samskalicky commented on a change in pull request #17569: Adding sparse support
to MXTensor for custom operators
URL: https://github.com/apache/incubator-mxnet/pull/17569#discussion_r387405083
##########
File path: include/mxnet/lib_api.h
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@@ -229,20 +241,75 @@ enum MXReturnValue {
MX_SUCCESS = 1,
};
+// For sparse input, read/write the data from NDarray via pointers.
+struct MXInSparse {
+ // Pointer to data.
+ void *data{nullptr};
+ // length of (non-zero) data.
+ int64_t data_len;
+
+ // To store aux data for sparse.
+ // For CSR, indices stores the col index of non-zero values.
+ // For row sparse, indices store row index of rows which have non-zero
values.
+ int64_t* indices;
+ int64_t indices_len;
+
+ // For CSR, indptr gives the start and end index of data for each row.
+ // For row sparse, indptr is empty.
+ int64_t* indptr;
+ int64_t indptr_len;
+
+ void set(void *data_ptr, const int64_t* dims, int ndims, void *idx,
+ int64_t num_idx, void *idx_ptr = nullptr, int64_t num_idx_ptr = 0) {
+ data = data_ptr;
+ // If CSR, num of non-zero value is num_idx,
+ // If row sparse, num of value is num_idx * width.
+ data_len = idx_ptr ? num_idx : num_idx * dims[1];
+
+ indices = (int64_t*)idx;
+ indices_len = num_idx;
+
+ if(idx_ptr) {
+ indptr = (int64_t*)idx_ptr;
Review comment:
lets initialize `indptr` to nullptr so that its set to some value for
rowsparse
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