asitstands commented on issue #10951: [MXNET-545] Fix broken cython build URL: https://github.com/apache/incubator-mxnet/pull/10951#issuecomment-398307755 A way to check whether or not cython is actually used at runtime is seeing `mx.nd._internal.NDArrayBase`. It must be `mxnet._cy3.ndarray.NDArrayBase` if cython is used and `mxnet._ctypes.ndarray.NDArrayBase` otherwise. So, if it is desirable, we could run a test like this before the unit tests run. ```bash if [ "$(echo -e 'import mxnet as mx\nprint(mx.nd._internal.NDArrayBase)' | python)" != "<class 'mxnet._cy3.ndarray.NDArrayBase'>" ]; then echo "Cython is not used." exit 1 fi ```
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