tensorflow_ranking/python/keras/model.py [444:451]:
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  def __init__(
      self,
      context_feature_spec: Dict[str, Union[tf.io.FixedLenFeature,
                                            tf.io.VarLenFeature,
                                            tf.io.RaggedFeature]],
      example_feature_spec: Dict[str, Union[tf.io.FixedLenFeature,
                                            tf.io.VarLenFeature,
                                            tf.io.RaggedFeature]],
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tensorflow_ranking/python/keras/pipeline.py [1145:1152]:
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  def __init__(
      self,
      context_feature_spec: Dict[str, Union[tf.io.FixedLenFeature,
                                            tf.io.VarLenFeature,
                                            tf.io.RaggedFeature]],
      example_feature_spec: Dict[str, Union[tf.io.FixedLenFeature,
                                            tf.io.VarLenFeature,
                                            tf.io.RaggedFeature]],
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