Merge branch 'feature/20180524-fix_enum_size_error' into 'feature/201…

…80401-file-format-converter'

Fix .nnb enum size problem

See merge request nnabla/nnabla!185

python/src/nnabla/utils/converter/nnablart/nnb.py

@@ -191,14 +191,14 @@ def export(self, nnb_output_filename, settings_template_filename, settings_filen
         for n, f in enumerate(self._info._network.function):
 
             function_data = struct.pack(
-                'I', list(self._info._function_info.keys()).index(f.type))
+                'H', list(self._info._function_info.keys()).index(f.type))
 
             # Default function implementation is 0(float)
             if f.name not in settings['functions']:
                 settings['functions'][f.name] = collections.OrderedDict()
                 settings['functions'][f.name]['implement'] = 0
 
-            function_data += struct.pack('I',
+            function_data += struct.pack('H',
                                          settings['functions'][f.name]['implement'])
 
             finfo = self._info._function_info[f.type]