Random patch scaling, performance improvements

What's Changed

• fix overwriting of prediction for multiple thresholds by @Josh-Talks in #115
• Fix/missing return statement by @shota-0129 in #118
• checkpoint_dir is a required argument by @sai8951 in #120
• Refactor and improvements by @wolny in #121

New Contributors

• @Josh-Talks made their first contribution in #115
• @shota-0129 made their first contribution in #118
• @sai8951 made their first contribution in #120

Full Changelog: 1.8.7...1.9.0