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[python-package] Suppress confusing warning in dask module #6987

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[python-package] Suppress confusing warning in dask module #6987

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e0fbdcc
Fix: Suppress confusing warning in dask module
wohoef Jul 30, 2025
04a7115
Improve user-set parameter overwrite warning
wohoef Jul 30, 2025
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5 changes: 4 additions & 1 deletion python-package/lightgbm/dask.py
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Original file line number Diff line number Diff line change
Expand Up @@ -548,7 +548,10 @@ def _train(
# * 'num_threads': overridden to match nthreads on each Dask process
for param_alias in _ConfigAliases.get("num_machines", "num_threads"):
if param_alias in params:
_log_warning(f"Parameter {param_alias} will be ignored.")
# Only warn if user-set parameter will be overwritten
val = params[param_alias]
if val not in (-1, None):
_log_warning(f"Parameter {param_alias}={val} will be ignored. This is automatically adjusted to match the Dask cluster. To suppress this warning, pass {param_alias}=-1 or remove {param_alias} entirely.")
params.pop(param_alias)

# Split arrays/dataframes into parts. Arrange parts into dicts to enforce co-locality
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