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FuseAttentionBlock

rlx_opt

Struct FuseAttentionBlock 

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pub struct FuseAttentionBlock;
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Fuses matmul(QKV) → narrow(Q,K,V) → [rope] → attention → matmul(out) into a single FusedAttentionBlock when batch*seq is small.

The optimizer auto-detects batch size from graph input shapes. For small inputs (batch*seq ≤ 64), intermediate tensors fit in L1 cache, making a monolithic kernel faster than separate BLAS calls.

Threshold is configurable via RLX_FUSE_ATTN_THRESHOLD (default: 64).

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impl Pass for FuseAttentionBlock

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fn name(&self) -> &str

Human-readable name for logging.
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fn run(&self, graph: Graph) -> Graph

Transform the graph. Returns a new graph (or the same if no changes).

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