refactor(nyz): add new compatibility file in ding top level

ding/__init__.py

 import os
-import torch
 
 __TITLE__ = 'DI-engine'
 __VERSION__ = 'v0.2.0'
@@ -11,7 +10,3 @@ __version__ = __VERSION__
 enable_hpc_rl = False
 enable_linklink = os.environ.get('ENABLE_LINKLINK', 'false').lower() == 'true'
 enable_numba = True
-
-
-def torch_gt_131():
-    return int("".join(list(filter(str.isdigit, torch.__version__)))) >= 131

ding/compatibility.py

+import torch
+
+
+def torch_gt_131():
+    return int("".join(list(filter(str.isdigit, torch.__version__)))) >= 131

ding/torch_utils/network/nn_module.py

@@ -4,7 +4,7 @@ import torch.nn as nn
 import torch.nn.functional as F
 from torch.nn.init import xavier_normal_, kaiming_normal_, orthogonal_
 from typing import Union, Tuple, List, Callable
-from ding import torch_gt_131
+from ding.compatibility import torch_gt_131
 
 from .normalization import build_normalization
 

ding/utils/data/collate_fn.py

@@ -5,7 +5,7 @@ import torch
 import re
 from torch._six import string_classes
 import collections.abc as container_abcs
-from ding import torch_gt_131
+from ding.compatibility import torch_gt_131
 
 int_classes = int
 np_str_obj_array_pattern = re.compile(r'[SaUO]')