A collection of metrics for evaluating timbre dissimilarity using the TorchMetrics API

Overview

Timbre Dissimilarity Metrics

A collection of metrics for evaluating timbre dissimilarity using the TorchMetrics API

Installation

pip install -e .

Usage

import timbremetrics

datasets = timbremetrics.list_datasets()
dataset = datasets[0] # get the first timbre dataset

# MAE between target dataset and pred embedding distances
metric = timbremetrics.TimbreMAE(
    margin=0.0, dataset=dataset, distance=timbremetrics.l1
)

# get numpy audio for the timbre dataset
audio = timbremetrics.get_audio(dataset)

# get arbitrary embeddings for the timbre dataset's audio
embeddings = net(audio)

# compute the metric
metric(embeddings)

Metrics

The following metrics are implemented.

Mean Squared Error

Gives the mean squared error between the upper triangles of the predicted distance matrix and target distance matrix:

Mean squared error equation

Mean Absolute Error

Gives the mean squared error between the upper triangles of the predicted distance matrix and target distance matrix:

Mean absolute error equation

Item Rank Agreement

Gives the proportion of distances ranked per-item that match between the predicted distance matrix and target distance matrix.

Item rank agreement equation

Where idf is the indicator function given by:

Indicator function

and R_X & R_Y are distances matrices ranked per item such that each row contains the ordinal distances from the corresponding item. We also provide a top-k version which computes this metric considering only the closest k items in each row.

Triplet Agreement

Samples pseudo-triplets from the target distance matrix according to a positivity radius and margin, and returns the proportion of these triplets for which ordering is retained in the predicted distance matrix, with the margin optionally enforced.

Mantel Test

The Mantel test computes Pearson's r or Spearman's rho on the condensed form of the upper triangles of the predicted and target distance matrices. The significance of the given result can be estimated using permutation analysis.

Owner
Ben Hayes
AI & Music PhD researcher @ Centre for Digital Music, QMUL
Ben Hayes
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