code: def test_gluon_nonzero_hybridize():
      class Foo(HybridBlock):
          def __init__(self):
              super().__init__()
  
          def forward(self, x):
              dat = npx.nonzero(x)
              return dat.sum() + dat
  
      foo = Foo()
      foo.hybridize()
      out = foo(mx.np.array([1, 0, 2, 0, 3, 0]))
      out.wait_to_read()
      out = foo(mx.np.array([0, 0, 0, 0, 0, 0]))
      out.wait_to_read()
  
file_path: gluon-nlp/tests/test_gluon_block.py
imports: import pytest
  import mxnet
  from mxnet import nd, np, npx
  from mxnet.test_utils import assert_allclose
  from mxnet.gluon import HybridBlock, Constant
  from mxnet.gluon.data import DataLoader
  import itertools
label_desc: Use image node_id 3 for calling a global function with example usage: test_gluon_nonzero_hybridize() and returns: unknown