code: def V(x, requires_grad=False, volatile=False):
      '''creates a single or a list of pytorch tensors, depending on input x. '''
      return map_over(x, lambda o: V_(o, requires_grad, volatile)f V(x, requires_grad=False, volatile=False):
      '''creates a single or a list of pytorch tensors, depending on input x. '''
      return map_over(x, lambda o: V_(o, requires_grad, volatile))
docs: creates a single or a list of pytorch tensors, depending on input x.