code: def test_ellipsis_not_implemented():
      data = [np.uint8([1, 2, 3]), np.uint8([1, 2])]
      src = fn.external_source(lambda: data)
      with assert_raises(NotImplementedError):
          _ = src[..., :1]
  
imports: from nvidia import dali
  from nvidia.dali import fn
  import numpy
  from nvidia.dali.pipeline import Pipeline
  from nose_utils import assert_raises
label_desc: Use image node_id 18 for calling a global function with example usage: test_ellipsis_not_implemented() without return types