ProCap: Experiment Materials

This repository contains the official experimental materials for the paper:

Imagine How to Change: Explicit Procedure Modeling for Change Captioning

It provides processed datasets, pre-trained model weights, and evaluation tools for reproducing the results reported in the paper.

📦 All materials are also available via Baidu Netdisk Extraction Code: 5h7w

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Contents

• Data
• Model Weights
• Evaluation
• Usage
• License

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Data

All datasets are preprocessed into pseudo-sequence format (.h5 files) generated by VFIformer.

Included Datasets

• CLEVR-data
  Processed pseudo-sequences for the CLEVR-Change dataset

• edit-data
  Processed pseudo-sequences for the Image-Editing-Request dataset

• spot-data
  Processed pseudo-sequences for the Spot-the-Diff dataset

• filter_files
  Confidence scores computed using CLIP4IDC

• filtered-spot-captions
  Refined captions for the Spot-the-Diff dataset

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Model Weights

This repository provides pre-trained weights for both stages in the paper.

Explicit Procedure Modeling (Stage 1)

• pretrained_vqgan – VQGAN models for each dataset
• stage1_clevr_best
• stage1_edit_best
• stage1_spot_best

Implicit Procedure Captioning (Stage 2)

• clevr_best
• edit_best
• spot_best

Note: Stage 1 checkpoints can be directly reused to initialize Stage 2 training.

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Evaluation

• densevid_eval
  Evaluation tools used for quantitative assessment

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Usage

1. Data Preparation

1. Move caption files in filtered-spot-captions to the original caption directory of the Spot-the-Diff dataset.
2. Copy the processed data folders to the original dataset root and rename them as follows:

Dataset	Folder	Rename To
CLEVR-Change	CLEVR-data	CLEVR_processed
Image-Editing-Request	edit-data	edit_processed
Spot-the-Diff	spot-data	spot_processed

3. Place filter_files in the project root directory.

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2. Model Weights

• Place pretrained_vqgan in the project root directory.
• To reuse Stage 1 weights during training, set symlink_path in training scripts as:

symlink_path="/path/to/stage1/weight/dalle.pt"

• To evaluate with pre-trained checkpoints, set resume_path in evaluation scripts as:

resume_path="/path/to/pretrained/model/model.chkpt"

3. Evaluation Tool

Place the densevid_eval directory in the project root before evaluation.

Citation

If you find our work or this repository useful, please consider citing our paper:

@inproceedings{
  sun2026imagine,
  title={Imagine How To Change: Explicit Procedure Modeling for Change Captioning},
  author={Sun, Jiayang and Guo, Zixin and Cao, Min and Zhu, Guibo and Laaksonen, Jorma},
  booktitle={The Fourteenth International Conference on Learning Representations},
  year={2026},
}

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License

This repository is released under the MIT License.