{
  "name": "Flickr8k",
  "release_date": "2026-05-25",
  "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/flickr30k/utils.py:5,42 — nearest framework task (Flickr30k) uses the same pycocoevalcap corpus scorers (Bleu1-4, METEOR, ROUGE_L, CIDEr; SPICE commented out); standard Karpathy-split captioning protocol. Neither framework ships Flickr8k itself.",
        "note": "Corpus-level metrics; no per-sample correctness. mm-eval copy stores 5 reference captions per image (rows verified on all three splits). Published dataset includes train/validation/test splits; official captioning eval is on the Karpathy test split (1000 images — matches the published test split size) — evaluation runs should use test only."
      },
      "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": "id"
        },
        "answer": {
          "from": "answer",
          "optional": true
        },
        "source": {
          "format": "huggingface",
          "url": {
            "train": "https://huggingface.co/datasets/jxie/flickr8k",
            "validation": "https://huggingface.co/datasets/jxie/flickr8k",
            "test": "https://huggingface.co/datasets/jxie/flickr8k"
          }
        }
      },
      "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 Flickr8k captioning prompt."
      }
    }
  }
}