code: def forward(self, x):
      return torch.relu(self.l1(x.view(x.size(0), -1)))
  
file_path: fastai/nbs/examples/migrating_lightning.py
imports: from fastai.data.load import DataLoader
  import os, torch
  from torch.nn import functional
  from torchvision.datasets import MNIST
  from torchvision import transforms
  from lightning import LightningModule
label_desc: Use image node_id 2 for calling the LitModel obj's underlying member method code with example usage: obj.forward(x) and returns: torch