Metrics and loss structure (#28)

Co-authored-by: Ayush Chaurasia <ayush.chuararsia@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

.github/workflows/ci.yaml

@@ -54,7 +54,7 @@ jobs:
       - name: Test HUB training
         shell: python
         env:
-         APIKEY: ${{ secrets.ULTRALYTICS_HUB_APIKEY }}
+          APIKEY: ${{ secrets.ULTRALYTICS_HUB_APIKEY }}
         run: |
           import os
           import ultralytics