colmantse

### Description use_vocab_from_other_problem seems to return a function instead of a problem instance I could directly change vocab_filename, but since this is the recommended approach, guess i better ask. ......

Multistep optimizer "Failed to place the graph without changing the devices" non fatal

2

### Description Received warning as below: ```Failed to place the graph without changing the devices of some resources. Some of the operations (that had to be colocated with resource generating...