.. index:: single: knn_distance_anomaly_detector
.. _knn_distance_anomaly_detector/0:

.. rst-class:: right

**object**

``knn_distance_anomaly_detector``
=================================

k-nearest-neighbor distance anomaly detector with multiple distance metrics, mixed-feature support, and missing-value handling. Learns from baseline training examples selected from a dataset object implementing the ``anomaly_dataset_protocol`` protocol and returns a detector term that can be used for scoring, prediction, and export.

| **Availability:** 
|    ``logtalk_load(knn_distance_anomaly_detector(loader))``

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

| **Compilation flags:**
|    ``static, context_switching_calls``


| **Imports:**
|    ``public`` :ref:`anomaly_detector_common <anomaly_detector_common/0>`
| **Uses:**
|    :ref:`format <format/0>`
|    :ref:`list <list/0>`
|    :ref:`numberlist <numberlist/0>`
|    :ref:`pairs <pairs/0>`
|    :ref:`type <type/0>`

| **Remarks:**
|    (none)

| **Inherited public predicates:**
|     :ref:`anomaly_detector_protocol/0::anomaly_detector_options/2`  :ref:`anomaly_detector_protocol/0::check_anomaly_detector/1`  :ref:`options_protocol/0::check_option/1`  :ref:`options_protocol/0::check_options/1`  :ref:`options_protocol/0::default_option/1`  :ref:`options_protocol/0::default_options/1`  :ref:`anomaly_detector_protocol/0::diagnostic/2`  :ref:`anomaly_detector_protocol/0::diagnostics/2`  :ref:`anomaly_detector_protocol/0::export_to_clauses/4`  :ref:`anomaly_detector_protocol/0::export_to_file/4`  :ref:`anomaly_detector_protocol/0::learn/2`  :ref:`anomaly_detector_protocol/0::learn/3`  :ref:`options_protocol/0::option/2`  :ref:`options_protocol/0::option/3`  :ref:`anomaly_detector_protocol/0::predict/3`  :ref:`anomaly_detector_protocol/0::predict/4`  :ref:`anomaly_detector_protocol/0::print_anomaly_detector/1`  :ref:`anomaly_detector_protocol/0::score/3`  :ref:`anomaly_detector_protocol/0::score_all/3`  :ref:`anomaly_detector_protocol/0::valid_anomaly_detector/1`  :ref:`options_protocol/0::valid_option/1`  :ref:`options_protocol/0::valid_options/1`  

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

Public predicates
-----------------

(no local declarations; see entity ancestors if any)

Protected predicates
--------------------

(no local declarations; see entity ancestors if any)

Private predicates
------------------

(no local declarations; see entity ancestors if any)

Operators
---------

(none)

.. seealso::

   :ref:`anomaly_dataset_protocol <anomaly_dataset_protocol/0>`, :ref:`anomaly_detector_protocol <anomaly_detector_protocol/0>`, :ref:`isolation_forest_anomaly_detector <isolation_forest_anomaly_detector/0>`, :ref:`lof_anomaly_detector <lof_anomaly_detector/0>`