Update Mimic4Dataset.py

Mimic4Dataset.py

@@ -536,7 +536,7 @@ class Mimic4Dataset(datasets.GeneratorBasedBuilder):
        
         data=data.T
         train_data, test_data = train_test_split(data, test_size=self.test_size, random_state=42)
-        train_data, val_data = train_test_split(test_data, test_size=self.val_size, random_state=42)
+        train_data, val_data = train_test_split(train_data, test_size=self.val_size, random_state=42)
         
         dict_dir = "./data/dict/"+self.config.name.replace(" ","_")
         train_dic = train_data.to_dict('index')