Update backend.py 
Update backend.py 

Adding missing import files in the commented examples. When trying out that particular example in commented section the TensorFlow and bumpy imports are missing
adit-chandra/tensorflow,kevin-coder/tensorflow-fork,tensorflow/tensorflow-pywrap_tf_optimizer,freedomtan/tensorflow,theflofly/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,ageron/tensorflow,apark263/tensorflow,brchiu/tensorflow,chemelnucfin/tensorflow,dongjoon-hyun/tensorflow,arborh/tensorflow,ageron/tensorflow,frreiss/tensorflow-fred,aam-at/tensorflow,hfp/tensorflow-xsmm,freedomtan/tensorflow,davidzchen/tensorflow,aldian/tensorflow,DavidNorman/tensorflow,renyi533/tensorflow,karllessard/tensorflow,sarvex/tensorflow,alsrgv/tensorflow,ageron/tensorflow,apark263/tensorflow,DavidNorman/tensorflow,aldian/tensorflow,frreiss/tensorflow-fred,jendap/tensorflow,chemelnucfin/tensorflow,ghchinoy/tensorflow,jhseu/tensorflow,cxxgtxy/tensorflow,gunan/tensorflow,paolodedios/tensorflow,brchiu/tensorflow,snnn/tensorflow,adit-chandra/tensorflow,tensorflow/tensorflow,jhseu/tensorflow,annarev/tensorflow,kevin-coder/tensorflow-fork,arborh/tensorflow,tensorflow/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,yongtang/tensorflow,sarvex/tensorflow,karllessard/tensorflow,jhseu/tensorflow,adit-chandra/tensorflow,davidzchen/tensorflow,DavidNorman/tensorflow,freedomtan/tensorflow,renyi533/tensorflow,snnn/tensorflow,alsrgv/tensorflow,hfp/tensorflow-xsmm,ghchinoy/tensorflow,hehongliang/tensorflow,gautam1858/tensorflow,ghchinoy/tensorflow,aldian/tensorflow,Intel-tensorflow/tensorflow,brchiu/tensorflow,ageron/tensorflow,arborh/tensorflow,jbedorf/tensorflow,apark263/tensorflow,jhseu/tensorflow,petewarden/tensorflow,alsrgv/tensorflow,DavidNorman/tensorflow,brchiu/tensorflow,yongtang/tensorflow,chemelnucfin/tensorflow,girving/tensorflow,ppwwyyxx/tensorflow,snnn/tensorflow,tensorflow/tensorflow-pywrap_saved_model,chemelnucfin/tensorflow,kevin-coder/tensorflow-fork,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_saved_model,chemelnucfin/tensorflow,davidzchen/tensorflow,hfp/tensorflow-xsmm,freedomtan/tensorflow,seanli9jan/tensorflow,Intel-tensorflow/tensorflow,jbedorf/tensorflow,tensorflow/tensorflow,xzturn/tensorflow,brchiu/tensorflow,brchiu/tensorflow,Intel-tensorflow/tensorflow,hfp/tensorflow-xsmm,ppwwyyxx/tensorflow,yongtang/tensorflow,tensorflow/tensorflow,sarvex/tensorflow,kevin-coder/tensorflow-fork,jbedorf/tensorflow,jendap/tensorflow,tensorflow/tensorflow,aam-at/tensorflow,apark263/tensorflow,ghchinoy/tensorflow,jhseu/tensorflow,gautam1858/tensorflow,dancingdan/tensorflow,alsrgv/tensorflow,ghchinoy/tensorflow,ghchinoy/tensorflow,tensorflow/tensorflow-pywrap_saved_model,arborh/tensorflow,arborh/tensorflow,gautam1858/tensorflow,chemelnucfin/tensorflow,brchiu/tensorflow,petewarden/tensorflow,xzturn/tensorflow,asimshankar/tensorflow,arborh/tensorflow,freedomtan/tensorflow,dancingdan/tensorflow,alshedivat/tensorflow,hfp/tensorflow-xsmm,girving/tensorflow,dancingdan/tensorflow,gunan/tensorflow,Bismarrck/tensorflow,dancingdan/tensorflow,brchiu/tensorflow,arborh/tensorflow,jbedorf/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-pywrap_tf_optimizer,adit-chandra/tensorflow,alsrgv/tensorflow,hehongliang/tensorflow,jendap/tensorflow,alshedivat/tensorflow,DavidNorman/tensorflow,xzturn/tensorflow,paolodedios/tensorflow,seanli9jan/tensorflow,petewarden/tensorflow,aam-at/tensorflow,annarev/tensorflow,gautam1858/tensorflow,kevin-coder/tensorflow-fork,apark263/tensorflow,cxxgtxy/tensorflow,Intel-Corporation/tensorflow,theflofly/tensorflow,Intel-tensorflow/tensorflow,karllessard/tensorflow,dancingdan/tensorflow,frreiss/tensorflow-fred,dongjoon-hyun/tensorflow,asimshankar/tensorflow,jhseu/tensorflow,ghchinoy/tensorflow,alshedivat/tensorflow,asimshankar/tensorflow,frreiss/tensorflow-fred,dancingdan/tensorflow,cxxgtxy/tensorflow,dancingdan/tensorflow,gunan/tensorflow,aldian/tensorflow,theflofly/tensorflow,Bismarrck/tensorflow,petewarden/tensorflow,asimshankar/tensorflow,petewarden/tensorflow,theflofly/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,dongjoon-hyun/tensorflow,girving/tensorflow,ppwwyyxx/tensorflow,jhseu/tensorflow,aam-at/tensorflow,alshedivat/tensorflow,theflofly/tensorflow,Bismarrck/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow-pywrap_saved_model,frreiss/tensorflow-fred,ageron/tensorflow,theflofly/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,xzturn/tensorflow,gunan/tensorflow,dancingdan/tensorflow,girving/tensorflow,aam-at/tensorflow,chemelnucfin/tensorflow,snnn/tensorflow,brchiu/tensorflow,xzturn/tensorflow,petewarden/tensorflow,alsrgv/tensorflow,gautam1858/tensorflow,apark263/tensorflow,hehongliang/tensorflow,tensorflow/tensorflow,DavidNorman/tensorflow,sarvex/tensorflow,renyi533/tensorflow,annarev/tensorflow,davidzchen/tensorflow,freedomtan/tensorflow,renyi533/tensorflow,jbedorf/tensorflow,arborh/tensorflow,gunan/tensorflow,jendap/tensorflow,aam-at/tensorflow,ppwwyyxx/tensorflow,gunan/tensorflow,Intel-tensorflow/tensorflow,gunan/tensorflow,theflofly/tensorflow,alshedivat/tensorflow,dongjoon-hyun/tensorflow,seanli9jan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,xzturn/tensorflow,cxxgtxy/tensorflow,dancingdan/tensorflow,seanli9jan/tensorflow,kevin-coder/tensorflow-fork,jhseu/tensorflow,Bismarrck/tensorflow,karllessard/tensorflow,hehongliang/tensorflow,adit-chandra/tensorflow,ageron/tensorflow,DavidNorman/tensorflow,apark263/tensorflow,ppwwyyxx/tensorflow,davidzchen/tensorflow,Intel-Corporation/tensorflow,dongjoon-hyun/tensorflow,freedomtan/tensorflow,jhseu/tensorflow,xzturn/tensorflow,jhseu/tensorflow,adit-chandra/tensorflow,dongjoon-hyun/tensorflow,renyi533/tensorflow,kevin-coder/tensorflow-fork,jendap/tensorflow,annarev/tensorflow,Intel-tensorflow/tensorflow,seanli9jan/tensorflow,karllessard/tensorflow,alshedivat/tensorflow,asimshankar/tensorflow,aam-at/tensorflow,paolodedios/tensorflow,annarev/tensorflow,seanli9jan/tensorflow,girving/tensorflow,girving/tensorflow,ageron/tensorflow,hfp/tensorflow-xsmm,frreiss/tensorflow-fred,jbedorf/tensorflow,cxxgtxy/tensorflow,chemelnucfin/tensorflow,yongtang/tensorflow,DavidNorman/tensorflow,xzturn/tensorflow,aam-at/tensorflow,chemelnucfin/tensorflow,kevin-coder/tensorflow-fork,paolodedios/tensorflow,DavidNorman/tensorflow,frreiss/tensorflow-fred,gautam1858/tensorflow,dongjoon-hyun/tensorflow,seanli9jan/tensorflow,ageron/tensorflow,hfp/tensorflow-xsmm,hehongliang/tensorflow,snnn/tensorflow,dongjoon-hyun/tensorflow,theflofly/tensorflow,frreiss/tensorflow-fred,annarev/tensorflow,renyi533/tensorflow,Intel-Corporation/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow-pywrap_saved_model,davidzchen/tensorflow,sarvex/tensorflow,gautam1858/tensorflow,theflofly/tensorflow,paolodedios/tensorflow,karllessard/tensorflow,asimshankar/tensorflow,annarev/tensorflow,asimshankar/tensorflow,aam-at/tensorflow,hehongliang/tensorflow,snnn/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,hfp/tensorflow-xsmm,jbedorf/tensorflow,DavidNorman/tensorflow,Bismarrck/tensorflow,tensorflow/tensorflow,gautam1858/tensorflow,karllessard/tensorflow,xzturn/tensorflow,alsrgv/tensorflow,ghchinoy/tensorflow,ppwwyyxx/tensorflow,Bismarrck/tensorflow,apark263/tensorflow,yongtang/tensorflow,gunan/tensorflow,dongjoon-hyun/tensorflow,aldian/tensorflow,jbedorf/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,jendap/tensorflow,adit-chandra/tensorflow,adit-chandra/tensorflow,gunan/tensorflow,Intel-tensorflow/tensorflow,jendap/tensorflow,ageron/tensorflow,ppwwyyxx/tensorflow,freedomtan/tensorflow,Bismarrck/tensorflow,karllessard/tensorflow,alshedivat/tensorflow,jbedorf/tensorflow,seanli9jan/tensorflow,chemelnucfin/tensorflow,renyi533/tensorflow,apark263/tensorflow,aldian/tensorflow,jendap/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_saved_model,alsrgv/tensorflow,ppwwyyxx/tensorflow,girving/tensorflow,ghchinoy/tensorflow,snnn/tensorflow,kevin-coder/tensorflow-fork,freedomtan/tensorflow,dancingdan/tensorflow,frreiss/tensorflow-fred,davidzchen/tensorflow,hehongliang/tensorflow,karllessard/tensorflow,arborh/tensorflow,Bismarrck/tensorflow,alsrgv/tensorflow,Intel-tensorflow/tensorflow,DavidNorman/tensorflow,ppwwyyxx/tensorflow,annarev/tensorflow,yongtang/tensorflow,jbedorf/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,adit-chandra/tensorflow,ghchinoy/tensorflow,hfp/tensorflow-xsmm,yongtang/tensorflow,ghchinoy/tensorflow,alshedivat/tensorflow,DavidNorman/tensorflow,gunan/tensorflow,tensorflow/tensorflow-pywrap_saved_model,gunan/tensorflow,Intel-tensorflow/tensorflow,Intel-tensorflow/tensorflow,alsrgv/tensorflow,paolodedios/tensorflow,jhseu/tensorflow,Bismarrck/tensorflow,paolodedios/tensorflow,freedomtan/tensorflow,adit-chandra/tensorflow,gautam1858/tensorflow,hfp/tensorflow-xsmm,ageron/tensorflow,aam-at/tensorflow,sarvex/tensorflow,snnn/tensorflow,davidzchen/tensorflow,aldian/tensorflow,ppwwyyxx/tensorflow,girving/tensorflow,jendap/tensorflow,frreiss/tensorflow-fred,yongtang/tensorflow,xzturn/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,hfp/tensorflow-xsmm,yongtang/tensorflow,tensorflow/tensorflow-pywrap_saved_model,freedomtan/tensorflow,brchiu/tensorflow,Intel-Corporation/tensorflow,adit-chandra/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-experimental_link_static_libraries_once,arborh/tensorflow,gautam1858/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,snnn/tensorflow,tensorflow/tensorflow-pywrap_saved_model,jbedorf/tensorflow,renyi533/tensorflow,Bismarrck/tensorflow,jendap/tensorflow,ppwwyyxx/tensorflow,girving/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,aam-at/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,brchiu/tensorflow,sarvex/tensorflow,alshedivat/tensorflow,chemelnucfin/tensorflow,yongtang/tensorflow,jendap/tensorflow,Intel-Corporation/tensorflow,alshedivat/tensorflow,snnn/tensorflow,chemelnucfin/tensorflow,xzturn/tensorflow,aam-at/tensorflow,apark263/tensorflow,girving/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,asimshankar/tensorflow,Intel-tensorflow/tensorflow,ghchinoy/tensorflow,theflofly/tensorflow,dongjoon-hyun/tensorflow,kevin-coder/tensorflow-fork,tensorflow/tensorflow-pywrap_tf_optimizer,karllessard/tensorflow,paolodedios/tensorflow,renyi533/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,jbedorf/tensorflow,theflofly/tensorflow,Intel-Corporation/tensorflow,petewarden/tensorflow,alsrgv/tensorflow,annarev/tensorflow,dancingdan/tensorflow,petewarden/tensorflow,ppwwyyxx/tensorflow,yongtang/tensorflow,snnn/tensorflow,asimshankar/tensorflow,Intel-Corporation/tensorflow,arborh/tensorflow,girving/tensorflow,annarev/tensorflow,karllessard/tensorflow,alsrgv/tensorflow,petewarden/tensorflow,aldian/tensorflow,asimshankar/tensorflow,arborh/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_saved_model,ageron/tensorflow,jhseu/tensorflow,petewarden/tensorflow,tensorflow/tensorflow,xzturn/tensorflow,annarev/tensorflow,sarvex/tensorflow,seanli9jan/tensorflow,seanli9jan/tensorflow,gunan/tensorflow,asimshankar/tensorflow,cxxgtxy/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow,seanli9jan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,renyi533/tensorflow,paolodedios/tensorflow,adit-chandra/tensorflow,renyi533/tensorflow,kevin-coder/tensorflow-fork,tensorflow/tensorflow,Intel-Corporation/tensorflow,ageron/tensorflow,frreiss/tensorflow-fred,alshedivat/tensorflow,frreiss/tensorflow-fred,davidzchen/tensorflow,theflofly/tensorflow,tensorflow/tensorflow-pywrap_saved_model,renyi533/tensorflow,dongjoon-hyun/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,apark263/tensorflow,Bismarrck/tensorflow,freedomtan/tensorflow,davidzchen/tensorflow