Usage of "adequacy_model" in the def _active_to_passive() and def _passive_to_active()

[SuperBruceJia]

In the codes, an adequacy model is applied to score and rank the generated sentences.
(1) def _formal_to_casual(): https://github.com/PrithivirajDamodaran/Styleformer/blob/main/styleformer/styleformer.py#L69-L95
(2) def _casual_to_formal(): https://github.com/PrithivirajDamodaran/Styleformer/blob/main/styleformer/styleformer.py#L97-L123

May I know why it is not used in the def _active_to_passive() and def _passive_to_active()?

Thank you very much!