* enhance ppl for all codebases
* fix dump info
* fix md and use not None
* remove redundant codes
* safe convert empty ppl tensor
* add examples and remove useless lines
* add ppl install doc and how to test a model doc
* remove mmdet model list in ppl.md
* resolve comments
* fix typo
* add mmocr doc
* mv configs as the final column
* fix typo and align tables
* fix lint
* Fix include and lib paths for onnxruntime.
* Fixes for SSD export test
* Add onnx2openvino and OpenVINODetector. Test models: ssd, retinanet, fcos, fsaf.
* Add support for two-stage models: faster_rcnn, cascade_rcnn
* Add doc
* Add strip_doc_string for openvino.
* Fix openvino preprocess.
* Add OpenVINO to test_wrapper.py.
* Fix
* Add openvino_execute.
* Removed preprocessing.
* Fix onnxruntime cmake.
* Rewrote postprocessing and forward, added docstrings and fixes.
* Added device type change to OpenVINOWrapper.
* Update forward_of_single_roi_extractor_dynamic_openvino and fix doc.
* Update docs.
* Add OpenVINODetector and onn2openvino tests.
* Add input_info to onnx2openvino.
* Add TestOpenVINOExporter and test_single_roi_extractor.
* Moved get_input_shape_from_cfg to openvino_utils.py and added test.
* Added test_cascade_roi_head.
* Add backend.check_env() to tests.
* Add OpenVINO to get_rewrite_outputs and to some tests in test_mmdet_models.
* Moved test_single_roi_extractor to test_mmdet_models.
* Removed TestOpenVINOExporter.
