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Ray: Fix RayExecutor to fail when num_workers=0 and num_hosts=None #3210

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merged 1 commit into from Oct 11, 2021
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Ray: Fix RayExecutor to fail when num_workers=0 and num_hosts=None #3210

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6 changes: 3 additions & 3 deletions horovod/ray/runner.py
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Expand Up @@ -218,12 +218,12 @@ def __init__(
cpus_per_worker = cpus_per_slot
gpus_per_worker = gpus_per_slot

if num_workers is None and num_hosts is None:
raise ValueError("Either `num_workers` or `num_hosts` must be "
if not (num_workers or num_hosts):
raise ValueError("One of `num_workers` or `num_hosts` must be "
"set.")

if num_workers and num_hosts:
raise ValueError("Both `num_workers` and `num_hosts` cannot be "
raise ValueError("Only one of `num_workers` and `num_hosts` must be "
"set.")

if gpus_per_worker and not use_gpu:
Expand Down