code: def E3():
      def diffeq(t, y):
          dy0 = y[1]
          dy1 = y[0] ** 3 / 6 - y[0] + 2 * torch.sin(2.78535 * t)
          return torch.stack([dy0, dy1])
  
      def init():
          return torch.tensor(0.0), torch.tensor([0.0, 0.0])
  
      return diffeq, init, None
  
imports: import math
  import torch
label_desc: Use image node_id 19 for calling a global function with example usage: E3() and returns: diffeq,  init,  None, torch, torch,  torch