code: def on_epoch_end(self, epoch, logs=None):
      print(
          "The average loss for epoch {} is {:7.2f} "
          "and mean absolute error is {:7.2f}.".format(
              epoch, logs["loss"], logs["mean_absolute_error"]
          )
      )
  
imports: import numpy
  import keras
label_desc: Use image node_id 3 for calling the LossAndErrorPrintingCallback obj's underlying member method code with example usage: obj.on_epoch_end(epoch, logs) without return types