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

used to judge whether one face belong to one person. The range of
         confidenceThreshold is [0, 1] (default specified by algorithm).
        :type confidence_threshold: float
        :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: list or ClientRawResponse if raw=true
        :rtype:
         list[~azure.cognitiveservices.vision.face.models.IdentifyResult] or
         ~msrest.pipeline.ClientRawResponse
        :raises:
         :class:`APIErrorException`
        """
        body = models.IdentifyRequest(face_ids=face_ids, person_group_id=person_group_id, large_person_group_id=large_person_group_id, max_num_of_candidates_returned=max_num_of_candidates_returned, confidence_threshold=confidence_threshold)

        # Construct URL
        url = self.identify.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: