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This is by design. feature order will affect the accuracy.
The reason is, when choose a feature to split tree node, if two features have the same split gain, the feature with smaller index(id) will be chosen.
When I train a model using LightGBM, as follow:
I run the code twice, everything is same except:
(1) the first time,
(2) the second time,
Just change the order, but the result is different:
(1) the first time:
(2) the second time:
Can anyone explain it? Thank you very much.
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