Ayzhuang/fix tf maxpool segfault migrate (#2909)
Ayzhuang/fix tf maxpool segfault migrate (#2909)

* remove throw from dtor (#2854)

* Migrate from master (#2858)

* Migrate from master. (#2866)

* Add build option NGRAPH_ENABLE_CPU_CONV_AUTO to enable/disable mkldnn convolution_auto for CPU backend. (#2868)

* Fix a bug in mkldnn emitter. (#2878)

* Fix data type for conv builder (#2885)

* Fix data type for conv builder

* Added support for other data types

* Migrate #2889 from master (#2891)

* Migrate from #2884 (#2897)

* Migrate #2864 (#2901)

* Migrate #2864

* Remove extra changes

* Copy PR #2894 to r0.19 branch (#2903)

NervanaSystems/ngraph,NervanaSystems/ngraph,NervanaSystems/ngraph,NervanaSystems/ngraph