[GitHub] [incubator-mxnet] sxjscience opened a new issue #18074: [Numpy] Unique has not registered the gradient

[GitBox]

sxjscience opened a new issue #18074: [Numpy] Unique has not registered the 
gradient
URL: https://github.com/apache/incubator-mxnet/issues/18074
 
 
   ```python
   import mxnet as mx
   from mxnet.gluon import nn, HybridBlock
   mx.npx.set_np()
   
   class Foo(HybridBlock):
       def hybrid_forward(self, F, x):
           y = F.np.unique(x)
           return y
   
   foo = Foo()
   foo.hybridize()
   out = foo(mx.np.ones((10,)))
   print(out.asnumpy())
   ```
   
   Error message:
   
   ```
   MXNetError: Traceback (most recent call last):
     File "../src/nnvm/gradient.cc", line 213
   MXNetError: Operator _npi_unique is non-differentiable because it didn't 
register FGradient attribute.
   ```

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