reminisce commented on a change in pull request #11406: [MXNET-599] Partial
shape infer for Slice
URL: https://github.com/apache/incubator-mxnet/pull/11406#discussion_r198698555
##########
File path: src/operator/tensor/matrix_op-inl.h
##########
@@ -674,13 +675,23 @@ inline void SetSliceOpOutputDimSize(const index_t i,
const int b,
const int e, const int s,
TShape* oshape) {
if (s > 0) {
- CHECK_LT(b, e) << "slicing with begin=[" << i << "]=" << b << ", end[" <<
i << "]="
+ CHECK_LE(b, e) << "slicing with begin=[" << i << "]=" << b << ", end[" <<
i << "]="
<< e << ", and step[" << i << "]=" << s << " is invalid";
- (*oshape)[i] = (e - b - 1) / s + 1;
+ if (e == b) {
+ // for partial shape infer
+ (*oshape)[i] = 0;
+ } else {
+ (*oshape)[i] = (e - b - 1) / s + 1;
Review comment:
I think we should only fill in output shape dim size when the corresponding
input shape dim size is non-zero.
That is if input shape is (0, 20), begin=(0, 0), end=(5, 10), it should
return (0, 10), instead of (5, 10) as inferred output shape.
@sandeep-krishnamurthy Could you confirm?
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