haojin2 commented on a change in pull request #11024: concat of CSR NDArrays on
first dimension
URL: https://github.com/apache/incubator-mxnet/pull/11024#discussion_r192551908
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File path: src/operator/nn/concat-inl.h
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@@ -154,6 +154,82 @@ void ConcatGradCompute(const nnvm::NodeAttrs& attrs,
const OpContext& ctx,
});
}
+
+struct concat_csr_first_dim {
+ // i is the i-th row of the output ndarray
+ template<typename DType, typename RType, typename IType>
+ MSHADOW_XINLINE static void Map(int i, const OpReqType req,
+ DType* out_data, const DType* in_data,
+ RType* out_indptr, const RType* in_indptr,
+ IType* out_idx, const IType* in_idx,
+ const nnvm::dim_t indptr_offset,
+ const nnvm::dim_t idx_offset) {
+ if (i == 0) out_indptr[0] = 0;
+ out_indptr[i+1+indptr_offset] = in_indptr[i+1] + idx_offset;
+ for (nnvm::dim_t j = in_indptr[i]; j < in_indptr[i+1]; ++j) {
+ KERNEL_ASSIGN(out_idx[j+idx_offset], req, in_idx[j]);
+ KERNEL_ASSIGN(out_data[j+idx_offset], req, in_data[j]);
+ }
+ }
+};
+
+
+
Review comment:
nit: too many blank lines here
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