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InputTags — scikit-learn 1.8.dev0 documentation

class sklearn.utils.InputTags(one_d_array: bool = False, two_d_array: bool = True, three_d_array: bool = False, sparse: bool = False, categorical: bool = False, string: bool = False, dict: bool = False, positive_only: bool = False, allow_nan: bool = False, pairwise: bool = False)[source]#

Tags for the input data.

Parameters:

one_d_arraybool, default=False

Whether the input can be a 1D array.

two_d_arraybool, default=True

Whether the input can be a 2D array. Note that most common tests currently run only if this flag is set to True.

three_d_arraybool, default=False

Whether the input can be a 3D array.

sparsebool, default=False

Whether the input can be a sparse matrix.

categoricalbool, default=False

Whether the input can be categorical.

stringbool, default=False

Whether the input can be an array-like of strings.

dictbool, default=False

Whether the input can be a dictionary.

positive_onlybool, default=False

Whether the estimator requires positive X.

allow_nanbool, default=False

Whether the estimator supports data with missing values encoded as np.nan.

pairwisebool, default=False

This boolean attribute indicates whether the data (X), fit and similar methods consists of pairwise measures over samples rather than a feature representation for each sample. It is usually True where an estimator has a metric or affinity or kernel parameter with value ‘precomputed’. Its primary purpose is to support a meta-estimator or a cross validation procedure that extracts a sub-sample of data intended for a pairwise estimator, where the data needs to be indexed on both axes. Specifically, this tag is used by sklearn.utils.metaestimators._safe_split to slice rows and columns.

Note that if setting this tag to True means the estimator can take only positive values, the positive_only tag must reflect it and also be set to True.

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