Why it matters

BPT reduces memory bottleneck. Understanding shapes long-context.

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The architecture

Block-fused attention + FFN.

Iterate blocks in sequence.

BPT structureBlock chunksof sequenceFused attn + FFNper blockIterate blockssequentiallyFuses attention + FFN to save activations; combines with FlashAttention
BPT.
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How it works end to end

Reduces activation memory.

Fused block computation.

Combines with FlashAttention + Ring.