Remove unused g_main_program in tests

python/paddle/v2/framework/tests/test_fit_a_line.py

@@ -3,7 +3,7 @@ import paddle.v2.framework.layers as layers
 import paddle.v2.framework.core as core
 import paddle.v2.framework.optimizer as optimizer
 
-from paddle.v2.framework.framework import Program, g_main_program
+from paddle.v2.framework.framework import Program
 from paddle.v2.framework.io import save_persistables, load_persistables
 from paddle.v2.framework.executor import Executor
 

python/paddle/v2/framework/tests/test_inference_model_io.py

@@ -3,7 +3,7 @@ import paddle.v2.framework.layers as layers
 import paddle.v2.framework.core as core
 import paddle.v2.framework.optimizer as optimizer
 
-from paddle.v2.framework.framework import Program, g_main_program
+from paddle.v2.framework.framework import Program
 from paddle.v2.framework.io import save_inference_model, load_inference_model
 import paddle.v2.framework.executor as executor
 import unittest

python/paddle/v2/framework/tests/test_layers.py

 import paddle.v2.framework.layers as layers
 import paddle.v2.framework.nets as nets
-from paddle.v2.framework.framework import Program, g_main_program
+from paddle.v2.framework.framework import Program
 import paddle.v2.framework.core as core
 import unittest
 

python/paddle/v2/framework/tests/test_recognize_digits_conv.py

@@ -4,7 +4,7 @@ import paddle.v2.framework.nets as nets
 import paddle.v2.framework.core as core
 import paddle.v2.framework.optimizer as optimizer
 
-from paddle.v2.framework.framework import Program, g_main_program
+from paddle.v2.framework.framework import Program
 from paddle.v2.framework.executor import Executor
 
 import numpy as np

python/paddle/v2/framework/tests/test_recommender_system.py

@@ -4,7 +4,7 @@ import paddle.v2.framework.nets as nets
 import paddle.v2.framework.core as core
 import paddle.v2.framework.optimizer as optimizer
 
-from paddle.v2.framework.framework import Program, g_main_program
+from paddle.v2.framework.framework import Program
 from paddle.v2.framework.executor import Executor
 
 import numpy as np

python/paddle/v2/framework/tests/test_word2vec.py

@@ -3,7 +3,7 @@ import paddle.v2.framework.layers as layers
 import paddle.v2.framework.core as core
 import paddle.v2.framework.optimizer as optimizer
 
-from paddle.v2.framework.framework import Program, g_main_program
+from paddle.v2.framework.framework import Program
 from paddle.v2.framework.executor import Executor
 
 import numpy as np