[fix](data_portal): do not add files of input data which start with '_' (#601)
[fix](data_portal): do not add files of input data which start with '_' (#601)


bytedance/fedlearner,bytedance/fedlearner,bytedance/fedlearner,bytedance/fedlearner,bytedance/fedlearner,bytedance/fedlearner,bytedance/fedlearner