* make axes dynamic

* add ut

* update softmax deserializer

* check axes to be constant

* remove duplicates

* Implemented downgrade pass

* Using Pad:v1 in onnx_importer

* Downgrade transformation doc fixed

* Added downgrade pass for reduce_prod

* Using ReduceProd:v1 in onnx_importer

* Added ReduceProd:1 downgrade support

* Clang styles applied

* Downgrade pass added for all backends

* Added downgrade pass for reduce_prod

* Using ReduceProd:v1 in onnx_importer

* Added ReduceProd:1 downgrade support

* Clang styles applied

* Apply suggestions from code review

Changed pad_opset_pass to opset_downgrade
Co-Authored-By: Tomasz Socha <tomasz.socha@intel.com>

* Fix names

* Apply suggestions from code review

Removed redundant include, renamed tests
Co-Authored-By: Tomasz Socha <tomasz.socha@intel.com>

* Changed order of passes

* Changed way of op casting

* Changed order of passes

* Changed downgrade pass order of CPU backend

* Changed downgrade pass order of CPU backend

* styles applied

* [SPEC] Fixed NormalizeL2 (#3695)

* Fixed NormalizeL2

* style applied

* Fixed axes rank checking

* removed redundant comma

* Set keep_dims by function argument

* Improved error message

* Fixed casting method

* fix styles

* styles applied

* Fixed normalize tests

* unit tests names refactor
Co-Authored-By: Michał Karzyński <postrational@users.noreply.github.com>

* Disable not supported PlaidML tests

* Added missing EOF

Bump MLIR version

* Change order of gemm operation

* Add Dot lit test

* style-apply

* Fix captures to avoid escapes on []

* Release notes 0.26.0-rc.3 and revise bridges overview

* Fix version module and add latest release notes; update some doc menus

* Let release notes be discoverable

* Documentation master index

* Documentation index pg

* Update ops for version

* Update illustration

* Remove old illustration

* Add note for 0-rc.4

* Add section on NGRAPH_PROFILE_PASS to backend API

* rc-0.5

* Final preview 0.26 release notes

* Note changes on Sum validation

* Fix link syntax that breaks on Sphinx 3.0

* Revert file that triggers unnecessary review

* Typo fix

* PR feedback

* Consistency on section title capitalizations

* Update link

* Section title consistency

* Implemented downgrade pass

* Using Pad:v1 in onnx_importer

* Downgrade transformation doc fixed

* Downgrade pass added for all backends

* Apply suggestions from code review

Changed pad_opset_pass to opset_downgrade
Co-Authored-By: Tomasz Socha <tomasz.socha@intel.com>

* Changed order of passes

* Changed downgrade pass order of CPU backend

* Added reverse:v1 downgrade

* Code review remakrs introduced

* Fixed problem with foward declaration

* Modify convert op to convert from bf16 to float and vice-versa

* Add a check

* Remove conversion routines and use the convert op for casting

* disable unit tests for plaidml

* add get_default_pipeline_depth to executable

* use get_preferred_pipeline_depth

* Cyphers/lastwarns (#3640)

* Build changes for -Wall

* Use properties

* Remove no-zero-as-null-pointer-constant

* add ##__VAR_ARGS__ workaround

* enable gnu-zero-variadic-macro-arguments warning

* fix gnu-zero-variadic-macro-arguments

* use PrintToDummyParamName

* remove ##__VA_ARGS__ workaround

* fix ##__VA_ARGS__ and enable gnu-zero-variadic-macro-arguments

* handle windows build

* use alternative fix to support VS compiler

* fix merge issue

* remove variadic macros from kernel_selectors

* replace remaining ##__VA_ARGS__

* fix missing braces

* Remove some clang warnings

* Warnings cleanup

* Switch op dynamic casts that crept back in

* PR for debugging purposes (#3718)

* back out

* transpose

* next try

* Another is_type

* Another is_type

* next is_type

* Revert, is_type remainder

* verify

* v1 and Dyn mixup

* Work around clang++-3.9 bug

* Implemented downgrade pass

* Using Pad:v1 in onnx_importer

* Downgrade transformation doc fixed

* Downgrade pass added for all backends

* Apply suggestions from code review

Changed pad_opset_pass to opset_downgrade
Co-Authored-By: Tomasz Socha <tomasz.socha@intel.com>

* Changed order of passes

* Changed downgrade pass order of CPU backend

* Code review remarks introduced

* add check for dynamic dimensions

* to_shape() -> rank()

* Delete unnecessary check

* Added in DeduceDynSlice suite to check dynamic dimension

* minor codestyle fix

* c-cast -> static_cast

Remove Intel GPU backend

* Added power constant folding

* Style apply

* Removed python operator pow

* Hotfix for negative axes in unsqueeze op (#3705)

* Hotfix for negative axes in unsqueeze op

* Review fix I

* Enable Gather with negative indices. (#3701)

* Enable Gather with negative indices.

* Address PR feedback.

* Remove GOE from Gather unit tests.

* merge error

* Disable test for MLIR

* More expressive error messages

* style

Enable in place rotation for Reshape for blocked data format.

* Added ReduceMean, ReduceMin, ReduceMax; Updated ReduceProd, ReduceSum

* Removed redundant method from arithmetic_reductions_keep_dims.cpp

* Fixed code style issues

* Removed generate_adjoints

* Fixed cpu_emitter

* [ONNX] Remove broadcasting from ONNX importer.

* [ONNX] Used Xor op instead of And,OR and NOT ops.

An optional optimization level was added to ExecutionEngine, initialized
to None by default. This caused fast-isel to be used in LLVM CG,
overriding all the flags related to not using fast-isel.

In this PR we pass the right optimization level to ExecutionEngine.