Update tf.keras.backend.cast_to_floatx example
Update tf.keras.backend.cast_to_floatx example

Redoing this PR against master instead of 2.0.
annarev/tensorflow,adit-chandra/tensorflow,chemelnucfin/tensorflow,freedomtan/tensorflow,Intel-tensorflow/tensorflow,xzturn/tensorflow,tensorflow/tensorflow-pywrap_saved_model,sarvex/tensorflow,renyi533/tensorflow,davidzchen/tensorflow,davidzchen/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,ppwwyyxx/tensorflow,freedomtan/tensorflow,freedomtan/tensorflow,adit-chandra/tensorflow,aldian/tensorflow,xzturn/tensorflow,Intel-tensorflow/tensorflow,DavidNorman/tensorflow,aam-at/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,adit-chandra/tensorflow,adit-chandra/tensorflow,gautam1858/tensorflow,jhseu/tensorflow,gunan/tensorflow,petewarden/tensorflow,aam-at/tensorflow,Intel-tensorflow/tensorflow,chemelnucfin/tensorflow,DavidNorman/tensorflow,gautam1858/tensorflow,jhseu/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow,annarev/tensorflow,gunan/tensorflow,petewarden/tensorflow,DavidNorman/tensorflow,jhseu/tensorflow,davidzchen/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,cxxgtxy/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,annarev/tensorflow,sarvex/tensorflow,davidzchen/tensorflow,karllessard/tensorflow,ppwwyyxx/tensorflow,renyi533/tensorflow,paolodedios/tensorflow,alsrgv/tensorflow,gunan/tensorflow,xzturn/tensorflow,DavidNorman/tensorflow,davidzchen/tensorflow,petewarden/tensorflow,paolodedios/tensorflow,annarev/tensorflow,jhseu/tensorflow,karllessard/tensorflow,alsrgv/tensorflow,chemelnucfin/tensorflow,gunan/tensorflow,gautam1858/tensorflow,aam-at/tensorflow,xzturn/tensorflow,Intel-Corporation/tensorflow,frreiss/tensorflow-fred,sarvex/tensorflow,renyi533/tensorflow,paolodedios/tensorflow,cxxgtxy/tensorflow,chemelnucfin/tensorflow,frreiss/tensorflow-fred,chemelnucfin/tensorflow,arborh/tensorflow,chemelnucfin/tensorflow,Intel-Corporation/tensorflow,yongtang/tensorflow,davidzchen/tensorflow,ppwwyyxx/tensorflow,arborh/tensorflow,petewarden/tensorflow,freedomtan/tensorflow,frreiss/tensorflow-fred,adit-chandra/tensorflow,arborh/tensorflow,frreiss/tensorflow-fred,frreiss/tensorflow-fred,gunan/tensorflow,yongtang/tensorflow,frreiss/tensorflow-fred,gautam1858/tensorflow,jhseu/tensorflow,Intel-Corporation/tensorflow,ppwwyyxx/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_saved_model,aam-at/tensorflow,alsrgv/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,arborh/tensorflow,ppwwyyxx/tensorflow,xzturn/tensorflow,arborh/tensorflow,yongtang/tensorflow,freedomtan/tensorflow,ppwwyyxx/tensorflow,chemelnucfin/tensorflow,chemelnucfin/tensorflow,aldian/tensorflow,adit-chandra/tensorflow,aldian/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow,gunan/tensorflow,annarev/tensorflow,alsrgv/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,aam-at/tensorflow,adit-chandra/tensorflow,Intel-Corporation/tensorflow,aldian/tensorflow,davidzchen/tensorflow,yongtang/tensorflow,annarev/tensorflow,gautam1858/tensorflow,annarev/tensorflow,DavidNorman/tensorflow,aldian/tensorflow,ppwwyyxx/tensorflow,adit-chandra/tensorflow,petewarden/tensorflow,xzturn/tensorflow,tensorflow/tensorflow,Intel-Corporation/tensorflow,frreiss/tensorflow-fred,petewarden/tensorflow,davidzchen/tensorflow,gunan/tensorflow,arborh/tensorflow,gautam1858/tensorflow,annarev/tensorflow,cxxgtxy/tensorflow,renyi533/tensorflow,yongtang/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,annarev/tensorflow,tensorflow/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,Intel-tensorflow/tensorflow,renyi533/tensorflow,sarvex/tensorflow,jhseu/tensorflow,renyi533/tensorflow,paolodedios/tensorflow,karllessard/tensorflow,xzturn/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,gunan/tensorflow,tensorflow/tensorflow-pywrap_saved_model,alsrgv/tensorflow,ppwwyyxx/tensorflow,xzturn/tensorflow,tensorflow/tensorflow,aam-at/tensorflow,DavidNorman/tensorflow,frreiss/tensorflow-fred,chemelnucfin/tensorflow,alsrgv/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,adit-chandra/tensorflow,Intel-tensorflow/tensorflow,DavidNorman/tensorflow,tensorflow/tensorflow-pywrap_saved_model,karllessard/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,jhseu/tensorflow,cxxgtxy/tensorflow,sarvex/tensorflow,cxxgtxy/tensorflow,DavidNorman/tensorflow,jhseu/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,yongtang/tensorflow,sarvex/tensorflow,ppwwyyxx/tensorflow,xzturn/tensorflow,gautam1858/tensorflow,petewarden/tensorflow,freedomtan/tensorflow,DavidNorman/tensorflow,aldian/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,freedomtan/tensorflow,ppwwyyxx/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,aam-at/tensorflow,frreiss/tensorflow-fred,chemel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