ZhennanQin edited a comment on issue #13697: [MKLDNN] Enable signed int8 support for convolution. URL: https://github.com/apache/incubator-mxnet/pull/13697#issuecomment-448973617 @marcoabreu Looks like CI has trouble to build this PR. Some builds failed to compile this line https://github.com/apache/incubator-mxnet/blob/84131807d67bb6a256b78cd75bb12a274c22347b/include/mxnet/tensor_blob.h#L290 with `comparison between signed and unsigned integer expressions`. But this PR doesn't touch that part,~~and looking into the code, both sides are returning size_t, which should be all same~~. Another prove is, clang can build pass with `-Wsign-compare`, which indicated that the gcc build has some problem. Can you have a look? Thanks. **Update**: I found the reason, the right side returns from mshadow::Shape<dimension>::Size(void), which is index_t. https://github.com/dmlc/mshadow/blob/696803bd7723ade8230af878460d96c68a550fbc/mshadow/tensor.h#L126 So comparing size_t with index_t causing build failed. Question: why our CI didn't report this previously, and even not from other PRs sent at same time? Does ccache hide this issue?
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