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About PyTorch 1.2.0

  • Now the master branch supports PyTorch 1.2.0 by default.
  • Due to the serious version problem (especially, MDSR functions are temporarily disabled. If you have to train/evaluate the MDSR model, please use legacy branches.


About PyTorch 1.1.0

  • There have been minor changes with the 1.1.0 update. Now we support PyTorch 1.1.0 by default, and please use the legacy branch if you prefer older version.

This repository is an official PyTorch implementation of the paper "Enhanced Deep Residual Networks for Single Image Super-Resolution" from CVPRW 2017, 2nd NTIRE. You can find the original code and more information from here.

If you find our work useful in your research or publication, please cite our work:

[1] Bee Lim, Sanghyun Son, Heewon Kim, Seungjun Nah, and Kyoung Mu Lee, "Enhanced Deep Residual Networks for Single Image Super-Resolution," 2nd NTIRE: New Trends in Image Restoration and Enhancement workshop and challenge on image super-resolution in conjunction with CVPR 2017. [PDF] [arXiv] [Slide]

  author = {Lim, Bee and Son, Sanghyun and Kim, Heewon and Nah, Seungjun and Lee, Kyoung Mu},
  title = {Enhanced Deep Residual Networks for Single Image Super-Resolution},
  booktitle = {The IEEE Conference on Computer Vision and Pattern Recognition (CVPR) Workshops},
  month = {July},
  year = {2017}

We provide scripts for reproducing all the results from our paper. You can train your model from scratch, or use a pre-trained model to enlarge your images.

Differences between Torch version

  • Codes are much more compact. (Removed all unnecessary parts.)
  • Models are smaller. (About half.)
  • Slightly better performances.
  • Training and evaluation requires less memory.
  • Python-based.


  • Python 3.6
  • PyTorch >= 1.0.0
  • numpy
  • skimage
  • imageio
  • matplotlib
  • tqdm
  • cv2 >= 3.xx (Only if you want to use video input/output)


Clone this repository into any place you want.

git clone
cd EDSR-PyTorch

Quickstart (Demo)

You can test our super-resolution algorithm with your images. Place your images in test folder. (like test/<your_image>) We support png and jpeg files.

Run the script in src folder. Before you run the demo, please uncomment the appropriate line in that you want to execute.

cd src       # You are now in */EDSR-PyTorch/src

You can find the result images from experiment/test/results folder.

Model Scale File name (.pt) Parameters **PSNR
EDSR 2 EDSR_baseline_x2 1.37 M 34.61 dB
*EDSR_x2 40.7 M 35.03 dB
3 EDSR_baseline_x3 1.55 M 30.92 dB
*EDSR_x3 43.7 M 31.26 dB
4 EDSR_baseline_x4 1.52 M 28.95 dB
*EDSR_x4 43.1 M 29.25 dB
MDSR 2 MDSR_baseline 3.23 M 34.63 dB
*MDSR 7.95 M 34.92 dB
3 MDSR_baseline 30.94 dB
*MDSR 31.22 dB
4 MDSR_baseline 28.97 dB
*MDSR 29.24 dB

*Baseline models are in experiment/model. Please download our final models from here (542MB) **We measured PSNR using DIV2K 0801 ~ 0900, RGB channels, without self-ensemble. (scale + 2) pixels from the image boundary are ignored.

You can evaluate your models with widely-used benchmark datasets:

Set5 - Bevilacqua et al. BMVC 2012,

Set14 - Zeyde et al. LNCS 2010,

B100 - Martin et al. ICCV 2001,

Urban100 - Huang et al. CVPR 2015.

For these datasets, we first convert the result images to YCbCr color space and evaluate PSNR on the Y channel only. You can download benchmark datasets (250MB). Set --dir_data <where_benchmark_folder_located> to evaluate the EDSR and MDSR with the benchmarks.

You can download some results from here. The link contains EDSR+_baseline_x4 and EDSR+_x4. Otherwise, you can easily generate result images with scripts.

How to train EDSR and MDSR

We used DIV2K dataset to train our model. Please download it from here (7.1GB).

Unpack the tar file to any place you want. Then, change the dir_data argument in src/ to the place where DIV2K images are located.

We recommend you to pre-process the images before training. This step will decode all png files and save them as binaries. Use --ext sep_reset argument on your first run. You can skip the decoding part and use saved binaries with --ext sep argument.

If you have enough RAM (>= 32GB), you can use --ext bin argument to pack all DIV2K images in one binary file.

You can train EDSR and MDSR by yourself. All scripts are provided in the src/ Note that EDSR (x3, x4) requires pre-trained EDSR (x2). You can ignore this constraint by removing --pre_train <x2 model> argument.

cd src       # You are now in */EDSR-PyTorch/src

Update log

  • Jan 04, 2018

    • Many parts are re-written. You cannot use previous scripts and models directly.
    • Pre-trained MDSR is temporarily disabled.
    • Training details are included.
  • Jan 09, 2018

    • Missing files are included (src/data/
    • Some links are fixed.
  • Jan 16, 2018

    • Memory efficient forward function is implemented.
    • Add --chop_forward argument to your script to enable it.
    • Basically, this function first split a large image to small patches. Those images are merged after super-resolution. I checked this function with 12GB memory, 4000 x 2000 input image in scale 4. (Therefore, the output will be 16000 x 8000.)
  • Feb 21, 2018

    • Fixed the problem when loading pre-trained multi-GPU model.
    • Added pre-trained scale 2 baseline model.
    • This code now only saves the best-performing model by default. For MDSR, 'the best' can be ambiguous. Use --save_models argument to keep all the intermediate models.
    • PyTorch 0.3.1 changed their implementation of DataLoader function. Therefore, I also changed my implementation of MSDataLoader. You can find it on feature/dataloader branch.
  • Feb 23, 2018

    • Now PyTorch 0.3.1 is a default. Use legacy/0.3.0 branch if you use the old version.

    • With a new src/data/ code, one can easily create new data class for super-resolution.

    • New binary data pack. (Please remove the DIV2K_decoded folder from your dataset if you have.)

    • With --ext bin, this code will automatically generate and saves the binary data pack that corresponds to previous DIV2K_decoded. (This requires huge RAM (~45GB, Swap can be used.), so please be careful.)

    • If you cannot make the binary pack, use the default setting (--ext img).

    • Fixed a bug that PSNR in the log and PSNR calculated from the saved images does not match.

    • Now saved images have better quality! (PSNR is ~0.1dB higher than the original code.)

    • Added performance comparison between Torch7 model and PyTorch models.

  • Mar 5, 2018

    • All baseline models are uploaded.
    • Now supports half-precision at test time. Use --precision half to enable it. This does not degrade the output images.
  • Mar 11, 2018

    • Fixed some typos in the code and script.
    • Now --ext img is default setting. Although we recommend you to use --ext bin when training, please use --ext img when you use --test_only.
    • Skip_batch operation is implemented. Use --skip_threshold argument to skip the batch that you want to ignore. Although this function is not exactly the same with that of Torch7 version, it will work as you expected.
  • Mar 20, 2018

    • Use --ext sep-reset to pre-decode large png files. Those decoded files will be saved to the same directory with DIV2K png files. After the first run, you can use --ext sep to save time.
    • Now supports various benchmark datasets. For example, try --data_test Set5 to test your model on the Set5 images.
    • Changed the behavior of skip_batch.
  • Mar 29, 2018

    • We now provide all models from our paper.
    • We also provide MDSR_baseline_jpeg model that suppresses JPEG artifacts in the original low-resolution image. Please use it if you have any trouble.
    • MyImage dataset is changed to Demo dataset. Also, it works more efficient than before.
    • Some codes and script are re-written.
  • Apr 9, 2018

    • VGG and Adversarial loss is implemented based on SRGAN. WGAN and gradient penalty are also implemented, but they are not tested yet.
    • Many codes are refactored. If there exists a bug, please report it.
    • D-DBPN is implemented. The default setting is D-DBPN-L.
  • Apr 26, 2018

    • Compatible with PyTorch 0.4.0
    • Please use the legacy/0.3.1 branch if you are using the old version of PyTorch.
    • Minor bug fixes
  • July 22, 2018

    • Thanks for recent commits that contains RDN and RCAN. Please see code/ to train/test those models.
    • Now the dataloader is much stable than the previous version. Please erase DIV2K/bin folder that is created before this commit. Also, please avoid using --ext bin argument. Our code will automatically pre-decode png images before training. If you do not have enough spaces(~10GB) in your disk, we recommend --ext img(But SLOW!).
  • Oct 18, 2018

    • with --pre_train download, pretrained models will be automatically downloaded from the server.
    • Supports video input/output (inference only). Try with --data_test video --dir_demo [video file directory].
  • About PyTorch 1.0.0

    • We support PyTorch 1.0.0. If you prefer the previous versions of PyTorch, use legacy branches.
    • --ext bin is not supported. Also, please erase your bin files with --ext sep-reset. Once you successfully build those bin files, you can remove -reset from the argument.


PyTorch version of the paper 'Enhanced Deep Residual Networks for Single Image Super-Resolution' (CVPRW 2017)







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