Fix InStereo2k disparity scale

[Marchematics]

Fix InStereo2k disparity scale.

[pytorch-bot]

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[Copilot]

Pull request overview

Fixes the scaling applied when decoding InStereo2k disparity PNGs so the returned disparity values are in the correct units.

Changes:

• Update InStereo2k disparity decoding scale factor from / 1024.0 to / 100.0.
• Add a regression test that writes a known 16-bit disparity PNG value and verifies the decoded disparity equals 1.0.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
torchvision/datasets/_stereo_matching.py	Correct InStereo2k disparity normalization factor during PNG decoding.
test/test_datasets.py	Add regression test validating InStereo2k disparity scaling.

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