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Flash Hog
This repo contains the code for Flash Higher-Order-Gradients, aka. Flash Hog. This kernel achieves around a 3.7x speedup over an XLA optimized kernel, with linear memory scaling instead of quadratic scaling.
Installation
TODO
Method
Flash Hog does 4 recomputation passes to avoid any atomics or saving any intermediary tensors of shape (N_Q, N_K).
This shakes out to be thread-wise tiling across Q in 3 passes first, once to compute dd, then once for b, then once for both dQ' and ddO.
Finally we do another pass tiled over K, producing dK' and dV'.
The equations we implement are the following:
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