message: fix rips test code
diff: @@ -10,6 +10,11 @@ TensorFlow layer for Vietoris-Rips persistence
  Example of gradient computed from Vietoris-Rips persistence
  -----------------------------------------------------------
  +.. testsetup::
  + :hide:
  + import numpy
  + numpy.set_printoptions(precision=4)
  +
  .. testcode::
  from gudhi.tensorflow import RipsLayer
  