Core API

ray.init([address, num_cpus, num_gpus, ...])	Connect to an existing Ray cluster or start one and connect to it.
ray.shutdown([_exiting_interpreter])	Disconnect the worker, and terminate processes started by ray.init().
ray.is_initialized()	Check if ray.init has been called yet.

Tasks

ray.remote()	Defines a remote function or an actor class.
ray.remote_function.RemoteFunction.options(...)	Configures and overrides the task invocation parameters.
ray.cancel(object_ref, *[, force, recursive])	Cancels a task according to the following conditions.

Actors

ray.remote()	Defines a remote function or an actor class.
ray.actor.ActorClass.options(**actor_options)	Configures and overrides the actor instantiation parameters.
ray.method(*args, **kwargs)	Annotate an actor method.
ray.get_actor(name[, namespace])	Get a handle to a named actor.
ray.kill(actor, *[, no_restart])	Kill an actor forcefully.

Objects

ray.get()	Get a remote object or a list of remote objects from the object store.
ray.wait(object_refs, *[, num_returns, ...])	Return a list of IDs that are ready and a list of IDs that are not.
ray.put(value, *[, _owner])	Store an object in the object store.

Runtime Context

ray.runtime_context.get_runtime_context()	Get the runtime context of the current driver/worker.
ray.runtime_context.RuntimeContext(worker)	A class used for getting runtime context.
ray.get_gpu_ids()	Get the IDs of the GPUs that are available to the worker.

Cross Language

ray.cross_language.java_function(class_name, ...)	Define a Java function.
ray.cross_language.java_actor_class(class_name)	Define a Java actor class.