BEAT - elie_khoury/gmm/2

This algorithm is a legacy one. The API has changed since its implementation. New versions and forks will need to be updated.

Endpoint Groups 1

Algorithms have at least one input and one output. All algorithm endpoints are organized in groups. Groups are used by the platform to indicate which inputs and outputs are synchronized together. The first group is automatically synchronized with the channel defined by the block in which the algorithm is deployed.

Unnamed group

Endpoint Name	Data Format	Nature
features	system/array_2d_floats/1	Input
ubm	tutorial/gmm/1	Output

Parameters 2

Parameters allow users to change the configuration of an algorithm when scheduling an experiment

Name	Description	Type	Default	Range/Choices
number-of-gaussians		uint32	100
maximum-number-of-iterations		uint32	10

import bob
import numpy
from bob.machine import GMMMachine

class Algorithm:

def __init__(self):
        self.number_of_gaussians = 100
        self.max_iterations = 10
        self.data = []

def setup(self, parameters):
        self.number_of_gaussians = parameters.get('number-of-gaussians',
                                                  self.number_of_gaussians)

self.max_iterations = parameters.get('maximum-number-of-iterations',
                                             self.max_iterations)

return True

def process(self, inputs, outputs):
        self.data.append(inputs["features"].data.value)

if not(inputs.hasMoreData()):
            # create array set used for training
            training_set = numpy.vstack(self.data)

input_size = training_set.shape[1]

# create the KMeans and UBM machine
            kmeans = bob.machine.KMeansMachine(int(self.number_of_gaussians), input_size)
            ubm = bob.machine.GMMMachine(int(self.number_of_gaussians), input_size)

# create the KMeansTrainer
            kmeans_trainer = bob.trainer.KMeansTrainer()
            kmeans_trainer.initialization_method = bob.trainer.KMeansTrainer.RANDOM_NO_DUPLICATE
            kmeans_trainer.max_iterations = int(self.max_iterations)
            kmeans_trainer.convergence_threshold = 0.0001
            kmeans_trainer.rng = bob.core.random.mt19937(5489)

# train using the KMeansTrainer
            kmeans_trainer.train(kmeans, training_set)

(variances, weights) = kmeans.get_variances_and_weights_for_each_cluster(training_set)
            means = kmeans.means

# initialize the GMM
            ubm.means = means
            ubm.variances = variances
            ubm.weights = weights

# train the GMM
            trainer = bob.trainer.ML_GMMTrainer(True, True, True)
            trainer.max_iterations = int(self.max_iterations)
            trainer.convergence_threshold = 0.0001
            trainer.rng = bob.core.random.mt19937(5489)
            trainer.train(ubm, training_set)

# outputs data
            outputs["ubm"].write({
                'weights':              ubm.weights,
                'means':                ubm.means,
                'variances':            ubm.variances,
                'variance_thresholds':  ubm.variance_thresholds,
            })

return True

The code for this algorithm in Python
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For a Gaussian Mixture Models (GMM), this algorithm implements the Universal Background Model (UBM) training described in the paper: Reynolds, Douglas A., Thomas F. Quatieri, and Robert B. Dunn. "Speaker verification using adapted Gaussian mixture models." Digital signal processing 10.1 (2000): 19-41.

First, this algorithm estimates the means, diagonal covariance matrix and the weights of each gaussian component using the KMeans clustering. After only the means are re-estimated using the Maximum Likelihood estimator.

This algorithm relies on the Bob library.

The following parameters are configurable:

'number-of-gaussians': The number of Gaussian Components
'maximum-number-of-iterations': The maximum number of iterations for the EM algorithm.

No experiments are using this algorithm.

This algorithm was never executed.

algorithms elie_khoury gmm 2

Endpoint Groups 1

Unnamed group

Parameters 2

algorithms

elie_khoury

gmm

2