Created by: gongweibao

When we need to fetch variable's value from trainer program, we can use code like these:

329             outs = exe.run(feed=feed_list,
330                            fetch_list=[sum_cost.name, token_num.name])

1. But how we can fetch variable from pserver program? And
2. How can a user know where a variable is on a pserver by its EndPoint?