code: def forward(self, input1, input2):
      x = torch.stack((input1, input2), dim=1)
      x = self.fc(x)
      x = self.out_act(x).flatten()
      return x
  
imports: import os
  from unittest import TestCase
  import numpy
  import pytest
  import torch
  import torch.nn
  from zoo.orca import OrcaContext
  from zoo.orca.data.pandas import read_csv
  from zoo.orca.learn.metrics import Accuracy
  from zoo import init_nncontext
  from zoo.orca.learn.pytorch import Estimator
  from zoo.orca.data import SparkXShards
  from zoo.orca.data.image.utils import chunks
label_desc: Use image node_id 2 for calling the SimpleModel obj's underlying member method code with example usage: obj.forward(input1, input2) and returns: x