Enable correctness testing for NASNet

Author: taehoonlee

tests/applications_test.py

@@ -176,9 +176,8 @@ def test_densenet():
                     reason='NASNets are supported only on TensorFlow')
 def test_nasnet():
     app, last_dim = random.choice(NASNET_LIST)
-    # TODO: enable correctness testing by passing the `module` arg.
-    # Currently it seems that weight loading fails.
-    _test_application_basic(app, module=None)
+    module = nasnet
+    _test_application_basic(app, module=module)
     _test_application_notop(app, last_dim)
     _test_application_variable_input_channels(app, last_dim)
     _test_app_pooling(app, last_dim)