Espnet2 ASR DataParallel API mismatching?
In `espnet/espnet2/train/trainer.py:250,17` 
It seems that `torch.nn.parallel.DataParallel` doesn't have a parameter `find_unused_parameters`.
Is it a bug?
diff --git a/espnet2/train/trainer.py b/espnet2/train/trainer.py
index 019c93e38..5d86bbb7d 100644
--- a/espnet2/train/trainer.py
+++ b/espnet2/train/trainer.py
@@ -247,7 +247,6 @@ class Trainer:
             dp_model = torch.nn.parallel.DataParallel(
                 model,
                 device_ids=list(range(distributed_option.ngpu)),
-                find_unused_parameters=trainer_options.unused_parameters,
             )
         else:
             # NOTE(kamo): DataParallel also should work with ngpu=1,
['espnet2/train/trainer.py']