Remove unused variable

split.py

@@ -2,8 +2,7 @@ import numpy as np
 from sklearn.model_selection import train_test_split
 
 def train_test_indexes_patient_wise(dataset, test_size=0.2, stratify=True):
-     
-    files = dataset.get_files()
+    
     patients = dataset.get_patients()
     unique_patients = np.unique(patients)