TypeError：类型为builtin_function_or_method的对象不可JSON序列化

Question

这是我第一次在Web服务器上工作，我正在使用flask编写宁静的get请求，以将参数传递给我构建的预测模型。

app = Flask(__name__)
api = Api(app)

class AST(Resource):
    def get(self):
        args = request.args
        x1 = args['key1']
        x2 = args['key2']
        X = [[x1, x2]]
        x = load_scaler.transform(X)
        y_predict = load_model.predict(x)
        y_predict = load_model.predict(np.array(x)).tolist
        time = [{'predection':y_predict}]
        return Response (json.dumps(time),  mimetype='application/json')


api.add_resource(AST, '/start_time')

if __name__ == '__main__':
    app.run

运行代码时，它给了我错误：

TypeError：builtin_function_or_method类型的对象不可JSON序列化

回溯显示

File "/Users/123/Documents/123/webserver/predictionast.py", line 60, in get
    return Response (json.dumps(time),  mimetype='application/json')
  File "/Users/123/opt/anaconda3/lib/python3.7/json/__init__.py", line 231, in dumps
    return _default_encoder.encode(obj)
  File "/Users/123/opt/anaconda3/lib/python3.7/json/encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/Users/123/opt/anaconda3/lib/python3.7/json/encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
  File "/Users/123/opt/anaconda3/lib/python3.7/json/encoder.py", line 179, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type builtin_function_or_method is not JSON serializable

y_predict是数组