Add __all__ in `gradient_checker.py`

Add all in `gradient_checker.py`
a0590004 · Yu Yang · fcc28cce · a0590004
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python/paddle/v2/framework/tests/gradient_checker.py python/paddle/v2/framework/tests/gradient_checker.py +2 -0

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--- a/python/paddle/v2/framework/tests/gradient_checker.py
+++ b/python/paddle/v2/framework/tests/gradient_checker.py
@@ -3,6 +3,8 @@ from paddle.v2.framework.create_op_creation_methods import op_creations
 import numpy
 import unittest
+__all__ = ['get_numeric_gradient']
 def get_numeric_gradient(op,
                         input_values,