def get_comments_batch(self, project, work_item_id, ids, include_deleted=None, expand=None):
        """GetCommentsBatch.
        [Preview API] Returns a list of work item comments by ids.
        :param str project: Project ID or project name
        :param int work_item_id: Id of a work item to get comments for.
        :param [int] ids: Comma-separated list of comment ids to return.
        :param bool include_deleted: Specify if the deleted comments should be retrieved.
        :param str expand: Specifies the additional data retrieval options for work item comments.
        :rtype: :class:`<CommentList> <azure.devops.v5_1.work-item-tracking.models.CommentList>`
        """
        route_values = {}
        if project is not None:
            route_values['project'] = self._serialize.url('project', project, 'str')
        if work_item_id is not None:
            route_values['workItemId'] = self._serialize.url('work_item_id', work_item_id, 'int')
        query_parameters = {}
        if ids is not None:
            ids = ",".join(map(str, ids))
            query_parameters['ids'] = self._serialize.query('ids', ids, 'str')
        if include_deleted is not None:
            query_parameters['includeDeleted'] = self._serialize.query('include_deleted', include_deleted, 'bool')
        if expand is not None:
            query_parameters['$expand'] = self._serialize.query('expand', expand, 'str')
        response = self._send(http_method='GET',
                              location_id='608aac0a-32e1-4493-a863-b9cf4566d257',
                              version='5.1-preview.3',
                              route_values=route_values,
                              query_parameters=query_parameters)
        return self._deserialize('CommentList', response)
GetCommentsBatch.
        [Preview API] Returns a list of work item comments by ids.
        :param str project: Project ID or project name
        :param int work_item_id: Id of a work item to get comments for.
        :param [int] ids: Comma-separated list of comment ids to return.
        :param bool include_deleted: Specify if the deleted comments should be retrieved.
        :param str expand: Specifies the additional data retrieval options for work item comments.
        :rtype: :class:`<CommentList> <azure.devops.v5_1.work-item-tracking.models.CommentList>`