Mojo function

gather_reduce

gather_reduce[dtype: DType, gather_axis: Int, reduce_axis: Int, simd_width: Int, reduce_fn: fn[dtype: DType, width: Int](SIMD[dtype, width], SIMD[dtype, width]) -> SIMD[dtype, width]](output: TileTensor[dtype, LayoutType, origin, address_space=address_space, linear_idx_type=linear_idx_type, element_shape_types=element_shape_types], input: TileTensor[dtype, LayoutType, origin, address_space=address_space, linear_idx_type=linear_idx_type, element_shape_types=element_shape_types], indices: TileTensor[DType.int32, LayoutType, origin, address_space=address_space, linear_idx_type=linear_idx_type, element_shape_types=element_shape_types], reduce_init: Scalar[dtype])

Computes output[i, j, k] = input[indices[i, j], k] and simultaneously reduces the output across axis 1 to produce output[i, k].

The motivating use-case for this is multi-hot embeddings in recommender models. This provides similar functionality to Torch's EmbeddingBag layer. In that context, i is the batch dimension, j is the multi-hot dimension, and k is the embedding dimension.

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