docstr: x shape: [batch, frame, feat, channel]
code: def call(self, x, training):
      """x shape: [batch, frame, feat, channel]"""
      x = self.conv(x)
      x = self.bn(x, training=training)
      x = tf.nn.relu6(x)
      x = self.drop(x, training=training)
      x = self.pool(x)
      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 CBDP obj's underlying member method code with example usage: obj.call(x, training) and returns: x