Enhancement:
- replace parallel_backend with parallel_config to enhance parallel processing configuration by adding prefer option in train_val.
Users can prefer backend='threading' and prefer='threads' ('processes') when try fails by setting backend='loky' or turn to download v1.6.1. If users don't need more fine-grained control over the backend configuration, download v1.9.2 can reserve all improved traits and reduce runtime of parallel_config.__init__.
download:
!pip install perming==1.9.3 # in jupyter
pip install perming==1.9.3 # in cmd