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Mojo function

reduce_argmin

def reduce_argmin[dtype: DType, InputFn: def[width: Int, alignment: Int, rank: Int](IndexList[rank]) -> SIMD[dtype, width] & RegisterPassable & ImplicitlyCopyable, OutputFn: def[width: SIMDLength, rank: Int](IndexList[rank], SIMD[DType.int64, width]) -> None & RegisterPassable & ImplicitlyCopyable, /, target: StringSpan[ImmStaticOrigin], *, reduce_dim: Int](input_fn: InputFn, output_fn: OutputFn, input_shape: Coord, context: Optional[DeviceContext] = None) where (eq InputFn.dtype, dtype)

Finds the argmin along reduce_dim via the Row layer: one ArgMin phase (native dtype, lower index wins ties) plus a per-row emit of the int64 index.