train val split method

src/model.py

@@ -51,3 +51,12 @@ def preprocess_data(ilidata):
 
     log_ili = fill_missing_values(log_ili)
 
+    return log_ili
+
+
+def train_val_split(ilidata):
+    train_ili, val_ili = ilidata.split_before(0.75)
+
+
+
+