DOC fix MAE formula for tree splitting criterion
@@ -515,9 +515,9 @@ Mean Absolute Error:
.. math::
- \bar{y}_m = \frac{1}{N_m} \sum_{i \in N_m} y_i
+ median(y)_m = \underset{i \in N_m}{\mathrm{median}}(y_i)
- H(X_m) = \frac{1}{N_m} \sum_{i \in N_m} |y_i - \bar{y}_m|
+ H(X_m) = \frac{1}{N_m} \sum_{i \in N_m} |y_i - median(y)_m|
where :math:`X_m` is the training data in node :math:`m`
