code: def __init__(self, extract_output_append=None):
      self._extract_output_append = extract_output_append
  
imports: import functools
  from absl.testing import absltest
  import apache_beam
  from apache_beam.testing import util
  from tensorflow_model_analysis.api import types
  from tensorflow_model_analysis.evaluators import confidence_intervals_util
  from tensorflow_model_analysis.evaluators import jackknife
  from tensorflow_model_analysis.metrics import binary_confusion_matrices
  from tensorflow_model_analysis.metrics import metric_types
label_desc: Use image node_id 1 to create a new ListCombineFn object from inherited base classes: beam with example: obj = ListCombineFn(extract_output_append)