* cleaned up progbar
* cleaned up progbar
* cleaned up progbar
* cleaned up progbar
* cleaned up progbar
* cleaned up progbar
* cleaned up progbar
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* updated base files
* flake 8
* made validation step optional
* added no val model
* val_step can be implemented but not validation_end
* added no val end model
* added tests
* added tests
* remove class
* remove class
* remove class
* remove class
* remove class
* remove class
* remove class
* remove class
* remove class
* remove class
* remove class
* updated docs
* updated docs
* updated test
* updated test
* updated test
* updated test
* updated test
* updated test
* updated test
* updated test
* updated test
* fix pep8