Initialize a SpeechRecognitionResult object from a json dictionary.

def _from_dict(cls, _dict):
        """Initialize a SpeechRecognitionResult object from a json dictionary."""
        args = {}
        if 'final' in _dict or 'final_results' in _dict:
            args['final_results'] = _dict.get('final') or _dict.get(
                'final_results')
        else:
            raise ValueError(
                'Required property \'final\' not present in SpeechRecognitionResult JSON'
            )
        if 'alternatives' in _dict:
            args['alternatives'] = [
                SpeechRecognitionAlternative._from_dict(x)
                for x in (_dict.get('alternatives'))
            ]
        else:
            raise ValueError(
                'Required property \'alternatives\' not present in SpeechRecognitionResult JSON'
            )
        if 'keywords_result' in _dict:
            args['keywords_result'] = _dict.get('keywords_result')
        if 'word_alternatives' in _dict:
            args['word_alternatives'] = [
                WordAlternativeResults._from_dict(x)
                for x in (_dict.get('word_alternatives'))
            ]
        return cls(**args)