mask_from_padding_mask
get_causal_mask_from_padding_mask = torch.compile(get_causal_mask_from_padding_mask, fullgraph=True, backend="aot_eager")
get_causal_mask_from_padding_mask(torch.ones((10)).unsqueeze(0).bool())

torch._dynamo.exc.BackendCompilerFailed: backend='aot_eager' raised:
RuntimeError: aten::copy() Expected a value of type 'Tensor' for argument 'src' but instead found type 'bool'.
Position: 1
Value: True
Declaration: aten::copy(Tensor self, Tensor src, bool non_blocking=False) -> Tensor
Cast error details: Unable to cast True to Tensor

While executing %copy_ : [num_users=0] = call_method[target=copy_](args = (%diagonal, True), kwargs = {})
Original traceback:
  File "/Users/salmanmohammadi/projects/torchtune/torchtune/generation/_generation.py", line 150, in get_causal_mask_from_padding_mask
    mask.diagonal(dim1=1, dim2=2).copy_(True)


Set TORCH_LOGS="+dynamo" and TORCHDYNAMO_VERBOSE=1 for more information


You can suppress this exception and fall back to eager by setting:
    import torch._dynamo
    torch._dynamo.config.suppress_errors = True

This error does not occur on this branch.

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[pytorch-bot]

🔗 Helpful Links

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As of commit 8ea0473 with merge base c5db813 ():
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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 26.23%. Comparing base (dd348ce) to head (8ea0473).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
torchtune/generation/_generation.py	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (dd348ce) and HEAD (8ea0473). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (dd348ce)	HEAD (8ea0473)
	3	2

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1627       +/-   ##
===========================================
- Coverage   72.26%   26.23%   -46.03%     
===========================================
  Files         290      295        +5     
  Lines       14554    15079      +525     
===========================================
- Hits        10517     3956     -6561     
- Misses       4037    11123     +7086     

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