code: def _new_optimizer() -> tf.keras.optimizers.Optimizer:
      return tf.keras.optimizers.Adam()
  
imports: import os
  import pickle
  from typing import Callable, Dict, Union
  import numpy
  import tensorflow
  from headliner.model.attention_model import Encoder, Decoder
  from headliner.model.summarizer import Summarizer
  from headliner.preprocessing.preprocessor import Preprocessor
  from headliner.preprocessing.vectorizer import Vectorizer
label_desc: Use image node_id 9 for calling the AttentionSummarizer obj's underlying member method code with example usage: obj._new_optimizer() and returns: tf