code: def forward(self, x):
      return x.view(x.size(0), -1)
  
file_path: SerpentAI/serpent/machine_learning/reinforcement_learning/ppo/cnn_base.py
imports: import torch
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