added some docs for data_manager.py#25

Merged

devin-petersohn merged 2 commits intodevin-petersohn:rewrite_backendfrom

weiwzhang:rewrite_backend

Sep 23, 2018

Commits on Sep 23, 2018

added docs for data_manager.py starting line1250

weiwzhang
authored and
devin-petersohn
committed
added and revised some func docs

weiwzhang
authored and
devin-petersohn
committed