docs: def _from_dict(cls, _dict):
          """Initialize a NluEnrichmentFeatures object from a json dictionary."""
          args = {}
          if 'keywords' in _dict:
              args['keywords'] = NluEnrichmentKeywords._from_dict(
                  _dict.get('keywords'))
          if 'entities' in _dict:
              args['entities'] = NluEnrichmentEntities._from_dict(
                  _dict.get('entities'))
          if 'sentiment' in _dict:
              args['sentiment'] = NluEnrichmentSentiment._from_dict(
                  _dict.get('sentiment'))
          if 'emotion' in _dict:
              args['emotion'] = NluEnrichmentEmotion._from_dict(
                  _dict.get('emotion'))
          if 'categories' in _dict:
              args['categories'] = NluEnrichmentCategories._from_dict(
                  _dict.get('categories'))
          if 'semantic_roles' in _dict:
              args['semantic_roles'] = NluEnrichmentSemanticRoles._from_dict(
                  _dict.get('semantic_roles'))
          if 'relations' in _dict:
              args['relations'] = NluEnrichmentRelations._from_dict(
                  _dict.get('relations'))
          if 'concepts' in _dict:
              args['concepts'] = NluEnrichmentConcepts._from_dict(
                  _dict.get('concepts'))
          return cls(**args)