DOC Clarify notation for logistic regression objective function
@@ -715,6 +715,9 @@ optimization problem
.. math:: \underset{w, c}{min\,} \|w\|_1 + C \sum_{i=1}^n \log(\exp(- y_i (X_i^T w + c)) + 1).
+Note that, in this notation, it's assumed that the observation :math:`y_i` takes values in the set
+:math:`{-1, 1}` at trial :math:`i`.
+
The solvers implemented in the class :class:`LogisticRegression`
are "liblinear", "newton-cg", "lbfgs", "sag" and "saga":
