GitHub - xtensor-stack/xtensor-python: Python bindings for xtensor (original) (raw)

Python bindings for the xtensor C++ multi-dimensional array library.

• xtensor is a C++ library for multi-dimensional arrays enabling numpy-style broadcasting and lazy computing.
• xtensor-python enables inplace use of numpy arrays in C++ with all the benefits from xtensor
  • C++ universal function and broadcasting
  • STL - compliant APIs.
  • A broad coverage of numpy APIs (see the numpy to xtensor cheat sheet).

The Python bindings for xtensor are based on the pybind11 C++ library, which enables seamless interoperability between C++ and Python.

Installation

xtensor-python is a header-only library. We provide a package for the mamba (or conda) package manager.

mamba install -c conda-forge xtensor-python

Documentation

To get started with using xtensor-python, check out the full documentation

http://xtensor-python.readthedocs.io/

Usage

xtensor-python offers two container types wrapping numpy arrays inplace to provide an xtensor semantics

• pytensor
• pyarray.

Both containers enable the numpy-style APIs of xtensor (see the numpy to xtensor cheat sheet).

• On the one hand, pyarray has a dynamic number of dimensions. Just like numpy arrays, it can be reshaped with a shape of a different length (and the new shape is reflected on the python side).
• On the other hand pytensor has a compile time number of dimensions, specified with a template parameter. Shapes of pytensor instances are stack allocated, making pytensor a significantly faster expression than pyarray.

Example 1: Use an algorithm of the C++ standard library on a numpy array inplace.

C++ code

#include // Standard library import for std::accumulate #include <pybind11/pybind11.h> // Pybind11 import to define Python bindings #include <xtensor/core/xmath.hpp> // xtensor import for the C++ universal functions #define FORCE_IMPORT_ARRAY #include <xtensor-python/pyarray.hpp> // Numpy bindings

double sum_of_sines(xt::pyarray& m) { auto sines = xt::sin(m); // sines does not actually hold values. return std::accumulate(sines.begin(), sines.end(), 0.0); }

PYBIND11_MODULE(xtensor_python_test, m) { xt::import_numpy(); m.doc() = "Test module for xtensor python bindings";

m.def("sum_of_sines", sum_of_sines, "Sum the sines of the input values");

}

Python Code

import numpy as np import xtensor_python_test as xt

v = np.arange(15).reshape(3, 5) s = xt.sum_of_sines(v) print(s)

Outputs

Working example

Get the working example here:

• CMakeLists.txt
• main.cpp
• example.py

Example 2: Create a universal function from a C++ scalar function

C++ code

#include <pybind11/pybind11.h> #define FORCE_IMPORT_ARRAY #include <xtensor-python/pyvectorize.hpp> #include #include

namespace py = pybind11;

double scalar_func(double i, double j) { return std::sin(i) - std::cos(j); }

PYBIND11_MODULE(xtensor_python_test, m) { xt::import_numpy(); m.doc() = "Test module for xtensor python bindings";

m.def("vectorized_func", xt::pyvectorize(scalar_func), "");

}

Python Code

import numpy as np import xtensor_python_test as xt

x = np.arange(15).reshape(3, 5) y = [1, 2, 3, 4, 5] z = xt.vectorized_func(x, y) print(z)

Outputs

[[-0.540302,  1.257618,  1.89929 ,  0.794764, -1.040465],
 [-1.499227,  0.136731,  1.646979,  1.643002,  0.128456],
 [-1.084323, -0.583843,  0.45342 ,  1.073811,  0.706945]]

Installation

We provide a package for the conda package manager.

conda install -c conda-forge xtensor-python

This will pull the dependencies to xtensor-python, that is pybind11 and xtensor.

Project cookiecutter

A template for a project making use of xtensor-python is available in the form of a cookiecutter here.

This project is meant to help library authors get started with the xtensor python bindings.

It produces a project following the best practices for the packaging and distribution of Python extensions based on xtensor-python, including a setup.py file and a conda recipe.

Building and Running the Tests

Testing xtensor-python requires pytest

To pick up changes in xtensor-python while rebuilding, delete the build/ directory.

Building the HTML Documentation

xtensor-python's documentation is built with three tools

• doxygen
• sphinx
• breathe

While doxygen must be installed separately, you can install breathe by typing

Breathe can also be installed with conda

conda install -c conda-forge breathe

Finally, build the documentation with

from the docs subdirectory.

Dependencies on xtensor and pybind11

xtensor-python depends on the xtensor and pybind11 libraries

These dependencies are automatically resolved when using the conda package manager.

License

We use a shared copyright model that enables all contributors to maintain the copyright on their contributions.

This software is licensed under the BSD-3-Clause license. See the LICENSE file for details.