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Improve repeat using broadcasting and reshape (#318)

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Angelos Katharopoulos 2023-12-29 21:40:20 -08:00 committed by GitHub
parent 930b159885
commit a020a2d49d
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1 changed files with 10 additions and 9 deletions
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mlx/ops.cpp
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@ -735,17 +735,18 @@ array repeat(const array& arr, int repeats, int axis, StreamOrDevice s) {
return arr; return arr;
} }
std::vector<int> new_shape(arr.shape()); // Broadcast to (S_1, S_2, ..., S_axis, repeats, S_axis+1, ...)
new_shape[axis] *= repeats; std::vector<int> shape(arr.shape());
shape.insert(shape.begin() + axis + 1, repeats);
array out = expand_dims(arr, axis + 1, s);
out = broadcast_to(out, shape, s);
std::vector<array> repeated_arrays; // Reshape back into a contiguous array where S_axis is now S_axis * repeats
repeated_arrays.reserve(repeats); shape.erase(shape.begin() + axis + 1);
shape[axis] *= repeats;
out = reshape(out, shape, s);
for (int i = 0; i < repeats; ++i) { return out;
repeated_arrays.push_back(expand_dims(arr, -1, s));
}
array repeated = concatenate(repeated_arrays, axis + 1, s);
return reshape(repeated, new_shape, s);
} }
array repeat(const array& arr, int repeats, StreamOrDevice s) { array repeat(const array& arr, int repeats, StreamOrDevice s) {