Feature request: multiple concurrent computational graphs and multithreading

Hi,
There was some talk about it many months ago. Any chance it will be done in the next few months?
I appreciate Dynet a lot, but this is really a stumbling block for me.

Regards,
Slawek

The issue names no files, tests, or entry points; begin by reviewing the existing computational-graph and multithreading discussion referenced in the issue. The scope and expected behavior for concurrent graphs are not defined, so clarify those requirements before identifying implementation and test locations.

Written by the indexing model from the issue text.