TaoLv commented on a change in pull request #17049: Fix operators lying about
their number of inputs
URL: https://github.com/apache/incubator-mxnet/pull/17049#discussion_r361410278
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File path: src/operator/nn/concat.cc
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@@ -394,6 +394,14 @@ CONCAT_FORWARD_ATTRS
.add_arguments(ConcatParam::__FIELDS__());
NNVM_REGISTER_OP(_backward_Concat)
+.set_num_inputs([](const NodeAttrs& attrs) {
+#if MXNET_USE_MKLDNN
Review comment:
`#if MXNET_USE_MKLDNN == 1`
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