eric-haibin-lin opened a new issue #17267: Unclear error message in np.dstack URL: https://github.com/apache/incubator-mxnet/issues/17267 ## Description `mxnet.np.dstack` throws dtype mismatch if one input is `int32` and the other is `float32`. However, the error message is not that clear: ``` mxnet.base.MXNetError: [18:18:56] /generic-flavor/src/src/operator/nn/concat.cc:152: Check failed: i == dtype || i == -1: Non-uniform data type in Concat Stack trace: /lib/libmxnet.so(dmlc::LogMessageFatal::~LogMessageFatal()+0x24) [0x7f776418f5a4] /lib/libmxnet.so(+0x3523b10) [0x7f77664b4b10] /lib/libmxnet.so(mxnet::imperative::SetShapeType(mxnet::Context const&, nnvm::NodeAttrs const&, std::vector<mxnet::NDArray*, std::allocator<mxnet::NDArray*> > const&, std::vector<mxnet::NDArray*, std::allocator<mxnet::NDArray*> > const&, mxnet::DispatchMode*)+0x46d) [0x7f776600f8ed] /lib/libmxnet.so(mxnet::Imperative::Invoke(mxnet::Context const&, nnvm::NodeAttrs const&, std::vector<mxnet::NDArray*, std::allocator<mxnet::NDArray*> > const&, std::vector<mxnet::NDArray*, std::allocator<mxnet::NDArray*> > const&)+0x297) [0x7f7766005137] /lib/libmxnet.so(MXImperativeInvokeImpl(void*, int, void**, int*, void***, int, char const**, char const**)+0x5e5) [0x7f7765f11a05] /lib/libmxnet.so(MXImperativeInvokeEx+0x67) [0x7f7765f12d97] /python3.6/lib/python3.6/lib-dynload/_ctypes.cpython-36m-x86_64-linux-gnu.so(ffi_call_unix64+0x4c) [0x7f778ecbcef8] /python3.6/lib/python3.6/lib-dynload/_ctypes.cpython-36m-x86_64-linux-gnu.so(ffi_call+0x15f) [0x7f778ecbbfff] /python3.6/lib/python3.6/lib-dynload/_ctypes.cpython-36m-x86_64-linux-gnu.so(_ctypes_callproc+0x292) [0x7f778ecb3e02] ``` When this op is use in a nested gluon block, it's a bit hard to investigate what are the actual types of input 0 and input 1. It will be much more helpful if the actual data types can be printed.
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