code: def triudl(X, l):
      Zl = torch.zeros_like(X, requires_grad=False)
      U = X * l
      Zl[1:] = X[1:] * (U.cumsum(dim=0)[:-1])
  
      return Zl
  
imports: import time
  import numpy
  import scipy.special
  import torch
  import torch.nn
  from .None import constants
  from .None import syssettings
  from .fginitialize import ChunkDataLoader
label_desc: Use image node_id 4 for calling a global function with example usage: triudl(X, l) and returns: Zl