reset auto parallel context before each test

tests/ut/python/parallel/conftest.py

+# Copyright 2020 Huawei Technologies Co., Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import pytest
+import mindspore.context as context
+from mindspore.parallel._auto_parallel_context import auto_parallel_context
+from mindspore.parallel._cost_model_context import reset_cost_model_context
+from mindspore.parallel.algo_parameter_config import reset_algo_parameters
+from mindspore.parallel._utils import _reset_op_id
+
+@pytest.fixture(scope="function", autouse="True")
+def reset_test_context():
+    context.reset_auto_parallel_context()
+    auto_parallel_context().set_enable_all_reduce_fusion(enable_all_reduce_fusion=True)
+    context.set_context(mode=context.GRAPH_MODE, device_target="Ascend", save_graphs=False)
+    reset_cost_model_context()
+    reset_algo_parameters()
+    _reset_op_id()