fatf.utils.metrics.tools.validate_confusion_matrix

fatf.utils.metrics.tools.validate_confusion_matrix(confusion_matrix, label_index=None)[source]

Validates a confusion matrix.

This function checks whether the confusion_matrix is 2-dimensional, square, unstructured and of integer kind.

If the label_index parameter is given, it is checked to be a valid index for the given confusion matrix.

Parameters
confusion_matrixnumpy.ndarray

A confusion matrix to be validated.

label_indexinteger, optional (default=None)

An index which validity will be checked for the confusion matrix (if not None).

Returns
is_validboolean

True if the confusion matrix is valid, False otherwise.

Raises
IncorrectShapeError

The confusion matrix is not a 2-dimensional numpy array, it is not square (equal width and height) or its dimension is not at least 2x2.

IndexError

The label_index (if given) is not valid for the confusion matrix.

TypeError

The confusion matrix is not of an integer kind (e.g. int, numpy.int32, numpy.int64). The label_index is not an integer.

ValueError

The confusion matrix is a structured numpy array.