Move orca learn ray tests to a ray sub dir (intel-analytics#2577)

* move orca learn ray tests to a ray sub dir

* fix path

python/orca/test/bigdl/orca/learn/mxnet/test_mxnet_spark_xshards.py → python/orca/test/bigdl/orca/learn/ray/mxnet/test_mxnet_spark_xshards.py

@@ -82,7 +82,7 @@ def forward(self, x):
 
 class TestMXNetSparkXShards(TestCase):
     def test_xshards_symbol_with_val(self):
-        resource_path = os.path.join(os.path.split(__file__)[0], "../../../resources")
+        resource_path = os.path.join(os.path.split(__file__)[0], "../../../../resources")
         train_file_path = os.path.join(resource_path, "orca/learn/single_input_json/train")
         train_data_shard = zoo.orca.data.pandas.read_json(
             train_file_path, orient='records', lines=False).transform_shard(prepare_data_symbol)
@@ -99,7 +99,7 @@ def test_xshards_symbol_with_val(self):
         estimator.shutdown()
 
     def test_xshards_symbol_without_val(self):
-        resource_path = os.path.join(os.path.split(__file__)[0], "../../../resources")
+        resource_path = os.path.join(os.path.split(__file__)[0], "../../../../resources")
         train_file_path = os.path.join(resource_path, "orca/learn/single_input_json/train")
         train_data_shard = zoo.orca.data.pandas.read_json(
             train_file_path, orient='records', lines=False).transform_shard(prepare_data_symbol)
@@ -110,7 +110,7 @@ def test_xshards_symbol_without_val(self):
         estimator.shutdown()
 
     def test_xshards_gluon(self):
-        resource_path = os.path.join(os.path.split(__file__)[0], "../../../resources")
+        resource_path = os.path.join(os.path.split(__file__)[0], "../../../../resources")
         train_file_path = os.path.join(resource_path, "orca/learn/single_input_json/train")
         train_data_shard = zoo.orca.data.pandas.read_json(
             train_file_path, orient='records', lines=False).transform_shard(prepare_data_gluon)

python/orca/test/bigdl/orca/learn/ray/pytorch/__init__.py

@@ -0,0 +1,15 @@
+#
+# Copyright 2018 Analytics Zoo Authors.
+#
+# 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.
+#