[GitHub] [incubator-mxnet] sxjscience opened a new issue #16887: [Numpy] Bug of basic indexing

[GitBox <gi...@apache.org>]

sxjscience opened a new issue #16887: [Numpy] Bug of basic indexing
URL: https://github.com/apache/incubator-mxnet/issues/16887
 
 
   Found this bug when writing random test cases for symbolic indexing.
   
   ```python
   import mxnet as mx
   from mxnet import gluon
   mx.npx.set_np()
   
   a = mx.np.random.normal(0, 1, (5, 5, 5, 5))
   b = mx.np.random.normal(0, 1, (5, 5, 5, 5))
   index1 = (slice(3, 0, -1), slice(1, 0, -1), slice(2, 0, -1), slice(3, 0, -1))
   index2 = (slice(2, 3, 2), slice(0, 1, 2), slice(1, 2, 2), slice(1, 3, 2))
   
   class Foo(gluon.HybridBlock):
       def hybrid_forward(self, F, x, y):
           return (x[()][index1] + y[()][index1])[index2]
   
   net = Foo()
   with mx.autograd.record():
       out = net(a, b)
   ```
   
   Error:
   ```
   MXNetError: [07:04:22] src/ndarray/ndarray.cc:263: Check failed: shape_.Size() == shape.Size() (2 vs. 1) : NDArray.Reshape: target shape must have the same size as current shape when recording with autograd.
   Stack trace:
     [bt] (0) /home/ubuntu/mxnet/python/mxnet/../../lib/libmxnet.so(dmlc::LogMessageFatal::~LogMessageFatal()+0x32) [0x7f1da2489c42]
     [bt] (1) /home/ubuntu/mxnet/python/mxnet/../../lib/libmxnet.so(mxnet::NDArray::ReshapeWithRecord(mxnet::TShape const&)+0x187) [0x7f1da59d4877]
     [bt] (2) /home/ubuntu/mxnet/python/mxnet/../../lib/libmxnet.so(MXNDArrayReshape64+0xa7) [0x7f1da612f2e7]
     [bt] (3) /usr/lib/python3.5/lib-dynload/_ctypes.cpython-35m-x86_64-linux-gnu.so(ffi_call_unix64+0x4c) [0x7f1e6fc14e20]
     [bt] (4) /usr/lib/python3.5/lib-dynload/_ctypes.cpython-35m-x86_64-linux-gnu.so(ffi_call+0x2eb) [0x7f1e6fc1488b]
     [bt] (5) /usr/lib/python3.5/lib-dynload/_ctypes.cpython-35m-x86_64-linux-gnu.so(_ctypes_callproc+0x49a) [0x7f1e6fc0f01a]
     [bt] (6) /usr/lib/python3.5/lib-dynload/_ctypes.cpython-35m-x86_64-linux-gnu.so(+0x9fcb) [0x7f1e6fc02fcb]
     [bt] (7) /usr/bin/python3(PyObject_Call+0x47) [0x5c3bd7]
     [bt] (8) /usr/bin/python3(PyEval_EvalFrameEx+0x4f2f) [0x5354af]
   ```

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