Sub-GC

This repository includes the Pytorch code for our paper "Comprehensive Image Captioning via Scene Graph Decomposition" in ECCV 2020.

[Project Page] [Paper]

Dependencies

• Python 3+
• Pytorch 1.3.0+

Python and Pytorch can be installed by anaconda, run

conda create --name ENV_NAME python=3
source activate ENV_NAME
conda install pytorch torchvision cudatoolkit=10.1 -c pytorch

where ENV_NAME and cudatoolkit version can be specified by your own.

For the other dependencies, run pip install -r requirements.txt to install.

Data

Check DATA.md for instructions of data downloading.

Model Training

To train our image captioning models, run the script

bash train.sh MODEL_TYPE

by replacing MODEL_TYPE with one of [Sub_GC_MRNN, Sub_GC_Kar, Full_GC_Kar, Sub_GC_Flickr, Sub_GC_Sup_Flickr]. MODEL_TYPE specifies the dataset, the data split and the model used for training. See details below.

1. COCO Caption Dataset

   • Sub_GC_MRNN: train a sub-graph captioning model on M-RNN split (Table 2 in our paper)
   • Sub_GC_Kar: train a sub-graph captioning model on Karpathy split (Table 3 in our paper)
   • Full_GC_Kar: train a full-graph captioning model on Karpathy split (Table 3 in our paper)

2. Flickr30K Dataset

   • Sub_GC_Flickr: train a sub-graph captioning model (Table 4 & 5 in our paper)
   • Sub_GC_Sup_Flickr: train a supervised sub-graph captioning model (Table 5 in our paper)

You can set CUDA_VISIBLE_DEVICES in train.sh to specify which GPUs are used for model training (e.g., the default script uses 2 GPUs).

Model Evaluation

The evaluation is divided into 2 steps

• The trained model is first used to generate captions
• The generated sentences are evaluated in terms of diversity, top-1 accuracy, grounding and controllability.

Caption Generation

To generate captions, run the script

bash test.sh MODEL_TYPE

by replacing MODEL_TYPE with one of [Sub_GC_MRNN, Sub_GC_S_MRNN, Sub_GC_Kar, Full_GC_Kar, Sub_GC_Flickr, Sub_GC_Flickr_GRD, Sub_GC_Flickr_CTL, Sub_GC_Sup_Flickr_CTL]. MODEL_TYPE specifies the dataset, the data split and the model used for sentence generation. See details below.

1. COCO Caption Dataset

   • Sub_GC_MRNN: use the sub-graph captioning model (Sub-GC) on M-RNN split (Table 2 in our paper)
   • Sub_GC_S_MRNN: use Sub-GC with top-k sampling (Sub-GC-S) on M-RNN split (Table 2 in our paper)
   • Sub_GC_Kar: use the sub-graph captioning model (Sub-GC) on Karpathy split (Table 3 in our paper)
   • Full_GC_Kar: use the full graph captioning model (Full-GC) on Karpathy split (Table 3 in our paper)

2. Flickr30K Dataset

   • Sub_GC_Flickr: use Sub-GC for top-1 caption accuracy evaluation (Table 4 in our paper)
   • Sub_GC_Flickr_GRD: use Sub-GC for grounding evaluation (Table 4 in our paper)
   • Sub_GC_Flickr_CTL: use Sub-GC for controllability evaluation (Table 5 in our paper)
   • Sub_GC_Sup_Flickr_CTL: use Sub-GC (Sup.) for controllability evaluation (Table 5 in our paper)

The inference results will be saved in a captions_*.npy file at the same folder as the model checkpoint (e.g., pretrained/sub_gc_MRNN). $CAPTION_FILE will be used as the name of generated captions_*.npy file in the following instructions.

Diversity Evaluation

Move the generated $CAPTION_FILE into folder misc/diversity and run

cd misc/diversity
python diversity_score.py --input_file $CAPTION_FILE

To evaluate the metric of mBLEU-4 (takes much longer time than other metrics), run

cd misc/diversity
python diversity_score.py --input_file $CAPTION_FILE --evaluate_mB4

Top-1 Accuracy Evaluation

In our paper, we report the top-1 accuracy of the best caption selected by sGPN+consensus. To reproduce the results, move the generated $CAPTION_FILE into folder misc/consensus_reranking/hypotheses_mRNN and run:

cd misc/consensus_reranking
python cr_mRNN_demo.py --input_file $CAPTION_FILE --dataset coco --split MRNN --top_k 4 

This will apply consensus reranking on the top 4 captions selected by our sGPN scores as described in our paper. The arguments of --dataset and --split specify the dataset (coco or flickr30k) and the split (MRNN or karpathy), respectively.

If you want to evaluate the top-1 caption selected by our sGPN or the top-1 accuracy for Full-GC, set --only_sent_eval to 1 in test.sh and rerun the bash file. If you want to evaluate the oracle scores which will take a few hours, set --only_sent_eval to 1 and add --orcle_num 1000 in test.sh, and rerun the bash file.

Grounding Evaluation (on Flickr30k)

In our paper, we report the grounding scores of the best caption selected by sGPN+consensus. To reproduce the results, this section requires 3 substeps:

1. Select the best caption by consensus reranking: use our sub-graph captioning model to generate captions (bash test.sh Sub_GC_Flickr_GRD), and apply consensus reranking on the top generated captions (see instruction in the section of Top-1 Accuracy Evaluation). A file named consensus_rerank_ind.npy that contains the ranking indices will be generated at misc/consensus_reranking.

2. Collect the grounding results for the best caption: move consensus_rerank_ind.npy into the same folder of the model checkpoint (e.g., pretrained/sub_gc_flickr). Run bash test.sh Sub_GC_Flickr_GRD again and grounding_file.json that contains the grounding results will be generated at the same folder of the model checkpoint.

3. Evaluate the grounding results: move grounding_file.json into misc/grounding and run cd misc/grounding; python grounding_score.py.

This section follows the implementation from grounding evaluation, which evaluates the grounding performance without beam search. To this end, we disable beam search for the grounding evaluation.

Controllability Evaluation (on Flickr30k)

After running bash test.sh MODEL_TYPE with MODEL_TYPE as Sub_GC_Flickr_CTL or Sub_GC_Sup_Flickr_CTL, an output file $CTL_CAPTION_FILE (e.g., ctl_captions_*.npy) will be generated and locate at the same folder as the model checkpoint (e.g., pretrained/sub_gc_sup_flickr). This output file stores the predicted captions which are ready for controllability evaluation.

To obtain the controllability scores, move that output file into folder misc/controllability and run

cd misc/controllability
python controllability_score.py --input_file $CTL_CAPTION_FILE

Acknowledgement

This repository was built based on Ruotian Luo's implementation for image captioning and Graph-RCNN. Partial evaluation protocols were implemented based on several code repositories, including: coco-caption, consensus reranking, grounding evaluation, and controllability evaluation.

Reference

If you are using our code, please consider citing our paper.

@inproceedings{zhong2020comprehensive,
  title={Comprehensive Image Captioning via Scene Graph Decomposition},
  author={Zhong, Yiwu and Wang, Liwei and Chen, Jianshu and Yu, Dong and Li, Yin},
  booktitle={ECCV},
  year={2020}
}