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[python] Improve error message for plot_metric with Booster #4709

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Oct 26, 2021
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[python] Improve error message for plot_metric with Booster #4709

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3c99f87
Improve error message for plot_metric with Booster
js850 Oct 23, 2021
faae310
Update error message
js850 Oct 25, 2021
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2 changes: 2 additions & 0 deletions python-package/lightgbm/plotting.py
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Original file line number Diff line number Diff line change
Expand Up @@ -342,6 +342,8 @@ def plot_metric(
eval_results = deepcopy(booster.evals_result_)
elif isinstance(booster, dict):
eval_results = deepcopy(booster)
elif isinstance(booster, Booster):
raise TypeError("booster must be dict or LGBMModel. To use plot_metric with Booster type, first record the metrics using record_evaluation callback then pass that to plot_metric as argument `booster`")
else:
raise TypeError('booster must be dict or LGBMModel.')

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