code: def forward(self, x):
      return x * 2
  
imports: import torch
  import torch.nn
  import torch.nn.functional
  import torchvision
  from torch.autograd import Variable
  from tensorboardX import SummaryWriter
  import pytest
label_desc: Use image node_id 2 for calling the SimpleModel obj's underlying member method code with example usage: obj.forward(x) and returns: unknown