[r/ML] [P] preflight, a pre-training validator for PyTorch I built after losing 3 days to label leakage

Summary

A developer created 'preflight,' a PyTorch pre-training validator, after losing three days to label leakage that caused a model to learn nothing. This CLI tool runs before training to catch silent issues like label leakage, NaNs, incorrect channel ordering, dead gradients, class imbalance, and VRAM estimation, offering ten checks to prevent wasted development time.

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