code: def forward(self, x):
      x = self.relu(self.conv1(x))
      x = self.relu(self.conv2(x))
      x = self.relu(self.conv3(x))
      x = self.pixel_shuffle(self.conv4(x))
      return x
  
imports: import torch.nn
  import torch.nn.init
label_desc: Use image node_id 2 for calling the SuperResolutionNet obj's underlying member method code with example usage: obj.forward(x) and returns: x