kevinthesun commented on a change in pull request #7018:
URL: https://github.com/apache/tvm/pull/7018#discussion_r534584859
##########
File path: include/tvm/topi/transform.h
##########
@@ -598,17 +598,69 @@ inline te::Tensor dynamic_strided_slice(const te::Tensor&
x, const te::Tensor& b
*
* \return A Tensor whose op member is the split operation
*/
-inline Tensor strided_slice(const Tensor& x, const Array<Integer>& begin,
const Array<Integer>& end,
- const Array<Integer>& strides, std::string
slice_mode = "end",
- std::string name = "T_strided_slice", std::string
tag = kInjective) {
+inline Tensor strided_slice(const Tensor& x, const Array<PrimExpr>& begin,
+ const Array<PrimExpr>& end, const Array<PrimExpr>&
strides,
+ std::string slice_mode = "end", std::string name =
"T_strided_slice",
+ std::string tag = kInjective) {
size_t src_tensor_dim = static_cast<size_t>(x->shape.size());
+ // Quick path for dynamic shape strided slice.
+ // This is for ease of use to dynamice strided slice in topi.
+ bool is_dyn = false;
+ for (size_t i = 0; i < src_tensor_dim; ++i) {
+ if (!IsConstInt(x->shape[i])) {
+ is_dyn = true;
+ break;
+ }
+ }
+ if (!is_dyn) {
+ for (size_t i = 0; i < begin.size(); ++i) {
+ if (begin[i].defined() && !IsConstInt(begin[i])) {
+ is_dyn = true;
+ break;
+ }
+ }
+ }
+ if (!is_dyn) {
+ for (size_t i = 0; i < end.size(); ++i) {
+ if (end[i].defined() && !IsConstInt(end[i])) {
+ is_dyn = true;
+ break;
+ }
+ }
+ }
+ if (!is_dyn) {
+ for (size_t i = 0; i < strides.size(); ++i) {
+ if (strides[i].defined() && !IsConstInt(strides[i])) {
+ is_dyn = true;
+ break;
+ }
+ }
+ }
+
+ Array<PrimExpr> out_shape;
+ if (is_dyn) {
+ for (size_t i = 0; i < src_tensor_dim; ++i) {
+ out_shape.push_back(indexdiv(end[i] - begin[i], strides[i]));
+ }
+ return te::compute(
+ out_shape,
+ [&](const Array<tvm::tir::Var>& indices) {
+ Array<PrimExpr> real_indices;
+ for (size_t i = 0; i < src_tensor_dim; ++i) {
+ real_indices.push_back(indices[i] * strides[i] + begin[i]);
+ }
+ return x(real_indices);
+ },
+ name, tag);
+ }
+
Review comment:
That ```dynamic_strided_slice``` has ```begin```, ```end``` and
```strides``` as tensors. As a result we can't use them to do PrimExpr
computation.
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