traveller59 opened a new issue #7981: Python: When pass None to mx.sym.var's 
shape and infer, python stop working
URL: https://github.com/apache/incubator-mxnet/issues/7981
 
 
   ## Environment info
   Operating System: Windows 10 64bit
   Package used (Python/R/Scala/Julia):Python 
   MXNet version: 0.11
   ## Error Message:
   mxnet should raise a exception instead of stop working when user pass a 
None(tensorflow style) shape to mx.sym.var
   Code:
   ```python
   x = mx.sym.var('x', shape=(None, 100))
   y = mx.sym.var('y', shape=(None, 100))
   z = x + y
   t = x** 2 + z / y
   t.infer_shape()
   ```
   Error:
   ```
   [19:40:57] D:\Program Files 
(x86)\Jenkins\workspace\mxnet\mxnet\src\executor\infer_graph_attr_pass.cc:139: 
Check failed: is >> rshape[out_ent_id] Invalid attribute
   ```
 
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