Fused multiply-add (with a single rounding) for Python.

Last update: Nov 8, 2022

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Overview

pyfma

Fused multiply-add computes (x*y) + z with a single rounding. Useful for dot products, matrix multiplications, polynomial evaluations (e.g., with Horner's rule), Newton's method for evaluating functions, convolutions, artificial neural networks etc.

Use as

import pyfma

out = pyfma.fma(3.0, 2.0, 1.0)  # 3.0*2.0 + 1.0 = 7.0

Also works with NumPy inputs:

import numpy
import pyfma

x = numpy.random.rand(3, 4, 5)
y = numpy.random.rand(3, 4, 5)
z = numpy.random.rand(3, 4, 5)

out = pyfma.fma(x, y, z)

Built with pybind11.

Caution The C/C++ implementation of FMA in MS Windows is reportedly broken. Use with care.

Installation

pyfma can be installed from the Python Package Index, so with

pip install pyfma

you can install/upgrade.

Manual installation

For manual installation (if you're a developer or just really keen on getting the bleeding edge version of pyfma), there are two possibilities:

Get the sources, do pip install .. This does the trick most the time.
As a fallback, there's a CMake-based installation. Simply go cmake /path/to/sources/ and make.

Testing

To run the pyfma unit tests, check out this repository and type

tox

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Comments

Build failure on macOS Catalina

I have Python 3.8 installed on my Mac via MacPorts. In a new venv, doing pip install pyfma results in a failure, and looking at the errors it is caused by failing to include the flag -std=c++11. Installing requires CFLAGS='-std=c++11' pip install pyfma. My exact compiler version is Apple clang version 12.0.0 (clang-1200.0.32.2), which is the compiler that comes with Xcode 12.

opened by SerpentChris 3
fma32

Hi,

Thank you for the great tool. I am curious whether it is difficult to add support of FMA operation for float numbers additionally to the current double implementation. It would be really helpful for testing and debugging various numerical algorithms in plenty of software using float due to speed reasons.

Cheers

opened by Vutshi 1
Unmarked dependency on numpy.
Steps to reproduce:

Make and activate a fresh virtualenv.

Install pyfma via pip

Run the command python -c "import pyfma; pyfma.fma(1,2,3)"

The result is ModuleNotFoundError: No module named 'numpy'.

What I expect is to either be able to use pyfma without numpy, or for pyfma to automatically have pip download and install numpy when I install pyfma. I'm not an expert at setuptools but I think the first case requires making numpy an optional dependency, while the second case requires making numpy a required dependency.
opened by SerpentChris 0