From db1beca748dc2259ffdd410f75d8d2a212767e09 Mon Sep 17 00:00:00 2001
From: Kylinux <3539594143@qq.com>
Date: Sat, 21 Dec 2024 10:11:19 +0800
Subject: [PATCH 1/3] Fix/val_sample_weight error for models inherited from
 RegressionModel

---
 darts/models/forecasting/regression_model.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/darts/models/forecasting/regression_model.py b/darts/models/forecasting/regression_model.py
index 5302dc0ab1..b24b58d14f 100644
--- a/darts/models/forecasting/regression_model.py
+++ b/darts/models/forecasting/regression_model.py
@@ -588,7 +588,7 @@ def _add_val_set_to_kwargs(
             val_weights = val_weights or None
         else:
             val_sets = [(val_samples, val_labels)]
-            val_weights = val_weight
+            val_weights = [val_weight]
 
         val_set_name, val_weight_name = self.val_set_params
         return dict(kwargs, **{val_set_name: val_sets, val_weight_name: val_weights})

From 988c996ebd2a723f7fc5f6131b78fcced347e099 Mon Sep 17 00:00:00 2001
From: Kylinux <3539594143@qq.com>
Date: Sat, 21 Dec 2024 10:44:53 +0800
Subject: [PATCH 2/3] modify change log

---
 CHANGELOG.md | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad43f4371f..4ab887efe6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ but cannot always guarantee backwards compatibility. Changes that may **break co
 
 [Full Changelog](https://github.com/unit8co/darts/compare/0.31.0...master)
 
+- Fix the bug in [#2579 ](https://github.com/unit8co/darts/issues/2579) which will cause error when setting val_sample_weight when using CatBoost and XGBoost model
+
 ### For users of the library:
 
 **Improved**
@@ -1403,7 +1405,7 @@ ts: TimeSeries = AirPassengers().load()
   ```python
   # Assuming a multivariate TimeSeries named series with 3 columns or variables.
   # To apply fn to columns with names '0' and '2':
-
+  
   #old syntax
   series.map(fn, cols=['0', '2']) # returned a time series with 3 columns
   #new syntax
@@ -1415,13 +1417,13 @@ ts: TimeSeries = AirPassengers().load()
   ```python
   #old syntax
   fillna(series, fill=0)
-
+  
   #new syntax
   fill_missing_values(series, fill=0)
-
+  
   #old syntax
   auto_fillna(series, **interpolate_kwargs)
-
+  
   #new syntax
   fill_missing_values(series, fill='auto', **interpolate_kwargs)
   fill_missing_values(series, **interpolate_kwargs) # fill='auto' by default
@@ -1459,13 +1461,13 @@ ts: TimeSeries = AirPassengers().load()
     ```python
     # old syntax:
     backtest_forecasting(forecasting_model, *args, **kwargs)
-
+    
     # new syntax:
     forecasting_model.backtest(*args, **kwargs)
-
+    
     # old syntax:
     backtest_regression(regression_model, *args, **kwargs)
-
+    
     # new syntax:
     regression_model.backtest(*args, **kwargs)
     ```
@@ -1474,13 +1476,13 @@ ts: TimeSeries = AirPassengers().load()
   ```python
   # old syntax:
   multivariate_model.fit(multivariate_series, target_indices=[0, 1])
-
+  
   # new syntax:
   multivariate_model.fit(multivariate_series, multivariate_series[["0", "1"]])
-
+  
   # old syntax:
   univariate_model.fit(multivariate_series, component_index=2)
-
+  
   # new syntax:
   univariate_model.fit(multivariate_series["2"])
   ```

From ac16c5090f8c01e7eb48b4939a764f545afde9bf Mon Sep 17 00:00:00 2001
From: Kylinux <3539594143@qq.com>
Date: Sat, 21 Dec 2024 10:50:21 +0800
Subject: [PATCH 3/3] modify the statement

---
 CHANGELOG.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4ab887efe6..6e4e40f0aa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,7 @@ but cannot always guarantee backwards compatibility. Changes that may **break co
 
 [Full Changelog](https://github.com/unit8co/darts/compare/0.31.0...master)
 
-- Fix the bug in [#2579 ](https://github.com/unit8co/darts/issues/2579) which will cause error when setting val_sample_weight when using CatBoost and XGBoost model
+- Fix the bug in [#2579 ](https://github.com/unit8co/darts/issues/2579)  that causes an error when `val_sample_weight` is set in the CatBoost and XGBoost models.
 
 ### For users of the library: