Make to_sparse_semi_structured_cutlass_sm9x ABI stable by jerryzh168 · Pull Request #3727 · pytorch/ao

jerryzh168 · 2026-01-26T23:12:16Z

Stack from ghstack (oldest at bottom):

-> Make to_sparse_semi_structured_cutlass_sm9x ABI stable #3727

Summary:
part of #3516

This PR also changed

Float8DynamicActivationFloat8WeightConfig(
  version=2,
  packing_format=Float8PackingFormat.SPARSE_CUTLASS,
  granularity=PerRow(),
),

to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0

Test Plan:
pip install -e . --no-build-isolation

Reviewers:

Subscribers:

Tasks:

Tags:

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

pytorch-bot · 2026-01-26T23:12:20Z

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/3727

📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

⏳ No Failures, 2 Pending

As of commit 82a9537 with merge base df0fde3 ():
💚 Looks good so far! There are no failures yet. 💚

This comment was automatically generated by Dr. CI and updates every 15 minutes.

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: 5d93562 Pull Request resolved: #3727

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: 49cc35b Pull Request resolved: #3727

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: cb749a0 Pull Request resolved: #3727

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: f789fce Pull Request resolved: #3727

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: c010f6a Pull Request resolved: #3727

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: 61821ab Pull Request resolved: #3727

…x ABI stable" Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: bcae01a Pull Request resolved: #3727

jerryzh168 · 2026-01-28T00:28:53Z

confirmed with Randy that it's fine that we change the availability of

Float8DynamicActivationFloat8WeightConfig(
                    version=2,
                    packing_format=Float8PackingFormat.SPARSE_CUTLASS,
                    granularity=PerRow(),
                ),

to be only available after 2.10.0 since they are using nightly / pytorch main

…x ABI stable" Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: 4b3c106 Pull Request resolved: #3727

…x ABI stable" Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: abed221 Pull Request resolved: #3727

…x ABI stable" Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: 2e7f58b Pull Request resolved: #3727

…x ABI stable" Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

…x ABI stable" Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: d1673ba Pull Request resolved: #3727

…x ABI stable" Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: 04460a4 Pull Request resolved: #3727

…x ABI stable" Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: 9fdfbd0 Pull Request resolved: #3727

jerryzh168 · 2026-01-28T23:55:34Z

@janeyx99 @mikaylagawarecki @andrewor14 please take a look, I will remove the debug print before landing

janeyx99

looked through the changes, lgtm overall, with some minor comments

janeyx99 · 2026-01-29T16:57:46Z

.../csrc/cuda/to_sparse_semi_structured_cutlass_sm9x/to_sparse_semi_structured_cutlass_sm9x.cuh


 #define OPERATOR_NAME "to_sparse_semi_structured_cutlass_sm9x"

+// Macro for checking CUDA kernel launch errors (replacement for C10_CUDA_KERNEL_LAUNCH_CHECK)


does STD_CUDA_KERNEL_LAUNCH_CHECK not work here?

janeyx99 · 2026-01-29T17:23:39Z

setup.py



+# Check if torch version is at least 2.10.0 (for stable ABI support)
+# util copied from torchao/utils.py


why not import the util

this is the code that is installing torchao, so it is assuming torchao is not installed yet, you mean just import the file? is that too confusing?

I think we want to keep setup.py as simple as possible. Importing torchao/utils.py might have side effects outside the scope of this file

janeyx99 · 2026-01-29T17:25:25Z

setup.py

+        )
+        ext_modules.append(
+            extension(
+                "torchao._C_cutlass_90a_stable",


Would you maintain an unstable version for torch 2.10 minus? It might be wise to enable users to build these kernels on an older torch still?

I think this is just a temporary thing to keep this PR and #3725 separate. After both PRs are landed there will be a single torchao._C_cutlass_90a and it will be the stable ABI version

yeah and we'll drop support for 2.10 minus afterwards

.../csrc/cuda/to_sparse_semi_structured_cutlass_sm9x/to_sparse_semi_structured_cutlass_sm9x.cuh

…x ABI stable" Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: 919efe5 Pull Request resolved: #3727

…x ABI stable" Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: 6e7a983 Pull Request resolved: #3727

andrewor14

Looks great, just one question I'll leave for Jane/Mikayla

andrewor14 · 2026-01-30T14:58:10Z

.../csrc/cuda/to_sparse_semi_structured_cutlass_sm9x/to_sparse_semi_structured_cutlass_sm9x.cuh

+  // Get device properties using raw CUDA API.
+  int device_id = W.get_device();
+  cudaDeviceProp device_prop;
+  cudaError_t err = cudaGetDeviceProperties(&device_prop, device_id);


@janeyx99 @mikaylagawarecki is this right? I had to do something more complicated in my PR: https://github.com/pytorch/ao/pull/3725/changes#r2746685516

(copied from the FA3 stable ABI PR: Dao-AILab/flash-attention#1791)

I believe the more complicated code in FA3 is needed for perf, so you cache the device properties and only call it once.

oh I see, I guess I can follow the same pattern, maybe just move that function to common.h?

setup.py

…x ABI stable" Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: fcaeb29 Pull Request resolved: #3727

…x ABI stable" Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 This PR also changed ``` Float8DynamicActivationFloat8WeightConfig( version=2, packing_format=Float8PackingFormat.SPARSE_CUTLASS, granularity=PerRow(), ), ``` to only be available after torch 2.10.0, because we made the ops used ABI stable, and stable ABI APIs are only available after 2.10.0 Test Plan: pip install -e . --no-build-isolation Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: 256c2ea Pull Request resolved: #3727

Make to_sparse_semi_structured_cutlass_sm9x ABI stable

7282131

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

meta-cla bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Jan 26, 2026

jerryzh168 added the module: not user facing Use this tag if you don't want this PR to show up in release notes label Jan 26, 2026

Update on "Make to_sparse_semi_structured_cutlass_sm9x ABI stable"

6904b15

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Update on "Make to_sparse_semi_structured_cutlass_sm9x ABI stable"

91d707e

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Update on "Make to_sparse_semi_structured_cutlass_sm9x ABI stable"

19300fa

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Update on "Make to_sparse_semi_structured_cutlass_sm9x ABI stable"

864de15

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Update on "Make to_sparse_semi_structured_cutlass_sm9x ABI stable"

f75c166

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

jerryzh168 added 2 commits January 27, 2026 16:11

Update base for Update on "Make to_sparse_semi_structured_cutlass_sm9…

c8bb8e5

…x ABI stable" Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

Update on "Make to_sparse_semi_structured_cutlass_sm9x ABI stable"

1c86c1b

Summary: part of #3516 Test Plan: pip install -e . --no-build-isolation seems doesn't work in B200, will try in H100 Reviewers: Subscribers: Tasks: Tags: [ghstack-poisoned]

jerryzh168 added 2 commits January 27, 2026 17:09

jerryzh168 added 2 commits January 27, 2026 17:34

jerryzh168 added 2 commits January 27, 2026 18:55

jerryzh168 added 2 commits January 27, 2026 19:32

jerryzh168 added 2 commits January 28, 2026 12:32

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jerryzh168 added 2 commits January 28, 2026 14:00

jerryzh168 marked this pull request as ready for review January 28, 2026 23:51

janeyx99 reviewed Jan 29, 2026

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jerryzh168 added 2 commits January 29, 2026 15:04

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jerryzh168 requested review from andrewor14 and janeyx99 January 30, 2026 01:30

andrewor14 approved these changes Jan 30, 2026

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jerryzh168 added 2 commits January 30, 2026 10:38

jerryzh168 added 2 commits January 30, 2026 10:41

jerryzh168 changed the base branch from gh/jerryzh168/27/base to main January 30, 2026 21:15

jerryzh168 merged commit bedf37e into main Jan 30, 2026
54 checks passed


		#define OPERATOR_NAME "to_sparse_semi_structured_cutlass_sm9x"

		// Macro for checking CUDA kernel launch errors (replacement for C10_CUDA_KERNEL_LAUNCH_CHECK)



		# Check if torch version is at least 2.10.0 (for stable ABI support)
		# util copied from torchao/utils.py

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/3727

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