code: def _to_numpy(x):
      assert False
  
imports: import functools
  import numpy
  import nvidia.dali.fn
  import nvidia.dali.ops
  from nvidia.dali import Pipeline
  from nose_utils import assert_raises
  from test_utils import check_output
label_desc: Use image node_id 1 for calling a global function with example usage: _to_numpy(x) without return types