Crossmedia的图像索引找不到是否有默认值代替

按照crossmedia准备好了图像数据放置在hdfs上，准备好了样本数据也放在hdfs上，但是拿ids去索引图像的feature时报错如下：
Check Status [PS2XDL::ConvertStatus(data_source_->BatchGet(inputx, &data_closures))] at [/home/yue.song/x-deeplearning/xdl/xdl/core/ops/ps_ops/model_server/hdfs_data_source.cc]Compute@78
Check Status [PS2XDL::ConvertStatus(st)] at [/home/yue.song/x-deeplearning/xdl/xdl/core/ops/ps_ops/model_server/model_server_client_forward.cc]operator()@44]
想问大神们，图像索引不到这个问题有没有遇到过，这个应该是很正常的现象，xdl里面有没有给找不到索引数据的id赋默认值的接口，或者有其他解决方案？

Start with the failing BatchGet path in xdl/core/ops/ps_ops/model_server/hdfs_data_source.cc and the caller in xdl/core/ops/ps_ops/model_server/model_server_client_forward.cc. Reproduce the missing-image-feature lookup using the HDFS data described in the issue, then determine the supported behavior for IDs without indexed data; done means the failure has a defined fallback or a documented alternative and the reproduction is covered by a test.

Written by the indexing model from the issue text.