기출 2회 작업형 2 오류 pred[:,1]

해당 오류가 뜨는 이유는 무엇일까요,,?

from sklearn.ensemble import RandomForestClassifier
rf = RandomForestClassifier(random_state=0)
rf.fit(X_tr,y_tr)
pred = rf.predict_proba(X_val)
from sklearn.metrics import roc_auc_score
print(pred)
print(roc_auc_score(y_val, pred[:,1]))

[array([[0.  , 0.  , 0.  , ..., 0.  , 0.  , 0.  ],
       [0.  , 0.  , 0.01, ..., 0.  , 0.  , 0.  ],
       [0.  , 0.  , 0.  , ..., 0.  , 0.  , 0.  ],
       ...,
       [0.  , 0.01, 0.  , ..., 0.  , 0.  , 0.  ],
       [0.  , 0.  , 0.  , ..., 0.01, 0.  , 0.  ],
       [0.  , 0.  , 0.  , ..., 0.  , 0.  , 0.  ]]), array([[0.  , 1.  ],
       [0.5 , 0.5 ],
       [0.71, 0.29],
       ...,
       [0.03, 0.97],
       [0.71, 0.29],
       [0.19, 0.81]])]
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-41-e325cda04cf0> in <cell line: 3>()
      1 from sklearn.metrics import roc_auc_score
      2 print(pred)
----> 3 print(roc_auc_score(y_val, pred[:,1]))

TypeError: list indices must be integers or slices, not tuple