jax.distributed.initialize¶

jax.distributed.initialize(coordinator_address, num_processes, process_id)[source]¶

Initialize distributed system for topology discovery.

Currently, calling initialize sets up the multi-host GPU backend, and is not required for CPU or TPU backends.

Parameters

coordinator_address (str) – IP address and port of the coordinator. The choice of port does not matter, so long as the port is available on the coordinator and all processes agree on the port.
num_processes (int) – Number of processes.
process_id (int) – Id of the current process.

Example:

Suppose there are two GPU hosts, and host 0 is the designated coordinator with address 10.0.0.1:1234. To initialize the GPU cluster, run the following commands before anything else.

On host 0:

>>> jax.distributed.initialize('10.0.0.1:1234', 2, 0)  

On host 1:

>>> jax.distributed.initialize('10.0.0.1:1234', 2, 1)  