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[docs] update categorical feature description in Advanced Topics #5044

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Mar 5, 2022
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[docs] update categorical feature description in Advanced Topics #5044

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Update Advanced-Topics.rst
StrikerRUS Mar 2, 2022
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Merge branch 'master' into cat_feature_doc
StrikerRUS Mar 3, 2022
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2 changes: 1 addition & 1 deletion docs/Advanced-Topics.rst
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Expand Up @@ -23,7 +23,7 @@ Categorical Feature Support
- Use ``categorical_feature`` to specify the categorical features.
Refer to the parameter ``categorical_feature`` in `Parameters <./Parameters.rst#categorical_feature>`__.

- Categorical features will be cast to ``int32`` so they must be encoded as non-negative integers (negative values will be treated as missing)
- Categorical features will be cast to ``int32`` (integer codes will be extracted from pandas categoricals in the Python-package) so they must be encoded as non-negative integers (negative values will be treated as missing)
less than ``Int32.MaxValue`` (2147483647).
It is best to use a contiguous range of integers started from zero.
Floating point numbers in categorical features will be rounded towards 0.
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