Resolution / small objects
Adjust resolution and the native small-object strategy only when size-slice evidence identifies the bottleneck.
Long-tail strategy
Use sampling, weighting, or class-aware augmentation only when rare-class evidence justifies it.
Crowding
Target density, matching, query, crop, or resolution behavior supported by crowded-scene diagnostics.
Localization
Tune geometry, regression, or post-processing only when localization error is material.
Schedule
Change duration or schedule from training-health evidence, not habit.
Counterfactual augmentation
Activate only when its specific context-shortcut or over-detection failure mode is observed.