def experimental(api_name):
 if (not chainer.disable_experimental_feature_warning):
  warnings.warn('{} is experimental. The interface can change in the future.'.format(api_name), FutureWarning)

def experimental ( api_name ) : if ( not chainer . disable_experimental_feature_warning ) : warnings . warn ( '{} is experimental. The interface can change in the future.' . format ( api_name ) , FutureWarning )
declares that user is using an experimental feature .