Update update_confusion_matrix_variables to alwasy cast to variables_to_update dtype (vs. explicit float32)
Update update_confusion_matrix_variables to alwasy cast to variables_to_update dtype (vs. explicit float32)

This commits updates the function update_confusion_matrix_variables
to alwasy cast to dtype based on  variables_to_update (previously
the values are casted to float32 explicitly and that cuases issues
when keras' backend use non-float32).

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>

petewarden/tensorflow,karllessard/tensorflow,karllessard/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,paolodedios/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,davidzchen/tensorflow,aldian/tensorflow,yongtang/tensorflow,yongtang/tensorflow,petewarden/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,freedomtan/tensorflow,tensorflow/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_saved_model,Intel-tensorflow/tensorflow,karllessard/tensorflow,aam-at/tensorflow,paolodedios/tensorflow,gautam1858/tensorflow,aam-at/tensorflow,davidzchen/tensorflow,yongtang/tensorflow,petewarden/tensorflow,Intel-tensorflow/tensorflow,freedomtan/tensorflow,annarev/tensorflow,davidzchen/tensorflow,yongtang/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow,Intel-tensorflow/tensorflow,Intel-Corporation/tensorflow,sarvex/tensorflow,tensorflow/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-pywrap_saved_model,paolodedios/tensorflow,annarev/tensorflow,karllessard/tensorflow,karllessard/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-pywrap_saved_model,Intel-tensorflow/tensorflow,Intel-Corporation/tensorflow,aam-at/tensorflow,gautam1858/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_tf_optimizer,petewarden/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow,aldian/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,annarev/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow-pywrap_saved_model,frreiss/tensorflow-fred,gautam1858/tensorflow,karllessard/tensorflow,freedomtan/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,aam-at/tensorflow,davidzchen/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,aam-at/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,davidzchen/tensorflow,annarev/tensorflow,frreiss/tensorflow-fred,aldian/tensorflow,frreiss/tensorflow-fred,cxxgtxy/tensorflow,sarvex/tensorflow,aldian/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,Intel-Corporation/tensorflow,tensorflow/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-experimental_link_static_libraries_once,yongtang/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,cxxgtxy/tensorflow,freedomtan/tensorflow,aldian/tensorflow,frreiss/tensorflow-fred,petewarden/tensorflow,tensorflow/tensorflow,paolodedios/tensorflow,cxxgtxy/tensorflow,gautam1858/tensorflow,yongtang/tensorflow,sarvex/tensorflow,Intel-tensorflow/tensorflow,frreiss/tensorflow-fred,gautam1858/tensorflow,annarev/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,Intel-tensorflow/tensorflow,freedomtan/tensorflow,aam-at/tensorflow,annarev/tensorflow,tensorflow/tensorflow,paolodedios/tensorflow,davidzchen/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,karllessard/tensorflow,freedomtan/tensorflow,Intel-Corporation/tensorflow,aam-at/tensorflow,tensorflow/tensorflow-pywrap_saved_model,gautam1858/tensorflow,tensorflow/tensorflow,karllessard/tensorflow,davidzchen/tensorflow,davidzchen/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,annarev/tensorflow,karllessard/tensorflow,paolodedios/tensorflow,paolodedios/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,freedomtan/tensorflow,frreiss/tensorflow-fred,Intel-tensorflow/tensorflow,aam-at/tensorflow,Intel-tensorflow/tensorflow,petewarden/tensorflow,tensorflow/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow-pywrap_saved_model,davidzchen/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,frreiss/tensorflow-fred,aam-at/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-experimental_link_static_libraries_once,aam-at/tensorflow,annarev/tensorflow,annarev/tensorflow,tensorflow/tensorflow,petewarden/tensorflow,gautam1858/tensorflow,sarvex/tensorflow,sarvex/tensorflow,frreiss/tensorflow-fred,aldian/tensorflow,cxxgtxy/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-experimental_link_static_libraries_once,Intel-tensorflow/tensorflow,aldian/tensorflow,karllessard/tensorflow,cxxgtxy/tensorflow,annarev/tensorflow,yongtang/tensorflow,petewarden/tensorflow,aldian/tensorflow,freedomtan/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-pywrap_tf_optimizer,gautam1858/tensorflow,annarev/tensorflow,freedomtan/tensorflow,sarvex/tensorflow,davidzchen/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,Intel-Corporation/tensorflow,tensorflow/tensorflow,gautam1858/tensorflow,cxxgtxy/tensorflow,davidzchen/tensorflow,petewarden/tensorflow,gautam1858/tensorfl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