code: def __call__(self, sample_info):
      a = super().__call__(sample_info)
      return a, np.array([sample_info.idx_in_batch])
  
imports: import numpy
  import nvidia.dali
  from nose.tools import with_setup
  from test_pool_utils import capture_processes, teardown_function, setup_function
  from test_utils import compare_pipelines, check_batch, RandomDataIterator, RandomlyShapedDataIterator
label_desc: Use image node_id 1 for calling the ExtCallbackMultipleOutputs obj's underlying member method code with example usage: obj.__call__(sample_info) and returns: a,  np