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Can't find GpuMAT() functions in v4.2.0-dev compiled with python & CUDA

I have "successfully" compiled OpenCV v4.2.0-dev with python bindings and CUDA support on my Windows 10 machine following the many directions available online. I say successfully because compilation didn't throw errors. However, when I try to run a cv2.cuda command, I get an error such as:

>>>q=cv2.cuda.resize(base,dsize=(100,100))

---------------------------------------------------------------------------
error                                     Traceback (most recent call last) <ipython-input-10-f4bd798fbe4a> in <module>
----> 1 q=cv2.cuda.resize(base,dsize=(100,100))

error: OpenCV(4.2.0-dev) C:\Users\M43259\Documents\python\opencv\modules\core\src\matrix_wrap.cpp:359: error: (-213:The function/feature is not implemented) getGpuMat is available only for cuda::GpuMat and cuda::HostMem in function 'cv::_InputArray::getGpuMat'

It turns out there is no python call available that has anything with GpuMAT in it. For example:

>>>cv2.cuda_GpuMAT()

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last) <ipython-input-11-c14055330a2d> in <module>
----> 1 cv2.cuda_GpuMAT()

AttributeError: module 'cv2' has no attribute 'cuda_GpuMAT'

I'm stumped. I can provide loads of files and details if anyone wants.

Can't find GpuMAT() functions in v4.2.0-dev compiled with python & CUDA

>>>q=cv2.cuda.resize(base,dsize=(100,100))

---------------------------------------------------------------------------
error                                     Traceback (most recent call last) <ipython-input-10-f4bd798fbe4a> in <module>
----> 1 q=cv2.cuda.resize(base,dsize=(100,100))

error: OpenCV(4.2.0-dev) C:\Users\M43259\Documents\python\opencv\modules\core\src\matrix_wrap.cpp:359: error: (-213:The function/feature is not implemented) getGpuMat is available only for cuda::GpuMat and cuda::HostMem in function 'cv::_InputArray::getGpuMat'

It turns out there is no python call available that has anything with GpuMAT in it. For example:

>>>cv2.cuda_GpuMAT()

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last) <ipython-input-11-c14055330a2d> in <module>
----> 1 cv2.cuda_GpuMAT()

AttributeError: module 'cv2' has no attribute 'cuda_GpuMAT'

I'm stumped. I can provide loads of files and details if anyone wants.

EDIT 1 -------

While I'm looking for relevant cmake outputs, here is the output from cv2.getBuildInformation()

General configuration for OpenCV 4.2.0-dev =====================================
  Version control:               4.2.0-1-g89d3f95a8e

  Extra modules:
    Location (extra):            C:/Users/M43259/Documents/python/opencv_contrib/modules
    Version control (extra):     4.2.0

  Platform:
    Timestamp:                   2019-12-26T17:26:27Z
    Host:                        Windows 10.0.16299 AMD64
    CMake:                       3.16.2
    CMake generator:             Visual Studio 15 2017
    CMake build tool:            C:/Program Files (x86)/Microsoft Visual Studio/2017/Professional/MSBuild/15.0/Bin/MSBuild.exe
    MSVC:                        1914

  CPU/HW features:
    Baseline:                    SSE SSE2 SSE3
      requested:                 SSE3
    Dispatched code generation:  SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
      requested:                 SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
      SSE4_1 (16 files):         + SSSE3 SSE4_1
      SSE4_2 (2 files):          + SSSE3 SSE4_1 POPCNT SSE4_2
      FP16 (1 files):            + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
      AVX (5 files):             + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
      AVX2 (29 files):           + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
      AVX512_SKX (6 files):      + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_COMMON AVX512_SKX

  C/C++:
    Built as dynamic libs?:      YES
    C++ Compiler:                C:/Program Files (x86)/Microsoft Visual Studio/2017/Professional/VC/Tools/MSVC/14.14.26428/bin/Hostx86/x64/cl.exe  (ver 19.14.26430.0)
    C++ flags (Release):         /DWIN32 /D_WINDOWS /W4 /GR  /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi  /fp:precise     /EHa /wd4127 /wd4251 /wd4324 /wd4275 /wd4512 /wd4589 /MP8   /MD /O2 /Ob2 /DNDEBUG 
    C++ flags (Debug):           /DWIN32 /D_WINDOWS /W4 /GR  /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi  /fp:precise     /EHa /wd4127 /wd4251 /wd4324 /wd4275 /wd4512 /wd4589 /MP8   /MDd /Zi /Ob0 /Od /RTC1 
    C Compiler:                  C:/Program Files (x86)/Microsoft Visual Studio/2017/Professional/VC/Tools/MSVC/14.14.26428/bin/Hostx86/x64/cl.exe
    C flags (Release):           /DWIN32 /D_WINDOWS /W3  /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi  /fp:precise       /MP8    /MD /O2 /Ob2 /DNDEBUG 
    C flags (Debug):             /DWIN32 /D_WINDOWS /W3  /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi  /fp:precise       /MP8  /MDd /Zi /Ob0 /Od /RTC1 
    Linker flags (Release):      /machine:x64  /INCREMENTAL:NO 
    Linker flags (Debug):        /machine:x64  /debug /INCREMENTAL 
    ccache:                      NO
    Precompiled headers:         NO
    Extra dependencies:          opengl32 glu32 cudart_static.lib nppc.lib nppial.lib nppicc.lib nppicom.lib nppidei.lib nppif.lib nppig.lib nppim.lib nppist.lib nppisu.lib nppitc.lib npps.lib cublas.lib cudnn.lib cufft.lib -LIBPATH:C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v10.1/lib/x64
    3rdparty dependencies:

  OpenCV modules:
    To be built:                 aruco bgsegm bioinspired calib3d ccalib core cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev datasets dnn dnn_objdetect dnn_superres dpm face features2d flann fuzzy gapi hdf hfs highgui img_hash imgcodecs imgproc line_descriptor ml objdetect optflow phase_unwrapping photo plot python3 quality reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking ts video videoio videostab world xfeatures2d ximgproc xobjdetect xphoto
    Disabled:                    -
    Disabled by dependency:      -
    Unavailable:                 cnn_3dobj cvv freetype java js matlab ovis python2 python2 sfm viz
    Applications:                tests apps
    Documentation:               NO
    Non-free algorithms:         NO

  Windows RT support:            NO

  GUI: 
    Win32 UI:                    YES
    OpenGL support:              YES (opengl32 glu32)
    VTK support:                 NO

  Media I/O: 
    ZLib:                        build (ver 1.2.11)
    JPEG:                        build-libjpeg-turbo (ver 2.0.2-62)
    WEBP:                        build (ver encoder: 0x020e)
    PNG:                         build (ver 1.6.37)
    TIFF:                        build (ver 42 - 4.0.10)
    JPEG 2000:                   build (ver 1.900.1)
    OpenEXR:                     build (ver 2.3.0)
    HDR:                         YES
    SUNRASTER:                   YES
    PXM:                         YES
    PFM:                         YES

  Video I/O:
    DC1394:                      NO
    FFMPEG:                      YES (prebuilt binaries)
      avcodec:                   YES (58.54.100)
      avformat:                  YES (58.29.100)
      avutil:                    YES (56.31.100)
      swscale:                   YES (5.5.100)
      avresample:                YES (4.0.0)
    GStreamer:                   NO
    DirectShow:                  YES
    Media Foundation:            YES
      DXVA:                      YES

  Parallel framework:            Concurrency

  Trace:                         YES (with Intel ITT)

  Other third-party libraries:
    Intel IPP:                   2019.0.0 Gold [2019.0.0]
           at:                   C:/Users/M43259/Documents/python/opencv/build/3rdparty/ippicv/ippicv_win/icv
    Intel IPP IW:                sources (2019.0.0)
              at:                C:/Users/M43259/Documents/python/opencv/build/3rdparty/ippicv/ippicv_win/iw
    Lapack:                      NO
    Eigen:                       NO
    Custom HAL:                  NO
    Protobuf:                    build (3.5.1)

  NVIDIA CUDA:                   YES (ver 10.1, CUFFT CUBLAS)
    NVIDIA GPU arch:             30 35 37 50 52 60 61 70 75
    NVIDIA PTX archs:

  cuDNN:                         YES (ver 7.6.5)

  OpenCL:                        YES (NVD3D11)
    Include path:                C:/Users/M43259/Documents/python/opencv/3rdparty/include/opencl/1.2
    Link libraries:              Dynamic load

  Python 3:
    Interpreter:                 C:/Users/M43259/AppData/Local/Continuum/anaconda3/python.exe (ver 3.7.3)
    Libraries:                   C:/Users/M43259/AppData/Local/Continuum/anaconda3/libs/python37.lib (ver 3.7.3)
    numpy:                       C:/Users/M43259/AppData/Local/Continuum/anaconda3/lib/site-packages/numpy/core/include (ver 1.16.2)
    install path:                C:/Users/M43259/AppData/Local/Continuum/anaconda3/Lib/site-packages/cv2/python-3.7

  Python (for build):            C:/Users/M43259/AppData/Local/Continuum/anaconda3/python.exe

  Java:                          
    ant:                         NO
    JNI:                         NO
    Java wrappers:               NO
    Java tests:                  NO

  Install to:                    C:/Users/M43259/Documents/python/opencv/build/install
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