How to use the azure-cognitiveservices-vision-face.azure.cognitiveservices.vision.face.models.GroupRequest function in azure-cognitiveservices-vision-face

:param face_ids: Array of candidate faceId created by Face - Detect.
         The maximum is 1000 faces
        :type face_ids: list[str]
        :param dict custom_headers: headers that will be added to the request
        :param bool raw: returns the direct response alongside the
         deserialized response
        :param operation_config: :ref:`Operation configuration
         overrides`.
        :return: GroupResult or ClientRawResponse if raw=true
        :rtype: ~azure.cognitiveservices.vision.face.models.GroupResult or
         ~msrest.pipeline.ClientRawResponse
        :raises:
         :class:`APIErrorException`
        """
        body = models.GroupRequest(face_ids=face_ids)

        # Construct URL
        url = self.group.metadata['url']
        path_format_arguments = {
            'Endpoint': self._serialize.url("self.config.endpoint", self.config.endpoint, 'str', skip_quote=True)
        }
        url = self._client.format_url(url, **path_format_arguments)

        # Construct parameters
        query_parameters = {}

        # Construct headers
        header_parameters = {}
        header_parameters['Accept'] = 'application/json'
        header_parameters['Content-Type'] = 'application/json; charset=utf-8'
        if custom_headers: