🚨 Breaking Changes

• Promote experimental FIL to stable (#6464) @wphicks
• Support non-trivial classes_ in LogisticRegression (#6346) @jcrist
• Use new rapids-logger library (#6289) @vyasr

🐛 Bug Fixes

• Unblock CI for 25.04 (#6519) @csadorf
• Skip test_rf_classification_seed for cudf.pandas tests. (#6500) @csadorf
• Remove dask to sparse workarounds (#6489) @TomAugspurger
• Fix accidental required sklearn import (#6483) @jcrist
• FIX Pass instances to the constructor of the meta-estimator in SVC (#6471) @betatim
• Fix compiler dependency on ARM (#6456) @bdice
• Revert "Temporarily increase max_days_without_success (#6390)" (#6455) @divyegala
• Enhance argument handling in UniversalBase to accept NoneType (#6453) @csadorf
• Fix UMAP transform (#6449) @viclafargue
• Fallback to CPU for sparse inputs for KMeans (#6448) @csadorf
• Limited support for array-like inputs (#6442) @csadorf
• Fix test_accuracy_score test on cudf.pandas build (#6439) @jcrist
• Support positional args in cuml.accel estimators (#6423) @jcrist
• Fix HDBSCAN python docs related to metric (#6422) @divyegala
• declare runtime dependency on 'packaging', update scikit-learn and hdbscan for cuml-cpu to match cuml (#6420) @jameslamb
• Fix forwarding of initial_alpha and learning_rate in UMAP (#6417) @jcrist
• Implement Ridge .solver_ estimated attribute (#6415) @csadorf
• Fix multi-target prediction in linear models (#6414) @csadorf
• Ensure output_type="pandas" returns user-facing pandas (#6407) @jcrist
• Ensure LinearSVC supports all input types (#6404) @jcrist
• Make UMAP callback pickleable (#6402) @jcrist
• Correctly align trees in experimental FIL (#6397) @wphicks
• A few log level handling cleanups (#6393) @jcrist
• Fix cupy error in KernelDensity with epanechnikov (#6388) @jcrist
• Check if both ground truth and result are NaN in MSEObjectiveTest for RF (#6387) @wphicks
• Support non-native endian inputs to LabelEncoder (#6384) @jcrist
• Fix hypothesis test in test_kernel_ridge.py (#6382) @jcrist
• Remove debug logging from nearest neighbors test (#6376) @csadorf
• Ensure FIL CPU can be run without an available GPU (#6373) @wphicks
• Correctly pass through unhashable objects during hyperparam lookup (#6369) @wphicks
• Correct translation of RandomForest criterion hyperparameter (#6363) @wphicks
• UMAP fallback improvements (#6358) @viclafargue
• A few GPU<->CPU interop fixes (#6355) @jcrist
• Fix output type of KernelRidge.predict (#6354) @jcrist
• Skip test_extract_partitions_shape test. (#6338) @csadorf
• Require sphinx<8.2.0 (#6336) @csadorf
• Fix call to NearestNeighbors.kneighbors() without args. (#6333) @csadorf
• Commenting out debug print statements in UMAP (#6332) @viclafargue
• Correct UMAP dispatch trigger condition (#6330) @viclafargue
• Fix issue caused by None arg provided by sklearn pipeline (#6326) @viclafargue
• Improvements for interoperability of Random Forest (#6320) @dantegd
• Improvements for PCA CPU interoperability (#6319) @dantegd
• Plumb metric and metric_kwds through to UMAP with nn_descent (#6304) @jcrist
• Use L2Expanded/L2SqrtExpanded instead of the *Unexpanded variants (#6303) @jcrist
• Fix UMAP issues with large inputs (#6245) @viclafargue
• Fix LogisticRegression.decision_function output shape (#6235) @jcrist
• Compute noise_variance_ in PCA implementation (#6234) @jcrist
• Multiple CPU interop fixes for serialization and cloning (#6223) @dantegd

📖 Documentation

• Clarify support in docs (#6452) @bdice
• Provide docs for cuml.accel command line feature (#6322) @wphicks

🚀 New Features

• Promote experimental FIL to stable (#6464) @wphicks
• UMAP 32bits dispatch mechanism (#6314) @viclafargue
• Add aarch64 conda environments (#6226) @jcrist
• SVM cpu/gpu interop (#6089) @viclafargue

🛠️ Improvements

• Don't use private APIs in FIL notebook (#6488) @jcrist
• Only use released versions of dask (#6485) @jcrist
• Move SVM working set log to debug (#6477) @jcrist
• C++ SG_RF_TEST OOMs in 11.4 nightly (#6474) @divyegala
• Revert "ci: pre-filter 11.4 jobs before they are enabled in shared workflows (#6447)" (#6470) @divyegala
• Support __len__ in ensemble estimators (#6468) @jcrist
• Add deprecation warning to cuml-cpu builds (#6466) @jcrist
• Fix template argument of DeviceSegmentedReduce kernels (#6459) @miscco
• Add scikit-learn acceleration tests to nightly CI tests (#6457) @csadorf
• Fix benchmark builds in devcontainers (#6450) @bdice
• ci: pre-filter 11.4 jobs before they are enabled in shared workflows (#6447) @gforsyth
• Reenable more UMAP tests on ARM (#6446) @jcrist
• Clean up after removing KMeans deprecation warning (#6445) @betatim
• Port all conda recipes to rattler-build (#6440) @gforsyth
• Remove the deprecation warning and switch to new default (#6433) @betatim
• Remove old deprecations (#6427) @jcrist
• Fix oob_score=True handling with accelerator (#6425) @betatim
• remove unused imports (#6424) @jameslamb
• Disable codecov comments (#6419) @jcrist
• Require hypothesis tests have explicit examples (#6409) @aamijar
• Improve accuracy_score compatibility with sklearn. (#6406) @jcrist
• Drop cub{Min, Max} (#6405) @miscco
• Move accel implementation fully to cuml.accel (#6401) @jcrist
• cuml-cpu: fix import issues, enable conda import tests (#6400) @jameslamb
• Drop numba_utils (#6396) @jakirkham
• Simplify cpu_to_gpu and gpu_to_cpu (#6395) @jcrist
• Adds get_level() (#6392) @Intron7
• Temporarily increase max_days_without_success (#6390) @jcrist
• Drop deprecated CCCL functors (#6389) @miscco
• Solve forward merger conflicts of #6313 (#6385) @dantegd
• CI: Run extended accel mode tests (#6377) @csadorf
• Use conda-build instead of conda-mambabuild (#6368) @bdice
• Don't log coverage output to terminal in CI (#6367) @jcrist
• Remove KernelRidge from cuml.accel (#6361) @jcrist
• Enable UVM in cuml.accel (#6359) @wphicks
• Drop deprecated CUB iterators in favor of Thrust iterators (#6356) @miscco
• Adjust accel verbosity (#6353) @csadorf
• Avoid importing umap with import cuml (#6352) @jcrist
• Make proxy module patching skip patching if patched library is not installed (#6348) @dantegd
• Add new cuml.accel module (#6347) @jcrist
• Support non-trivial classes_ in LogisticRegression (#6346) @jcrist
• Make r2_score compatible with Scikit-Learn (#6337) @jcrist
• Remove left-over code related to strict mode. (#6335) @csadorf
• Make sure specifying default value or nothing behaves the same in KMeans (#6331) @betatim
• Make KernelRidge inherit from UniversalBase (#6327) @betatim
• Reduce peak memory in UMAP.fit/UMAP.fit_transform (#6323) @jcrist
• Consolidate more Conda solves in CI (#6321) @KyleFromNVIDIA
• Require CMake 3.30.4 (#6318) @robertmaynard
• Copy attributes from the original class to the proxy (#6306) @betatim
• Use shared-workflows branch-25.04 (#6298) @bdice
• Add build_type input field for test.yaml (#6296) @gforsyth
• Do not use LEGACY_PTX_ARCH argument for BlockReduce (#6290) @miscco
• Use new rapids-logger library (#6289) @vyasr
• disallow fallback to Make in wheel builds (#6286) @jameslamb
• Forward-merge branch-25.02 to branch-25.04 (#6283) @bdice
• Migrate to NVKS for amd64 CI runners (#6280) @bdice
• Add verify-codeowners hook (#6275) @KyleFromNVIDIA
• Speed up FIL and TSNE pytests in CI (#6270) @dantegd
• Bracnh 25.04 merge branch 25.02 (#6268) @vyasr
• Add shellcheck to pre-commit and fix warnings (#6246) @gforsyth
• Prepare for n_init=auto in KMeans (#6142) @betatim