KeyError：转换模型时为0

Question

IAM尝试训练模型，但出现KeyError：0

def startModel(ht):
    t1=ht['title']
    l1=ht['location']
    table_headers=['accepted']
    le = preprocessing.LabelEncoder()
    title_encoded=le.fit_transform(t1)
    location_encoded=le.fit_transform(l1)
    label=le.fit_transform(table_headers)
    features=list(zip(title_encoded,location_encoded))
    model = KNeighborsClassifier(n_neighbors=3)
    model.fit(features,label)
    predicted= model.predict([[title_encoded,location_encoded]])