.. index:: single: kemeny_young_ranker .. _kemeny_young_ranker/0:

.. rst-class:: right

object

kemeny_young_ranker

Kemeny-Young pairwise preference ranker. Learns one deterministic consensus order from a dataset object implementing the pairwise_ranking_dataset_protocol protocol by maximizing the total agreeing pairwise preference weight over all linear orders and returns a self-describing ranker term with diagnostics that can be used for ranking and export.

| Availability: | logtalk_load(kemeny_young_ranker(loader))

| Author: Paulo Moura | Version: 1:0:0 | Date: 2026-05-06

| Compilation flags: | static, context_switching_calls

| Imports: | public :ref:`ranking_dataset_common <ranking_dataset_common/0>` | public :ref:`score_ranker_model_common <score_ranker_model_common/0>` | public :ref:`condorcet_victory_common <condorcet_victory_common/0>` | Uses: | :ref:`avltree <avltree/0>` | :ref:`list <list/0>`

| Remarks: | (none)

| Inherited public predicates: |  :ref:`options_protocol/0::check_option/1`  :ref:`options_protocol/0::check_options/1`  :ref:`ranker_protocol/0::check_ranker/1`  :ref:`options_protocol/0::default_option/1`  :ref:`options_protocol/0::default_options/1`  :ref:`ranker_protocol/0::diagnostic/2`  :ref:`ranker_protocol/0::diagnostics/2`  :ref:`ranker_protocol/0::export_to_clauses/4`  :ref:`ranker_protocol/0::export_to_file/4`  :ref:`ranking_dataset_common/0::grouped_dataset_groups/2`  :ref:`ranking_dataset_common/0::grouped_dataset_items/2`  :ref:`ranking_dataset_common/0::grouped_dataset_items/3`  :ref:`ranking_dataset_common/0::grouped_dataset_summary/2`  :ref:`ranker_protocol/0::learn/2`  :ref:`ranker_protocol/0::learn/3`  :ref:`options_protocol/0::option/2`  :ref:`options_protocol/0::option/3`  :ref:`ranking_dataset_common/0::pairwise_dataset_connected_components/2`  :ref:`ranking_dataset_common/0::pairwise_dataset_declared_items/2`  :ref:`ranking_dataset_common/0::pairwise_dataset_items/2`  :ref:`ranking_dataset_common/0::pairwise_dataset_matchups/2`  :ref:`ranking_dataset_common/0::pairwise_dataset_preferences/2`  :ref:`ranking_dataset_common/0::pairwise_dataset_summary/2`  :ref:`ranking_dataset_common/0::pairwise_dataset_win_totals/2`  :ref:`ranking_dataset_common/0::pairwise_measurement_dataset_connected_components/2`  :ref:`ranking_dataset_common/0::pairwise_measurement_dataset_declared_items/2`  :ref:`ranking_dataset_common/0::pairwise_measurement_dataset_items/2`  :ref:`ranking_dataset_common/0::pairwise_measurement_dataset_measurements/2`  :ref:`ranking_dataset_common/0::pairwise_measurement_dataset_summary/2`  :ref:`ranker_protocol/0::print_ranker/1`  :ref:`ranker_protocol/0::rank/3`  :ref:`ranker_protocol/0::ranker_options/2`  :ref:`ranker_protocol/0::scores/2`  :ref:`ranking_dataset_common/0::temporal_pairwise_dataset_connected_components/2`  :ref:`ranking_dataset_common/0::temporal_pairwise_dataset_declared_items/2`  :ref:`ranking_dataset_common/0::temporal_pairwise_dataset_games/2`  :ref:`ranking_dataset_common/0::temporal_pairwise_dataset_games/3`  :ref:`ranking_dataset_common/0::temporal_pairwise_dataset_items/2`  :ref:`ranking_dataset_common/0::temporal_pairwise_dataset_periods/2`  :ref:`ranking_dataset_common/0::temporal_pairwise_dataset_summary/2`  :ref:`options_protocol/0::valid_option/1`  :ref:`options_protocol/0::valid_options/1`  :ref:`ranker_protocol/0::valid_ranker/1`  :ref:`ranking_dataset_common/0::validate_grouped_dataset/1`  :ref:`ranking_dataset_common/0::validate_grouped_dataset/2`  :ref:`ranking_dataset_common/0::validate_pairwise_dataset/1`  :ref:`ranking_dataset_common/0::validate_pairwise_dataset/2`  :ref:`ranking_dataset_common/0::validate_pairwise_measurement_dataset/1`  :ref:`ranking_dataset_common/0::validate_pairwise_measurement_dataset/2`  :ref:`ranking_dataset_common/0::validate_temporal_pairwise_dataset/1`  :ref:`ranking_dataset_common/0::validate_temporal_pairwise_dataset/2`  

.. contents:: :local: :backlinks: top

Public predicates

.. index:: consensus_ranking/2 .. _kemeny_young_ranker/0::consensus_ranking/2:

consensus_ranking/2 ^^^^^^^^^^^^^^^^^^^^^^^

Returns the learned full-item consensus ranking selected by the Kemeny-Young optimization.

| Compilation flags: | static

| Template: | consensus_ranking(Ranker,ConsensusRanking) | Mode and number of proofs: | consensus_ranking(+compound,-list) - one

---

.. index:: consensus_score/2 .. _kemeny_young_ranker/0::consensus_score/2:

consensus_score/2 ^^^^^^^^^^^^^^^^^^^^^

Returns the maximum total pairwise agreement score of the learned consensus ranking.

| Compilation flags: | static

| Template: | consensus_score(Ranker,ConsensusScore) | Mode and number of proofs: | consensus_score(+compound,-number) - one

---

Protected predicates

(no local declarations; see entity ancestors if any)

Private predicates

(no local declarations; see entity ancestors if any)

Operators

(none)

.. seealso::

:ref:`pairwise_ranking_dataset_protocol <pairwise_ranking_dataset_protocol/0>`, :ref:`ranker_protocol <ranker_protocol/0>`, :ref:`ranked_pairs <ranked_pairs/0>`, :ref:`schulze_ranker <schulze_ranker/0>`