Expose UpdateContext which is needed by HorovodStrategy.
Expose UpdateContext which is needed by HorovodStrategy.

PiperOrigin-RevId: 208693736

chemelnucfin/tensorflow,ppwwyyxx/tensorflow,xzturn/tensorflow,Intel-Corporation/tensorflow,Bismarrck/tensorflow,snnn/tensorflow,tensorflow/tensorflow,theflofly/tensorflow,girving/tensorflow,Intel-tensorflow/tensorflow,chemelnucfin/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,snnn/tensorflow,xzturn/tensorflow,renyi533/tensorflow,hehongliang/tensorflow,brchiu/tensorflow,girving/tensorflow,adit-chandra/tensorflow,theflofly/tensorflow,jbedorf/tensorflow,adit-chandra/tensorflow,renyi533/tensorflow,freedomtan/tensorflow,jbedorf/tensorflow,ZhangXinNan/tensorflow,arborh/tensorflow,kevin-coder/tensorflow-fork,dongjoon-hyun/tensorflow,apark263/tensorflow,alshedivat/tensorflow,ageron/tensorflow,Intel-tensorflow/tensorflow,alsrgv/tensorflow,xodus7/tensorflow,theflofly/tensorflow,snnn/tensorflow,ageron/tensorflow,petewarden/tensorflow,theflofly/tensorflow,xodus7/tensorflow,chemelnucfin/tensorflow,hfp/tensorflow-xsmm,dancingdan/tensorflow,alshedivat/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,sarvex/tensorflow,freedomtan/tensorflow,alshedivat/tensorflow,kevin-coder/tensorflow-fork,aldian/tensorflow,hehongliang/tensorflow,alshedivat/tensorflow,Bismarrck/tensorflow,xzturn/tensorflow,gautam1858/tensorflow,aldian/tensorflow,ZhangXinNan/tensorflow,DavidNorman/tensorflow,brchiu/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_saved_model,brchiu/tensorflow,tensorflow/tensorflow-pywrap_saved_model,jbedorf/tensorflow,davidzchen/tensorflow,freedomtan/tensorflow,snnn/tensorflow,Intel-tensorflow/tensorflow,ZhangXinNan/tensorflow,seanli9jan/tensorflow,arborh/tensorflow,kevin-coder/tensorflow-fork,jbedorf/tensorflow,tensorflow/tensorflow,petewarden/tensorflow,frreiss/tensorflow-fred,annarev/tensorflow,DavidNorman/tensorflow,seanli9jan/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,arborh/tensorflow,adit-chandra/tensorflow,aldian/tensorflow,kevin-coder/tensorflow-fork,renyi533/tensorflow,aam-at/tensorflow,hfp/tensorflow-xsmm,asimshankar/tensorflow,brchiu/tensorflow,gunan/tensorflow,tensorflow/tensorflow-pywrap_saved_model,renyi533/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,jendap/tensorflow,arborh/tensorflow,frreiss/tensorflow-fred,gautam1858/tensorflow,jbedorf/tensorflow,alshedivat/tensorflow,jendap/tensorflow,aam-at/tensorflow,gunan/tensorflow,AnishShah/tensorflow,davidzchen/tensorflow,yongtang/tensorflow,jendap/tensorflow,ppwwyyxx/tensorflow,frreiss/tensorflow-fred,alshedivat/tensorflow,snnn/tensorflow,Bismarrck/tensorflow,freedomtan/tensorflow,ageron/tensorflow,ghchinoy/tensorflow,Intel-tensorflow/tensorflow,snnn/tensorflow,hehongliang/tensorflow,tensorflow/tensorflow,karllessard/tensorflow,gautam1858/tensorflow,ppwwyyxx/tensorflow,hfp/tensorflow-xsmm,annarev/tensorflow,apark263/tensorflow,yongtang/tensorflow,jbedorf/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,Intel-Corporation/tensorflow,chemelnucfin/tensorflow,adit-chandra/tensorflow,gautam1858/tensorflow,alsrgv/tensorflow,petewarden/tensorflow,AnishShah/tensorflow,frreiss/tensorflow-fred,DavidNorman/tensorflow,gunan/tensorflow,aam-at/tensorflow,frreiss/tensorflow-fred,yongtang/tensorflow,yongtang/tensorflow,cxxgtxy/tensorflow,kevin-coder/tensorflow-fork,freedomtan/tensorflow,ghchinoy/tensorflow,adit-chandra/tensorflow,cxxgtxy/tensorflow,alshedivat/tensorflow,cxxgtxy/tensorflow,Bismarrck/tensorflow,karllessard/tensorflow,Bismarrck/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-pywrap_saved_model,AnishShah/tensorflow,aam-at/tensorflow,alshedivat/tensorflow,jendap/tensorflow,sarvex/tensorflow,annarev/tensorflow,hfp/tensorflow-xsmm,AnishShah/tensorflow,aam-at/tensorflow,davidzchen/tensorflow,sarvex/tensorflow,jendap/tensorflow,annarev/tensorflow,renyi533/tensorflow,asimshankar/tensorflow,Intel-Corporation/tensorflow,ageron/tensorflow,tensorflow/tensorflow-pywrap_saved_model,dongjoon-hyun/tensorflow,tensorflow/tensorflow-pywrap_saved_model,seanli9jan/tensorflow,petewarden/tensorflow,seanli9jan/tensorflow,ghchinoy/tensorflow,AnishShah/tensorflow,ppwwyyxx/tensorflow,xodus7/tensorflow,alsrgv/tensorflow,jendap/tensorflow,freedomtan/tensorflow,brchiu/tensorflow,jhseu/tensorflow,kobejean/tensorflow,jbedorf/tensorflow,apark263/tensorflow,ghchinoy/tensorflow,hehongliang/tensorflow,tensorflow/tensorflow-pywrap_saved_model,paolodedios/tensorflow,paolodedios/tensorflow,davidzchen/tensorflow,dancingdan/tensorflow,arborh/tensorflow,theflofly/tensorflow,dongjoon-hyun/tensorflow,snnn/tensorflow,paolodedios/tensorflow,gunan/tensorflow,Bismarrck/tensorflow,kevin-coder/tensorflow-fork,petewarden/tensorflow,petewarden/tensorflow,paolodedios/tensorflow,alsrgv/tensorflow,seanli9jan/tensorflow,apark263/tensorflow,dancingdan/tensorflow,karllessard/tensorflow,kobejean/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,ZhangXinNan/tensorflow,theflofly/tensorflow,xzturn/tensorflow,chemelnucfin/tensorflow,aam-at/tensorflow,kevin-coder/tensorflow-fork,cxxgtxy/tensorf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