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