add options to control the number of checkpoints being evaluated afte…

…r training (open-mmlab#770)

tools/train.py

@@ -41,6 +41,7 @@ def parse_config():
 
     parser.add_argument('--max_waiting_mins', type=int, default=0, help='max waiting minutes')
     parser.add_argument('--start_epoch', type=int, default=0, help='')
+    parser.add_argument('--num_epochs_to_eval', type=int, default=0, help='number of checkpoints to be evaluated')
     parser.add_argument('--save_to_file', action='store_true', default=False, help='')
 
     args = parser.parse_args()
@@ -186,7 +187,7 @@ def main():
     )
     eval_output_dir = output_dir / 'eval' / 'eval_with_train'
     eval_output_dir.mkdir(parents=True, exist_ok=True)
-    args.start_epoch = max(args.epochs - 0, 0)  # Only evaluate the last 10 epochs
+    args.start_epoch = max(args.epochs - args.num_epochs_to_eval, 0)  # Only evaluate the last args.num_epochs_to_eval epochs
 
     repeat_eval_ckpt(
         model.module if dist_train else model,