Refactored MLPAlgorithm, no need for config in init, udated doc-strings, and unit test

2 jobs for no_configs in 7 minutes and 21 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed build_linux_36 #157057
docker

00:07:21

79.0%
passed build_macosx_36 #157058
macosx

00:01:52