code: def forward(self, x):
      return x.view(x.size(0), -1)
  
file_path: fastai/nbs/examples/migrating_pytorch.py
imports: import torch
  from torch import nn
  import torch.nn.functional
  from torch.utils.data import DataLoader
  from torchvision import datasets, transforms
label_desc: Use image node_id 1 for calling the Flatten obj's underlying member method code with example usage: obj.forward(x) and returns: x