I add the new feature in my network. It works. Thanks again.
    def forward(self, x,intensity):
        batchsize = x.size()[0]
        x, trans = self.feat(x)
        x = F.relu(self.bn1(self.conv1(x)))
        x = F.relu(self.bn2(self.conv2(x)))
        x = F.relu(self.bn3(self.conv3(x)))
        x = self.conv4(x)
        x = x.transpose(2,1).contiguous()
        x = F.log_softmax(x.view(-1,self.k), dim=-1)
        x = x.view(batchsize, self.num_points, self.k)
        x = x.transpose(2,1).contiguous()
        intensity = intensity.view(batchsize,1,self.num_points)
        x = torch.cat((x,intensity),1)
        x = self.bn4(self.conv5(x))
        x = x.transpose(2,1).contiguous()
        x = F.log_softmax(x.view(-1,self.k), dim=-1)
        x = x.view(batchsize, self.num_points, self.k)