zhanghang1989 commented on issue #9989: Cannot train example gluon style 
transfer
URL: 
https://github.com/apache/incubator-mxnet/issues/9989#issuecomment-371252011
 
 
   @piiswrong Need some help about API changes. 
   In the style transfer example, the `set_data()` function was okay for 
back-propagation, but the code recent broke. Is there any recent update break 
this, any solutions?
   - Error message:
   ```
   mxnet.base.MXNetError: [19:08:27] src/imperative/imperative.cc:192: Check 
failed: AGInfo::IsNone(*(outputs [i])) Assigning to NDArrays that are already 
in a computational graph will cause undefined behavior when evaluating 
gradients. Please call backward first to clear the graph or do this out side of 
a record section. 
   ```
   - Link to the code:
   
https://github.com/apache/incubator-mxnet/blob/master/example/gluon/style_transfer/net.py#L252

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