add fully connected layers at encoder of autoencoder
def fc(enco_1, enco_2):
flat_1 = Flatten()(enco_1)
flat_2 = Flatten()(enco_2)
flat = Concatenate()([enco_1, enco_2])
den = Dense(128, activation='relu')(flat)
out = Dense(num_classes, activation='softmax')(den)
return out
encode_1 = encoder_1(input_img_1)
encode_2 = encoder_2(input_img_2)
full_model = Model([input_img_1, input_img_2], fc(encode_1, encode_2))