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immich/machine-learning/gunicorn_conf.py

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import os
from gunicorn.arbiter import Arbiter
from gunicorn.workers.base import Worker
device_ids = os.environ.get("MACHINE_LEARNING_DEVICE_IDS", "0").replace(" ", "").split(",")
env = os.environ
# Round-robin device assignment for each worker
def pre_fork(arbiter: Arbiter, _: Worker) -> None:
env["MACHINE_LEARNING_DEVICE_ID"] = device_ids[len(arbiter.WORKERS) % len(device_ids)]