add global batch normalization

tests/ut/python/hccl_test/manage/api.py

@@ -21,6 +21,7 @@ class Hccl():
     _instance = None
     _rank_id = 0
     _rank_size = 1
+    _group_size = 4
 
     def __init__(self):
         pass
@@ -47,6 +48,10 @@ class Hccl():
     def rank_size(self):
         return self._rank_size
 
+    @property
+    def group_size(self):
+        return self._group_size
+
     @rank_size.setter
     def rank_size(self, size):
         self._rank_size = size
@@ -68,7 +73,7 @@ def get_rank_size(group=None):
 def get_group_size(group=None):
     hccl = Hccl()
     if group is None:
-        return hccl.rank_size
+        return hccl.group_size
     if isinstance(group, str):
         return int(group.split("-")[0])
     raise ValueError