batdetect2/docs/source/legacy/feature-extraction.md

Legacy feature extraction outputs

The previous BatDetect2 workflow exposed several output concepts that users may still rely on.

These included:

• cnn_feats
• spec_features
• spec_slices

Why this matters

Users exploring older notebooks or downstream analysis code often encounter these names first.

The current stack exposes a different surface centered on per-detection features plus configurable output formatters.

Migration note

There is not always a strict one-to-one replacement.

When migrating, validate which part of the old workflow you actually need:

• low-level exported features,
• spectrogram slices,
• model-internal feature vectors,
• legacy JSON output shape.

Then map that need onto the current API and output format configuration.

Related pages

• Migration guide: {doc}migration-guide
• Current features explanation: {doc}../explanation/extracted-features-and-embeddings
• Output formats reference: {doc}../reference/output-formats