message: Change docs for x.
  X actually is a list of arguments for the function, not simply the list of Tensors.
  Otherwise could bring something like
  tf__test_func() takes 1 positional argument but 2 were given
diff: @@ -301,7 +301,7 @@ def compute_gradient(f, x, delta=1e-3):
  Args:
  f: the function.
  - x: a list of tensors.
  + x: a list arguments for the function
  delta: (optional) perturbation used to compute numeric Jacobian.
  Returns:
  