HenryAI/KerasBERTv1-Data · Datasets at Hugging Face

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gen_optimizer.apply_gradients(zip(grads_gen, generator.trainable_weights))
disc_optimizer.apply_gradients(zip(grads_disc, discriminator.trainable_weights))

self.gen_loss_tracker.update_state(gen_fm_loss)
self.disc_loss_tracker.update_state(disc_loss)

return {
\"gen_loss\": self.gen_loss_tracker.result(),
\"disc_loss\": self.disc_loss_tracker.result(),
}
Training
The paper suggests that the training with dynamic shapes takes around 400,000 steps (~500 epochs). For this example, we will run it only for a single epoch (819 steps). Longer training time (greater than 300 epochs) will almost certainly provide better results.

gen_optimizer = keras.optimizers.Adam(
LEARNING_RATE_GEN, beta_1=0.5, beta_2=0.9, clipnorm=1
)
disc_optimizer = keras.optimizers.Adam(
LEARNING_RATE_DISC, beta_1=0.5, beta_2=0.9, clipnorm=1
)

# Start training
generator = create_generator((None, 1))
discriminator = create_discriminator((None, 1))

mel_gan = MelGAN(generator, discriminator)
mel_gan.compile(
gen_optimizer,
disc_optimizer,
generator_loss,
feature_matching_loss,
discriminator_loss,
)
mel_gan.fit(
train_dataset.shuffle(200).batch(BATCH_SIZE).prefetch(tf.data.AUTOTUNE), epochs=1
)
819/819 [==============================] - 641s 696ms/step - gen_loss: 0.9761 - disc_loss: 0.9350

<keras.callbacks.History at 0x7f8f702fe050>
Testing the model
The trained model can now be used for real time text-to-speech translation tasks. To test how fast the MelGAN inference can be, let us take a sample audio mel-spectrogram and convert it. Note that the actual model pipeline will not include the MelSpec layer and hence this layer will be disabled during inference. The inference input will be a mel-spectrogram processed similar to the MelSpec layer configuration.

For testing this, we will create a randomly uniformly distributed tensor to simulate the behavior of the inference pipeline.

# Sampling a random tensor to mimic a batch of 128 spectrograms of shape [50, 80]
audio_sample = tf.random.uniform([128, 50, 80])
Timing the inference speed of a single sample. Running this, you can see that the average inference time per spectrogram ranges from 8 milliseconds to 10 milliseconds on a K80 GPU which is pretty fast.

pred = generator.predict(audio_sample, batch_size=32, verbose=1)
4/4 [==============================] - 5s 280ms/step
Conclusion
The MelGAN is a highly effective architecture for spectral inversion that has a Mean Opinion Score (MOS) of 3.61 that considerably outperforms the Griffin Lim algorithm having a MOS of just 1.57. In contrast with this, the MelGAN compares with the state-of-the-art WaveGlow and WaveNet architectures on text-to-speech and speech enhancement tasks on the LJSpeech and VCTK datasets [1].

This tutorial highlights:

The advantages of using dilated convolutions that grow with the filter size
Implementation of a custom layer for on-the-fly conversion of audio waves to mel-spectrograms
Effectiveness of using the feature matching loss function for training GAN generators.
Further reading

MelGAN paper (Kundan Kumar et al.) to understand the reasoning behind the architecture and training process
For in-depth understanding of the feature matching loss, you can refer to Improved Techniques for Training GANs (Tim Salimans et al.).

Classify speakers using Fast Fourier Transform (FFT) and a 1D Convnet.

Introduction
This example demonstrates how to create a model to classify speakers from the frequency domain representation of speech recordings, obtained via Fast Fourier Transform (FFT).

It shows the following:

How to use tf.data to load, preprocess and feed audio streams into a model
How to create a 1D convolutional network with residual connections for audio classification.
Our process:

We prepare a dataset of speech samples from different speakers, with the speaker as label.
We add background noise to these samples to augment our data.
We take the FFT of these samples.
We train a 1D convnet to predict the correct speaker given a noisy FFT speech sample.
Note:

This example should be run with TensorFlow 2.3 or higher, or tf-nightly.
The noise samples in the dataset need to be resampled to a sampling rate of 16000 Hz before using the code in this example. In order to do this, you will need to have installed ffmpg.
Setup
import os
import shutil
import numpy as np

import tensorflow as tf
from tensorflow import keras

from pathlib import Path
from IPython.display import display, Audio

# Get the data from https://www.kaggle.com/kongaevans/speaker-recognition-dataset/download
# and save it to the 'Downloads' folder in your HOME directory
DATASET_ROOT = os.path.join(os.path.expanduser(\"~\"), \"Downloads/16000_pcm_speeches\")

# The folders in which we will put the audio samples and the noise samples
AUDIO_SUBFOLDER = \"audio\"
NOISE_SUBFOLDER = \"noise\"

gen_optimizer.apply_gradients(zip(grads_gen, generator.trainable_weights))

disc_optimizer.apply_gradients(zip(grads_disc, discriminator.trainable_weights))

self.gen_loss_tracker.update_state(gen_fm_loss)

self.disc_loss_tracker.update_state(disc_loss)

return {

\"gen_loss\": self.gen_loss_tracker.result(),

\"disc_loss\": self.disc_loss_tracker.result(),

}

Training

The paper suggests that the training with dynamic shapes takes around 400,000 steps (~500 epochs). For this example, we will run it only for a single epoch (819 steps). Longer training time (greater than 300 epochs) will almost certainly provide better results.

gen_optimizer = keras.optimizers.Adam(

LEARNING_RATE_GEN, beta_1=0.5, beta_2=0.9, clipnorm=1

)

disc_optimizer = keras.optimizers.Adam(

LEARNING_RATE_DISC, beta_1=0.5, beta_2=0.9, clipnorm=1

)

# Start training

generator = create_generator((None, 1))

discriminator = create_discriminator((None, 1))

mel_gan = MelGAN(generator, discriminator)

mel_gan.compile(

gen_optimizer,

disc_optimizer,

generator_loss,

feature_matching_loss,

discriminator_loss,

)

mel_gan.fit(

train_dataset.shuffle(200).batch(BATCH_SIZE).prefetch(tf.data.AUTOTUNE), epochs=1

)

819/819 [==============================] - 641s 696ms/step - gen_loss: 0.9761 - disc_loss: 0.9350

<keras.callbacks.History at 0x7f8f702fe050>

Testing the model

The trained model can now be used for real time text-to-speech translation tasks. To test how fast the MelGAN inference can be, let us take a sample audio mel-spectrogram and convert it. Note that the actual model pipeline will not include the MelSpec layer and hence this layer will be disabled during inference. The inference input will be a mel-spectrogram processed similar to the MelSpec layer configuration.

For testing this, we will create a randomly uniformly distributed tensor to simulate the behavior of the inference pipeline.

# Sampling a random tensor to mimic a batch of 128 spectrograms of shape [50, 80]

audio_sample = tf.random.uniform([128, 50, 80])

Timing the inference speed of a single sample. Running this, you can see that the average inference time per spectrogram ranges from 8 milliseconds to 10 milliseconds on a K80 GPU which is pretty fast.

pred = generator.predict(audio_sample, batch_size=32, verbose=1)

4/4 [==============================] - 5s 280ms/step

Conclusion

The MelGAN is a highly effective architecture for spectral inversion that has a Mean Opinion Score (MOS) of 3.61 that considerably outperforms the Griffin Lim algorithm having a MOS of just 1.57. In contrast with this, the MelGAN compares with the state-of-the-art WaveGlow and WaveNet architectures on text-to-speech and speech enhancement tasks on the LJSpeech and VCTK datasets [1].

This tutorial highlights:

The advantages of using dilated convolutions that grow with the filter size

Implementation of a custom layer for on-the-fly conversion of audio waves to mel-spectrograms

Effectiveness of using the feature matching loss function for training GAN generators.