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* Allow the face detector to be run concurrently.

* Use img_view instead of numpy_image
Co-authored-by: Akshay Modi <amodi@netflix.com>

* Add support for matrix serialization to python API

* add double to function names

Improve the error a user gets when trying to build the pyhton extention on windows but they didn't install visual C++.

paths instead of relying on CUDA_PATH to be set.

* imglab: add support for using chinese whispers for more automatic clustering

* widgets: refactor out zooming from wheel handling

* tools/imglab/src/metadata_editor.cpp

imglab: add keyboard shortcuts for zooming

* Add point assignment test

* Fix setting points y coordinate changes x instead (issue #1794)

* Add python api that generates desciptor(s) from the aligned image(s)

* Remove asserts from face_recognition.py example/tutorial

* In batch_compute_face_descriptors_from_aligned_images, use for-in loop to simplify the code

Improvde the document on binding methods and the error message if the aligned image is not of size 150x150

* Exposing chinese_whispers directly

* Addressing comments

* Changed description
* Added support for distance weights
* Added tests

* Improving test to check returned results

* added scale_image python binding which returns an image resized by the provided scale factor

* added scale_rect for rectangle and drectangle. returns a rectangle scaled by the provided scaling factor

* - do not cast scale_rect coordinates to long for drectangle
- document scale_rect for drectangle and rectangle in _abstract.h
- change python binding scale_image to resize_image
- update documentation for resize_image to describe behaviour

python API.