Added Eltwise Layer Support

Account for sample weights in calculating OOB Error

* account for sample weights in oob error calculation

* redefine oob error functions

* fix ABI compatibility

Fix KD Tree kNN Implementation

* Make KDTree mode in kNN functional

remove docs and revert change

Make KDTree mode in kNN functional

spacing

Make KDTree mode in kNN functional

fix window compilations warnings

Make KDTree mode in kNN functional

fix window compilations warnings

Make KDTree mode in kNN functional

casting

Make KDTree mode in kNN functional

formatting

Make KDTree mode in kNN functional

* test coding style

original commit: 71f665bd

* DNA-mode: update miniflann to handle DNA

* DNA-mode: update hierarchical kmeans to handle DNA sequences

Bit exact gaussian blur for 16bit unsigned int

* bit-exact gaussian kernel for CV_16U

* SIMD optimization

* template GaussianBlurFixedPoint

* remove template specialization

* simd support for h3N121 uint16

* test for u16 gaussian blur

* remove unnecessary comments

* fix return type of raw()

* add typedef of native internal type in fixedpoint

* update return type of raw()

Bit-exact Nearest Neighbor Resizing

* bit exact resizeNN

* change the value of method enum

* add bitexact-nn to ResizeExactTest

* test to compare with non-exact version

* add perf for bit-exact resizenn

* use cvFloor-equivalent

* 1/3 scaling is not stable for floating calculation

* stricter test

* bugfix: broken data in case of 6 or 12bytes elements

* bugfix: broken data in default pix_size

* stricter threshold

* use raw() for floor

* use double instead of int

* follow code reviews

* fewer cases in perf test

* center pixel convention

ADD yolov4 in models.yml

* Fix ONNX loading in issues opencv#17516, opencv#17531

* Add tests for Linear and Matmul layers

* Disable tests for IE versions lower than 20.4

* Skip unstable tests with OpenCL FP16 on Intel GPU

* Add correct test filtering for OpenCL FP16 tests

[GSoC] Add siamrpnpp.py

* Updated base branch with siamrpnpp.py

* Addition of Parsers

* Merged to using few ONNX files, Changes to Parsers, Links to Repo

* Deleted whitespace

* Adjusting flake8 error

* Fixes according to review

* Fix according to review

* Addition of OpenVINO backends and Computation target devices

* Fix on backend after review

* Fixes after review

* Remove extra white space

* Removed Repeated Varaibles

Add CV_LOG_DEBUG.

 - AVDISCARD_NONINTRA flag is supported only for FFMPEG libraries pack

Use camera intrinsic matrix everywhere. Add cameramatrix, distcoeffs and distcoeffsfisheye macros to avoid copy/paste errors.

* Fixed centering issue with make_cicle_pattern and make_acircle_pattern()

* Fixed issue where asymmetric circles were not at 45 degree angles. Also fixed support for inch measurement by converting parsing to usage of floating points for page size

* Fixed copy-paste error from experimental workspace