code: def keras_fn():
      def fn():
          # print(f"horovod.spark.keras.util: using keras in tensorflow=={tf.__version__}")
          import tensorflow.keras as tf_keras
  
          return tf_keras
  
      return fn
  
imports: import io
  from packaging import version
  import h5py
  import numpy
  import tensorflow
  from horovod.runner.common.util import codec
  from horovod.spark.common import constants, params
  from horovod.spark.keras import optimizer, remote
label_desc: Use image node_id 6 for calling the TFKerasUtil obj's underlying member method code with example usage: obj.keras_fn() and returns: fn, tf_keras