code: def V_(x, requires_grad=False, volatile=False):
      '''equivalent to create_variable, which creates a pytorch tensor'''
      return create_variable(x, volatile=volatile, requires_grad=requires_gradf V_(x, requires_grad=False, volatile=False):
      '''equivalent to create_variable, which creates a pytorch tensor'''
      return create_variable(x, volatile=volatile, requires_grad=requires_grad)
docs: equivalent to create_variable, which creates a pytorch tensor