Update CHANGELOG

CHANGELOG.md

@@ -48,6 +48,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Include a version suffix for new "last" checkpoints of later runs in the same directory ([#12902](https://github.com/PyTorchLightning/pytorch-lightning/pull/12902))
 
 
+- Show a better error message when a Metric that does not return a Tensor is logged ([#13164](https://github.com/PyTorchLightning/pytorch-lightning/pull/13164))
+
+
 - Added missing `predict_dataset` argument in `LightningDataModule.from_datasets` to create predict dataloaders ([#12942](https://github.com/PyTorchLightning/pytorch-lightning/pull/12942))
 
 
@@ -109,6 +112,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - The `WandbLogger` will now use the run name in the logs folder if it is provided, and otherwise the project name  ([#12604](https://github.com/PyTorchLightning/pytorch-lightning/pull/12604))
 
 
+- When a multi-element tensor is logged, an error is now raised instead of silently taking the mean of all elements ([#13164](https://github.com/PyTorchLightning/pytorch-lightning/pull/13164))
 
 ### Deprecated
 

src/pytorch_lightning/core/module.py

@@ -533,7 +533,6 @@ def __to_tensor(self, value: numbers.Number) -> Tensor:
 
     @staticmethod
     def __check_numel_1(value: torch.Tensor, name: str) -> None:
-        # FIXME: flatten?
         if not torch.numel(value) == 1:
             raise ValueError(
                 f"`self.log({name}, {value})` was called, but the tensor must have a single element."