{
  "name": "NLVR2",
  "release_date": "2026-05-25",
  "subsets": {
    "main": {
      "language": [
        "en"
      ],
      "modalities": [
        "multi_image_start"
      ],
      "task_type": "vqa",
      "prompt_template": "<image><image>{{ question }}\nAnswer with True or False.",
      "mapping_from_source": {
        "media": {
          "from": "images",
          "type": "list",
          "min_items": 2,
          "max_items": 2
        },
        "id": {
          "from": "id"
        },
        "question": {
          "from": "question"
        },
        "answer": {
          "from": "answer",
          "optional": true
        },
        "extra": {
          "synset": {
            "from": "synset"
          },
          "writer": {
            "from": "writer"
          }
        },
        "source": {
          "format": "huggingface",
          "url": {
            "balanced_dev": "https://huggingface.co/datasets/lmms-lab/NLVR2",
            "balanced_test_public": "https://huggingface.co/datasets/lmms-lab/NLVR2",
            "balanced_test_unseen": "https://huggingface.co/datasets/lmms-lab/NLVR2",
            "unbalanced_dev": "https://huggingface.co/datasets/lmms-lab/NLVR2",
            "unbalanced_test_unseen": "https://huggingface.co/datasets/lmms-lab/NLVR2",
            "unbalanced_test_public": "https://huggingface.co/datasets/lmms-lab/NLVR2"
          }
        }
      },
      "prompt_template_source": {
        "origin": "official",
        "reference": "https://github.com/EvolvingLMMs-Lab/lmms-eval/blob/main/lmms_eval/tasks/nlvr2/utils.py (nlvr2_doc_to_text — two-image True/False statement evaluation)",
        "notes": "Tier 4: lmms-eval NLVR2 canonical evaluation prompt (visual entailment True/False)."
      }
    }
  }
}