mac compatibility (#219)

* mac compatibility

* refine import trick

parl/remote/compatible_trick.py

+#   Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+#
+# 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.
+"""
+This file is used to fix the problem that cloudpickle cannot load some packages normally in Mac OS.
+We hack the problem by trying load these packages in the main module in advance.
+
+Template:
+
+try:
+    import [PACKAGE1]
+except ImportError:
+    pass
+
+try:
+    import [PACKAGE2]
+except ImportError:
+    pass
+
+"""
+from parl.utils import _IS_MAC
+
+if _IS_MAC:
+    try:
+        import rlschool
+    except ImportError:
+        pass

parl/remote/job.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# Fix cloudpickle compatible problem we known.
+import compatible_trick
+
 import os
 os.environ['CUDA_VISIBLE_DEVICES'] = ''
 os.environ['XPARL'] = 'True'

parl/utils/utils.py

@@ -16,7 +16,7 @@ import sys
 
 __all__ = [
     'has_func', 'action_mapping', 'to_str', 'to_byte', 'is_PY2', 'is_PY3',
-    'MAX_INT32', '_HAS_FLUID', '_HAS_TORCH'
+    'MAX_INT32', '_HAS_FLUID', '_HAS_TORCH', '_IS_MAC'
 ]
 
 
@@ -92,3 +92,5 @@ try:
     _HAS_TORCH = True
 except ImportError:
     _HAS_TORCH = False
+
+_IS_MAC = (sys.platform == 'darwin')