README.md

Time Series Generative Modeling (TSGM)

Documentation | Tutorials

About TSGM

TSGM is an open-source framework for synthetic time series generation and augmentation.

The framework can be used for:

• creating synthetic data, using historical data, black-box models, or a combined approach,
• augmenting time series data,
• evaluating synthetic data with respect to consistency, privacy, downstream performance, and more.

Install TSGM

pip install tsgm

Train your generative model

• Introductory Tutorial "Getting started with TSGM"
• Tutorial on using Time Series Augmentations
• Tutorial on using multiple GPUs or TPU with TSGM

For more examples, see our tutorials.

import tsgm

# ... Define hyperparameters ...
# dataset is a tensor of shape n_samples x seq_len x feature_dim

# Zoo contains several prebuilt architectures: we choose a conditional GAN architecture
architecture = tsgm.models.architectures.zoo["cgan_base_c4_l1"](
    seq_len=seq_len, feat_dim=feature_dim,
    latent_dim=latent_dim, output_dim=0)
discriminator, generator = architecture.discriminator, architecture.generator

# Initialize GAN object with selected discriminator and generator
gan = tsgm.models.cgan.GAN(
    discriminator=discriminator, generator=generator, latent_dim=latent_dim
)
gan.compile(
    d_optimizer=keras.optimizers.Adam(learning_rate=0.0003),
    g_optimizer=keras.optimizers.Adam(learning_rate=0.0003),
    loss_fn=keras.losses.BinaryCrossentropy(from_logits=True),
)
gan.fit(dataset, epochs=N_EPOCHS)

# Generate 100 synthetic samples
result = gan.generate(100)

Getting started

We provide:

• Documentation with a complete overview of the implemented methods,
• Tutorials that describe practical use-cases of the framework.

For contributors

git clone github.com/AlexanderVNikitin/tsgm
cd tsgm
pip install -e .

Run tests:

python -m pytest

To check static typing:

mypy

CLI

We provide two CLIs for convenient synthetic data generation:

• tsgm-gd generates data by a stored sample,
• tsgm-eval evaluates the generated time series.

Use tsgm-gd --help or tsgm-eval --help for documentation.

Datasets

TSGM provides API for convenient use of many time-series datasets (currently more than 15 datasets). The comprehensive list of the datasets in the documentation

Augmentations

TSGM provides a number of time series augmentations.

Augmentation	Class in TSGM	Reference
Gaussian Noise / Jittering	tsgm.augmentations.GaussianNoise	-
Slice-And-Shuffle	tsgm.augmentations.SliceAndShuffle	-
Shuffle features	tsgm.augmentations.Shuffle	-
Magnitude warping	tsgm.augmentations.MagnitudeWarping	Data Augmentation of Wearable Sensor Data for Parkinson’s Disease Monitoring using Convolutional Neural Networks
Window warping	tsgm.augmentations.WindowWarping	Data Augmentation for Time Series Classification using Convolutional Neural Networks

Contributing

We appreciate all contributions. To learn more, please check CONTRIBUTING.md.

Citing

If you find this repo useful, please consider citing our paper:

@article{
  nikitin2023tsgm,
  title={TSGM: A Flexible Framework for Generative Modeling of Synthetic Time Series},
  author={Nikitin, Alexander and Iannucci, Letizia and Kaski, Samuel},
  journal={arXiv preprint arXiv:2305.11567},
  year={2023}
}

License

Apache License 2.0