code: def C1():
      A = torch.zeros(10, 10)
      A.view(-1)[:-1:11] = -1
      A.view(-1)[10::11] = 1
  
      def diffeq(t, y):
          return torch.mv(A, y)
  
      def init():
          y0 = torch.zeros(10)
          y0[0] = 1
          return torch.tensor(0.0), y0
  
      return diffeq, init, None
  
imports: import math
  import torch
label_desc: Use image node_id 11 for calling a global function with example usage: C1() and returns: diffeq,  init,  None, torch, torch,  y0