fix isort

Signed-off-by: jiemingz <jiemingz@nvidia.com>

nemo/collections/nlp/parts/nlp_overrides.py

@@ -66,6 +66,7 @@
 
 try:
  from apex.transformer.pipeline_parallel.utils import get_num_microbatches
+
  from nemo.core.optim.distributed_adam import MegatronDistributedFusedAdam
 
  HAVE_APEX = True
@@ -87,12 +88,12 @@
 try:
  from megatron.core import dist_checkpointing, parallel_state
  from megatron.core.dist_checkpointing.dict_utils import dict_list_map_outplace
- from megatron.core.dist_checkpointing.strategies import tensorstore
  from megatron.core.dist_checkpointing.optimizer import (
  get_param_id_to_sharded_param_map,
  make_sharded_optimizer_tensor,
  optim_state_to_sharding_state,
  )
+ from megatron.core.dist_checkpointing.strategies import tensorstore
  from megatron.core.transformer.module import Float16Module as MCoreFloat16Module
  from megatron.core.transformer.transformer_layer import TransformerLayer as MCoreTransformerLayer