Snider fa08ed1e2a test(metal): validate gradient checkpointing with real model (Phase 3) ... Checkpoint() wraps forward pass to recompute activations during backward, trading compute for memory. Verified with Gemma3-1B LoRA training: produces correct gradients (loss 7.15→7.08, matches non-checkpointed initial loss). Unit test confirms gradient correctness on simple function (sum(x^2), grad=[2,4,6]). Co-Authored-By: Virgil <virgil@lethean.io> Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>		2026-02-19 23:11:15 +00:00
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metal	test(metal): validate gradient checkpointing with real model (Phase 3)	2026-02-19 23:11:15 +00:00