ResearchBenchmarksInformation Retrieval on TREC-COVID (logs)Follow0.908Mean Score (Head)taumode0.797760.826380.8550.88362Jun 19, 2026Evaluation ResultsMethodMethodLinksMean Score (Head)Mean Score (Tail)Tail/Head RatioTail CV (Coefficient of Variation)Tail Decaytaumodetau=0.4, k=10tau=0.4, k=102026.060.9080.890.98010.00460.0016hybridtau=0.7, k=10tau=0.7, k=102026.060.8490.820.96620.00890.003Cosinetau=1.0, k=10tau=1.0, k=102026.060.8020.7610.94860.01360.0042