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PyMetis is a Python wrapper for the Metis <http://glaros.dtc.umn.edu/gkhome/views/metis>
graph partititioning software
by George Karypis, Vipin Kumar and others. It includes version 5.1.0 of Metis
and wraps it using the Pybind11 <https://pybind11.readthedocs.io/en/stable/>
wrapper generator library. So far, it only wraps the most basic graph
partitioning functionality (which is enough for my current use), but extending
it in case you need more should be quite straightforward. Using PyMetis to
partition your meshes is really easy--essentially all you need to pass into
PyMetis is an adjacency list for the graph and the number of parts you would
like.
Documentation <https://documen.tician.de/pymetis>
__ (read how things work)Conda Forge <https://anaconda.org/conda-forge/pymetis>
_ (download binary packages for Linux, macOS, Windows)Python package index <https://pypi.python.org/pypi/pymetis>
_ (download releases)C. Gohlke's Windows binaries <https://www.lfd.uci.edu/~gohlke/pythonlibs/#pymetis>
_ (download Windows binaries)Github <https://github.com/inducer/pymetis>
_ (get latest source code, file bugs)The following line should do the job::
pip install pymetis
This graph, adapted from Figure 2 of the Metis
manual <http://glaros.dtc.umn.edu/gkhome/fetch/sw/metis/manual.pdf>
_ to
use zero-based indexing,
.. image:: doc/_static/tiny_01.png
can be defined and partitioned into two graphs with
.. code:: python
import numpy as np
import pymetis
adjacency_list = [np.array([4, 2, 1]),
np.array([0, 2, 3]),
np.array([4, 3, 1, 0]),
np.array([1, 2, 5, 6]),
np.array([0, 2, 5]),
np.array([4, 3, 6]),
np.array([5, 3])]
n_cuts, membership = pymetis.part_graph(2, adjacency=adjacency_list)
# n_cuts = 3
# membership = [1, 1, 1, 0, 1, 0, 0]
nodes_part_0 = np.argwhere(np.array(membership) == 0).ravel() # [3, 5, 6]
nodes_part_1 = np.argwhere(np.array(membership) == 1).ravel() # [0, 1, 2, 4]
.. image:: doc/_static/tiny_01_partitioned.png