What's Changed
* Add Perplexity by assaftibm in https://github.com/IBM/unitxt/pull/442
* Balance demos in fair_tos datasets by yoavkatz in https://github.com/IBM/unitxt/pull/473
* postprocessors become extensions of FieldOperator by dafnapension in https://github.com/IBM/unitxt/pull/468
* Initial UI by Roni-Friedman in https://github.com/IBM/unitxt/pull/475
* introducing text at the top of loaders.py by dafnapension in https://github.com/IBM/unitxt/pull/474
* Improve Unitxt UI and add support for multiple catalogs by Roni-Friedman in https://github.com/IBM/unitxt/pull/476
* Improve ExtractMostCommonFieldValues performance by avoiding the creation of the stream-length long list of values instead building values counter on the fly by dafnapension in https://github.com/IBM/unitxt/pull/471
* Add a new Perturbate operator that is handy for faking prediction as a perturbated version of target or for any other perturbation use cases by dafnapension in https://github.com/IBM/unitxt/pull/456
* add a card for HF xsum, a summary dataset by dafnapension in https://github.com/IBM/unitxt/pull/479
* Add QA, NER, Targeted sentiment and Generation tasks, Llama and Alpaca formats and instructions and whitespace augmentor by matanor in https://github.com/IBM/unitxt/pull/483
* Cfpb product by ilyashnil in https://github.com/IBM/unitxt/pull/485
* Improve catalog UI on documentation website by separating catalog objects to files and adding information per catalog item by matanor in https://github.com/IBM/unitxt/pull/461
* Update QA templates by matanor in https://github.com/IBM/unitxt/pull/486
* Length balancer docstring by matanor in https://github.com/IBM/unitxt/pull/487
* Add process_instance function to every mutli stream operator for easier testing and usage at instance level by elronbandel in https://github.com/IBM/unitxt/pull/488
* Add LRU caching for catalog artifact loading to minimize IO overhead and enhance performance by elronbandel in https://github.com/IBM/unitxt/pull/489
* Make postprocessors a general operator that operates on 'prediction' and on 'references' which enables the use of every possible operator as postprocessor by dafnapension in https://github.com/IBM/unitxt/pull/484
* Improve UI code presentation and organization by Roni-Friedman in https://github.com/IBM/unitxt/pull/491
* Simplify ui launching with the console command unitxt-explore by elronbandel in https://github.com/IBM/unitxt/pull/492
* Xmmlu template multilingual by gitMichal in https://github.com/IBM/unitxt/pull/493
New Contributors
* Roni-Friedman made their first contribution in https://github.com/IBM/unitxt/pull/475
**Full Changelog**: https://github.com/IBM/unitxt/compare/1.4.6...1.5.0