def _from_dict(cls, _dict):
        """Initialize a Features object from a json dictionary."""
        args = {}
        if 'concepts' in _dict:
            args['concepts'] = ConceptsOptions._from_dict(_dict.get('concepts'))
        if 'emotion' in _dict:
            args['emotion'] = EmotionOptions._from_dict(_dict.get('emotion'))
        if 'entities' in _dict:
            args['entities'] = EntitiesOptions._from_dict(_dict.get('entities'))
        if 'keywords' in _dict:
            args['keywords'] = KeywordsOptions._from_dict(_dict.get('keywords'))
        if 'metadata' in _dict:
            args['metadata'] = MetadataOptions._from_dict(_dict.get('metadata'))
        if 'relations' in _dict:
            args['relations'] = RelationsOptions._from_dict(
                _dict.get('relations'))
        if 'semantic_roles' in _dict:
            args['semantic_roles'] = SemanticRolesOptions._from_dict(
                _dict.get('semantic_roles'))
        if 'sentiment' in _dict:
            args['sentiment'] = SentimentOptions._from_dict(
                _dict.get('sentiment'))
        if 'categories' in _dict:
            args['categories'] = CategoriesOptions._from_dict(
                _dict.get('categories'))
        if 'syntax' in _dict:
            args['syntax'] = SyntaxOptions._from_dict(_dict.get('syntax'))
        return cls(**args)
Initialize a Features object from a json dictionary.