Cyphers/s barannikov

* Update documentation for utility test functions.

* Remove unnecesary code and update comment.

* Added elu operator to Python API.

* Added missing file.

* Specified elu function description.

* Expand docstring

* [Py] Added test with scalar for elu operator.

* Bugfix

*  [Py] Changed input type in elu test.

* Update test_ops_binary.py

* [Py] Syntax bugfix.

* [Py] Added elu operator to list in documentation.

* Qualify `is_commutative` method with `const`
* Override it for `Equal`, `Minumum`, `NotEqual` ops
* Ensure that all overrides of the method are `public`

Other operations which have already been converted to new op form accept
`Output<Node>`` by const reference. `BatchNorm*` ops were an exception.

* Fix perf regression in vgg16

* Make switch generic

* Remove unused variables

* Review comments

* Remove unused function parameters

* trivial commit to restart CI

* Split backend_test.in.cpp

* style

* Move backend_{graph_comparison,mlir}.in.cpp back

* Move backend_mlir.in.cpp into backend/ dir

* Disable some tests in PlaidML manifest

* ReverseSequence operator introduced

* Code review remarks introduced

* Added missing EOF

* Removed unused whitespaces in onnx_import.in.cpp

* Added convert to i32 for sequence_lenghts

* Coode review remarks introduced

* Disable reverse sequence for plaidml backend

* Code style fixed

* Workaround to allow BEs to disable revalidation in pass manager

* No no no, your _other_ `false`.

* Update jenkins-trigger.groovy

* Update jenkins-trigger.groovy

* Update jenkins-trigger.groovy

* Update jenkins-trigger.groovy

* Update jenkins-trigger.groovy

* Print provenance_tag name for allreduce op

* Fix a bug

* remove friendly_name print out

* Fix

* More debug

* More bugs

* Bug

* More meaningful outputs

* Better output

* c_str()

* Print friendly_name or provenance_tags

* Print provenance_tags when available

* Add comments

* style

* Codegen support for Dropout

* Different implementation

* Update ngtf bridge doc for generic versioning

* Many improvements, including previous group-based edits

- New section for docs on extra-experimental project-based features
- Team-based edits from PR 2994 added
- Reorganize GSG sections to be cleaner for getting started
- Fix link style warning generated by broadcast.hpp

* Update README with correct ngraph-bridge link on tf repo

* Fix comment so warning not generated on broadcasting op

* Add latest doc changes to ReleaseNotes

* Fix wording suggestion on PR review

* Update HE Transformer experimental backend

* Better error checking for Argmin/Argmax

Argmin and Argmax are not defined if the reduction axis has length 0.

* Simplify

* Update test/type_prop/index_reduction.cpp
Co-Authored-By: Adam Procter <adam.m.procter@intel.com>

* Update test/type_prop/index_reduction.cpp
Co-Authored-By: Adam Procter <adam.m.procter@intel.com>

Add fixes to broken link found by linkchecker

* WIP

* All but two unit tests passing

* Explanatory comment

* Cleanup

* A bit of cleanup stemming from review comments

* Rewrite to use LoopNestBuilder

* Remove unnecessary check from CompiledKernel

* Removed some dead-ish code I missed

* Switch to camelCase in lowerer.cpp

* Fix assignment of resIndexHandles that was triggering an assert

* Add in some safety checks

* dyn_cast -> cast

Aliasing prevents vectorization and other optimizations in LLVM (dot2d,
for example). I found that LLVM dialect contemplates the possibility of
previous dialects adding llvm.noalias attribute to function arguments so
that the NoAlias attribute is generated in LLVM-IR. This should be good for
now although we should discuss how to model this in Standard dialect and co.