bindings/python/examples: use relative paths wrt. __file__, not current directory

bindings/python/examples/Distributed/CifarResNet_Distributed.py

@@ -129,6 +129,7 @@ def cifar_resnet(data_path, run_test, num_epochs, communicator=None, save_model_
 
 if __name__ == '__main__':
     data_path = os.path.abspath(os.path.normpath(os.path.join(
+        os.path.dirname(os.path.abspath(__file__)),
         *"../../../../Examples/Image/DataSets/CIFAR-10/".split("/"))))
 
     os.chdir(data_path)
@@ -161,4 +162,4 @@ if __name__ == '__main__':
     
     print("Error: %f" % error)
 
-    distributed.communicator.finalize()
+    distributed.communicator.finalize()

bindings/python/examples/test/cifar_resnet_test.py

@@ -25,9 +25,11 @@ def test_cifar_resnet_error(device_id):
     try:
         base_path = os.path.join(os.environ['CNTK_EXTERNAL_TESTDATA_SOURCE_DIRECTORY'],
                                 *"Image/CIFAR/v0/cifar-10-batches-py".split("/"))
+        # N.B. CNTK_EXTERNAL_TESTDATA_SOURCE_DIRECTORY has {train,test}_map.txt
+        #      and CIFAR-10_mean.xml in the base_path.
     except KeyError:
-        base_path = os.path.join(
-            *"../../../../Examples/Image/DataSets/CIFAR-10/cifar-10-batches-py".split("/"))
+        base_path = os.path.join(os.path.dirname(os.path.abspath(__file__)),
+                                *"../../../../Examples/Image/DataSets/CIFAR-10".split("/"))
 
     base_path = os.path.normpath(base_path)
     os.chdir(os.path.join(base_path, '..'))