DOC: fix docstring of learning_curve
@@ -1000,6 +1000,7 @@ def learning_curve(estimator, X, y, groups=None,
If None, the random number generator is the RandomState instance used
by `np.random`. Used when ``shuffle`` == 'True'.
+ Returns
-------
train_sizes_abs : array, shape = (n_unique_ticks,), dtype int
Numbers of training examples that has been used to generate the
