This project tries to implement RecNet proposed in Reconstruction Network for Video Captioning [1], CVPR 2018.

Environment

• Ubuntu 16.04
• CUDA 9.0
• cuDNN 7.3.1
• Nvidia Geforce GTX Titan Xp 12GB

Requirements

• Java 8
• Python 2.7.12
  • PyTorch 1.0
  • Other python libraries specified in requirements.txt

How to use

Step 1. Setup python virtual environment

$ virtualenv .env
$ source .env/bin/activate
(.env) $ pip install --upgrade pip
(.env) $ pip install -r requirements.txt

Step 2. Prepare Data

1. Extract Inception-v4 [2] features from datasets, and locate them at <PROJECT ROOT>/<DATASET>/features/<DATASET>_InceptionV4.hdf5. I extracted the Inception-v4 features from here.

   Dataset	Inception-v4
   MSVD	link
   MSR-VTT	link

2. Split the dataset along with the official splits by running following:

   (.env) $ python -m splits.MSVD
   (.env) $ python -m splits.MSR-VTT
   

Step 3. Prepare Evaluation Codes

Clone evaluation codes from the official coco-evaluation repo.

(.env) $ git clone https://github.com/tylin/coco-caption.git
(.env) $ mv coco-caption/pycocoevalcap .
(.env) $ rm -rf coco-caption

Step 4. Train

• Stage 1 (Encoder-Decoder)

  (.env) $ python train.py -c configs.train_stage1
  

• Stage 2 (Encoder-Decoder-Reconstructor

  Set the pretrained_decoder_fpath of TrainConfig in configs/train_stage2.py as the checkpoint path saved at stage 1, then run

  (.env) $ python train.py -c configs.stage2
  

You can change some hyperparameters by modifying configs/train_stage1.py and configs/train_stage2.py.

Step 5. Inference

1. Set the checkpoint path by changing ckpt_fpath of RunConfig in configs/run.py.
2. Run

   (.env) $ python run.py
   

Performances

* NOTE: As you can see, the performance of RecNet does not outperform SA-LSTM. Better hyperparameters should be found out.

• MSVD

  Model	BLEU4	CIDEr	METEOR	ROUGE_L	pretrained
  SA-LSTM	45.3	76.2	31.9	64.2	-
  RecNet (global)	51.1	79.7	34.0	69.4	-
  RecNet (local)	52.3	80.3	34.1	69.8	-
  (Ours) SA-LSTM	50.9	79.6	33.4	69.6	link
  (Ours) RecNet (global)	49.9	78.7	33.2	69.7	link
  (Ours) RecNet (local)	49.8	79.4	33.2	69.6	link

• MSR-VTT

  Model	BLEU4	CIDEr	METEOR	ROUGE_L	pretrained
  SA-LSTM	36.3	39.9	25.5	58.3	-
  RecNet (global)	38.3	41.7	26.2	59.1	-
  RecNet (local)	39.1	42.7	26.6	59.3	-
  (Ours) SA-LSTM	38.0	40.2	25.6	58.1	link
  (Ours) RecNet (global)	37.4	40.0	25.5	58.0	link
  (Ours) RecNet (local)	37.9	40.9	25.7	58.3	link

References

[1] Wang, Bairui, et al. "Reconstruction Network for Video Captioning." Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition. 2018.

[2] Szegedy, Christian, et al. "Inception-v4, inception-resnet and the impact of residual connections on learning." AAAI. Vol. 4. 2017.