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<section id="networkx-2-1">
<h1>NetworkX 2.1<a class="headerlink" href="#networkx-2-1" title="Permalink to this heading">#</a></h1>
<p>Release date: 22 January 2018</p>
<p>Supports Python 2.7, 3.4, 3.5, and 3.6.</p>
<p>NetworkX is a Python package for the creation, manipulation, and study of the
structure, dynamics, and functions of complex networks.</p>
<p>For more information, please visit our <a class="reference external" href="https://networkx.org/">website</a>
and our <a class="reference external" href="https://networkx.org/documentation/latest/auto_examples/index.html">gallery of examples</a>.
Please send comments and questions to the <a class="reference external" href="http://groups.google.com/group/networkx-discuss">networkx-discuss mailing list</a>.</p>
<section id="highlights">
<h2>Highlights<a class="headerlink" href="#highlights" title="Permalink to this heading">#</a></h2>
<p>This release is the result of four months of work with 75 pull requests by
37 contributors. Highlights include:</p>
<blockquote>
<div><ul class="simple">
<li><p>Arrows for drawing DiGraph edges are vastly improved!
And an example to show them.</p></li>
<li><p>More than 12 new functions for graph generation, manipulation and/or
new graph algorithms.</p>
<ul>
<li><p>Add a large clique size heuristic function (#2830)</p></li>
<li><p>Add rooted product function (#2825)</p></li>
<li><p>Label Propagation Community Detection (#2821)</p></li>
<li><p>Minimum cycle basis (#2823)</p></li>
<li><p>Add Mycielski Operator (#2785)</p></li>
<li><p>Adds prefix_tree, dag_to_branching, and example. (#2784)</p></li>
<li><p>Add inverse_line_graph generator from #2241 (#2782)</p></li>
<li><p>Steiner tree and metric closure. (#2252)</p></li>
<li><p>Add flow based node and edge disjoint paths. (#2063)</p></li>
<li><p>Update geometric networks with new models (#2498)</p></li>
<li><p>Graph edit distance (#2729)</p></li>
<li><p>Added function for finding a k-edge-augmentation (#2572)</p></li>
</ul>
</li>
<li><p>G.name is no longer processed by graph operators. It remains as a
property mechanism to access <code class="docutils literal notranslate"><span class="pre">G.graph['name']</span></code> but the user is in
charge of updating or changing it for copies, subgraphs, unions and
other graph operations.</p></li>
</ul>
</div></blockquote>
</section>
<section id="improvements">
<h2>Improvements<a class="headerlink" href="#improvements" title="Permalink to this heading">#</a></h2>
<blockquote>
<div><ul class="simple">
<li><p>Many bug fixes, documentation changes.</p></li>
<li><p>Speed improvements especially for subgraphs.</p></li>
<li><p>Changed input variable names for functions using <code class="docutils literal notranslate"><span class="pre">**kwds</span></code>
to avoid name collisions – especially <code class="docutils literal notranslate"><span class="pre">add_node</span></code></p></li>
<li><p>New examples for arrows and spectral embedding of the grid graph.</p></li>
</ul>
</div></blockquote>
</section>
<section id="api-changes">
<h2>API Changes<a class="headerlink" href="#api-changes" title="Permalink to this heading">#</a></h2>
<ul>
<li><p>[<a class="reference external" href="https://github.com/networkx/networkx/pull/2498">#2498</a>]
In <code class="docutils literal notranslate"><span class="pre">geographical_threshold_graph</span></code>, starting in NetworkX 2.1 the parameter
<code class="docutils literal notranslate"><span class="pre">alpha</span></code> is deprecated and replaced with the customizable <code class="docutils literal notranslate"><span class="pre">p_dist</span></code>
function parameter, which defaults to r^-2
if <code class="docutils literal notranslate"><span class="pre">p_dist</span></code> is not supplied. To reproduce networks of earlier NetworkX
versions, a custom function needs to be defined and passed as the <code class="docutils literal notranslate"><span class="pre">p_dist</span></code>
parameter. For example, if the parameter <code class="docutils literal notranslate"><span class="pre">alpha</span></code> = 2 was used in NetworkX 2.0,
the custom function def custom_dist(r): r**-2 can be passed in versions >=2.1
as the parameter p_dist = custom_dist to produce an equivalent network.
Note the change in sign from +2 to -2 in this parameter change.</p></li>
<li><p>[<a class="reference external" href="https://github.com/networkx/networkx/issues/2554">#2554</a>]
New algorithms for finding k-edge-connected components and k-edge-connected
subgraphs in directed and undirected graphs. Efficient implementations are
provided for the special case of k=1 and k=2. The new functionality is
provided by:</p>
<blockquote>
<div><p><code class="xref py py-func docutils literal notranslate"><span class="pre">k_edge_components()</span></code></p>
<p><code class="xref py py-func docutils literal notranslate"><span class="pre">k_edge_subgraphs()</span></code></p>
</div></blockquote>
</li>
<li><p>[<a class="reference external" href="https://github.com/networkx/networkx/issues/2572">#2572</a>]
New algorithm finding for finding k-edge-augmentations in undirected graphs.
Efficient implementations are provided for the special case of k=1 and k=2.
New functionality is provided by:</p>
<blockquote>
<div><ul class="simple">
<li><p><code class="xref py py-func docutils literal notranslate"><span class="pre">k_edge_augmentation()</span></code></p></li>
</ul>
</div></blockquote>
</li>
<li><p>[<a class="reference external" href="https://github.com/networkx/networkx/pull/2812">#2812</a>]
Removed <code class="docutils literal notranslate"><span class="pre">bellman_ford</span></code>, please use
<code class="docutils literal notranslate"><span class="pre">bellman_ford_predecessor_and_distance</span></code>.</p></li>
<li><p>[<a class="reference external" href="https://github.com/networkx/networkx/pull/2811">#2811</a>]
Removed <code class="docutils literal notranslate"><span class="pre">to_pandas_dataframe</span></code> and <code class="docutils literal notranslate"><span class="pre">from_pandas_dataframe</span></code>, please use
<code class="docutils literal notranslate"><span class="pre">to_pandas_adjacency</span></code>, <code class="docutils literal notranslate"><span class="pre">from_pandas_adjacency</span></code>, <code class="docutils literal notranslate"><span class="pre">to_pandas_edgelist</span></code>,
or <code class="docutils literal notranslate"><span class="pre">from_pandas_edgelist</span></code>.</p></li>
<li><p>[<a class="reference external" href="https://github.com/networkx/networkx/pull/2766">#2766</a>]
Add seed keyword argument to random_layout and spring_layout</p></li>
<li><p>[<a class="reference external" href="https://github.com/networkx/networkx/pull/2776">#2776</a>]
Add threshold option to spring layout</p></li>
<li><p>[<a class="reference external" href="https://github.com/networkx/networkx/pull/2774">#2774</a>]
max_weight_matching returns set of edges</p></li>
<li><p>[<a class="reference external" href="https://github.com/networkx/networkx/pull/2753">#2753</a>]
Add directed graphs support for jit_graph reading</p></li>
<li><p>[<a class="reference external" href="https://github.com/networkx/networkx/pull/2788">#2788</a>]
Control node-border color in draw_networkx_nodes</p></li>
</ul>
</section>
<section id="deprecations">
<h2>Deprecations<a class="headerlink" href="#deprecations" title="Permalink to this heading">#</a></h2>
<ul class="simple">
<li><p>[<a class="reference external" href="https://github.com/networkx/networkx/pull/2819">#2819</a>]
Deprecate <code class="docutils literal notranslate"><span class="pre">connected_component_subgraphs</span></code>, <code class="docutils literal notranslate"><span class="pre">biconnected_component_subgraphs</span></code>,
<code class="docutils literal notranslate"><span class="pre">attracting_component_subgraphs</span></code>, <code class="docutils literal notranslate"><span class="pre">strongly_connected_component_subgraphs</span></code>,
<code class="docutils literal notranslate"><span class="pre">weakly_connected_component_subgraphs</span></code>.
Instead use: <code class="docutils literal notranslate"><span class="pre">[G.subgraph(c)</span> <span class="pre">for</span> <span class="pre">c</span> <span class="pre">in</span> <span class="pre">*_components]</span></code></p></li>
</ul>
</section>
<section id="contributors">
<h2>Contributors<a class="headerlink" href="#contributors" title="Permalink to this heading">#</a></h2>
<ul class="simple">
<li><p>Jack Amadeo</p></li>
<li><p>Boskovits</p></li>
<li><p>Daniel Bradburn</p></li>
<li><p>David Bradway</p></li>
<li><p>Ariel Chinn</p></li>
<li><p>Jon Crall</p></li>
<li><p>Rodrigo Dorantes-Gilardi</p></li>
<li><p>Bradley Ellert</p></li>
<li><p>Adam Erispaha</p></li>
<li><p>Ioannis Filippidis</p></li>
<li><p>ForFer</p></li>
<li><p>Louis Gatin</p></li>
<li><p>Aric Hagberg</p></li>
<li><p>Harry</p></li>
<li><p>Huston Hedinger</p></li>
<li><p>Charles Tapley Hoyt</p></li>
<li><p>James Lamb</p></li>
<li><p>Sanghack Lee</p></li>
<li><p>MD</p></li>
<li><p>Cole MacLean</p></li>
<li><p>Marco</p></li>
<li><p>Jarrod Millman</p></li>
<li><p>Sanggyu Nam</p></li>
<li><p>Viraj Parimi</p></li>
<li><p>Dima Pasechnik</p></li>
<li><p>Richard Penney</p></li>
<li><p>Naresh Peshwe</p></li>
<li><p>Zachary Sailer</p></li>
<li><p>Dan Schult</p></li>
<li><p>Jordi Torrents</p></li>
<li><p>John Wegis</p></li>
<li><p>aparamon</p></li>
<li><p>aweltsch</p></li>
<li><p>gfyoung</p></li>
<li><p>md0000</p></li>
<li><p>mddddd</p></li>
<li><p>talhum</p></li>
</ul>
</section>
<section id="merged-prs">
<h2>Merged PRs<a class="headerlink" href="#merged-prs" title="Permalink to this heading">#</a></h2>
<ul class="simple">
<li><p>Update Release Notes for v2.1 (#2839)</p></li>
<li><p>Update release notes (#2838)</p></li>
<li><p>Update copyright (#2837)</p></li>
<li><p>Add a large clique size heuristic function (#2830)</p></li>
<li><p>Remove automatic processing of G.name attribute (#2829)</p></li>
<li><p>Add rooted product function (#2825)</p></li>
<li><p>Label Propagation Community Detection (#2821)</p></li>
<li><p>change variable names to avoid kwargs clobber (#2824)</p></li>
<li><p>Minimum cycle basis (#2823)</p></li>
<li><p>Deprecate component_subgraphs functions (#2819)</p></li>
<li><p>Temporarily disable sphinx doctests (#2818)</p></li>
<li><p>Adjust docs for graph class edge attrib assignment (#2817)</p></li>
<li><p>Add directed graphs support for jit_graph reading (#2753)</p></li>
<li><p>Arrows as a plot example. (#2801)</p></li>
<li><p>Fix bug in len(edges) for self-loops (#2816)</p></li>
<li><p>MRG: Remove <code class="docutils literal notranslate"><span class="pre">to_pandas_dataframe</span></code> and <code class="docutils literal notranslate"><span class="pre">from_pandas_dataframe</span></code> (#2811)</p></li>
<li><p>Fix Pydot tests so works with new version 1.2.4 (#2815)</p></li>
<li><p>MRG: Remove <code class="docutils literal notranslate"><span class="pre">bellman_ford</span></code> (#2812)</p></li>
<li><p>Combine generator modules and tweak docs (#2814)</p></li>
<li><p>Legacy array printing for NumPy 1.14+ (#2810)</p></li>
<li><p>Fix rare structurally forbidden mappings bug. (#2798)</p></li>
<li><p>Digraph Arrows to fix #2757 (#2760)</p></li>
<li><p>use a generic Integral type for parameters check (#2800)</p></li>
<li><p>Control node-border color in draw_networkx_nodes (#2788)</p></li>
<li><p>Add seed keyword argument to random_layout and spring_layout (#2766)</p></li>
<li><p>Add Mycielski Operator (#2785)</p></li>
<li><p>Adds prefix_tree, dag_to_branching, and example. (#2784)</p></li>
<li><p>Add inverse_line_graph generator from #2241 (#2782)</p></li>
<li><p>Add docs for steiner_tree and metric_closure (#2783)</p></li>
<li><p>Steiner tree and metric closure. (#2252)</p></li>
<li><p>Correct docstring for weight parameter (#2781)</p></li>
<li><p>Switch to xcode 7.3 for osx_image in .travis.yml (#2780)</p></li>
<li><p>Change how sparse6 tests filenames (#2779)</p></li>
<li><p>Add flow based node and edge disjoint paths. (#2063)</p></li>
<li><p>Update geometric networks with new models (#2498)</p></li>
<li><p>[WIP] Graph edit distance 2361 (#2729)</p></li>
<li><p>max_weight_matching returns set of edges (#2774)</p></li>
<li><p>Avoid keyword and attribute clash (#2775)</p></li>
<li><p>Add threshold option to spring layout (#2776)</p></li>
<li><p>Fix bug in expected_degree_graph generator (#2773)</p></li>
<li><p>Add support for incomplete partitions in quotient_graph. (#2771)</p></li>
<li><p>Fix SOURCE_DATE_EPOCH ignored bug (#2735) (#2736)</p></li>
<li><p>Makes write_graph6 less memory-intensive. (#2299)</p></li>
<li><p>all_simple_paths should not return cycles. Fix issue #2762 (#2770)</p></li>
<li><p>Fix typo in write_gml and add test (#2769)</p></li>
<li><p>Fix bug and add checks for non-convergent fiedler_vector (#2681)</p></li>
<li><p>Dictionary comprehensions from #1700 merged conflicts (#2768)</p></li>
<li><p>Fix 2763: Typo <code class="xref py py-obj docutils literal notranslate"><span class="pre">furether</span></code> in networkx tutorial documentation (#2764)</p></li>
<li><p>Fix #2726: ensure add_path to add the first node (#2759)</p></li>
<li><p>a minor correction in docs (#2751)</p></li>
<li><p>Speedups for subgraph and copy methods (#2744)</p></li>
<li><p>fix typo in tutorial (#2746)</p></li>
<li><p>Expand documentation regarding strong connectivity (#2732)</p></li>
<li><p>Correct when we raise NetworkXNotImplemented (#2731)</p></li>
<li><p>removed list conversion from _triangles_and_degree_iter (#2725)</p></li>
<li><p>nx_shp fixes (#2721)</p></li>
<li><p>removed reference to create_using from union docs (#2722)</p></li>
<li><p>Copy graph in transitive closure algorithm. (#2718)</p></li>
<li><p>Fix dag_longest_path bug (#2703)</p></li>
<li><p>Fix for inter_community_edges (#2713)</p></li>
<li><p>Fix shortest_simple_paths. Issue #2427 (#2712)</p></li>
<li><p>Update migration_guide_from_1.x_to_2.0.rst (#2694)</p></li>
<li><p>mention <code class="xref py py-obj docutils literal notranslate"><span class="pre">doc.txt</span></code> in <code class="xref py py-obj docutils literal notranslate"><span class="pre">requirements/README.md</span></code> (#2699)</p></li>
<li><p>docs(centrality/dispersion): updating contributor email address (#2698)</p></li>
<li><p>Fixes bug #2503 by removing arrow labels (#2696)</p></li>
<li><p>Add example of spectral embedding of the grid graph (#2690)</p></li>
<li><p>Fix create_using of nx.from_pandas_adjacency() (#2693)</p></li>
<li><p>Added function for finding a k-edge-augmentation (#2572)</p></li>
<li><p>rm arg <code class="xref py py-obj docutils literal notranslate"><span class="pre">strict</span></code> from function <a class="reference internal" href="../reference/generated/networkx.drawing.nx_pydot.to_pydot.html#networkx.drawing.nx_pydot.to_pydot" title="networkx.drawing.nx_pydot.to_pydot"><code class="xref py py-obj docutils literal notranslate"><span class="pre">networkx.drawing.nx_pydot.to_pydot</span></code></a> (#2672)</p></li>
<li><p>Fixed problem parsing graphml with nodes in groups (#2644)</p></li>
<li><p>Remove unused imports (#2653)</p></li>
<li><p>Improve subgraph node iteration (#2687)</p></li>
<li><p>Added Kamada-Kawai functions to Sphinx documentation (#2680)</p></li>
<li><p>unpacked dict to provide kwargs when creating nodes from shapefiles (#2678)</p></li>
<li><p>Fix typo in documentation (#2677)</p></li>
</ul>
</section>
</section>
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