fix ray dag serialization for local mode

mars/deploy/oscar/local.py

@@ -27,6 +27,7 @@
 from ...lib.aio import get_isolation, stop_isolation
 from ...oscar.backends.router import Router
 from ...resource import cpu_count, cuda_count, mem_total
+from ...serialization.ray import register_ray_serializers, unregister_ray_serializers
 from ...services import NodeRole
 from ...services.task.execution.api import ExecutionConfig
 from ...typing import ClusterType, ClientType
@@ -162,6 +163,8 @@ def __init__(
         self._config = load_config(config, default_config_file=DEFAULT_CONFIG_FILE)
         execution_config = ExecutionConfig.from_config(self._config, backend=backend)
         self._backend = execution_config.backend
+        if self._backend == "ray":
+            register_ray_serializers()
         self._web = web
         self._n_supervisor_process = n_supervisor_process
 
@@ -290,6 +293,8 @@ async def stop(self):
         AbstractSession.reset_default()
         self._exiting_check_task.cancel()
         Router.set_instance(None)
+        if self._backend == "ray":
+            unregister_ray_serializers()
 
 
 class LocalClient: