watex.utils.labels_validator

watex.utils.labels_validator(t, /, labels, return_bool=False)

Assert the validity of the label in the target and return the label or the boolean whether all items of label are in the target.

Parameters:

• t – array-like, target that is expected to contain the labels.

• labels – int, str or list of (str or int) that is supposed to be in the target t.

• return_bool – bool, default=False; returns ‘True’ or ‘False’ rather the labels if set to True.

Returns:

bool or labels; ‘True’ or ‘False’ if return_bool is set to True and labels otherwise.

Example:

>>> from watex.datasets import fetch_data
>>> from watex.utils.mlutils import cattarget, labels_validator
>>> _, y = fetch_data ('bagoue', return_X_y=True, as_frame=True)
>>> # binarize target y into [0 , 1]
>>> ybin = cattarget(y, labels=2 )
>>> labels_validator (ybin, [0, 1])
... [0, 1] # all labels exist.
>>> labels_validator (y, [0, 1, 3])
... ValueError: Value '3' is missing in the target.
>>> labels_validator (ybin, 0 )
... [0]
>>> labels_validator (ybin, [0, 5], return_bool=True ) # no raise error
... False