openrknn: zero-initialize activation BO - #90
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The activation BO may contain stale data from previous DMA allocations. Without zeroing, the NPU reads garbage from activation offsets before any task writes to them (e.g., scratch tensor), causing non-deterministic output across different init sessions. Verified: consecutive runs now produce identical output (cosine=1.0). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Zero-initialize the activation BO after allocation. Without this, stale DMA data causes non-deterministic NPU output across different init sessions.
Verified: consecutive runs now produce identical output (cosine=1.0 between runs). Previously run0 vs run2 had only cos=0.87.
Test plan
🤖 Generated with Claude Code