[GitHub] [tvm] codeislife99 commented on a change in pull request #7125: Sparse reshape op

[GitBox <gi...@apache.org>]

codeislife99 commented on a change in pull request #7125:
URL: https://github.com/apache/tvm/pull/7125#discussion_r545533821



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File path: include/tvm/topi/transform.h
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@@ -1386,6 +1386,85 @@ inline Array<Tensor> meshgrid(const Array<Tensor>& inputs, const std::string& in
   return result;
 }
 
+/*!
+ * \brief Compute new sparse indices and return them after the sparsereshape operation
+ *
+ * \param sparse_indices Indices where values of the dense tensor exist
+ * \param sparse_values Values at the above indices respectively
+ * \param prev_shape Old Shape of the sparse tensor corresponding to sparse_indices
+ * \param new_shape Desired Shape of the sparse tensor which will correspond to output
+ * \param name The name of the operation
+ * \param tag The tag to mark the operation
+ *
+ * \return A Tensor whose op member is the sparsereshape operation
+ */
+
+inline Array<Tensor> SparseReshape(const Tensor& sparse_indices, const Tensor& sparse_values,
+                                   const Tensor& prev_shape, const Tensor& new_shape,
+                                   const std::string name = "T_sparsereshape",
+                                   std::string tag = kInjective) {
+  Array<Tensor> result;
+  Array<PrimExpr> new_sparse_indices_shape{sparse_indices->shape[0], new_shape->shape[0]};
+  std::vector<PrimExpr> multipliers(GetConstInt(prev_shape->shape[0]), 1);
+  std::vector<PrimExpr> dividers(GetConstInt(new_shape->shape[0]), 1);
+
+  tvm::te::compute(Array<PrimExpr>{1}, [&](const Array<Var>& indices) {

Review comment:
       Yeah I was thinking of that too, but then since the value of multipliers depends on its later index, it might be a bit non trivial to computer over multipliers. Am I missing something ? I am open to pseudo-code ideas to make it more clean.  




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