code: def on_epoch_begin(self, epoch, logs=None):
      self.tuner.on_epoch_begin(
          self.trial, self.model, epoch, logs=logs
      )
  
imports: import collections
  import statistics
  import numpy
  from keras_tuner import backend
  from keras_tuner import errors
  from keras_tuner.backend import config
  from keras_tuner.backend import keras
  from keras_tuner.engine import hyperparameters
  from keras_tuner.engine import objective
label_desc: Use image node_id 2 for calling the TunerCallback obj's underlying member method code with example usage: obj.on_epoch_begin(epoch, logs) without return types