Missed update dist-bn logic for EMA model

Author: rwightman

train.py

@@ -393,16 +393,16 @@ def main():
                 lr_scheduler=lr_scheduler, saver=saver, output_dir=output_dir,
                 use_amp=use_amp, model_ema=model_ema)
 
-            if args.distributed and args.dist_bn and args.dist_bn in ('broadcast', 'reduce'):
+            if args.distributed and args.dist_bn in ('broadcast', 'reduce'):
                 if args.local_rank == 0:
                     logging.info("Distributing BatchNorm running means and vars")
                 distribute_bn(model, args.world_size, args.dist_bn == 'reduce')
 
             eval_metrics = validate(model, loader_eval, validate_loss_fn, args)
 
             if model_ema is not None and not args.model_ema_force_cpu:
-                if args.distributed and args.reduce_bn:
-                    distribute_bn(model_ema, args.world_size)
+                if args.distributed and args.dist_bn in ('broadcast', 'reduce'):
+                    distribute_bn(model_ema, args.world_size, args.dist_bn == 'reduce')
 
                 ema_eval_metrics = validate(
                     model_ema.ema, loader_eval, validate_loss_fn, args, log_suffix=' (EMA)')