Single and Few-step Diffusion for Generative Speech Enhancement

This repository contains the official PyTorch implementations for the 2023 paper:

• Single and Few-step Diffusion for Generative Speech Enhancement [1]

This repository builds upon our previous work: https://github.com/sp-uhh/sgmse and https://github.com/sp-uhh/sgmse-bbed. Find audio examples here https://www.inf.uni-hamburg.de/en/inst/ab/sp/publications/crp.

Installation

• Create a new virtual environment with Python 3.8 (we have not tested other Python versions, but they may work).
• Install the package dependencies via pip install -r requirements.txt.
• If using W&B logging (default):
  • Set up a wandb.ai account
  • Log in via wandb login before running our code.
• If not using W&B logging:
  • Pass the option --no_wandb to train.py.
  • Your logs will be stored as local TensorBoard logs. Run tensorboard --logdir logs/ to see them.

Training

Training is done by executing train_resume.py and requires a checkpoint trained from https://github.com/sp-uhh/sgmse or https://github.com/sp-uhh/sgmse-bbed. Checkpoints are provided (see further below). A running example can be run with

python train_resume.py --base_dir <your_base_dir> --N_min 1 --N_max 1 --t_rsp_min 0.5 --pre_ckpt <path_to_ckpt/name_ckpt.ckpt> --batch_size 16 --t_rsp_max 0.5 --nolog --lr 0.00001 --loss_type default 
--stop_iteration_random last --inference_N 1 --inference_start 0.5

where your_base_dir should be a path to a folder containing subdirectories train/ and valid/ (optionally test/ as well). Each subdirectory must itself have two subdirectories clean/ and noisy/, with the same filenames present in both. We currently only support training with .wav files. 'path_to_ckpt/name_ckpt.ckpt' is the path to the pretrained checkpoint. We advise to set N_min, N_max, --inference_N to be the same number, also inference_start and t_rsp_max should be the same number. Moreover, stop_iteration_random has to be set to last. This command with the correct checkpoint reproduces the result from [1] for training CRP with 1 step starting the reverse process from 0.5.

To get the training set "wsj0 chime3", we refer to https://github.com/sp-uhh/sgmse and execute create_wsj0_chime3.py.

Checkpoints

Pretrained checkpoints from the first training stage: wsj0-chime3: Download https://drive.google.com/file/d/1_h7pH6o-j7GV_E69SbRQF2BMRlC8tmz_/view?usp=share_link. This is the checkpoint that was used to produce the results in https://github.com/sp-uhh/sgmse-bbed for the wsj0-chime3 dataset.

voicebank-demand: Download https://drive.google.com/file/d/1AJmEJalqJyrgZEVh-NZ2mgHdIeu-XgMz/view?usp=drive_link. This is the checkpoint where BBED was trained on VoiceBank-Demand.

Checkpoints from the second training stage: https://drive.google.com/file/d/1E0-Cr5CX7xNr_T53eVZP-1-dvlmBAJW6/view?usp=drive_link. This is the checkpoint when we load the above checkpoint (https://drive.google.com/file/d/1_h7pH6o-j7GV_E69SbRQF2BMRlC8tmz_/view?usp=share_link) and run train_resume.py with the command from above. It therefore reproduces the result from [1] (CRP one step on wsj0-chime3 with BBED).

To see all available training options, run python train.py --help. Note that the available options for the SDE and the backbone network change depending on which SDE and backbone you use. These can be set through the --sde and --backbone options.

Evaluation

To evaluate on a test set, run

python eval.py --test_dir <your_test_dir> --type <your_enhanced_dir> --ckpt <path_to_model_checkpoint>  --N 1 --reverse_starting_point 0.5

starts enhancement from 0.5 with 1 reverse step. --ckpt must be now the trained model after the second training stage, e.g. the checkpoint https://drive.google.com/file/d/1E0-Cr5CX7xNr_T53eVZP-1-dvlmBAJW6/view?usp=drive_link from above.

Citations / References

We kindly ask you to cite our paper (can be found on https://arxiv.org/abs/2309.09677) in your publication when using any of our research or code:

[1] Bunlong Lay, Jean-Marie Lermercier, Julius Richter and Timo Gerkmann. Single and Few-step Diffusion for Generative Speech Enhancement, ICASSP, 2024.