alireza202 edited a comment on issue #11635: Aborted python session when using nd.concat URL: https://github.com/apache/incubator-mxnet/issues/11635#issuecomment-404255759 The python crashing aside, how would I actually concatenate an empty tensor with another tensor? I tried both dimensions, and it fails: ``` >>> import mxnet as mx >>> a = mx.nd.empty((0, 1)) >>> b = mx.nd.ones((1, 1)) >>> mx.nd.concat(a, b, dim=0) ``` ``` Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<string>", line 63, in concat File "/home/ec2-user/anaconda3/envs/mxnet_p36/lib/python3.6/site-packages/mxnet/_ctypes/ndarray.py", line 92, in _imperative_invoke ctypes.byref(out_stypes))) File "/home/ec2-user/anaconda3/envs/mxnet_p36/lib/python3.6/site-packages/mxnet/base.py", line 146, in check_call raise MXNetError(py_str(_LIB.MXGetLastError())) mxnet.base.MXNetError: [17:52:18] src/imperative/./imperative_utils.h:107: Check failed: infershape[attrs.op](attrs, &in_shapes, &out_shapes) Stack trace returned 10 entries: [bt] (0) /home/ec2-user/anaconda3/envs/mxnet_p36/lib/python3.6/site-packages/mxnet/libmxnet.so(+0x276938) [0x7fd8d40d0938] [bt] (1) /home/ec2-user/anaconda3/envs/mxnet_p36/lib/python3.6/site-packages/mxnet/libmxnet.so(+0x276d48) [0x7fd8d40d0d48] [bt] (2) /home/ec2-user/anaconda3/envs/mxnet_p36/lib/python3.6/site-packages/mxnet/libmxnet.so(+0x2473416) [0x7fd8d62cd416] [bt] (3) /home/ec2-user/anaconda3/envs/mxnet_p36/lib/python3.6/site-packages/mxnet/libmxnet.so(+0x24757e9) [0x7fd8d62cf7e9] [bt] (4) /home/ec2-user/anaconda3/envs/mxnet_p36/lib/python3.6/site-packages/mxnet/libmxnet.so(+0x23b6ceb) [0x7fd8d6210ceb] [bt] (5) /home/ec2-user/anaconda3/envs/mxnet_p36/lib/python3.6/site-packages/mxnet/libmxnet.so(MXImperativeInvokeEx+0x63) [0x7fd8d6211283] [bt] (6) /home/ec2-user/anaconda3/envs/mxnet_p36/lib/python3.6/lib-dynload/../../libffi.so.6(ffi_call_unix64+0x4c) [0x7fd90e019ec0] [bt] (7) /home/ec2-user/anaconda3/envs/mxnet_p36/lib/python3.6/lib-dynload/../../libffi.so.6(ffi_call+0x22d) [0x7fd90e01987d] [bt] (8) /home/ec2-user/anaconda3/envs/mxnet_p36/lib/python3.6/lib-dynload/_ctypes.cpython-36m-x86_64-linux-gnu.so(_ctypes_callproc+0x2ce) [0x7fd90e22edee] [bt] (9) /home/ec2-user/anaconda3/envs/mxnet_p36/lib/python3.6/lib-dynload/_ctypes.cpython-36m-x86_64-linux-gnu.so(+0x12825) [0x7fd90e22f825] ```
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