num_threads and finetuning_epoch_fraction CLI defaults overwrite user config

[ka-bu]

Rasa Open Source version

3.0.0

Rasa SDK version

No response

Rasa X version

No response

Python version

3.8

What operating system are you using?

OSX

What happened?

In default_recipe.py, _extra_config_from_cli will always return something for the num_threads (and for the finetuning fraction, if we're in finetuning mode) (because otherwise the cli_parameter[param] call would fail). If the user does not specify any CLI parameters then that something are the default (CLI) parameters which will then overwrite the user settings:

To reproduce this, e.g. create a config with MITIE components and set the num_threads

pipeline:
- name: "MitieNLP"
  model: "<add-your-path-here>/total_word_feature_extractor.dat"
- name: "MitieTokenizer"
- name: "MitieFeaturizer"
- name: "MitieEntityExtractor"
- name: "MitieIntentClassifier"
  num_threads: 200000

and add a breakpoint to _add_nlu_train_mode

Command / Request

No response

Relevant log output

No response

Definition of done

• Ensure that num_threads can be set
• Determine a way to test this properly
• Add a test