Cache last zero tensor in eager gradient computation
Cache last zero tensor in eager gradient computation

SPINN and probably other models commonly split large tensors into many
equal parts (e.g. along the batch dimension). When we compute the
gradient of such split, we often don't have gradients comming from all
parts and end up creating zero tensors. This change caches the last
created zero tensor and reuses it. It reduces SPINN training time by
over 13%.

PiperOrigin-RevId: 171625608

eadgarchen/tensorflow,ageron/tensorflow,manipopopo/tensorflow,freedomtan/tensorflow,ppwwyyxx/tensorflow,nolanliou/tensorflow,mdrumond/tensorflow,rabipanda/tensorflow,alsrgv/tensorflow,chemelnucfin/tensorflow,xzturn/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,seanli9jan/tensorflow,drpngx/tensorflow,gunan/tensorflow,xodus7/tensorflow,Intel-tensorflow/tensorflow,snnn/tensorflow,xzturn/tensorflow,lakshayg/tensorflow,hfp/tensorflow-xsmm,drpngx/tensorflow,dyoung418/tensorflow,jwlawson/tensorflow,yongtang/tensorflow,Intel-tensorflow/tensorflow,benoitsteiner/tensorflow-opencl,apark263/tensorflow,ArtsiomCh/tensorflow,arborh/tensorflow,asimshankar/tensorflow,AnishShah/tensorflow,nolanliou/tensorflow,dendisuhubdy/tensorflow,allenlavoie/tensorflow,chemelnucfin/tensorflow,kobejean/tensorflow,petewarden/tensorflow,aam-at/tensorflow,benoitsteiner/tensorflow-opencl,benoitsteiner/tensorflow-xsmm,brchiu/tensorflow,benoitsteiner/tensorflow-xsmm,jwlawson/tensorflow,kevin-coder/tensorflow-fork,aldian/tensorflow,av8ramit/tensorflow,horance-liu/tensorflow,gojira/tensorflow,ZhangXinNan/tensorflow,dyoung418/tensorflow,seanli9jan/tensorflow,apark263/tensorflow,av8ramit/tensorflow,ravindrapanda/tensorflow,chemelnucfin/tensorflow,gautam1858/tensorflow,renyi533/tensorflow,renyi533/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow-pywrap_saved_model,zasdfgbnm/tensorflow,horance-liu/tensorflow,meteorcloudy/tensorflow,hfp/tensorflow-xsmm,jhseu/tensorflow,snnn/tensorflow,theflofly/tensorflow,Bismarrck/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,kobejean/tensorflow,Mistobaan/tensorflow,renyi533/tensorflow,chemelnucfin/tensorflow,ZhangXinNan/tensorflow,lakshayg/tensorflow,alshedivat/tensorflow,brchiu/tensorflow,hfp/tensorflow-xsmm,chemelnucfin/tensorflow,ghchinoy/tensorflow,jhseu/tensorflow,aldian/tensorflow,DavidNorman/tensorflow,xodus7/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,eaplatanios/tensorflow,jhseu/tensorflow,laszlocsomor/tensorflow,karllessard/tensorflow,gautam1858/tensorflow,allenlavoie/tensorflow,manipopopo/tensorflow,Mistobaan/tensorflow,kevin-coder/tensorflow-fork,kevin-coder/tensorflow-fork,yanchen036/tensorflow,Kongsea/tensorflow,AnishShah/tensorflow,girving/tensorflow,av8ramit/tensorflow,manipopopo/tensorflow,codrut3/tensorflow,jendap/tensorflow,lukeiwanski/tensorflow,nburn42/tensorflow,petewarden/tensorflow,JingJunYin/tensorflow,brchiu/tensorflow,yongtang/tensorflow,girving/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,ychfan/tensorflow,asimshankar/tensorflow,drpngx/tensorflow,seanli9jan/tensorflow,yongtang/tensorflow,seanli9jan/tensorflow,aldian/tensorflow,yongtang/tensorflow,Intel-tensorflow/tensorflow,yanchen036/tensorflow,jalexvig/tensorflow,apark263/tensorflow,alshedivat/tensorflow,brchiu/tensorflow,laszlocsomor/tensorflow,hsaputra/tensorflow,adit-chandra/tensorflow,arborh/tensorflow,caisq/tensorflow,dyoung418/tensorflow,alsrgv/tensorflow,zasdfgbnm/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,ghchinoy/tensorflow,Intel-Corporation/tensorflow,ZhangXinNan/tensorflow,ychfan/tensorflow,av8ramit/tensorflow,adit-chandra/tensorflow,av8ramit/tensorflow,xzturn/tensorflow,karllessard/tensorflow,kobejean/tensorflow,ppwwyyxx/tensorflow,DavidNorman/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow,alsrgv/tensorflow,arborh/tensorflow,jwlawson/tensorflow,guschmue/tensorflow,lakshayg/tensorflow,jwlawson/tensorflow,codrut3/tensorflow,kevin-coder/tensorflow-fork,ppwwyyxx/tensorflow,yanchen036/tensorflow,caisq/tensorflow,benoitsteiner/tensorflow-xsmm,dongjoon-hyun/tensorflow,jalexvig/tensorflow,benoitsteiner/tensorflow-opencl,apark263/tensorflow,dongjoon-hyun/tensorflow,gojira/tensorflow,yongtang/tensorflow,snnn/tensorflow,asimshankar/tensorflow,gunan/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,hehongliang/tensorflow,tensorflow/tensorflow-pywrap_saved_model,adit-chandra/tensorflow,alshedivat/tensorflow,horance-liu/tensorflow,jart/tensorflow,jalexvig/tensorflow,apark263/tensorflow,freedomtan/tensorflow,rabipanda/tensorflow,ghchinoy/tensorflow,tensorflow/tensorflow-pywrap_saved_model,karllessard/tensorflow,Bismarrck/tensorflow,sarvex/tensorflow,xzturn/tensorflow,cxxgtxy/tensorflow,Bismarrck/tensorflow,annarev/tensorflow,guschmue/tensorflow,dongjoon-hyun/tensorflow,asimshankar/tensorflow,aam-at/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow,gojira/tensorflow,Intel-Corporation/tensorflow,dyoung418/tensorflow,brchiu/tensorflow,annarev/tensorflow,alshedivat/tensorflow,Bismarrck/tensorflow,caisq/tensorflow,tensorflow/tensorflow,alistairlow/tensorflow,JingJunYin/tensorflow,jbedorf/tensorflow,karllessard/tensorflow,AnishShah/tensorflow,adit-chandra/tensorflow,annarev/tensorflow,yongtang/tensorflow,jhseu/tensorflow,alshedivat/tensorflow,asimshankar/tensorflow,DavidNorman/tensorflow,horance-liu/tensorflow,kobejean/tensorflow,guschmue/tensorflow,heh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8ramit/tensorflow,seanli9jan/tensorflow,xzturn/tensorflow,xzturn/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow,sarvex/tensorflow,dongjoon-hyun/tensorflow,kevin-coder/tensorflow-fork,Intel-Corporation/tensorflow,ZhangXinNan/tensorflow,benoitsteiner/tensorflow-opencl,renyi533/tensorflow,renyi533/tensorflow,gojira/tensorflow,hfp/tensorflow-xsmm,drpngx/tensorflow,eaplatanios/tensorflow,adit-chandra/tensorflow,horance-liu/tensorflow,jhseu/tensorflow,horance-liu/tensorflow,ychfan/tensorflow,mdrumond/tensorflow,gunan/tensorflow,ppwwyyxx/tensorflow,alsrgv/tensorflow,theflofly/tensorflow,hsaputra/tensorflow,freedomtan/tensorflow,ghchinoy/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,sarvex/tensorflow,aldian/tensorflow,sarvex/tensorflow,kobejean/tensorflow,xodus7/tensorflow,jhseu/tensorflow,horance-liu/tensorflow,Kongsea/tensorflow,dancingdan/tensorflow,alshedivat/tensorflow,Xeralux/tensorflow,apark263/tensorflow,laszlocsomor/tensorflow,jalexvig/tensorflow,rabipanda/tensorflow,tensorflow/tensorflow-pywrap_saved_model,dongjoon-hyun/tensorflow,DavidNorman/tensorflow,petewarden/tensorflow,meteorcloudy/tensorflow,ghchinoy/tensorflow,ychfan/tensorflow,lukeiwanski/tensorflow,arborh/tensorflow,nburn42/tensorflow,dendisuhubdy/tensorflow,ppwwyyxx/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,ArtsiomCh/tensorflow,apark263/tensorflow,seanli9jan/tensorflow,yongtang/tensorflow,xodus7/tensorflow,nburn42/tensorflow,nburn42/tensorflow,jhseu/tensorflow,davidzchen/tensorflow,gunan/tensorflow,ArtsiomCh/tensorflow,theflofly/tensorflow,jbedorf/tensorflow,jendap/tensorflow,Xeralux/tensorflow,ppwwyyxx/tensorflow,gojira/tensorflow,girving/tensorflow,ravindrapanda/tensorflow,jhseu/tensorflow,AnishShah/tensorflow,gunan/tensorflow,freedomtan/tensorflow,allenlavoie/tensorflow,frreiss/tensorflow-fred,frreiss/tensorflow-fred,aselle/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,zasdfgbnm/tensorflow,jart/tensorflow,freedomtan/tensorflow,mdrumond/tensorflow,tensorflow/tensorflow,arborh/tensorflow,jendap/tensorflow,paolodedios/tensorflow,arborh/tensorflow,zasdfgbnm/tensorflow,guschmue/tensorflow,AnishShah/tensorflow,Mistobaan/tensorflow,nburn42/tensorflow,ageron/tensorflow,ZhangXinNan/tensorflow,manipopopo/tensorflow,Bismarrck/tensorflow,aam-at/tensorflow,paolodedios/tensorflow,yongtang/tensorflow,Mistobaan/tensorflow,jbedorf/tensorflow,karllessard/tensorflow,zasdfgbnm/tensorflow,xodus7/tensorflow,jendap/tensorflow,nolanliou/tensorflow,horance-liu/tensorflow,xzturn/tensorflow,freedomtan/tensorflow,davidzchen/tensorflow,DavidNorman/tensorflow,snnn/tensorflow,nburn42/tensorflow,ArtsiomCh/tensorflow,nolanliou/tensorflow,jbedorf/tensorflow,ppwwyyxx/tensorflow,xodus7/tensorflow,dongjoon-hyun/tensorflow,dancingdan/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-experimental_link_static_libraries_once,DavidNorman/tensorflow,Xeralux/tensorflow,eadgarchen/tensorflow,chemelnucfin/tensorflow,hsaputra/tensorflow,davidzchen/tensorflow,hsaputra/tensorflow,yongtang/tensorflow,benoitsteiner/tensorflow-opencl,tensorflow/tensorflow-pywrap_saved_model,dyoung418/tensorflow,annarev/tensorflow,meteorcloudy/tensorflow,dendisuhubdy/tensorflow,eaplatanios/tensorflow,AnishShah/tensorflow,dongjoon-hyun/tensorflow,ppwwyyxx/tensorflow,alsrgv/tensorflow,gunan/tensorflow,hfp/tensorflow-xsmm,alshedivat/tensorflow,lakshayg/tensorflow,seanli9jan/tensorflow,alistairlow/tensorflow,guschmue/tensorflow,lakshayg/tensorflow,alsrgv/tensorflow,jalexvig/tensorflow,DavidNorman/tensorflow,manipopopo/tensorflow,apark263/tensorflow,xzturn/tensorflow,petewarden/tensorflow,aselle/tensorflow,jalexvig/tensorflow,ageron/tensorflow,lukeiwanski/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,apark263/tensorflow,ZhangXinNan/tensorflow,Bismarrck/tensorflow,jbedorf/tensorflow,lukeiwanski/tensorflow,caisq/tensorflow,theflofly/tensorflow,gojira/tensorflow,ArtsiomCh/tensorflow,ppwwyyxx/tensorflow,frreiss/tensorflow-fred,eaplatanios/tensorflow,gautam1858/tensorflow,hsaputra/tensorflow,xodus7/tensorflow,zasdfgbnm/tensorflow,adit-chandra/tensorflow,allenlavoie/tensorflow,benoitsteiner/tensorflow-opencl,AnishShah/tensorflow,Mistobaan/tensorflow,paolodedios/tensorflow,jalexvig/tensorflow,dyoung418/tensorflow,hehongliang/tensorflow,meteorcloudy/tensorflow,ghchinoy/tensorflow,ghchinoy/tensorflow,nburn42/tensorflow,meteorcloudy/tensorflow,ageron/tensorflow,ghchinoy/tensorflow,theflofly/tensorflow,theflofly/tensorflow,benoitsteiner/tensorflow-xsmm,manipopopo/tensorflow,brchiu/tensorflow,karllessard/tensorflow,hsaputra/tensorflow,asimshankar/tensorflow,laszlocsomor/tensorflow,yongtang/tensorflow,jbedorf/tensorflow,laszlocsomor/tensorflow,benoitsteiner/tensorflow-xsmm,chemelnucfin/tensorflow,drpngx/tensorflow,girving/tensorflow,DavidNorman/tensorflow,jendap/tensorflow,jart/tensorflow,jwlawson/tensorflow,Xeralux/tensorflow,caisq/tensorflow,dendisuhubdy/tensorflow,jwlawson/tensorf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