How to use the pyopencga.rest_clients.ga4gh_client.GA4GH function in pyopencga

self.meta = None

        ## [TODO] convert to @properties
        self.users = Users(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.projects = Projects(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.studies = Studies(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.files = Files(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.samples = Samples(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.cohorts = Cohorts(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.families = Families(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.jobs = Jobs(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.individuals = Individuals(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.clinical = Clinical(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.alignment = Alignment(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.variant = Variant(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.ga4gh = GA4GH(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.meta = Meta(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.admin = Admin(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.panels = Panels(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.tool = Tool(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)

        self.clients = [self.users, self.projects, self.studies, self.files,
                        self.samples, self.cohorts, self.families, self.jobs,
                        self.individuals, self.clinical,
                        self.alignment, self.variant, self.ga4gh, self.meta,
                        self.admin, self.panels, self.tool]

        for client in self.clients:
            # only retry the ones with objects (instantiated clients)
            if client is not None:
                client.on_retry = self.on_retry