skcriteria.core.methods module

Foundational module for the creation of multi-criteria methods.

This module provides the basic components for the entire library. It defines the abstract base classes that encapsulate the logic of the transformers and aggregators.

• Transformers: These are classes in charge of pre-processing the decision matrix. They take a DecisionMatrix and return a new, modified one. Examples include data normalization, weighting, or filtering of alternatives/criteria.

• Aggregators: These classes implement the core of the multi-criteria decision-making methods. They take a DecisionMatrix and return a result, which is usually a ranking of the alternatives.

By providing this common structure, it is possible to create new methods that are compatible with the entire scikit-criteria ecosystem and, at the same time, to assemble complex decision-making processes through pipelines.

class skcriteria.core.methods.SKCMethodABC

Bases: object

Base class for all class in scikit-criteria.

Notes

All subclasses should specify:

• _skcriteria_dm_type: The type of the decision maker.

• _skcriteria_parameters: Availebe parameters.

• _skcriteria_abstract_class: If the class is abstract.

If the class is abstract all validations are turned off.

get_method_name()

Return the name of the method as string.

get_parameters()

Return the parameters of the method as dictionary.

copy(**kwargs)

Create a copy of the current SKCMethodABC instance.

Deprecated since version 0.9: Using kwargs with copy() is deprecated. Use SKCMethodABC.replace() instead.

Parameters:

**kwargs (dict, optional) – Keyword arguments to modify attributes in the copied instance. This parameter is deprecated.

Returns:

A new instance with the same data as the original.

Return type:

SKCMethodABC

See also

replace

Preferred method to create a copy with modifications.

Examples

>>> method = SKCMethodABC(...)
>>> method_copy = method.copy()

replace(**kwargs)

Create a new instance with updated parameters.

This method creates a new instance of the class with the same parameters as the current instance, but with the option to override specific parameters through kwargs.

Parameters:

**kwargs (dict) – Keyword arguments to override in the new instance. Any parameter that is valid for the class constructor can be specified.

Returns:

A new instance with updated parameters.

Return type:

SKCMethodABC

Examples

>>> method = SKCMethodABC(...)
>>> new_method = method.replace(parameter=new_value)