Merge pull request #8062 from RasaHQ/prepare-release-2.3.4

prepared release of version 2.3.4

CHANGELOG.mdx

@@ -16,6 +16,27 @@ https://github.com/RasaHQ/rasa/tree/main/changelog/ . -->
 
 <!-- TOWNCRIER -->
 
+## [2.3.4] - 2021-02-26
+
+
+### Bugfixes
+- [#8014](https://github.com/rasahq/rasa/issues/8014): Setting `model_confidence=cosine` in `DIETClassifier`, `ResponseSelector` and `TEDPolicy` is deprecated and will no longer be available. This was introduced in Rasa Open Source version `2.3.0` but post-release experiments suggest that using cosine similarity as model's confidences can change the ranking of predicted labels which is wrong.
+
+  `model_confidence=inner` is deprecated and is replaced by `model_confidence=linear_norm` as the former produced an unbounded range of confidences which broke the logic of assistants in various other places.
+
+  We encourage you to try `model_confidence=linear_norm` which will produce a linearly normalized version of dot product similarities with each value in the range `[0,1]`. This can be done with the following config:
+  ```yaml
+  - name: DIETClassifier
+    model_confidence: linear_norm
+    constrain_similarities: True
+  ```
+  This should ease up [tuning fallback thresholds](./fallback-handoff.mdx#fallbacks) as confidences for wrong predictions are better distributed across the range `[0, 1]`.
+
+  If you trained a model with `model_confidence=cosine` or `model_confidence=inner` setting using previous versions of Rasa Open Source, please re-train by either removing the `model_confidence` option from the configuration or setting it to `linear_norm`.
+
+  `model_confidence=cosine` is removed from the configuration generated by [auto-configuration](model-configuration.mdx#suggested-config).
+
+
 ## [2.3.3] - 2021-02-25
 
 

pyproject.toml

@@ -9,7 +9,7 @@ exclude = "((.eggs | .git | .pytest_cache | build | dist))"
 
 [tool.poetry]
 name = "rasa"
-version = "2.3.3"
+version = "2.3.4"
 description = "Open source machine learning framework to automate text- and voice-based conversations: NLU, dialogue management, connect to Slack, Facebook, and more - Create chatbots and voice assistants"
 authors = [ "Rasa Technologies GmbH <hi@rasa.com>",]
 maintainers = [ "Tom Bocklisch <tom@rasa.com>",]

rasa/version.py

@@ -1,3 +1,3 @@
 # this file will automatically be changed,
 # do not add anything but the version number here!
-__version__ = "2.3.3"
+__version__ = "2.3.4"