yangulei commented on a change in pull request #9996:
URL: https://github.com/apache/tvm/pull/9996#discussion_r810778133
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File path: include/tvm/topi/transform.h
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@@ -1608,7 +1608,11 @@ inline Tensor layout_transform(const Tensor& src, const
std::string& src_layout,
[&](const Array<Var>& dst_indices) {
Array<PrimExpr> dst_indices_expr(dst_indices.begin(),
dst_indices.end());
Array<PrimExpr> src_indices =
layout_converter.BackwardIndex(dst_indices_expr);
- return src(src_indices);
+ PrimExpr in_range = PrimExpr(1) > PrimExpr(0); // init with
dtype=bool and value=true
+ for (size_t i = 0; i < src.ndim(); ++i) {
+ in_range = in_range && (src_indices[i] < src->shape[i]);
+ }
+ return if_then_else(in_range, src(src_indices), tvm::cast(src->dtype,
PrimExpr(0)));
Review comment:
This is similar to zero padding. For example, when a tensor with shape=[
64, 3, 7, 7, ] is going to be transformed from "OIHW" to "OHWI16o2i", it's new
shape=[ 4, 7, 7, **2**, 16, **2**, ], which is bigger then the original tensor
in total.
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