Bugs in Resume Checkpoint

[chienyiwang]

Thanks for the great work on this template.
However, in the base_trainer.py, there are two bugs while resuming checkpoints:

1. line 100: (I think this is related to i face error when resume training. #54, but you closed the issue without fixing it)
   While resume training from saved checkpoints, there will be "reference before assignment" error on the not_improved_count variable.
2. line 165 and 171:
   The sanity check here is invalid, as the config would be overwritten by the config.json of the saved checkpoint when parsing config (line 22 in parse_config.py)

[SunQpark]

Thank you for reporting these problems, @chienyiwang.
I'll start working on this soon.

[SunQpark]

I made PR #58 for this Issue. Could you review the changes @chienyiwang??

[chienyiwang]

Just reviewed. Thanks for the quick fix!