[python] Assemble LeRobot camera windows in parallel - #9850
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Purpose
Parallelize multi-camera temporal-window stacking with up to eight threads when PyTorch intra-op threads are set to one. Preserve output layout and sample isolation. Independent of #9836.
Paired local CPU benchmark (ALOHA, four cameras, 8-frame windows, batch 32, eight workers): 130.4 → 170.6 samples/s (+30.8%), median of three seeds; only
dataset.pydiffers between variants.Tests
88 tests and Flake8 passed. Real-video pixel equality, boundary/repeated samples and mutation isolation verified.