def average_loss(self) -> float: return average_or_nan([r.loss for r in self.results])
def average_word_error_rate(self) -> float: return average_or_nan([r.word_error_rate for r in self.results])
def average_word_error_count(self): return average_or_nan([r.word_error_count for r in self.results])
def average_letter_error_rate(self) -> float: return average_or_nan([r.letter_error_rate for r in self.results])
def average_letter_error_count(self): return average_or_nan([r.letter_error_count for r in self.results])