[Docs] Convert Sphinx docs to Fern

.github/CODEOWNERS

@@ -20,6 +20,7 @@ examples/rust/     @rapidsai/cuvs-rust-codeowners
 
 #docs code owners
 docs/              @rapidsai/cuvs-docs-codeowners
+fern/              @rapidsai/cuvs-docs-codeowners
 
 #cmake code owners
 CMakeLists.txt                  @rapidsai/cuvs-cmake-codeowners

.github/workflows/check-c-abi.yaml

@@ -128,5 +128,5 @@ jobs:
                    - The changes are documented in the changelog
                    - Migration guide is provided for users
 
-                For more information, see the [C ABI documentation](../docs/source/c_developer_guide.md).`
+                For more information, see the [C API documentation](../fern/pages/c_api/index.md).`
             });

.github/workflows/pr.yaml

@@ -134,6 +134,7 @@ jobs:
           - '!ci/test_wheel_cuvs.sh'
           - '!ci/validate_wheel.sh'
           - '!docs/**'
+          - '!fern/**'
           - '!go/**'
           - '!img/**'
           - '!java/**'
@@ -170,6 +171,7 @@ jobs:
           - '!ci/validate_wheel.sh'
           - '!Dockerfile'
           - '!docs/**'
+          - '!fern/**'
           - '!img/**'
           - '!notebooks/**'
           - '!python/**'
@@ -209,6 +211,7 @@ jobs:
           - '!Dockerfile'
           - '!README.md'
           - '!docs/**'
+          - '!fern/**'
           - '!go/**'
           - '!img/**'
           - '!java/**'
@@ -253,6 +256,7 @@ jobs:
           - '!cpp/.clang-tidy'
           - '!cpp/doxygen/**'
           - '!docs/**'
+          - '!fern/**'
           - '!java/**'
           - '!go/**'
           - '!img/**'
@@ -292,6 +296,7 @@ jobs:
           - '!ci/test_wheel_cuvs.sh'
           - '!ci/validate_wheel.sh'
           - '!docs/**'
+          - '!fern/**'
           - '!go/**'
           - '!img/**'
           - '!java/**'
@@ -332,6 +337,7 @@ jobs:
           - '!ci/test_wheel_cuvs.sh'
           - '!ci/validate_wheel.sh'
           - '!docs/**'
+          - '!fern/**'
           - '!img/**'
           - '!java/**'
           - '!notebooks/**'

build.sh

@@ -67,8 +67,7 @@ HELP="$0 [<target> ...] [<flag> ...] [--cmake-args=\"<args>\"] [--cache-tool=<to
  default action (no args) is to build libcuvs, tests and cuvs targets
 "
 LIBCUVS_BUILD_DIR=${LIBCUVS_BUILD_DIR:=${REPODIR}/cpp/build}
-SPHINX_BUILD_DIR=${REPODIR}/docs
-DOXYGEN_BUILD_DIR=${REPODIR}/cpp/doxygen
+FERN_DOCS_DIR=${REPODIR}/fern
 PYTHON_BUILD_DIR=${REPODIR}/python/cuvs/_skbuild
 RUST_BUILD_DIR=${REPODIR}/rust/target
 JAVA_BUILD_DIR=${REPODIR}/java/cuvs-java/target
@@ -99,7 +98,9 @@ EXTRA_CMAKE_ARGS=""
 
 # Set defaults for vars that may not have been defined externally
 INSTALL_PREFIX=${INSTALL_PREFIX:=${PREFIX:=${CONDA_PREFIX:=$LIBCUVS_BUILD_DIR/install}}}
-PARALLEL_LEVEL=${PARALLEL_LEVEL:=$(nproc)}
+if [[ -z "${PARALLEL_LEVEL:-}" ]]; then
+    PARALLEL_LEVEL=$(getconf _NPROCESSORS_ONLN 2>/dev/null || nproc)
+fi
 BUILD_ABI=${BUILD_ABI:=ON}
 
 # Default to Ninja if generator is not specified
@@ -371,7 +372,7 @@ fi
 
 ################################################################################
 # Configure for building all C++ targets
-if (( NUMARGS == 0 )) || hasArg libcuvs || hasArg docs || hasArg tests || hasArg bench-prims || hasArg bench-ann || hasArg examples; then
+if (( NUMARGS == 0 )) || hasArg libcuvs || hasArg tests || hasArg bench-prims || hasArg bench-ann || hasArg examples; then
     COMPILE_LIBRARY=ON
     if [[ "${BUILD_SHARED_LIBS}" != "OFF" ]]; then
         CMAKE_TARGET+=("cuvs")
@@ -535,13 +536,8 @@ export RAPIDS_VERSION_MAJOR_MINOR
 
 if hasArg docs; then
     set -x
-    cd "${DOXYGEN_BUILD_DIR}"
-    doxygen Doxyfile
-    cd "${SPHINX_BUILD_DIR}"
-    make html
-    cd "${REPODIR}"/rust
-    cargo doc -p cuvs --no-deps
-    rsync -av "${RUST_BUILD_DIR}"/doc/ "${SPHINX_BUILD_DIR}"/build/html/_static/rust
+    cd "${REPODIR}"
+    "${FERN_DOCS_DIR}/build_docs.sh" "${FERN_DOCS_MODE:-check}"
 fi
 
 ################################################################################

ci/build_docs.sh

@@ -4,25 +4,16 @@
 
 set -euo pipefail
 
-rapids-logger "Downloading artifacts from previous jobs"
-CPP_CHANNEL=$(rapids-download-conda-from-github cpp)
-PYTHON_CHANNEL=$(rapids-download-from-github "$(rapids-package-name "conda_python" cuvs --stable --cuda "$RAPIDS_CUDA_VERSION")")
-
-rapids-logger "Create test conda environment"
+rapids-logger "Create docs conda environment"
 . /opt/conda/etc/profile.d/conda.sh
 
 rapids-logger "Configuring conda strict channel priority"
 conda config --set channel_priority strict
 
-RAPIDS_VERSION_MAJOR_MINOR="$(rapids-version-major-minor)"
-export RAPIDS_VERSION_MAJOR_MINOR
-
 rapids-dependency-file-generator \
   --output conda \
   --file-key docs \
   --matrix "cuda=${RAPIDS_CUDA_VERSION%.*};arch=$(arch);py=${RAPIDS_PY_VERSION}" \
-  --prepend-channel "${CPP_CHANNEL}" \
-  --prepend-channel "${PYTHON_CHANNEL}" \
   | tee env.yaml
 
 rapids-mamba-retry env create --yes -f env.yaml -n docs
@@ -35,27 +26,5 @@ set -eu
 
 rapids-print-env
 
-RAPIDS_DOCS_DIR="$(mktemp -d)"
-export RAPIDS_DOCS_DIR
-
-rapids-logger "Build CPP docs"
-pushd cpp/doxygen
-doxygen Doxyfile
-popd
-
-rapids-logger "Build Rust docs"
-pushd rust
-LIBCLANG_PATH=$(dirname "$(find "$CONDA_PREFIX" -name libclang.so | head -n 1)")
-export LIBCLANG_PATH
-cargo doc -p cuvs --no-deps
-popd
-
-rapids-logger "Build Python docs"
-pushd docs
-make dirhtml
-mv ../rust/target/doc ./build/dirhtml/_static/rust
-mkdir -p "${RAPIDS_DOCS_DIR}/cuvs/"html
-mv build/dirhtml/* "${RAPIDS_DOCS_DIR}/cuvs/html"
-popd
-
-RAPIDS_VERSION_NUMBER="${RAPIDS_VERSION_MAJOR_MINOR}" rapids-upload-docs
+rapids-logger "Validate Fern docs"
+fern/build_docs.sh "${FERN_DOCS_MODE:-check}"

ci/release/update-version.sh

@@ -139,14 +139,14 @@ if [[ "${RUN_CONTEXT}" == "main" ]]; then
   :
 elif [[ "${RUN_CONTEXT}" == "release" ]]; then
   # In release context, use release branch for documentation links (word boundaries to avoid partial matches)
-  sed_runner "/rapidsai\\/cuvs/ s|\\bmain\\b|release/${NEXT_SHORT_TAG}|g" docs/source/developer_guide.md
+  sed_runner "/rapidsai\\/cuvs/ s|\\bmain\\b|release/${NEXT_SHORT_TAG}|g" fern/pages/developer_guide.md
   sed_runner "s|\\bmain\\b|release/${NEXT_SHORT_TAG}|g" README.md
   # Only update the GitHub URL, not the main() function
   sed_runner "s|/cuvs/blob/\\bmain\\b/|/cuvs/blob/release/${NEXT_SHORT_TAG}/|g" python/cuvs_bench/cuvs_bench/plot/__main__.py
 fi
 
 # Update cuvs-bench Docker image references (version-only, not branch-related)
-sed_runner "s|rapidsai/cuvs-bench:[0-9][0-9].[0-9][0-9]|rapidsai/cuvs-bench:${NEXT_SHORT_TAG}|g" docs/source/cuvs_bench/index.rst
+sed_runner "s|rapidsai/cuvs-bench:[0-9][0-9].[0-9][0-9]|rapidsai/cuvs-bench:${NEXT_SHORT_TAG}|g" fern/pages/cuvs_bench/index.md
 
 # Version references (not branch-related)
 sed_runner "s|=[0-9][0-9].[0-9][0-9]|=${NEXT_SHORT_TAG}|g" README.md

conda/environments/all_cuda-129_arch-aarch64.yaml

@@ -6,7 +6,6 @@ channels:
 - conda-forge
 dependencies:
 - _go_select *=cgo
-- breathe>=4.35.0
 - c-compiler
 - clang-tools==20.1.8
 - clang==20.1.8
@@ -21,11 +20,8 @@ dependencies:
 - cxx-compiler
 - cython>=3.2.2
 - dlpack>=0.8,<1.0
-- doxygen>=1.8.20
 - gcc_linux-aarch64=14.*
 - go
-- graphviz
-- ipython
 - libclang==20.1.8
 - libcublas-dev
 - libcurand-dev
@@ -37,22 +33,16 @@ dependencies:
 - make
 - nccl>=2.19
 - ninja
+- nodejs
 - numpy>=1.23,<3.0
-- numpydoc
 - openblas
 - pre-commit
 - pylibraft==26.6.*,>=0.0.0a0
 - pytest
 - pytest-cov
 - rapids-build-backend>=0.4.0,<0.5.0
-- recommonmark
 - rust
 - scikit-build-core>=0.11.0
 - scikit-learn>=1.5
-- sphinx-copybutton
-- sphinx-markdown-tables
-- sphinx>=8.0.0
 - sysroot_linux-aarch64==2.28
-- pip:
-  - nvidia-sphinx-theme
 name: all_cuda-129_arch-aarch64

conda/environments/all_cuda-129_arch-x86_64.yaml

@@ -6,7 +6,6 @@ channels:
 - conda-forge
 dependencies:
 - _go_select *=cgo
-- breathe>=4.35.0
 - c-compiler
 - clang-tools==20.1.8
 - clang==20.1.8
@@ -21,11 +20,8 @@ dependencies:
 - cxx-compiler
 - cython>=3.2.2
 - dlpack>=0.8,<1.0
-- doxygen>=1.8.20
 - gcc_linux-64=14.*
 - go
-- graphviz
-- ipython
 - libclang==20.1.8
 - libcublas-dev
 - libcurand-dev
@@ -36,22 +32,16 @@ dependencies:
 - make
 - nccl>=2.19
 - ninja
+- nodejs
 - numpy>=1.23,<3.0
-- numpydoc
 - openblas
 - pre-commit
 - pylibraft==26.6.*,>=0.0.0a0
 - pytest
 - pytest-cov
 - rapids-build-backend>=0.4.0,<0.5.0
-- recommonmark
 - rust
 - scikit-build-core>=0.11.0
 - scikit-learn>=1.5
-- sphinx-copybutton
-- sphinx-markdown-tables
-- sphinx>=8.0.0
 - sysroot_linux-64==2.28
-- pip:
-  - nvidia-sphinx-theme
 name: all_cuda-129_arch-x86_64

conda/environments/all_cuda-131_arch-aarch64.yaml

@@ -6,7 +6,6 @@ channels:
 - conda-forge
 dependencies:
 - _go_select *=cgo
-- breathe>=4.35.0
 - c-compiler
 - clang-tools==20.1.8
 - clang==20.1.8
@@ -21,11 +20,8 @@ dependencies:
 - cxx-compiler
 - cython>=3.2.2
 - dlpack>=0.8,<1.0
-- doxygen>=1.8.20
 - gcc_linux-aarch64=14.*
 - go
-- graphviz
-- ipython
 - libclang==20.1.8
 - libcublas-dev
 - libcurand-dev
@@ -37,22 +33,16 @@ dependencies:
 - make
 - nccl>=2.19
 - ninja
+- nodejs
 - numpy>=1.23,<3.0
-- numpydoc
 - openblas
 - pre-commit
 - pylibraft==26.6.*,>=0.0.0a0
 - pytest
 - pytest-cov
 - rapids-build-backend>=0.4.0,<0.5.0
-- recommonmark
 - rust
 - scikit-build-core>=0.11.0
 - scikit-learn>=1.5
-- sphinx-copybutton
-- sphinx-markdown-tables
-- sphinx>=8.0.0
 - sysroot_linux-aarch64==2.28
-- pip:
-  - nvidia-sphinx-theme
 name: all_cuda-131_arch-aarch64

conda/environments/all_cuda-131_arch-x86_64.yaml

@@ -6,7 +6,6 @@ channels:
 - conda-forge
 dependencies:
 - _go_select *=cgo
-- breathe>=4.35.0
 - c-compiler
 - clang-tools==20.1.8
 - clang==20.1.8
@@ -21,11 +20,8 @@ dependencies:
 - cxx-compiler
 - cython>=3.2.2
 - dlpack>=0.8,<1.0
-- doxygen>=1.8.20
 - gcc_linux-64=14.*
 - go
-- graphviz
-- ipython
 - libclang==20.1.8
 - libcublas-dev
 - libcurand-dev
@@ -36,22 +32,16 @@ dependencies:
 - make
 - nccl>=2.19
 - ninja
+- nodejs
 - numpy>=1.23,<3.0
-- numpydoc
 - openblas
 - pre-commit
 - pylibraft==26.6.*,>=0.0.0a0
 - pytest
 - pytest-cov
 - rapids-build-backend>=0.4.0,<0.5.0
-- recommonmark
 - rust
 - scikit-build-core>=0.11.0
 - scikit-learn>=1.5
-- sphinx-copybutton
-- sphinx-markdown-tables
-- sphinx>=8.0.0
 - sysroot_linux-64==2.28
-- pip:
-  - nvidia-sphinx-theme
 name: all_cuda-131_arch-x86_64