'module'对象没有属性'FunctionSet'

Running this code

运行这段代码

 model = chainer.FunctionSet(conv1=F.Convolution2D(3,100,3, pad=1), 
         bn1   = F.BatchNormalization(100),
         conv2=F.Convolution2D(100,100,3, pad=1),
 model = chainer.F