text: re-adding Chrf implementation (#2701)

* update licence

This reverts commit 663f06d.

---------

Co-authored-by: Maja Popovic <[email protected]>
(cherry picked from commit 773fb92)

CHANGELOG.md

@@ -12,7 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
--
+- Re-adding `Chrf` implementation ([#2701](https://github.com/Lightning-AI/torchmetrics/pull/2701))
 
 
 ### Changed

src/torchmetrics/functional/text/_deprecated.py

@@ -134,7 +134,14 @@ def _chrf_score(
     whitespace: bool = False,
     return_sentence_level_score: bool = False,
 ) -> Union[Tensor, Tuple[Tensor, Tensor]]:
-    """Wrapper for deprecated import."""
+    """Wrapper for deprecated import.
+
+    >>> preds = ['the cat is on the mat']
+    >>> target = [['there is a cat on the mat', 'a cat is on the mat']]
+    >>> _chrf_score(preds, target)
+    tensor(0.8640)
+
+    """
     _deprecated_root_import_func("chrf_score", "text")
     return chrf_score(
         preds=preds,