From 6330fbfd3f00465aa20fe6b7ea9c6e8eb043023b Mon Sep 17 00:00:00 2001
From: Mitzi <46392144+embandera@users.noreply.github.com>
Date: Mon, 12 Jul 2021 13:23:24 -0700
Subject: [PATCH 1/3] Remove IsotonicRegression from docstrings_ignore_list

---
 maint_tools/test_docstrings.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/maint_tools/test_docstrings.py b/maint_tools/test_docstrings.py
index 32c3fa726c295..697d63e8ecb37 100644
--- a/maint_tools/test_docstrings.py
+++ b/maint_tools/test_docstrings.py
@@ -55,7 +55,6 @@
     "HuberRegressor",
     "IncrementalPCA",
     "Isomap",
-    "IsotonicRegression",
     "IterativeImputer",
     "KBinsDiscretizer",
     "KNNImputer",

From cda5f3580012e4622d775c282752dea840c2c682 Mon Sep 17 00:00:00 2001
From: Mitzi <46392144+embandera@users.noreply.github.com>
Date: Mon, 12 Jul 2021 13:56:18 -0700
Subject: [PATCH 2/3] Ensure IsotonicRegression passes numpydoc validation

---
 sklearn/isotonic.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/sklearn/isotonic.py b/sklearn/isotonic.py
index 6e5e92d409ca3..3a6cf0df87284 100644
--- a/sklearn/isotonic.py
+++ b/sklearn/isotonic.py
@@ -189,6 +189,10 @@ class IsotonicRegression(RegressorMixin, TransformerMixin, BaseEstimator):
     increasing_ : bool
         Inferred value for ``increasing``.
 
+    See Also
+    --------
+    LinearRegression : Ordinary least squares Linear Regression.
+
     Notes
     -----
     Ties are broken using the secondary method from de Leeuw, 1977.
@@ -348,7 +352,7 @@ def fit(self, X, y, sample_weight=None):
         return self
 
     def transform(self, T):
-        """Transform new data by linear interpolation
+        """Transform new data by linear interpolation.
 
         Parameters
         ----------
@@ -361,7 +365,7 @@ def transform(self, T):
         Returns
         -------
         y_pred : ndarray of shape (n_samples,)
-            The transformed data
+            The transformed data.
         """
 
         if hasattr(self, "X_thresholds_"):

From 153622781fcca0ea31a2d30e6a22ac42c7ec3c54 Mon Sep 17 00:00:00 2001
From: Guillaume Lemaitre <g.lemaitre58@gmail.com>
Date: Tue, 20 Jul 2021 16:41:21 +0200
Subject: [PATCH 3/3] apply suggestion ogrisel

---
 sklearn/isotonic.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sklearn/isotonic.py b/sklearn/isotonic.py
index 3a6cf0df87284..291a09dabf94e 100644
--- a/sklearn/isotonic.py
+++ b/sklearn/isotonic.py
@@ -191,7 +191,11 @@ class IsotonicRegression(RegressorMixin, TransformerMixin, BaseEstimator):
 
     See Also
     --------
-    LinearRegression : Ordinary least squares Linear Regression.
+    sklearn.linear_model.LinearRegression : Ordinary least squares Linear
+        Regression.
+    sklearn.ensemble.HistGradientBoostingRegressor : Gradient boosting that
+        is a non-parametric model accepting monotonicity constraints.
+    isotonic_regression : Function to solve the isotonic regression model.
 
     Notes
     -----