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Add a functional test of frame stacking#15424

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blisc merged 11 commits intoNVIDIA-NeMo:mainfrom
rfejgin:magpietts_test_frame_stacking
Feb 26, 2026
Merged

Add a functional test of frame stacking#15424
blisc merged 11 commits intoNVIDIA-NeMo:mainfrom
rfejgin:magpietts_test_frame_stacking

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@rfejgin rfejgin commented Feb 24, 2026

Adding a functional test that verifies that frame stacked models are meeting performance expectations.

In the test, we use a model with a frame_stacking_factor of 4 since that tends to uncover more corner cases than lower frame stacking factors. Local transformer inference is enabled, as required for frame-stacked models.

A corresponding checkpoint has been uploaded to CI storage on Azure.

Also: loosened the SSIM threshold for the MoE Longform test since it was sporadically failing with an SSIM slightly below the target.

Signed-off-by: Fejgin, Roy <rfejgin@nvidia.com>
@rfejgin rfejgin marked this pull request as ready for review February 24, 2026 01:23
@rfejgin rfejgin changed the title Add a functional frame-stacking test Add a functional test of frame stacking Feb 24, 2026
Signed-off-by: Fejgin, Roy <rfejgin@nvidia.com>
Signed-off-by: Fejgin, Roy <rfejgin@nvidia.com>
(debugging a test failure)

Signed-off-by: Fejgin, Roy <rfejgin@nvidia.com>
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rfejgin commented Feb 25, 2026

Attention prior parameters need to be tuned for it to work well with 4x frame stacking. Disabling it for now for this test.

@rfejgin rfejgin marked this pull request as ready for review February 25, 2026 22:14
1. Enable attention prior in frame stacking test. Did some basic tuning to get the attention prior to be functional with this checkpoints.
2. Decrease the SSIM target for the longform MOE test since it was sporadically failing wiht SSIM just below the threshold.

Signed-off-by: Fejgin, Roy <rfejgin@nvidia.com>
XuesongYang
XuesongYang previously approved these changes Feb 26, 2026
@rfejgin rfejgin enabled auto-merge (squash) February 26, 2026 04:00
@rfejgin rfejgin disabled auto-merge February 26, 2026 05:21
It would need to be tuned further to work with 4x stacking.

Signed-off-by: Fejgin, Roy <rfejgin@nvidia.com>
@blisc blisc merged commit 15173d5 into NVIDIA-NeMo:main Feb 26, 2026
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4 participants