MPIEnvironment¶

class lightning.pytorch.plugins.environments.MPIEnvironment[source]¶

An environment for running on clusters with processes created through MPI.

Requires the installation of the mpi4py package. See also: https://github.com/mpi4py/mpi4py

static detect()[source]¶

Returns True if the mpi4py package is installed and MPI returns a world size greater than 1.

global_rank()[source]¶

The rank (index) of the currently running process across all nodes and devices.

local_rank()[source]¶

The rank (index) of the currently running process inside of the current node.

node_rank()[source]¶

The rank (index) of the node on which the current process runs.

world_size()[source]¶

The number of processes across all devices and nodes.

property creates_processes_externally: bool¶: Whether the environment creates the subprocesses or not.

property main_address: str¶: The main address through which all processes connect and communicate.

property main_port: int¶: An open and configured port in the main node through which all processes communicate.