don't score an empty F1 gold reference as zero - #1354
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nltk returns None for undefined recall, and we were scoring that as 0. An empty gold is bad eval data, not a model miss. Empty preds stay 0. Co-authored-by: Cursor <cursoragent@cursor.com>
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Fixes #1353
F1_scoremaps nltk'sNoneonto0.0. That's fine when the prediction bag is empty (undefined precision → miss). It's wrong when the gold bag is empty after normalize — that's bad reference data, not a model failure, andnp.meanthen treats it like a real zero.Raise
ValueErrorfor empty gold. Empty pred still scores0.0.