• Information about the DCASE 2020 challenge please visit the challenge website.
• You can find discussion about the dcase challenge here: dcase-discussions.
• This task follows dcase2019-task4. More info about 2019: Turpault et al., Serizel et al.
• Papers associated: Sound separation + SED paper and SED paper
• More information about sound separation process can be found in Google repo: FUSS

• Important update 8th September 2020: Code associated to papers ss_sed_paper and sed_paper available in the branch papers_code
• 9th March 2020: update scripts to get the recorded data in the download.
• 18th March 2020: update the DESED_synth_dcase20_train_jams.taron DESED_synthetic and comment reverb since we do not use it for the baseline.
• 24th March 2020: release baseline without sound-separation
• 8th April 2020: update baseline without sound-separation. (common baseline, late integration). Rearrange the scripts download. Final metrics done. Test model on multiple operating points. Test model for sound-separation (late integration).

Python >= 3.6, pytorch >= 1.0, cudatoolkit>=9.0, pandas >= 0.24.1, scipy >= 1.2.1, pysoundfile >= 0.10.2, scaper >= 1.3.5, librosa >= 0.6.3, youtube-dl >= 2019.4.30, tqdm >= 4.31.1, ffmpeg >= 4.1, dcase_util >= 0.2.5, sed-eval >= 0.2.1, psds-eval >= 0.1.0, desed >= 1.3.0

A simplified installation procedure example is provided below for python 3.6 based Anconda distribution for Linux based system:

1. install Ananconda
2. launch conda_create_environment.sh (recommended line by line)

If you are on this repo and searching for the code assoctiated to:

• Training sound event detection on a heterogeneous dataset
• Improving sound event detection in domestic environments using sound separation

Please go to the branch papers_code.

Please check the submission_page.

The evaluation data is on this eval_zenodo_repo.

Before doing your submission, please check your submission folder for task 4 with the dedicated scripts:

• python validate_submissions.py -i <path to task 4 submission folder>

This year, a sound separation model is used: see sound-separation folder which is the fuss_repo integrated as a git subtree.

More info in Original FUSS model repo.

More info in the baseline folder.

The baseline to combine SS and SED is a late integration.

The sound separation baseline has been trained using 3 sources, so it returns:

• DESED background
• DESED foreground
• FUSS mixture

In our case, we use only the ouput of the second source.

To get the predictions of the combination of SED and SS we do as follow:

• Get the output (not binarized with threshold) of the validation soundscapes (usual SED)
• Get the output (not binarized with threshold) of the DESED foreground source from SS model.
• Take the average of both outputs.
• Apply thresholds (different for F-scores and psds)
• Apply median filtering (0.45s)

System performance are reported in term of event-based F-scores [[1]] with a 200ms collar on onsets and a 200ms / 20% of the events length collar on offsets.

Additionally, the PSDS [[2]] performance are reported.

F-scores are computed using a single operating point (threshold=0.5) while other PSDS values are computed using 50 operating points (linear from 0.01 to 0.99).

• Sound event detection baseline:

• Sound event detection + sound separation baseline

Validation roc curves

	SED baseline	SED + SS baseline
psds roc curve
psds cross-trigger curve
psds macro curve

Please refer to the PSDS paper [[2]] for more information about it. The parameters used for psds performances are:

• Detection Tolerance parameter (dtc): 0.5
• Ground Truth intersection parameter (gtc): 0.5
• Cross-Trigger Tolerance parameter (cttc): 0.3
• maximum False Positive rate (e_max): 100

The difference between the 3 performances reported:

alpha_ct is the cost of cross-trigger, alpha_st is the cost of instability across classes.

See baseline folder.

All the scripts to get the data (soundbank, generated, separated) are in the scripts folder and they use python files from data_generation folder.

In the scripts/ folder, you can find the different steps to:

• Download recorded data and synthetic material.
• Generate synthetic soundscapes
• Reverberate synthetic data (Not used in the baseline)
• Separate sources of recorded and synthetic mixtures

It is likely that you'll have download issues with the real recordings. At the end of the download, please send a mail with the TSV files created in the missing_files directory. (to Nicolas Turpault and Romain Serizel).

However, if none of the audio files have been downloaded, it is probably due to an internet, proxy problem. See Desed repo or Desed_website for more info.

• The sound event detection dataset is using desed dataset.
• To compute the separated sources, we use fuss_repo (included as sound-separation/ here (using subtree))
  • Specifically, we use fuss baseline model and sound-separation/models/dcase2020_fuss_baseline/inference.py

The dataset for sound event detection of DCASE2020 task 4 is composed of:

• Train:
  • *weak (DESED, recorded, 1 578 files)
  • *unlabel_in_domain (DESED, recorded, 14 412 files)
  • synthetic soundbank (DESED, synthetic, 2060 background (SINS only) + 1006 foreground files)
• *Validation (DESED, recorded, 1 168 files):
  • test2018 (288 files)
  • eval2018 (880 files)

• Train:
  • synthetic20/soundscapes [2584 files] (DESED)
  • synthetic20/separated_sources [2584 files] (DESED)
  • weak_ss/separated_sources [1578 folders] (uses fuss baseline_model and fuss_scripts)
  • unlabel_in_domain_ss/separated_sources [14 412 folders] (uses fuss baseline_model and fuss_scripts)
• Validation
  • validation_ss/separated_sources [1168 files] (uses fuss baseline_model and fuss_scripts)

Note: the reverberated data (see scripts) are not computed for the baseline

• Train:
  • weak
  • unlabel_in_domain
  • synthetic20/soundscapes (separated in train/valid-80%/20%)
• Validation:
  • validation

• No new training involved
• Validation:
  • validation + validation_ss/separated_sources

The weak annotations have been verified manually for a small subset of the training set. The weak annotations are provided in a tab separated csv file (.tsv) under the following format:

[filename (string)][tab][event_labels (strings)]

For example:

Y-BJNMHMZDcU_50.000_60.000.wav	Alarm_bell_ringing,Dog

Synthetic subset and validation set have strong annotations.

The minimum length for an event is 250ms. The minimum duration of the pause between two events from the same class is 150ms. When the silence between two consecutive events from the same class was less than 150ms the events have been merged to a single event. The strong annotations are provided in a tab separated csv file (.tsv) under the following format:

[filename (string)][tab][event onset time in seconds (float)][tab][event offset time in seconds (float)][tab][event_label (strings)]

For example:

YOTsn73eqbfc_10.000_20.000.wav	0.163	0.665	Alarm_bell_ringing

The free universal sound separation (FUSS) dataset [3] contains mixtures of arbitrary sources of different types for use in training sound separation models. Each 10 second mixture contains between 1 and 4 sounds.

The source clips for the mixtures are from a prerelease of FSD50k [4], [5], which is composed of Freesound content annotated with labels from the AudioSet Ontology. Using the FSD50k labels, the sound source files have been screened such that they likely only contain a single type of sound. Labels are not provided for these sound source files, and are not considered part of the challenge, although they will become available when FSD50k is released.

Train:

• 20000 mixtures

Validation:

• 1000 mixtures

If you have any problem feel free to contact Nicolas (and Romain )

• [[1]] A. Mesaros, T. Heittola, & T. Virtanen, "Metrics for polyphonic sound event detection", Applied Sciences, 6(6):162, 2016
• [[2]] C. Bilen, G. Ferroni, F. Tuveri, J. Azcarreta, S. Krstulovic, A Framework for the Robust Evaluation of Sound Event Detection.
• [[3]] Scott Wisdom, Hakan Erdogan, Daniel P. W. Ellis, Romain Serizel, Nicolas Turpault, Eduardo Fonseca, Justin Salamon, Prem Seetharaman, and John R. Hershey. What's all the fuss about free universal sound separation data? In preparation. 2020.
• [[4]] E. Fonseca, J. Pons, X. Favory, F. Font, D. Bogdanov, A. Ferraro, S. Oramas, A. Porter, and X. Serra. Freesound datasets: a platform for the creation of open audio datasets. In Proceedings of the 18th International Society for Music Information Retrieval Conference (ISMIR 2017), 486–493. Suzhou, China, 2017.
• [[5]] F. Font, G. Roma, and X. Serra. Freesound technical demo.

In Proceedings of the 21st ACM international conference on Multimedia, 411–412. ACM, 2013. [1]: http://dcase.community/documents/challenge2019/technical_reports/DCASE2019_Delphin_15.pdf [2]: https://arxiv.org/pdf/1910.08440.pdf [3]: ./ [4]: https://repositori.upf.edu/bitstream/handle/10230/33299/fonseca_ismir17_freesound.pdf [5]: mtg.upf.edu/system/files/publications/Font-Roma-Serra-ACMM-2013.pdf