WarpCTC build failure in 1.5.0

[samskalicky]

Building the warpCTC plugin fails i 1.5.0 due to this PR #14270

It fails with the following error:

In file included from plugin/warpctc/warpctc.cc:27:0:
plugin/warpctc/./warpctc-inl.h: In member function ‘virtual bool mxnet::op::WarpCTCProp::InferShape(mxnet::ShapeVector*, mxnet::ShapeVector*, mxnet::ShapeVector*) const’:
plugin/warpctc/./warpctc-inl.h:257:48: error: no matching function for call to ‘mxnet::TShape::TShape(int)’
     mxnet::TShape label_shape(dshape.ndim() - 1);
                                                ^
plugin/warpctc/./warpctc-inl.h:257:48: note: candidates are:
In file included from include/mxnet/./base.h:38:0,
                 from include/mxnet/operator.h:38,
                 from plugin/warpctc/./warpctc-inl.h:31,
                 from plugin/warpctc/warpctc.cc:27:
include/mxnet/./tuple.h:519:10: note: template<int dim> mxnet::TShape::TShape(mshadow::Shape<ndim>&&)
   inline TShape(mshadow::Shape<dim> &&s) {// NOLINT(*)
          ^
include/mxnet/./tuple.h:519:10: note:   template argument deduction/substitution failed:
In file included from plugin/warpctc/warpctc.cc:27:0:
plugin/warpctc/./warpctc-inl.h:257:48: note:   mismatched types ‘mshadow::Shape<ndim>’ and ‘int’
     mxnet::TShape label_shape(dshape.ndim() - 1);
                                                ^

looks like nnvm::Tshape takes a single int for constructor:
https://github.com/dmlc/tvm/blob/master/nnvm/include/nnvm/tuple.h#L352

But mxnet::Tshape does not have this constructor, instead we provide the default value as well (which is value: 1 in nnvm)
https://github.com/apache/incubator-mxnet/blob/master/include/mxnet/tuple.h#L406

[mxnet-label-bot]

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Thank you for submitting the issue! I will try and suggest some labels so that the appropriate MXNet community members can help resolve it.
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[vrakesh]

@samskalicky Thanks for reporting this Sam, and thanks for the quick PR as well

@mxnet-label-bot add [Build, Bug]