From c5ba21fb5e314b1ff3e3a4a1aad62fad8f191774 Mon Sep 17 00:00:00 2001
From: Nithurshen <nithurshen@gmail.com>
Date: Thu, 20 Nov 2025 10:36:33 +0530
Subject: [PATCH 1/3] [ENH] Adding TS-QUAD option to Elastic Ensemble
 Classifier

---
 .../distance_based/_elastic_ensemble.py       | 22 ++++++++++++++++++-
 .../tests/test_elastic_ensemble.py            | 14 ++++++++++++
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/aeon/classification/distance_based/_elastic_ensemble.py b/aeon/classification/distance_based/_elastic_ensemble.py
index c0b0bce805..73068a8ce3 100644
--- a/aeon/classification/distance_based/_elastic_ensemble.py
+++ b/aeon/classification/distance_based/_elastic_ensemble.py
@@ -42,7 +42,9 @@ class ElasticEnsemble(BaseClassifier):
       A ``list`` of strings identifying which distance measures to include. Valid values
       are one or more of: ``euclidean``, ``dtw``, ``wdtw``, ``ddtw``, ``wddtw``,
       ``lcss``, ``erp``, ``msm``, ``twe``. The default value ``all`` means that all
-      the previously listed distances are used.
+      the previously listed distances are used. The special value ``ts-quad`` can be
+      used to select the distance measures for the TS-QUAD ensemble: WDTW, DDTW,
+      LCSS, and MSM.
     proportion_of_param_options : float, default=1
       The proportion of the parameter grid space to search optional.
     proportion_train_in_param_finding : float, default=1
@@ -153,6 +155,17 @@ def _fit(self, X, y):
                 "euclidean",
                 "twe",
             ]
+        elif self.distance_measures == "ts-quad":
+            self._distance_measures = [
+                "wdtw",
+                "ddtw",
+                "lcss",
+                "msm",
+            ]
+            if self.verbose > 0:
+                print(  # noqa: T201
+                    "Configuring ElasticEnsemble as TS-QUAD with WDTW, DDTW, LCSS, MSM."
+                )
         else:
             self._distance_measures = self.distance_measures
 
@@ -515,6 +528,13 @@ def _get_test_params(cls, parameter_set: str = "default") -> dict | list[dict]:
                 "majority_vote": True,
                 "distance_measures": ["dtw", "ddtw", "wdtw"],
             }
+        elif parameter_set == "ts-quad":
+            return {
+                "proportion_of_param_options": 0.01,
+                "proportion_train_for_test": 0.1,
+                "majority_vote": True,
+                "distance_measures": "ts-quad",
+            }
         else:
             return {
                 "proportion_of_param_options": 0.01,
diff --git a/aeon/classification/distance_based/tests/test_elastic_ensemble.py b/aeon/classification/distance_based/tests/test_elastic_ensemble.py
index 53215dad2f..a246d6ebc6 100644
--- a/aeon/classification/distance_based/tests/test_elastic_ensemble.py
+++ b/aeon/classification/distance_based/tests/test_elastic_ensemble.py
@@ -90,3 +90,17 @@ def test_all_distance_measures():
     ee.fit(X, y)
     distances = list(ee.get_metric_params())
     assert len(distances) == 9
+
+
+def test_ts_quad_distance_measures():
+    """Test the 'ts-quad' option of the distance_measures parameter."""
+    X = np.random.random(size=(10, 1, 10))
+    y = np.array([0, 0, 0, 0, 0, 1, 1, 1, 1, 1])
+    ee = ElasticEnsemble(
+        distance_measures="ts-quad",
+        proportion_train_in_param_finding=0.2,
+        proportion_of_param_options=0.1,
+    )
+    ee.fit(X, y)
+    actual_distances = list(ee.get_metric_params())
+    assert len(actual_distances) == 4

From 0409dc096c2460400cd1cd5ec790e8793d02e122 Mon Sep 17 00:00:00 2001
From: Nithurshen <nithurshen@gmail.com>
Date: Thu, 20 Nov 2025 10:43:21 +0530
Subject: [PATCH 2/3] Adding changelog

---
 docs/changelogs/v1.3.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/changelogs/v1.3.md b/docs/changelogs/v1.3.md
index eae8566a67..6a0863237b 100644
--- a/docs/changelogs/v1.3.md
+++ b/docs/changelogs/v1.3.md
@@ -34,7 +34,7 @@ September 2025
 - [DOC] Classification notebook links ({pr}`2942`) {user}`TonyBagnall`
 
 ### Enhancements
-
+- [ENH] Implement TS-QUAD as a distance parameter for `ElasticEnsemble` ({pr}`3126`) {user}`Nithurshen`
 - [ENH] Improvements to ST transformer and classifier ({pr}`2968`) {user}`MatthewMiddlehurst`
 - [ENH] KNN n_jobs and updated kneighbours method ({pr}`2578`) {user}`chrisholder`
 - [ENH] Refactor signature code ({pr}`2943`) {user}`TonyBagnall`

From 954851b0e2c91406b035f5b83dc961be18dd4820 Mon Sep 17 00:00:00 2001
From: Nithurshen <nithurshen@gmail.com>
Date: Thu, 20 Nov 2025 10:44:02 +0530
Subject: [PATCH 3/3] Fixing changelog

---
 docs/changelogs/v1.3.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docs/changelogs/v1.3.md b/docs/changelogs/v1.3.md
index 6a0863237b..6e250984ab 100644
--- a/docs/changelogs/v1.3.md
+++ b/docs/changelogs/v1.3.md
@@ -34,6 +34,7 @@ September 2025
 - [DOC] Classification notebook links ({pr}`2942`) {user}`TonyBagnall`
 
 ### Enhancements
+
 - [ENH] Implement TS-QUAD as a distance parameter for `ElasticEnsemble` ({pr}`3126`) {user}`Nithurshen`
 - [ENH] Improvements to ST transformer and classifier ({pr}`2968`) {user}`MatthewMiddlehurst`
 - [ENH] KNN n_jobs and updated kneighbours method ({pr}`2578`) {user}`chrisholder`