🌿 Orchid Genus ID — with calibrated species abstain

Upload an orchid photo. The model (orchid-clip-v8, a BioCLIP-2 ViT-L/14 fine-tune) embeds it and ranks it against 18,858 orchid species image centroids. Telling species apart within a genus is the hard part, so a calibrated abstain names a species only when the top match clearly beats the runner-up; otherwise it gives you the genus and lists the candidate species. On the 7,137 images the threshold was tuned on, named species were correct 90% of the time and a species was named for 60% of photos; expect less on new photos.

Why abstain? Most of the model's errors are confusions between species of the same genus, so reporting the genus in those cases is more useful than a confident wrong binomial. See the write-up.