{
  "benchmark": "HackerSignal v2",
  "tasks": {
    "task1_cve_linkage": {
      "name": "CVE Linkage Retrieval",
      "description": "Cross-source, temporally OOD entity grounding: map heterogeneous threat evidence to canonical CVE identifiers.",
      "type": "retrieval",
      "metrics": [
        "recall_at_1",
        "recall_at_5",
        "recall_at_10",
        "mrr"
      ],
      "splits": {
        "train": 40698,
        "val": 2551,
        "test": 550
      },
      "corpus_size": 340536
    },
    "task2_signal_detection": {
      "name": "Hacker Signal Detection",
      "description": "Two-stage: detect actionable exploit intelligence in hacker discourse, then ground to CVE context.",
      "type": "detection_and_retrieval",
      "metrics": [
        "f1_actionable",
        "precision",
        "recall",
        "recall_at_5_on_positives",
        "mrr_on_positives"
      ],
      "splits": {
        "train": 4202,
        "val": 1606,
        "test": 407
      },
      "corpus_size": 340536,
      "positive_ratio": "~1:10 negative-to-positive"
    },
    "task3_temporal_generalization": {
      "name": "Temporal Generalization (Unseen CVE Linkage)",
      "description": "Link evidence to entirely unseen CVEs (CVE-2024+). Tests prospective generalization to new vulnerabilities.",
      "type": "retrieval",
      "metrics": [
        "recall_at_1",
        "recall_at_5",
        "recall_at_10",
        "mrr"
      ],
      "splits": {
        "train": 41630,
        "val": 1776,
        "test": 393
      },
      "corpus_size": 340536,
      "constraint": "C_train \u2229 C_test = \u2205 (strictly disjoint CVE sets by year)"
    }
  }
}