model - ValueError：y 包含以前看不见的标签：'Barred Tee'

Question

这些行我总是得到相同的错误，即使这些行之前没有错误。

# prepare target
def prepare_targets(y_train, y_test):
    le = LabelEncoder()
    le.fit(y_train)
    y_train_enc = le.transform(y_train)
    y_test_enc = le.transform(y_test)
    return y_train_enc, y_test_enc

y_train, y_test = prepare_targets(y_train, y_test)

print()
print('___ PREPARE TARGET ___')
print('y_train ', y_train.shape)
print('y_test ', y_test.shape)

y_train = np_utils.to_categorical(y_train)
y_test = np_utils.to_categorical(y_test)
num_classes = y_test.shape[1]
print('y_trains ', y_train.shape)
print('y_tests ', y_test.shape)

谁能建议我如何克服这个问题？