How can I get attribute of a actor

Ray Core
1

How severe does this issue affect your experience of using Ray?

  • Medium: It contributes to significant difficulty to complete my task, but I can work around it.

For example, I have an x in class A, and class A is a ray actor. Here is the code.

@ray.remote
class A:
  def __init__(self):
    self.x=10
a=A.remote()

How can I get x without adding extra functions? a.x seems not good.
And I try ray.get(a).x and ray.get(a.x). Those also failed.

2

You cannot. You need to add a getter function to do that.

2 Likes
3

While not direct attribute access, you can try this as a general getter/setter function:

@ray.remote
class Actor:
    def __init__(self, *args, **kwargs):
        self.x = 10

    def _get_obj_name_recurse(self, name, obj):
        name = name.split(".", maxsplit=1)
        recurse = len(name) > 1
        next_name = name[1] if recurse else ""
        name = name[0]
        obj = self if obj is None else obj
        return obj, name, next_name, recurse

    def get_remote_attr(self, __name: str, __obj: object | None = None):
        obj, name, next_name, recurse = self._get_obj_name_recurse(__name, __obj)
        next_obj = getattr(obj, name)
        if recurse:
            next_obj = self.get_remote_attr(next_name, next_obj)
        return next_obj

    def set_remote_attr(self, __name: str, __value: Any, __obj: object | None = None):
        obj, name, next_name, recurse = self._get_obj_name_recurse(__name, __obj)
        if recurse:
            self.set_remote_attr(next_name, __value, obj)
        if hasattr(obj, name):
            setattr(obj, name, __value)

Then you can access attributes like so:

a = A.remote()
ray.get(a.get_remote_attr.remote("x"))