code: def on_epoch_end(self, epoch, logs=None):
      current_lr = tf.keras.backend.get_value(self.model.optimizer.lr)
      print("epoch {} current lr is {}".format(epoch, current_lr))
  
imports: from zoo.orca import init_orca_context, stop_orca_context
  import os
  import argparse
  import tensorflow
label_desc: Use image node_id 2 for calling the LRLogger obj's underlying member method code with example usage: obj.on_epoch_end(epoch, logs) without return types