3d Vqa Eval

3d-vqa-eval

SplatTalk: 3D VQA with Gaussian Splatting — Anh Thai et al. (arXiv:2503.06271, 2025)

What this evaluates

Evaluates a model's ability to answer natural language questions about 3D indoor scenes using only multi-view RGB images. It probes spatial reasoning, semantic understanding, and zero-shot generalization across different embodied agent scenarios.

Datasets

• ScanQA — total ?; splits: train (500), val (-1)
• SQA3D — total ?; splits: test (-1)
• MSR3D — total ?; splits: test (-1)

Metrics

• EM@1 (primary) — range: [0, 1]
  • Exact Match at rank 1: 1 if the predicted answer exactly matches any of the ground truth answers, 0 otherwise.
• CIDEr — range: [0, 1]
  • Standard n-gram based metric that weights rare n-grams higher to measure semantic similarity between prediction and reference.
• METEOR — range: [0, 1]
  • N-gram matching metric incorporating synonymy and stemming to measure semantic equivalence.
• ROUGE — range: [0, 1]
  • Recall-Oriented Understudy for Gisting Evaluation; measures n-gram overlap between prediction and reference.
• EM@1-Refined — range: [0, 1]
  • Refined exact match allowing for minor phrasing variations, punctuation differences, and case normalization.
• LLM-Match — range: [0, 1]
  • LLM-based scoring metric recommended by MSR3D authors to judge semantic equivalence between prediction and ground truth.

Input / output format

Input: Multi-view RGB images (uniformly sampled around the scene) and a natural language question describing an object or spatial relationship.

Output: A natural language text answer to the question.

Scoring recipe

def compute_em1(predictions, gold_answers):
    correct = 0
    for pred, golds in zip(predictions, gold_answers):
        if pred.strip().lower() in [g.strip().lower() for g in golds]:
            correct += 1
    return correct / len(predictions)

# For CIDEr, METEOR, ROUGE, use standard NLTK/ROUGE libraries.
# For LLM-Match, pass (prediction, ground_truth) to the recommended LLM judge and average binary scores.

Common pitfalls

• MSR3D evaluation is strictly zero-shot; fine-tuning on ScanQA/SQA3D can cause performance drops due to dataset distribution shift rather than model degradation.
• EM@1 uses strict string matching, so paraphrased but semantically correct answers are penalized unless EM@1-Refined is reported.
• Baselines vary in input modality (2D images vs 3D point clouds), making direct performance comparisons sensitive to input constraints rather than pure reasoning ability.

Evidence (verbatim from paper)

For ScanQA and SQA3D, we evaluate performance using standard n-gram-based metrics, specifically CIDEr, METEOR, ROUGE, EM@1, and EM@1-Refined for ScanQA, and EM@1 and EM@1-Refined for SQA3D. In contrast, for MSR3D, we utilize the LLM-Match score as recommended by the authors.

Citation

@misc{thai2025splattalk,
  title={SplatTalk: 3D VQA with Gaussian Splatting},
  author={Anh Thai et al.},
  year={2025},
  note={arXiv:2503.06271}
}

• arXiv: 2503.06271