{
  "name": "NoCaps",
  "release_date": "2026-05-15",
  "subsets": {
    "main": {
      "language": [
        "en"
      ],
      "modalities": [
        "single_image_start"
      ],
      "task_type": "captioning",
      "score_pipeline": {
        "unsupported": "caption-metrics",
        "reason": "requires corpus-level caption metrics (CIDEr/BLEU/ROUGE/BERTScore); use the benchmark's own evaluator"
      },
      "score_params": {
        "metrics": [
          "cider",
          "bleu4",
          "meteor",
          "rouge_l"
        ]
      },
      "score_protocol": {
        "reference": "lmms-eval@lmms_eval/tasks/nocaps/utils.py:13,42-83 + nocaps_val.yaml:19-27 — pycocoevalcap corpus scoring (Bleu1-4, METEOR, ROUGE_L, CIDEr; SPICE commented out) against reference captions; VLMEvalKit@vlmeval/dataset/image_caption.py:6-38 same COCO_Caption_Scorer (Bleu/Rouge/CIDEr).",
        "note": "Corpus-level metrics; no per-sample correctness exists. NoCaps paper headline is CIDEr(+SPICE); SPICE is disabled in both frameworks (Java dep) and excluded here. mm-eval copy stores 10 reference captions per image (rows verified), matching official annotations."
      },
      "prompt_template": "<image>Provide a one-sentence caption for the provided image.",
      "mapping_from_source": {
        "media": {
          "from": "image",
          "type": "list",
          "min_items": 1,
          "max_items": 1
        },
        "id": {
          "from": "image_id"
        },
        "question": {
          "from": "image_file_name"
        },
        "answer": {
          "from": "annotations_captions",
          "optional": true
        },
        "extra": {
          "image_coco_url": {
            "from": "image_coco_url"
          },
          "image_open_images_id": {
            "from": "image_open_images_id"
          }
        },
        "source": {
          "format": "json",
          "url": {
            "validation": "https://huggingface.co/datasets/lmms-lab/NoCaps"
          }
        }
      },
      "prompt_template_source": {
        "origin": "official",
        "reference": "https://github.com/open-compass/VLMEvalKit/blob/main/vlmeval/dataset/image_caption.py (ImageCaptionDataset canonical caption prompt)",
        "notes": "Tier 3: VLMEvalKit ImageCaptionDataset canonical NoCaps captioning prompt."
      }
    }
  }
}