wrapper.py

class Wrapper(tf.keras.Model):
    def __init__(self, base_model):
        super(Wrapper, self).__init__()
        
        self.base_model = base_model
        self.average_pooling_layer = tf.keras.layers.GlobalAveragePooling2D()
        self.output_layer = tf.keras.layers.Dense(1)
        
    def call(self, inputs):
        x = self.base_model(inputs)
        x = self.average_pooling_layer(x)
        output = self.output_layer(x)
        return output