# `Emily.Fast.Block`
[🔗](https://github.com/ausimian/emily/blob/1.0.0/lib/emily/fast/block.ex#L1)

Block-dispatch structs for `Emily.Fast.*` fused kernels.

Each `Emily.Fast.*` helper emits an `Nx.block/4` node carrying one
of these structs. `Emily.Backend` `block/4` pattern-matches on the
struct to call the matching `mx::fast::*` NIF; non-Emily backends
fall through to the default `fun` supplied by `Nx.block/4`, which
runs the composed-defn fallback baked into each helper.

Static configuration (eps, dims, scale, causal, …) is carried as
struct fields. Runtime tensors travel in the `Nx.block/4` args list.

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*Consult [api-reference.md](api-reference.md) for complete listing*