code: def forward(self, t, y):
      return torch.mm(y**3, true_A)
  
imports: import os
  import argparse
  import time
  import numpy
  import torch
  import torch.nn
  import torch.optim
label_desc: Use image node_id 1 for calling the Lambda obj's underlying member method code with example usage: obj.forward(t, y) and returns: torch