add global batch normalization

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

@@ -21,7 +21,6 @@ class Hccl():
     _instance = None
     _rank_id = 0
     _rank_size = 1
-    _group_size = 4
 
     def __init__(self):
         pass
@@ -48,10 +47,6 @@ 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
@@ -70,14 +65,6 @@ def get_rank_size(group=None):
         return int(group.split("-")[0])
     raise ValueError
 
-def get_group_size(group=None):
-    hccl = Hccl()
-    if group is None:
-        return hccl.group_size
-    if isinstance(group, str):
-        return int(group.split("-")[0])
-    raise ValueError
-
 # pylint: disable=unused-argument
 def get_world_rank_from_group_rank(group, group_rank_id):
     return group_rank_id

tests/ut/python/nn/test_batchnorm.py

@@ -19,9 +19,6 @@ import pytest
 import mindspore.nn as nn
 from mindspore.common.api import _executor
 from mindspore import Tensor, Parameter
-from mindspore.communication.management import init
-from mindspore import context
-from mindspore import ParallelMode
 
 
 def test_bn_pars_valid1():