如果用上面注释中的keras代码，test的时候就加载不了dense_1/bias，用了下面的代码就正常了。真的rubbish

class Project_layer(object):
  def __init__(self,num_classes):
    # self.multiclass_dense_layer = K.layers.Dense(num_classes,activation='relu')  
    # super()
    self.linear_model = tf.layers.Dense(units=num_classes,activation='relu')

  def __call__(self,x):
    # return self.multiclass_dense_layer(x)
    # return subgraph(x)
    return self.linear_model(x)
    # return tf.layers.dense(x,self.num_classes,activation='relu')