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CNTK 2.2 requires Open Source Computer Vision (OpenCV) to be installed but it is optional for CNTK 2.3+.
You need to install OpenCV for CNTK 2.3+, if you want to use the following components:
- CNTK Image Reader
- CNTK Image Writer - required to use Tensorboard's Image feature.
Download and install version 3.1 for Windows from this download location. This installer is just an unpacker. E.g. enter "c:\local" under the "Extract to". We recommend that you rename the created OpenCV folder to reflect the version number you just installed (Opencv3.1.0).
Quick installation check: If you followed the instruction above and used the same paths, the command dir C:\local\opencv3.10\build\x64\vc14\bin\opencv_world310.dll will succeed.