diff --git a/apt/minimization/minimizer.py b/apt/minimization/minimizer.py
index e0760fe..a4a7322 100644
--- a/apt/minimization/minimizer.py
+++ b/apt/minimization/minimizer.py
@@ -10,9 +10,6 @@ import copy
 import sys
 from scipy.spatial import distance
 from sklearn.base import BaseEstimator, TransformerMixin, MetaEstimatorMixin
-from sklearn.compose import ColumnTransformer
-from sklearn.impute import SimpleImputer
-from sklearn.pipeline import Pipeline
 from sklearn.preprocessing import OneHotEncoder, OrdinalEncoder
 from sklearn.utils.validation import check_is_fitted
 from sklearn.tree import DecisionTreeClassifier, DecisionTreeRegressor