[GitHub] [incubator-mxnet] fhieber opened a new issue #15052: broadcast_to is broken in latest MXNet

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

fhieber opened a new issue #15052: broadcast_to is broken in latest MXNet
URL: https://github.com/apache/incubator-mxnet/issues/15052
 
 
   Latest nightly builds of mxnet broke the `broadcast_to` op.
   The documentation of this operator states:
   ```
   For example::
   
      broadcast_to([[1,2,3]], shape=(2,3)) = [[ 1.,  2.,  3.],
                                              [ 1.,  2.,  3.]])
   
   The dimension which you do not want to change can also be kept as `0` which means copy the original value.
   So with `shape=(2,0)`, we will obtain the same result as in the above example.
   ```
   
   Using `shape=(2,0)` works in mxnet==1.4.1 but not in the nightly builds:
   ```
   > mx.nd.broadcast_to(mx.nd.array([[1,2,3]]), shape=(2,0))
   MXNetError: [14:07:42] src/operator/tensor/./broadcast_reduce_op.h:393: Check failed: ishape[i] == oshape[i] || ishape[i] == 1: Array cannot be broadcasted from [1,3] to [2,0]
   Stack trace:
     [bt] (0) 1   libmxnet.so                         0x0000000111a3a629 mxnet::op::NDArrayOpProp::~NDArrayOpProp() + 4473
     [bt] (1) 2   libmxnet.so                         0x00000001120becb8 void mxnet::op::ReduceAxesOpForwardEx<mshadow::cpu, mshadow::red::sum, true>(nnvm::NodeAttrs const&, mxnet::OpContext const&, std::__1::vector<mxnet::NDArray, std::__1::allocator<mxnet::NDArray> > const&, std::__1::vector<mxnet::OpReqType, std::__1::allocator<mxnet::OpReqType> > const&, std::__1::vector<mxnet::NDArray, std::__1::allocator<mxnet::NDArray> > const&) + 20792
     [bt] (2) 3   libmxnet.so                         0x0000000112ede193 mxnet::imperative::SetShapeType(mxnet::Context const&, nnvm::NodeAttrs const&, std::__1::vector<mxnet::NDArray*, std::__1::allocator<mxnet::NDArray*> > const&, std::__1::vector<mxnet::NDArray*, std::__1::allocator<mxnet::NDArray*> > const&, mxnet::DispatchMode*) + 1603
     [bt] (3) 4   libmxnet.so                         0x0000000112edcaac mxnet::Imperative::Invoke(mxnet::Context const&, nnvm::NodeAttrs const&, std::__1::vector<mxnet::NDArray*, std::__1::allocator<mxnet::NDArray*> > const&, std::__1::vector<mxnet::NDArray*, std::__1::allocator<mxnet::NDArray*> > const&) + 716
     [bt] (4) 5   libmxnet.so                         0x0000000112e22aae SetNDInputsOutputs(nnvm::Op const*, std::__1::vector<mxnet::NDArray*, std::__1::allocator<mxnet::NDArray*> >*, std::__1::vector<mxnet::NDArray*, std::__1::allocator<mxnet::NDArray*> >*, int, void* const*, int*, int, int, void***) + 1582
     [bt] (5) 6   libmxnet.so                         0x0000000112e237f0 MXImperativeInvokeEx + 176
     [bt] (6) 7   libffi.6.dylib                      0x000000010a367884 ffi_call_unix64 + 76
   ```

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