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feat: Phase C C5 length distribution report -- length shortcut visibility for benchmark audits - #886
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…lity for benchmark audits (#886)
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Implements C5 from NEXT_100_PR_MAP: bench-length-matched control.
What
src/openamp_foundry/evidence/length_distribution_report.py:compute_length_report()+format_length_report()+LengthDistributionReportdataclassAMP_LENGTH_MIN=10,AMP_LENGTH_MAX=40— typical AMP length rangeSHORTCUT_RATIO_THRESHOLD=1.5,SHORTCUT_FRACTION_THRESHOLD=0.60length_shortcut_likely=Truewhen >=60% of positives in range AND pos/neg ratio >=1.5xWhy
AMPs tend to be 10-40 residues; a model that simply learns to predict short sequences as active will score well on naive benchmarks. This report makes that shortcut visible.
Disconfirming pass