Ray Train Architecture
Contents
Ray Train Architecture#
A diagram of the Ray Train architecture is provided below.
Trainer#
The Trainer is the main class that is exposed in the Ray Train API that users will interact with.
The user will pass in a function which defines the training logic.
The Trainer will create an Executor to run the distributed training.
The Trainer will handle callbacks based on the results from the BackendExecutor.
Executor#
The executor is an interface which handles execution of distributed training.
The executor will handle the creation of an actor group and will be initialized in conjunction with a backend.
Worker resources, number of workers, and placement strategy will be passed to the Worker Group.
Backend#
A backend is used in conjunction with the executor to initialize and manage framework-specific communication protocols. Each communication library (Torch, Horovod, TensorFlow, etc.) will have a separate backend and will take a specific configuration value.
WorkerGroup#
The WorkerGroup is a generic utility class for managing a group of Ray Actors.
This is similar in concept to Fiber’s Ring.