Update ReleaseNotes for 0.26 (#3596)

* latest PlaidML-GPU updates for 0.26

* Update Release Notes page for 0.26

doc/sphinx/ngraph_theme/ngversions.html

@@ -9,7 +9,9 @@
         <dt>{{ _('Recent Versions') }}</dt>
         <dd><!-- Until our https://docs.ngraph.ai/ publishing is set up, we link to GitHub -->  
           <ul>
-           <!-- <li><a href="https://github.com/NervanaSystems/ngraph/releases/tag/v0.26.0">0.26.0</a></li> -->
+           <!-- <li><a href="https://github.com/NervanaSystems/ngraph/releases/tag/v0.26">0.26</a></li> -->
+           <li><a href="https://github.com/NervanaSystems/ngraph/releases/tag/v0.26.0">0.26.0</a></li>
+           <li><a href="https://github.com/NervanaSystems/ngraph/releases/tag/v0.26.0">0.25.1</a></li>
            <li><a href="https://github.com/NervanaSystems/ngraph/releases/tag/v0.25.0">0.25.0</a></li>
            <li><a href="https://github.com/NervanaSystems/ngraph/releases/tag/v0.24.0">0.24.0</a></li>
            <li><a href="https://github.com/NervanaSystems/ngraph/releases/tag/v0.23.0">0.23.0</a></li>

doc/sphinx/source/conf.py

@@ -73,11 +73,11 @@ author = 'Intel Corporation'
 # built documents.
 #
 # The short X.Y version.
-version = '0.25'
+version = '0.26'
 
 # The Documentation full version, including alpha/beta/rc tags. Some features
 # available in the latest code will not necessarily be documented first
-release = '0.25.1'
+release = '0.26.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

doc/sphinx/source/project/release-notes.rst

@@ -18,11 +18,16 @@ We are pleased to announce the release of version |version|.
 
 Core updates for |version|
 --------------------------
++ All ops support ``Output<Node>`` arguments
++ Additional ops
 
-+ Allow DLLs that link nGraph statically to load backends
-+ Add rank id to trace file name.
-+ Allow provenance merging to be disabled
 
+Latest documentation updates for |version|
+------------------------------------------
+
++ Note the only support for nGPU is now through PlaidML; nGraph support for nGPU 
+  (via cuDNN) has been deprecated.  
++ iGPU works only with nGraph version `0.24`.
 
 .. important:: Pre-releases (``-rc-0.*``) have newer features, and are less stable.  
 
@@ -30,6 +35,13 @@ Core updates for |version|
 Changelog on Previous Releases
 ==============================
 
+0.25.1
+------
+
++ Allow DLLs that link nGraph statically to load backends
++ Add rank id to trace file name
++ Allow provenance merging to be disabled
+
 
 0.25.0
 ------