bgawrych commented on code in PR #21004:
URL: https://github.com/apache/incubator-mxnet/pull/21004#discussion_r861494669
##########
src/operator/tensor/broadcast_reduce_op.h:
##########
@@ -1354,6 +1354,94 @@ struct direct_copy {
}
};
+template <typename IType, typename OType>
+void BroadcastCPU(const OpContext& ctx,
+ const std::vector<TBlob>& inputs,
+ const std::vector<OpReqType>& req,
+ const std::vector<TBlob>& outputs,
+ const mxnet::TShape& src_shape,
+ const mxnet::TShape& dst_shape,
+ ShapeAndStride aux_data) {
+ using namespace mshadow;
+ using namespace mshadow::expr;
+ using namespace mxnet_op;
+ constexpr size_t ELEMENTS_THRESHOLD = 256;
+ Stream<cpu>* s = ctx.get_stream<cpu>();
+
+ std::vector<size_t> elements_to_copy(aux_data.num_broadcast_axes);
+ std::vector<size_t> preaxis_dims(aux_data.num_broadcast_axes);
+ for (int ax = 0; ax < aux_data.num_broadcast_axes; ax++) {
+ index_t axis = aux_data.axes[ax];
+
+ elements_to_copy[ax] = 1;
+ for (int i = axis + 1; i < dst_shape.ndim(); i++) {
+ elements_to_copy[ax] *= dst_shape[i];
+ }
+ preaxis_dims[ax] = 1;
+ for (int i = axis - 1; i >= 0; i--) {
+ preaxis_dims[ax] *= src_shape[i];
+ }
+ }
+
+ // there is no need to check further axis's elements to copy as it for sure
will be larger
+ if (elements_to_copy[0] < ELEMENTS_THRESHOLD || !std::is_same<IType,
OType>::value) {
+ IType* src = static_cast<IType*>(inputs[0].dptr_);
+ OType* dst = static_cast<OType*>(outputs[0].dptr_);
+ mshadow::Shape<MXNET_SPECIAL_MAX_NDIM> in_shape;
+ mshadow::Shape<MXNET_SPECIAL_MAX_NDIM> out_shape;
+ for (int i = 0; i < MXNET_SPECIAL_MAX_NDIM; ++i) {
+ if (i < dst_shape.ndim()) {
+ in_shape[i] = src_shape[i];
+ out_shape[i] = src_shape[i];
Review Comment:
removed
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