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- Add ccache with persistent GitHub Actions cache to all C++ build workflows (main, package, examples) for dramatically faster rebuilds - Reduce Python/NetworKit wheel builds on PRs to cp313 only (3 jobs instead of 27 for Python, 1 instead of 4 for NetworKit); full matrix still runs on pushes and release tags - Print ccache statistics after builds for observability Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Return std::vector<uint64_t> from C++ instead of NetworKit::Partition to avoid Cython struct size mismatch (expected 96 bytes, got 72) caused by networkit version differences between build and runtime. Construct the Partition on the Python side via networkit.Partition(data=vec). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The previous fix changed C++ return types but `from networkit.graph cimport _Graph, Graph` still transitively pulled in networkit.structures.Partition through the .pxd chain, causing binary incompatibility in manylinux builds. Declare NetworKit::Graph directly via cdef extern and extract the C++ pointer through the Python object's _this attribute instead. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
networkit 11.2 is unavailable for the Nix build. Revert to 11.1.post1 which is already used in flake.nix. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
cibuildwheel downloads virtualenv.pyz from GitHub on each run, which can fail with HTTP 429 (Too Many Requests). Caching the cibuildwheel cache directory ensures virtualenv is reused across runs. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…dings The previous approach tried to access networkit's Graph._this cdef attribute from Cython without cimporting, which fails because cdef attributes are only accessible at the C level with type knowledge. Instead, extract the graph as a scipy CSR matrix via networkit's Python API (adjacencyMatrix), then pass the raw arrays (xadj, adjncy, adjwgt) to a new C++ copyCSRGraph method. This completely decouples the Cython bindings from networkit's internal C++ types. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
cibuildwheel downloads virtualenv.pyz from GitHub on every run, which frequently fails with HTTP 429 (Too Many Requests). Pre-download it with curl retries and cache via actions/cache so subsequent runs skip the download entirely. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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