* Fix Horovod backend to disable progress bar on all ranks except 0
* Add join barriers
* Added changelog
* Make protected and add verbosity
* Refactor to disable progress bar callback in train
* Removed vebose setting
* Add cache check for Horovod
* Test run again
* Updated comment
* Always skip cache for Horovod
* Only reinstall when necessary
* Added separate step
* Fixed spacing
* Skip Python 3.8