From 3010e9abf20c62526a52e6d26143f12bd1e4140c Mon Sep 17 00:00:00 2001
From: Simon Nilsson <sronilsson@gmail.com>
Date: Tue, 10 Oct 2023 13:35:42 -0400
Subject: [PATCH] Update train_model_mixin.py

---
 simba/mixins/train_model_mixin.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/simba/mixins/train_model_mixin.py b/simba/mixins/train_model_mixin.py
index 682988260..13f14a437 100644
--- a/simba/mixins/train_model_mixin.py
+++ b/simba/mixins/train_model_mixin.py
@@ -770,6 +770,9 @@ def create_shap_log(
         .. note::
            For improved run-times, use multiprocessing through :meth:`simba.mixins.train_model_mixins.TrainModelMixin.create_shap_log_mp`
 
+        .. math::
+           $$\phi_i(f, x) = \sum_{S \subseteq F \setminus {i}} \frac{|S|!(|F| - |S| - 1)!}{|F|!} (f_{S \cup {i}}(x_{S \cup {i}}) - f_S(x_S))$$
+
         :param str ini_file_path: Path to the SimBA project_config.ini
         :param RandomForestClassifier rf_clf: sklearn random forest classifier
         :param pd.DataFrame x_df: Test features.