* Written header file for the nGraph reference implementation of the operation ExperimentalDetectronGenerateProposalsSingleImage.
* Small fixes.
* Started to write cpp-file for the nGraph reference implementation of the operation ExperimentalDetectronGenerateProposalsSingleImage.
* Written the postprocessing function for the nGraph reference implementation of the operation ExperimentalDetectronGenerateProposalsSingleImage.
* Code style fixes.
* Started to write calculations of the nGraph reference implementation of the operation ExperimentalDetectronGenerateProposalsSingleImage.
* Written the helper function refine_anchors().
* Written the helper function unpack_boxes().
* Small fix.
* Code style fixes.
* Written calculations of the nGraph reference implementation of the operation ExperimentalDetectronGenerateProposalsSingleImage.
* Code style fixes.
* Fixed type of one argument of fill_output_blobs().
* Code style fix.
* Written evaluate() for the operation ExperimentalDetectronGenerateProposalsSingleImage (in evaluates_map.cpp).
* Deleted redundant 'using' for typedef.
* Continued to write tests for ExperimentalDetectronGenerateProposalsSingleImage evaluation in the nGraph reference implementation.
* Fixed the reference implementation of the operation ExperimentalDetectronGenerateProposalsSingleImage.
* Deleted commented code. Code style fixes.
* Code style fix.
* Deleted debug prints in the test for an evaluation of the nGraph operation ExperimentalDetectronGenerateProposalsSingleImage.
* Enabled ONNX Importer test for the operation ExperimentalDetectronGenerateProposalsSingleImage.
* Enabled some test.
* Small fix.
* Now postprocessing of the nGraph reference realization of the operation ExperimentalDetectronGenerateProposalsSingleImage throws exception when input data type is not supported.
* Code style fix.
* Written yet another test for the nGraph reference implementation of the operation ExperimentalDetectronGenerateProposalsSingleImage.
* Reused ProposalBox type from the reference implementation of the operation Proposal.
* Added check for the attribute post_nms_count in the operation ExperimentalDetectronGenerateProposalsSingleImage evaluation.
* Small fixes.