Update GraphDef version to 688.
Update GraphDef version to 688.

PiperOrigin-RevId: 359466371
Change-Id: Ie1e4108c4e0eff05f93a819154662e1c07d6b5ca

frreiss/tensorflow-fred,karllessard/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-experimental_link_static_libraries_once,sarvex/tensorflow,petewarden/tensorflow,karllessard/tensorflow,Intel-Corporation/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,karllessard/tensorflow,karllessard/tensorflow,frreiss/tensorflow-fred,Intel-Corporation/tensorflow,karllessard/tensorflow,karllessard/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow,sarvex/tensorflow,tensorflow/tensorflow,gautam1858/tensorflow,sarvex/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,Intel-tensorflow/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,gautam1858/tensorflow,paolodedios/tensorflow,yongtang/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,karllessard/tensorflow,tensorflow/tensorflow-pywrap_saved_model,frreiss/tensorflow-fred,Intel-Corporation/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,Intel-Corporation/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,annarev/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow,annarev/tensorflow,sarvex/tensorflow,petewarden/tensorflow,gautam1858/tensorflow,paolodedios/tensorflow,frreiss/tensorflow-fred,yongtang/tensorflow,Intel-Corporation/tensorflow,petewarden/tensorflow,gautam1858/tensorflow,paolodedios/tensorflow,yongtang/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,petewarden/tensorflow,frreiss/tensorflow-fred,annarev/tensorflow,Intel-tensorflow/tensorflow,annarev/tensorflow,tensorflow/tensorflow,yongtang/tensorflow,yongtang/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_saved_model,yongtang/tensorflow,tensorflow/tensorflow-pywrap_saved_model,paolodedios/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,petewarden/tensorflow,sarvex/tensorflow,petewarden/tensorflow,annarev/tensorflow,sarvex/tensorflow,frreiss/tensorflow-fred,frreiss/tensorflow-fred,yongtang/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,annarev/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,gautam1858/tensorflow,karllessard/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-pywrap_saved_model,frreiss/tensorflow-fred,Intel-Corporation/tensorflow,yongtang/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,yongtang/tensorflow,karllessard/tensorflow,gautam1858/tensorflow,karllessard/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,sarvex/tensorflow,gautam1858/tensorflow,annarev/tensorflow,Intel-Corporation/tensorflow,annarev/tensorflow,Intel-tensorflow/tensorflow,Intel-tensorflow/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,frreiss/tensorflow-fred,gautam1858/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_saved_model,Intel-tensorflow/tensorflow,tensorflow/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,karllessard/tensorflow,tensorflow/tensorflow-pywrap_saved_model,sarvex/tensorflow,tensorflow/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,annarev/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_tf_optimizer,gautam1858/tensorflow,frreiss/tensorflow-fred,paolodedios/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow,annarev/tensorflow,frreiss/tensorflow-fred,petewarden/tensorflow,paolodedios/tensorflow,yongtang/tensorflow,petewarden/tensorflow,annarev/tensorflow,tensorflow/tensorflow,yongtang/tensorflow,tensorflow/tensorflow