ThriftAttention recovers 89.1% of the FP16 quality gap versus pure FP4 attention by running only 5% of query-key blocks in FP16 on long-context benchmarks.
For a sequence withn=⌊L/64⌋key blocks, the integer top-kis chosen by (kn−k(k−1)/2)/(n(n+ 1)/2)≈f, rounded and clamped to[1, n]
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ThriftAttention: Selective Mixed Precision for Long-Context FP4 Attention
ThriftAttention recovers 89.1% of the FP16 quality gap versus pure FP4 attention by running only 5% of query-key blocks in FP16 on long-context benchmarks.