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TensorLy is a Python library that aims at making tensor learning simple and accessible. It allows to easily perform tensor decomposition, tensor learning and tensor algebra. Its backend system allows to seamlessly perform computation with NumPy, PyTorch, JAX, MXNet, TensorFlow or CuPy, and run methods at scale on CPU or GPU.

Website: http://tensorly.org
Source-code: https://github.com/tensorly/tensorly
Jupyter Notebooks: https://github.com/JeanKossaifi/tensorly-notebooks

Installing TensorLy

The only pre-requisite is to have Python 3 installed. The easiest way is via the Anaconda distribution <https://www.anaconda.com/download/>_.

+-------------------------------------------+---------------------------------------------------+ | With pip (recommended) | With conda | +-------------------------------------------+---------------------------------------------------+ | | | | .. code:: | .. code:: | | | | | pip install -U tensorly | conda install -c tensorly tensorly | | | | | | | +-------------------------------------------+---------------------------------------------------+ | Development (from git) | +-------------------------------------------+---------------------------------------------------+ | | | .. code:: | | | | # clone the repository | | git clone https://github.com/tensorly/tensorly | | cd tensorly | | # Install in editable mode with -e or, equivalently, --editable | | pip install -e . | | | +-----------------------------------------------------------------------------------------------+

Note: TensorLy depends on NumPy by default. If you want to use the MXNet or PyTorch backends, you will need to install these packages separately.

For detailed instruction, please see the documentation <http://tensorly.org/dev/installation.html>_.

Quickstart

Creating tensors

Create a small third order tensor of size 3 x 4 x 2, from a NumPy array and perform simple operations on it:

.. code:: python

import tensorly as tl import numpy as np

tensor = tl.tensor(np.arange(24).reshape((3, 4, 2)), dtype=tl.float64) unfolded = tl.unfold(tensor, mode=0) tl.fold(unfolded, mode=0, shape=tensor.shape)

You can also create random tensors:

.. code:: python

from tensorly import random

A random tensor

tensor = random.random_tensor((3, 4, 2))

A random CP tensor in factorized form

cp_tensor = random.random_tensor(shape=(3, 4, 2), rank='same')

You can also create tensors in TT-format, Tucker, etc, see random tensors <http://tensorly.org/stable/modules/api.html#module-tensorly.random>_.

Setting the backend

You can change the backend to perform computation with a different framework. By default, the backend is NumPy, but you can also perform the computation using PyTorch, TensorFlow, MXNet, JAX or CuPy (requires to have installed them first). For instance, after setting the backend to PyTorch, all the computation is done by PyTorch, and tensors can be created on GPU:

.. code:: python

tl.set_backend('pytorch') # Or 'mxnet', 'numpy', 'tensorflow', 'cupy' or 'jax' tensor = tl.tensor(np.arange(24).reshape((3, 4, 2)), device='cuda:0') type(tensor) # torch.Tensor

Tensor decomposition

Applying tensor decomposition is easy:

.. code:: python

from tensorly.decomposition import tucker

Apply Tucker decomposition

tucker_tensor = tucker(tensor, rank=[2, 2, 2])

Reconstruct the full tensor from the decomposed form

tl.tucker_to_tensor(tucker_tensor)

We have many more decompositions <http://tensorly.org/stable/modules/api.html#module-tensorly.decomposition>_ available, be sure to check them out!

Next steps

This is just a very quick introduction to some of the basic features of TensorLy. For more information on getting started, checkout the user-guide <http://tensorly.org/dev/user_guide/index.html>_ and for a detailed reference of the functions and their documentation, refer to the API <http://tensorly.org/dev/modules/api.html>_

If you see a bug, open an issue <https://github.com/tensorly/tensorly/issues>, or better yet, a pull-request <https://github.com/tensorly/tensorly/pulls>!

Running the tests

Testing and documentation are an essential part of this package and all functions come with uni-tests and documentation.

The tests are ran using the pytest package (though you can also use nose). First install pytest::

pip install pytest

Then to run the test, simply run, in the terminal:

.. code::

pytest -v tensorly

Alternatively, you can specify for which backend you wish to run the tests:

.. code::

TENSORLY_BACKEND='numpy' pytest -v tensorly

Citing

If you use TensorLy in an academic paper, please cite [1]_::

@article{tensorly,
  author  = {Jean Kossaifi and Yannis Panagakis and Anima Anandkumar and Maja Pantic},
  title   = {TensorLy: Tensor Learning in Python},
  journal = {Journal of Machine Learning Research},
  year    = {2019},
  volume  = {20},
  number  = {26},
  pages   = {1-6},
  url     = {http://jmlr.org/papers/v20/18-277.html}
}

.. [1] Jean Kossaifi, Yannis Panagakis, Anima Anandkumar and Maja Pantic, TensorLy: Tensor Learning in Python, Journal of Machine Learning Research (JMLR), 2019, volume 20, number 26.

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