[style] consistent nn. and nn.functional: part 4 examples (#12156)

* consistent nn. and nn.functional: p4 examples

* restore

examples/research_projects/wav2vec2/run_asr.py

@@ -9,8 +9,8 @@ from typing import Any, Callable, Dict, List, Optional, Set, Union
 import datasets
 import numpy as np
 import torch
-import torch.nn as nn
 from packaging import version
+from torch import nn
 
 import librosa
 from lang_trans import arabic

examples/research_projects/wav2vec2/run_pretrain.py

@@ -5,9 +5,9 @@ from dataclasses import dataclass, field
 from typing import Any, Dict, List, Optional, Union
 
 import torch
-import torch.nn as nn
 from datasets import DatasetDict, load_dataset
 from packaging import version
+from torch import nn
 
 import librosa
 from transformers import (