索引器错误：索引0超出大小为0的轴0的界限。我想不出来

Question

我有以下代码：

preds = np.reshape(preds, (preds.shape[0]))
for index in range(0, len(preds)):
    pred = (preds[index]+1)* (X_test[index][0]) #error on this line
    preds_original.append(pred)
preds_original = np.array(preds_original)
if train_phase:
    return [date, y_test, preds_original]
else:
    import datetime
    return [date+datetime.timedelta(days=1),y_test]

但我得到了一个错误：

IndexError: index 0 is out of bounds for axis 0 with size 0

我怎样才能解决这个问题？你知道吗