code: def call(self, x, training):
      x = self.block1(x, training)
      x = self.block2(x, training)
      x = self.block3(x, training)
      return x
  
imports: import numpy
  from absl import logging
  import delta.compat
  from tensorflow.python.keras import backend
  from delta.models.base_model import Model
  from delta.layers.base_layer import Layer
  from delta import utils
  from delta.utils.register import registers
label_desc: Use image node_id 2 for calling the CNN obj's underlying member method code with example usage: obj.call(x, training) and returns: x