Fix documents to reflect CUPY_ACCELERATORS
@@ -30,14 +30,14 @@ These functions cover a subset of
ext
-CUB backend for reduction routines
+CUB/cuTENSOR backend for reduction routines
----------------------------------
Some CuPy reduction routines, including :func:`~cupy.sum`, :func:`~cupy.min`, :func:`~cupy.max`,
:func:`~cupy.argmin`, :func:`~cupy.argmax`, and other functions built on top of them, can be
-accelerated by switching to the `CUB`_ backend. The switch can be toggled on or off at runtime
-by setting the bool :data:`cupy.cuda.cub_enabled`, which is set to ``False`` by default. Note
-that while in general CUB-backed reductions are faster, there could be exceptions depending on
-the data layout. We recommend users to perform some benchmarks to determine whether CUB offers
-better performance or not.
+accelerated by switching to the `CUB`_ or `cuTENSOR`_ backend. These backends can be enabled
+by setting ``CUPY_ACCELERATORS`` environement variable. Note that while in general the accelerated
+reductions are faster, there could be exceptions depending on the data layout. We recommend
+users to perform some benchmarks to determine whether CUB offers better performance or not.
-.. _CUB: http://nvlabs.github.io/cub/
+.. _CUB: https://nvlabs.github.io/cub/
+.. _cuTENSOR: https://docs.nvidia.com/cuda/cutensor/index.html
