DickJC123 commented on a change in pull request #13749: Add NHWC layout support
to Pooling (cpu, gpu cuda, gpu cuDNN)
URL: https://github.com/apache/incubator-mxnet/pull/13749#discussion_r254103480
##########
File path: src/operator/nn/pooling.cc
##########
@@ -421,11 +463,16 @@ NNVM_REGISTER_OP(_backward_Pooling)
.set_attr<nnvm::FInplaceOption>(
"FInplaceOption",
[](const NodeAttrs &attrs) {
-#if MXNET_USE_CUDNN == 1
- return std::vector<std::pair<int, int> >();
-#else
- return std::vector<std::pair<int, int> >{{1, 0}};
+#if MXNET_USE_MKLDNN == 1 && MXNET_USE_CUDA == 0 && MXNET_USE_CUDNN == 0
Review comment:
Sorry for any confusion. Perhaps my comments in the code for FInplaceOption
speak to the issue more directly:
```
// Since this routine is not provided the cpu/gpu context info, only in
the case
// where CUDA and CUDNN implementations are not available can we be sure
the MKLDNN
// implementation will be employed. The MKLDNN FInplaceOptions are not
compatible
// with the other (i.e. cpu, cuda and cudnn) implementations.
```
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