[Refactor] Remove outdated code (#1370)

mmcv/runner/dist_utils.py

@@ -10,8 +10,6 @@ from torch import distributed as dist
 from torch._utils import (_flatten_dense_tensors, _take_tensors,
                           _unflatten_dense_tensors)
 
-from mmcv.utils import TORCH_VERSION, digit_version
-
 
 def init_dist(launcher, backend='nccl', **kwargs):
     if mp.get_start_method(allow_none=True) is None:
@@ -78,15 +76,7 @@ def _init_dist_slurm(backend, port=None):
 
 
 def get_dist_info():
-    if (TORCH_VERSION != 'parrots'
-            and digit_version(TORCH_VERSION) < digit_version('1.0')):
-        initialized = dist._initialized
-    else:
-        if dist.is_available():
-            initialized = dist.is_initialized()
-        else:
-            initialized = False
-    if initialized:
+    if dist.is_available() and dist.is_initialized():
         rank = dist.get_rank()
         world_size = dist.get_world_size()
     else: