Adding VJP for gated delta net. - #4565
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tpegolotti
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September 28, 2026 21:25
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Adding VJP kernels for the gated delta net. This PR continues the work started in #4020.
Two kernels are added, one for the sequential case (pure metal kernel) and one for the chunked case (using neural accelerator).
Performance
The benchmark sweeps the Gated Delta backward over batch sizes 1, 4 and 8 and sequence lengths from 8 to 4096, at Hk=16, Hv=32, Dk=Dv=128, comparing the sequential kernel, the chunked NAX kernel and the ops fallback.
The chunked kernel is 1.4x to 6.3x faster than the sequential one and 9x to 79x faster than the fallback.