Fix single update in pearson corrcoef (Lightning-AI#2019)

* fix
* changelog

Author: matsumotosan

CHANGELOG.md

@@ -50,6 +50,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+<<<<<<< HEAD
 -
 
 
@@ -77,6 +78,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed bug in `MetricCollection` when used with multiple metrics that return dicts with same keys ([#2027](https://github.com/Lightning-AI/torchmetrics/pull/2027))
 - Fixed bug in detection intersection metrics when `class_metrics=True` resulting in wrong values ([#1924](https://github.com/Lightning-AI/torchmetrics/pull/1924))
 - Fixed missing attributes `higher_is_better`, `is_differentiable` for some metrics ([#2028](https://github.com/Lightning-AI/torchmetrics/pull/2028))
+||||||| parent of cbe6f3e1 (Fix single update in pearson corrcoef (#2019))
+- Fixed support for pixelwise MSE ([#2017](https://github.com/Lightning-AI/torchmetrics/pull/2017)
+=======
+- Fixed bug in `PearsonCorrCoef` is updated on single samples at a time ([#2019](https://github.com/Lightning-AI/torchmetrics/pull/2019)
+
+
+- Fixed support for pixelwise MSE ([#2017](https://github.com/Lightning-AI/torchmetrics/pull/2017)
+>>>>>>> cbe6f3e1 (Fix single update in pearson corrcoef (#2019))
 
 
 ## [1.1.0] - 2023-08-22

src/torchmetrics/functional/regression/pearson.py

@@ -59,7 +59,6 @@ def _pearson_corrcoef_update(
     n_obs = preds.shape[0] if weights is None else weights.sum()
     cond = n_prior.mean() > 0 or n_obs == 1
 
-    # Calculate means
     if cond:
         if weights is None:
             mx_new = (n_prior * mean_x + preds.sum(0)) / (n_prior + n_obs)