rollback ds config changes (#2395)
* rollback ds config changes
* fix format
* Fix error when output_file is a relative path without a prefix (#2397)
Co-authored-by: Benjamin Steenhoek <benjaminjsteenhoek@gmail.com>
* fix restuls and exprs path to use absolute path
* write out optimial config after tuning
* fix format
* assert tuning result dir creation
Co-authored-by: Benjamin Steenhoek <benjaminjsteenhoek@gmail.com>
Co-authored-by: Michael Wyatt <michaelwyatt@microsoft.com>
