doctest fix ubuntu cpu test
doctest fix ubuntu cpu test

fix expected return for doctests with grayscale_to_rgb, rgb_to_grayscale
yongtang/tensorflow,cxxgtxy/tensorflow,yongtang/tensorflow,petewarden/tensorflow,sarvex/tensorflow,gautam1858/tensorflow,renyi533/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow,frreiss/tensorflow-fred,Intel-Corporation/tensorflow,xzturn/tensorflow,Intel-tensorflow/tensorflow,yongtang/tensorflow,frreiss/tensorflow-fred,davidzchen/tensorflow,tensorflow/tensorflow-pywrap_saved_model,gunan/tensorflow,karllessard/tensorflow,gautam1858/tensorflow,karllessard/tensorflow,Intel-tensorflow/tensorflow,gunan/tensorflow,gunan/tensorflow,aldian/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,Intel-Corporation/tensorflow,petewarden/tensorflow,jhseu/tensorflow,gunan/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,renyi533/tensorflow,Intel-Corporation/tensorflow,gautam1858/tensorflow,Intel-tensorflow/tensorflow,Intel-tensorflow/tensorflow,gautam1858/tensorflow,davidzchen/tensorflow,xzturn/tensorflow,freedomtan/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,xzturn/tensorflow,frreiss/tensorflow-fred,jhseu/tensorflow,paolodedios/tensorflow,gautam1858/tensorflow,Intel-tensorflow/tensorflow,paolodedios/tensorflow,freedomtan/tensorflow,xzturn/tensorflow,tensorflow/tensorflow,gunan/tensorflow,renyi533/tensorflow,tensorflow/tensorflow,gunan/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,renyi533/tensorflow,tensorflow/tensorflow,aam-at/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-experimental_link_static_libraries_once,aldian/tensorflow,jhseu/tensorflow,freedomtan/tensorflow,xzturn/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,sarvex/tensorflow,aam-at/tensorflow,yongtang/tensorflow,sarvex/tensorflow,karllessard/tensorflow,yongtang/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-experimental_link_static_libraries_once,paolodedios/tensorflow,gunan/tensorflow,aam-at/tensorflow,annarev/tensorflow,aam-at/tensorflow,annarev/tensorflow,Intel-tensorflow/tensorflow,gunan/tensorflow,davidzchen/tensorflow,petewarden/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,xzturn/tensorflow,Intel-tensorflow/tensorflow,frreiss/tensorflow-fred,renyi533/tensorflow,tensorflow/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,aam-at/tensorflow,aldian/tensorflow,frreiss/tensorflow-fred,paolodedios/tensorflow,sarvex/tensorflow,yongtang/tensorflow,frreiss/tensorflow-fred,Intel-tensorflow/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,gunan/tensorflow,renyi533/tensorflow,petewarden/tensorflow,gautam1858/tensorflow,aldian/tensorflow,cxxgtxy/tensorflow,paolodedios/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,jhseu/tensorflow,Intel-Corporation/tensorflow,cxxgtxy/tensorflow,xzturn/tensorflow,aam-at/tensorflow,gunan/tensorflow,petewarden/tensorflow,aam-at/tensorflow,freedomtan/tensorflow,yongtang/tensorflow,yongtang/tensorflow,petewarden/tensorflow,frreiss/tensorflow-fred,davidzchen/tensorflow,tensorflow/tensorflow,renyi533/tensorflow,karllessard/tensorflow,Intel-Corporation/tensorflow,aam-at/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-pywrap_tf_optimizer,yongtang/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_tf_optimizer,davidzchen/tensorflow,paolodedios/tensorflow,jhseu/tensorflow,jhseu/tensorflow,tensorflow/tensorflow-pywrap_saved_model,gautam1858/tensorflow,freedomtan/tensorflow,yongtang/tensorflow,davidzchen/tensorflow,paolodedios/tensorflow,aldian/tensorflow,petewarden/tensorflow,renyi533/tensorflow,cxxgtxy/tensorflow,Intel-tensorflow/tensorflow,paolodedios/tensorflow,aam-at/tensorflow,xzturn/tensorflow,yongtang/tensorflow,Intel-Corporation/tensorflow,davidzchen/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow,jhseu/tensorflow,aam-at/tensorflow,paolodedios/tensorflow,sarvex/tensorflow,freedomtan/tensorflow,aldian/tensorflow,gunan/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,renyi533/tensorflow,aldian/tensorflow,aam-at/tensorflow,freedomtan/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_saved_model,annarev/tensorflow,freedomtan/tensorflow,annarev/tensorflow,frreiss/tensorflow-fred,freedomtan/tensorflow,gunan/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,Intel-Corporation/tensorflow,renyi533/tensorflow,renyi533/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,petewarden/tensorflow,jhseu/tensorflow,petewarden/tensorflow,jhseu/tensorflow,frreiss/tensorflow-fred,karllessard/tensorflow,freedomtan/tensorflow,annarev/tensorflow,cxxgtxy/tensorflow,frreiss/tensorflow-fred,xzturn/tensorflow,tensorflow/tensorflow-pywrap_saved_model,frreiss/tensorflow-fred,sarvex/tensorflow,renyi533/tensorflow,jhseu/tensorflow,Intel-tensorflow/tensorflow,annarev/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-pywrap_saved_model,gautam1858/tensorflow,aldian/tensorflow,xzturn/tensorflow,davidzchen/tensorflow,aam-at/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-experimental_link_static_libraries_once,xzturn/tensorflow,gautam1858/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,Intel-Corporation/tensorflow,jhseu/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow,annarev/tensorflow,annarev/tensorflow,xzturn/tensorflow,sarvex/tensorflow,annarev/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,freedomtan/tensorflow,freedomtan/tensorflow,gautam1858/tensorflow,annarev/tensorflow,jhseu/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,paolodedios/tensorflow,karllessard/tensorflow,gautam1858/tensorflow,annarev/tensorflow,tensorflow/tensorflow-pywrap_saved_model,petewarden/tensorflow,tensorflow/tensorflow-pywrap_saved_model,sarvex/tensorflow,karllessard/tensorflow