ugokju - 経済統計練習帳

import math
 
import chainer
import chainer.functions as F
import chainer.links as L
 
 
class NIN(chainer.Chain):
 
    """Network-in-Network example model."""
 
    insize = 227
 
    def __init__(self):
        w = math.sqrt(2)  # MSRA scaling
        super(NIN, self).__init__(
            mlpconv1=L.MLPConvolution2D(
                3, (96, 96, 96), 11, stride=4, wscale=w),
            mlpconv2=L.MLPConvolution2D(
                96, (256, 256, 256), 5, pad=2, wscale=w),
            mlpconv3=L.MLPConvolution2D(
                256, (384, 384, 384), 3, pad=1, wscale=w),
            mlpconv4=L.MLPConvolution2D(
                384, (1024, 1024, 1000), 3, pad=1, wscale=w),
        )
        self.train = True
 
    def clear(self):
        self.loss = None
        self.accuracy = None
 
    def __call__(self, x, t):
        self.clear()
        h = F.max_pooling_2d(F.relu(self.mlpconv1(x)), 3, stride=2)
        h = F.max_pooling_2d(F.relu(self.mlpconv2(h)), 3, stride=2)
        h = F.max_pooling_2d(F.relu(self.mlpconv3(h)), 3, stride=2)
        h = self.mlpconv4(F.dropout(h, train=self.train))
        h = F.reshape(F.average_pooling_2d(h, 6), (x.data.shape[0], 1000))
 
        self.loss = F.softmax_cross_entropy(h, t)
        self.accuracy = F.accuracy(h, t)
        return self.loss
 
    def predict(self, x_data):
        x = chainer.Variable(x_data, volatile=True)
        h = F.max_pooling_2d(F.relu(self.mlpconv1(x)), 3, stride=2)
        h = F.max_pooling_2d(F.relu(self.mlpconv2(h)), 3, stride=2)
        h = F.max_pooling_2d(F.relu(self.mlpconv3(h)), 3, stride=2)
        h = self.mlpconv4(F.dropout(h, train=self.train))
        h = F.reshape(F.average_pooling_2d(h, 6), (x.data.shape[0], 1000))
 
        return F.softmax(h)