From aad241ea76cf4fbff08fbba8424f2b380331b586 Mon Sep 17 00:00:00 2001
From: Anupam <54245698+aamijar@users.noreply.github.com>
Date: Tue, 24 Mar 2026 20:03:11 -0700
Subject: [PATCH] PCA docs (#1949)

Add PCA to the 26.04 docs.

Authors:
  - Anupam (https://github.com/aamijar)

Approvers:
  - Corey J. Nolet (https://github.com/cjnolet)

URL: https://github.com/rapidsai/cuvs/pull/1949
---
 docs/source/cpp_api/preprocessing.rst     |  1 +
 docs/source/cpp_api/preprocessing_pca.rst | 27 +++++++++++++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 docs/source/cpp_api/preprocessing_pca.rst

diff --git a/docs/source/cpp_api/preprocessing.rst b/docs/source/cpp_api/preprocessing.rst
index 5fd8cfe778..417c8faf7e 100644
--- a/docs/source/cpp_api/preprocessing.rst
+++ b/docs/source/cpp_api/preprocessing.rst
@@ -9,5 +9,6 @@ Preprocessing
    :maxdepth: 2
    :caption: Contents:
 
+   preprocessing_pca.rst
    preprocessing_quantize.rst
    preprocessing_spectral_embedding.rst
diff --git a/docs/source/cpp_api/preprocessing_pca.rst b/docs/source/cpp_api/preprocessing_pca.rst
new file mode 100644
index 0000000000..8a6b7ecfe0
--- /dev/null
+++ b/docs/source/cpp_api/preprocessing_pca.rst
@@ -0,0 +1,27 @@
+PCA
+===
+
+Principal Component Analysis (PCA) is a linear dimensionality reduction technique that projects data onto orthogonal directions of maximum variance.
+
+.. role:: py(code)
+   :language: c++
+   :class: highlight
+
+``#include <cuvs/preprocessing/pca.hpp>``
+
+namespace *cuvs::preprocessing::pca*
+
+Params
+----------
+
+.. doxygenstruct:: cuvs::preprocessing::pca::params
+    :project: cuvs
+    :members:
+
+PCA
+---------
+
+.. doxygengroup:: pca
+    :project: cuvs
+    :members:
+    :content-only: