Frechet Audio Distance in PyTorch

A lightweight library of Frechet Audio Distance (FAD) calculation.

Currently, we support:

• FAD score, with embeddings from:

  • VGGish by S. Hershey et al.

  • PANN by Kong et al.

  • CLAP by Wu et al.

  • EnCodec by Defossez et al.

• CLAP score, for text and audio matching

Installation

pip install frechet_audio_distance

Example

For FAD:

from frechet_audio_distance import FrechetAudioDistance

# to use `vggish`
frechet = FrechetAudioDistance(
    model_name="vggish",
    sample_rate=16000,
    use_pca=False, 
    use_activation=False,
    verbose=False
)
# to use `PANN`
frechet = FrechetAudioDistance(
    model_name="pann",
    sample_rate=16000,
    use_pca=False, 
    use_activation=False,
    verbose=False
)
# to use `CLAP`
frechet = FrechetAudioDistance(
    model_name="clap",
    sample_rate=48000,
    submodel_name="630k-audioset",  # for CLAP only
    verbose=False,
    enable_fusion=False,            # for CLAP only
)
# to use `EnCodec`
frechet = FrechetAudioDistance(
    model_name="encodec",
    sample_rate=48000,
    channels=2,
    verbose=False,
)

fad_score = frechet.score(
    "/path/to/background/set", 
    "/path/to/eval/set", 
    dtype="float32"
)

You can also have a look at this notebook for a better understanding of how each model is used.

For CLAP score:

from frechet_audio_distance import CLAPScore

clap = CLAPScore(
    submodel_name="630k-audioset",
    verbose=True,
    enable_fusion=False,
)

clap_score = clap.score(
    text_path="./text1/text.csv",
    audio_dir="./audio1",
    text_column="caption",
)

For more info, kindly refer to this notebook.

Save pre-computed embeddings

When computing the Frechet Audio Distance, you can choose to save the embeddings for future use.

This capability not only ensures consistency across evaluations but can also significantly reduce computation time, especially if you're evaluating multiple times using the same dataset.

# Specify the paths to your saved embeddings
background_embds_path = "/path/to/saved/background/embeddings.npy"
eval_embds_path = "/path/to/saved/eval/embeddings.npy"

# Compute FAD score while reusing the saved embeddings (or saving new ones if paths are provided and embeddings don't exist yet)
fad_score = frechet.score(
    "/path/to/background/set",
    "/path/to/eval/set",
    background_embds_path=background_embds_path,
    eval_embds_path=eval_embds_path,
    dtype="float32"
)

Result validation

Test 1: Distorted sine waves on vggish (as provided here) [notes]

FAD scores comparison w.r.t. to original implementation in google-research/frechet-audio-distance

	baseline vs test1	baseline vs test2
google-research	12.4375	4.7680
frechet_audio_distance	12.7398	4.9815

Test 2: Distorted sine waves on PANN

	baseline vs test1	baseline vs test2
frechet_audio_distance	0.000465	0.00008594

To contribute

Contributions are welcomed! Kindly raise a PR and ensure that all CI checks are passed.

NOTE: For now, the CI only checks for vggish as PANN takes a long time to download.

References

VGGish in PyTorch: https://github.com/harritaylor/torchvggish

Frechet distance implementation: https://github.com/mseitzer/pytorch-fid

Frechet Audio Distance paper: https://arxiv.org/abs/1812.08466

PANN paper: https://arxiv.org/abs/1912.10211