message: Add scikit-learn as a third party library as it is required by persistence representations
diff: @@ -257,6 +257,13 @@ The :doc:`Wasserstein distance </wasserstein_distance_user>`
  module requires `POT <https://pot.readthedocs.io/>`_, a library that provides
  several solvers for optimization problems related to Optimal Transport.
  +Scikit-learn
  +============
  +
  +The :doc:`persistence representations </representations>` module require
  +`scikit-learn <https://scikit-learn.org/>`_, a Python-based ecosystem of
  +open-source software for machine learning.
  +
  SciPy
  =====
  