Laith Sakka 7cfd054075 [attempt 2] Compute contiguity symbolically to avoid dde, and introduce c++ sym_is_contiguous (#157472) ...

Summary:
When we compute contiguity for a tensor with dynamic shapes we first:
1) Try to compute it without guarding.
2) If all shapes hinted, compute it with potentially adding guards.
3) if any input is not hinted, compute it symbolically.

sym_is_contiguous return a SymBool that is then either evaluated or guard_or_false can be called
on it to avoid data dependent errors.

ex:
 bool is_contiguous = input.sym_is_contiguous().guard_or_false(__FILE__, __LINE__);
is_contiguous_or_false is a helper function that does that.

In this PR I only handle default contiguity, will follow up with changes for other formats like  channel_last .
We use this patter in this PR for several locations to avoid DDEs.

Test Plan:
contbuild & OSS CI,

Rollback Plan:

Reviewed By: malfet

Differential Revision: D77639021

Pull Request resolved: https://github.com/pytorch/pytorch/pull/157472
Approved by: https://github.com/aorenste

2025-07-02 23:12:29 +00:00

..

backend

Remove unneeded std::make_optional (#141567)

2024-11-28 00:05:21 +00:00

core

[attempt 2] Compute contiguity symbolically to avoid dde, and introduce c++ sym_is_contiguous (#157472)

2025-07-02 23:12:29 +00:00

generated

Rename tools/codegen to torchgen (#76275)

2022-04-25 01:38:06 +00:00

python

[BE][7/16] fix typos in torch/ (torch/csrc/) (#156317)

2025-06-23 02:57:41 +00:00

ts_backend

[BE][7/16] fix typos in torch/ (torch/csrc/) (#156317)

2025-06-23 02:57:41 +00:00

test_mnist.py

[BE][Easy][17/19] enforce style for empty lines in import segments in torch/[a-c]*/ and torch/[e-n]*/ (#129769)

2024-08-04 10:24:09 +00:00

tutorial.md

[BE][7/16] fix typos in torch/ (torch/csrc/) (#156317)

2025-06-23 02:57:41 +00:00