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Mimic the behavior of LightGBM for sparse array inputs #305

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hcho3 opened this issue Jul 21, 2021 · 0 comments
Open

Mimic the behavior of LightGBM for sparse array inputs #305

hcho3 opened this issue Jul 21, 2021 · 0 comments

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@hcho3
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hcho3 commented Jul 21, 2021

When given a sparse array (scipy.sparse.csr_matrix), LightGBM assigns value 0 to all features that are not present in the sparse array. Currently, Treelite converts non-present features into NaNs. We will need to add a flag to indicate that non-present features should be converted into zeros instead.

Related: microsoft/LightGBM#4468 (comment)

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