* change compile call to return Handle

* make CPU require compile() before call()

* fix unit tests to call compile() before call()

* fix failing ops

* update unit test

* revert some changes

* more fixups

* more diff cleanup

* a few more issues addressed

* more fixes

* update API

* more updates

* fix test_ops.py

* fix

* another attempt to fix

* fix unit test

* fix test error

* add some helper function

* update with new helper function

* update reduce to nd with new helper function

* update float sum to stable sum

* fix bug

* update all reduce to stable sum for float

* fix bug and pass the sum stable test

* remove debug info

* style

* update with shape

* fix bug

* add host parameters to cuda_emitter

* clang format

* fix bugs

* add element::type support

* format

* add a cached value with datatype name

* add init_reduce_value

* unroll loop

* optimization

* remove the need for init_value

* add memset kernel

* add memcpy

* working version

* remove debug info

* add comments, clean up code.

* change in_idx to input_idx

* fix bug

* change args name for memset in emitter

* pass element::Type instead of string

* the op::reduce come with init value, add support

* resolve codacy-bot comment

* fix bug

* resove codacy-bot comment

* remove unused comments, resolve comments

* cuda reduce for max, min, mul, reduce op init value, format

* use type::info

* use type info for numeric_limits

* remove code from gpu_host_parameters

* header

* remvoe outdated comments

* add helper to check if stable sum is needed

* add stable sum test for double

* remove extra line

* consolidate helper functions

* no need list now.

* remove extra ;

* clang format

* style

* add skip test for cpu and intelGPU side

* add line between groups of headers

* add two simple stable sum test for float and double

* skip test for intelGPU

* Add argmReduce support for int32 +  tests

* add new line

* add to intelGPU manifest

* Address Fenglei's comment

* address comments

* Small change to emitter logic.

* Chris's comments incorporated

* minor edits + clang

* edit

* add cuda reduce for product and max and added tests

* a quick fix for empty reduce axis and 0 axis

* adding min cuda reduce

* add for min

* fix bug and format

* add another min test

* adding sum to the mix and adding tests to intelGPU manifest

* Incorporate Chris's first comment + clang

* Some mods to the last commit

* Addressed Bob's comments + added more tests int8

* Added more int8 tests + added tests to IntelGPU manifest

* CI test failure debug attempt

* clang

* edit

* Adding the CPU failing test to manifest

* pulled changes from master to address travis ci build failure

* Move ParameterVector and ResultVector to the ngraph namespace where they belong

* update python wrapper

* more python fixes

* style

* Update setup.py

* fix some new code

* remove exit call

* disable some failing unit tests

* Add cudnn sum and test that exposes failure

* Add test to interpreter manifest and move test to sum file

* change test name

* Fails INTELGPU and no need to run on CPU

* Comment incorporation + kahan summation for interpreter

* small oversight correction

* resolve conflict

* minor variable name edit

* comparisons

* move more unit test out of backend_test.in.cpp

* move more tests

* move more tests