DOC Mention intel conda channel in installation doc (scikit-learn#14247)

Author: ogrisel

doc/install.rst

@@ -230,6 +230,26 @@ library for Windows, Mac OSX and Linux.
 Anaconda offers scikit-learn as part of its free distribution.
 
 
+Intel conda channel
+-------------------
+
+Intel maintains a dedicated conda channel that ships scikit-learn::
+
+    $ conda install -c intel scikit-learn
+
+This version of scikit-learn comes with alternative solvers for some common
+estimators. Those solvers come from the DAAL C++ library and are optimized for
+multi-core Intel CPUs.
+
+Note that those solvers are not enabled by default, please refer to the
+`daal4py <https://intelpython.github.io/daal4py/sklearn.html>`_ documentation
+for more details.
+
+Compatibility with the standard scikit-learn solvers is checked by running the
+full scikit-learn test suite via automated continuous integration as reported
+on https://github.com/IntelPython/daal4py.
+
+
 WinPython for Windows
 -----------------------