Improve wandb logging

Author: sinahmr

train.py

@@ -386,6 +386,10 @@
                    help='use the multi-epochs-loader to save time at the beginning of every epoch')
 group.add_argument('--log-wandb', action='store_true', default=False,
                    help='log training and validation metrics to wandb')
+group.add_argument('--wandb-tags', default=[], type=str, nargs='+',
+                   help='wandb tags')
+group.add_argument('--wandb-resume-id', default='', type=str, metavar='ID',
+                   help='If resuming a run, the id of the run in wandb')
 
 
 def _parse_args():
@@ -814,7 +818,10 @@ def main():
 
     if utils.is_primary(args) and args.log_wandb:
         if has_wandb:
-            wandb.init(project=args.experiment, config=args)
+            assert not args.wandb_resume_id or args.resume
+            wandb.init(project=args.experiment, config=args, tags=args.wandb_tags,
+                       resume='must' if args.wandb_resume_id else None,
+                       id=args.wandb_resume_id if args.wandb_resume_id else None)
         else:
             _logger.warning(
                 "You've requested to log metrics to wandb but package not found. "