eric-haibin-lin commented on a change in pull request #10371: [MXNET-263] [WIP]
Support for dot(dns, csr) = dns and dot(dns, csr.T) = dns on GPU
URL: https://github.com/apache/incubator-mxnet/pull/10371#discussion_r182912981
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File path: src/operator/tensor/dot-inl.cuh
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@@ -442,6 +445,105 @@ struct DotCsrRspDnsScalarKernel {
}
};
+/*!
+ * \brief GPU Kernel to scatter row id to corresponding entries
+ * \param tid global thread id
+ * \param csr_indptr indptr array of csr
+ * \param csr_rows array of row id of csr elements
+ * \param num_rows total number of rows in csr matrix
+ * Parallelization by output elements: 1 thread/row
+ */
+struct CsrRowScatterKernel {
+ template<typename CType>
+ __device__ __forceinline__ static void Map(int tid,
+ const CType* csr_indptr,
+ CType* csr_rows,
+ const nnvm::dim_t num_rows) {
+ if (tid < num_rows) {
+ for (CType i = csr_indptr[tid]; i < csr_indptr[tid+1]; ++i) {
+ csr_rows[i] = tid;
+ }
+ }
+ }
+};
+
+/*!
+ * \brief GPU Kernel of generation of transposed csr matrix
+ * \param tid global thread id
Review comment:
nit: remove line 472, 473
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