docs: def _from_dict(cls, _dict):
          """Initialize a VoiceModel object from a json dictionary."""
          args = {}
          if 'customization_id' in _dict:
              args['customization_id'] = _dict.get('customization_id')
          else:
              raise ValueError(
                  'Required property \'customization_id\' not present in VoiceModel JSON'
              )
          if 'name' in _dict:
              args['name'] = _dict.get('name')
          if 'language' in _dict:
              args['language'] = _dict.get('language')
          if 'owner' in _dict:
              args['owner'] = _dict.get('owner')
          if 'created' in _dict:
              args['created'] = _dict.get('created')
          if 'last_modified' in _dict:
              args['last_modified'] = _dict.get('last_modified')
          if 'description' in _dict:
              args['description'] = _dict.get('description')
          if 'words' in _dict:
              args['words'] = [Word._from_dict(x) for x in (_dict.get('words'))]
          return cls(**args)