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Improve documentation for graph_greedy_color #857

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27 changes: 26 additions & 1 deletion src/coloring.rs
Original file line number Diff line number Diff line change
Expand Up @@ -26,13 +26,38 @@ use petgraph::visit::NodeCount;

use rayon::prelude::*;

/// Color a PyGraph using a largest_first strategy greedy graph coloring.
/// Color a :class:`~.PyGraph` object using a greedy graph coloring algorithm
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///
/// This function uses a `largest-first` strategy as described in [1]_ and colors
/// the nodes with higher degree first.
///
/// .. note::
///
/// The coloring problem is NP-hard and this is a heuristic algorithm which
/// may not return an optimal solution.
///
/// :param PyGraph: The input PyGraph object to color
///
/// :returns: A dictionary where keys are node indices and the value is
/// the color
/// :rtype: dict
///
/// .. jupyter-execute::
///
/// import rustworkx as rx
/// from rustworkx.visualization import mpl_draw
///
/// graph = rx.generators.generalized_petersen_graph(5, 2)
/// coloring = rx.graph_greedy_color(graph)
/// colors = [coloring[node] for node in graph.node_indices()]
///
/// # Draw colored graph
/// layout = rx.shell_layout(graph, nlist=[[0, 1, 2, 3, 4],[6, 7, 8, 9, 5]])
/// mpl_draw(graph, node_color=colors, pos=layout)
///
///
/// .. [1] Adrian Kosowski, and Krzysztof Manuszewski, Classical Coloring of Graphs,
/// Graph Colorings, 2-19, 2004. ISBN 0-8218-3458-4.
#[pyfunction]
#[pyo3(text_signature = "(graph, /)")]
pub fn graph_greedy_color(py: Python, graph: &graph::PyGraph) -> PyResult<PyObject> {
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