optimum/neuron/models/inference/backend/utils/distributed.py

# coding=utf-8
# Copyright 2025 The HuggingFace Inc. team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Adapted from https://github.com/aws-neuron/neuronx-distributed-inference/blob/9993358ce052fd7a1bb4a7497a6318aac36ed95c/src/neuronx_distributed_inference/utils/distributed.py
import os


def get_init_world_size() -> int:
    """Get world size set by distributed launcher (torchrun or mpirun)"""
    for var in ["WORLD_SIZE", "OMPI_COMM_WORLD_SIZE"]:
        if var in os.environ and os.environ[var] != "":
            return int(os.environ[var])
    return -1


def get_init_rank() -> int:
    """Get rank set by distributed launcher (torchrun or mpirun)"""
    for var in ["RANK", "OMPI_COMM_WORLD_RANK"]:
        if var in os.environ and os.environ[var] != "":
            return int(os.environ[var])
    return -1