code: def pipeline():
      output = fn.external_source(source=np.zeros((8, 8)), name="input")
      return output
  
imports: import nvidia.dali.fn
  from nvidia.dali import pipeline_def, Pipeline
  import numpy
  from nose_utils import raises
label_desc: Use image node_id 1 for calling a global function with example usage: pipeline() and returns: output