Main merge release/25.12 (unblock forward merge) #5354
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This PR integrates cuVS spectral clustering from upstream into cuGraph while maintaining full backward compatibility. The integration deprecates the legacy balanced cut clustering C++ and Python APIs in favor of spectral_modularity_maximization. In fact, cuVS consolidated the spectral clustering API to assign vertices to clusters that by default maximizes the modularity score
**Static Linking with Conda Fallback:**
- cuGraph is configured to statically link libcuvs for optimal performance
- The build system first attempts to use conda-installed libcuvs if available
- If libcuvs is not present in the conda environment or static linking is required, the build system automatically clones the main cuVS repository (rapidsai/cuvs) and builds it from source
- Uses the standard RAPIDS release branch (${rapids-cmake-checkout-tag}) ensuring version compatibility
Note: The header files `raft/spectral/partition.cuh` and `raft/spectral/modularity_maximization.cuh` are still necessary in `spectraly_clustering.cu` because APIs (like `raft::spectral::analyzePartition`, `raft::spectral::analyzeModularity`) are still being called in cuGraph and are not supported in cuVS. This is not an issue because those APIs are not deprecated in raft in contrary to `kmeans` and `solvers`
Authors:
- Joseph Nke (https://github.com/jnke2016)
Approvers:
- Anupam (https://github.com/aamijar)
- Chuck Hastings (https://github.com/ChuckHastings)
- Rick Ratzel (https://github.com/rlratzel)
- Robert Maynard (https://github.com/robertmaynard)
- Bradley Dice (https://github.com/bdice)
URL: rapidsai#5326
…#5332) RAPIDS has deployed an autoscaling cloud build cluster that can be used to accelerate building large RAPIDS projects. This PR updates the conda and wheel builds to use the build cluster. This contributes to rapidsai/build-planning#228. Authors: - Paul Taylor (https://github.com/trxcllnt) Approvers: - Jake Awe (https://github.com/AyodeAwe) - Bradley Dice (https://github.com/bdice) URL: rapidsai#5332
…apidsai#5345) Updates pylibcugraph to support different temporal comparisons (i.e. >=, <, <=, >, last). Authors: - Alex Barghi (https://github.com/alexbarghi-nv) Approvers: - Joseph Nke (https://github.com/jnke2016) - Chuck Hastings (https://github.com/ChuckHastings) - Rick Ratzel (https://github.com/rlratzel) URL: rapidsai#5345
The distributed sampling API has been migrated to cuGraph-PyG, so we are deprecating it here. Authors: - Alex Barghi (https://github.com/alexbarghi-nv) - Chuck Hastings (https://github.com/ChuckHastings) Approvers: - Brad Rees (https://github.com/BradReesWork) URL: rapidsai#5336
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Nov 25, 2025
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Unblocks the forward merge.