batdetect2/docs/source/how_to/define-target-classes.md

How to define target classes

Use this guide to map annotations to classification labels used during training.

1) Add classification target entries

Each entry defines a class name and matching tags.

classification_targets:
  - name: pippip
    tags:
      - key: class
        value: Pipistrellus pipistrellus
  - name: pippyg
    tags:
      - key: class
        value: Pipistrellus pygmaeus

2) Use assign_tags to control decoded output tags

If you want prediction output tags to differ from matching tags, set assign_tags explicitly.

classification_targets:
  - name: pipistrelle_group
    tags:
      - key: class
        value: Pipistrellus pipistrellus
    assign_tags:
      - key: genus
        value: Pipistrellus

3) Use match_if for complex class rules

For advanced conditions, use match_if instead of tags.

classification_targets:
  - name: long_call
    match_if:
      name: duration
      operator: gt
      seconds: 0.02

4) Confirm class names are unique

classification_targets.name values must be unique.

Related pages

• Detection-target filtering: {doc}configure-target-definitions
• ROI mapping: {doc}configure-roi-mapping
• Targets config reference: {doc}../reference/targets-config-workflow