Auto-research with Codex: a 232× Faster GPU QR Kernel
A batched compact-Householder QR kernel is tricky on GPUs because Householder reflectors form a dependency chain. This post explains how blocked Householder QR with compact WY updates turns the trailing work into GEMM-shaped operations, and how an auto-research loop with Codex drove fast, correct kernel iterations to a 232× speedup over baseline.