def forward()

in losses.py [0:0]


    def forward(self, x, y):
        """Compute the beginning-intermediate feature of x, y and their MSE loss."""
        if not x.is_contiguous():
            x = x.contiguous()
        if not y.is_contiguous():
            y = y.contiguous()

        x_vgg, y_vgg = self.vgg(x), self.vgg(y)
        loss = 0
        for i in range(len(x_vgg)):
            loss += self.weights[i] * self.criterion(x_vgg[i], y_vgg[i].detach())
        return loss