The search for the cheapest portable clockcycles led to the ancient macbook.  It has a GT 750M with 2Gig of RAM.  It could support rep counter & camera tracker with the same openpose library, but it meant giving up on Linux.  CUDA is another thing Virtualbox doesn't support & forget about running Linux natively on a macbook since 2013.

Development for Macos was always voodoo magic for someone who grew up with only commercial operating systems & no internet.  It's now no different than Linux, ios, & android.  The mane differences are the package manager on mac is brew, the compiler is clang instead of gcc, libraries end in .dylib instead of .so.  The compiler takes a goofy -framework command which is a wrapper for multiple libraries.  Then of course, there's the dreaded xcode-select command.

The notes for mac:

Mac notes:

Openpose officially doesn't support CUDA on MAC, but hope springs eternal.

https://maelfabien.github.io/myblog//dl/open-pose/
https://github.com/CMU-Perceptual-Computing-Lab/openpose/blob/master/doc/installation.md#operating-systems

All the dependencies are system wide except caffe.

The mac drivers are a rats nest of dependencies:

Download CUDA, CUDNN, CUDA driver, & GPU driver for the current Macos
version.  The drivers are not accessible from nvidia.com.


https://www.nvidia.com/object/mac-driver-archive.html
http://www.macvidcards.com/drivers.html

Obsolete caffe instructions:

http://caffe.berkeleyvision.org/installation.html#compilation

"brew tap homebrew/science" fails but isn't necessary.

Some necessary packages:
brew install wget
brew install pkg-config
brew install cmake


To compile, clone caffe from microsoft/github.

edit caffe/Makefile.config
    uncomment USE_CUDNN
    comment out CPU_ONLY
    comment out the required lines on the CUDA_ARCH line
    comment out the Q ?= @ line


ERRORS:

Can't compile "using xyz = std::xyz" or no nullptr?

In the Makefile, add -std=c++11 to CXXFLAGS +=  and to NVCCFLAGS without
an -Xcompiler flag.  It must go directly to nvcc.  Nvcc is some kind of
shitty wrapper for the host compiler that takes some options but
requires other options to be wrapped in -Xcompiler flags.

nvcc doesn't work with every clang++ version.   The version of clang++
required by nvcc is given on 

https://docs.nvidia.com/cuda/cuda-installation-guide-mac-os-x/index.html

It requires installing an obsolete XCode & running 

sudo xcode-select -s /Applications/Obsolete XCode

to select it.


cannot link directly with ...vecLib...:

in Makefile, comment out

LDFLAGS += -framework vecLib

Undefined symbol: cv::imread

in Makefile, add LDFLAGS += `pkg-config --libs opencv`


BUILDING IT:

make builds it
make distribute installs it in the distribute directory, but also attempts
to build python modules.  make -i distribute ignores the python modules.

Then install it in this directory:

cp -a bin/* /Volumes/192.168.56.101/root/countreps.mac/bin/
cp -a include/* /Volumes/192.168.56.101/root/countreps.mac/include/
cp -a lib/* /Volumes/192.168.56.101/root/countreps.mac/lib/
cp -a proto/* /Volumes/192.168.56.101/root/countreps.mac/proto/
cp -a python/* /Volumes/192.168.56.101/root/countreps.mac/python/

The openpose compilation:

mkdir build
cd build
cmake \
-DGPU_MODE=CUDA \
-DUSE_MKL=n \
-DCaffe_INCLUDE_DIRS=/Volumes/192.168.56.101/root/countreps.mac/include \
-DCaffe_LIBS=/Volumes/192.168.56.101/root/countreps.mac/lib/libcaffe.so \
-DBUILD_CAFFE=OFF \
-DCMAKE_INSTALL_PREFIX=/Volumes/192.168.56.101/root/countreps.mac/ \
..


make
make install

Errors:
Unknown CMake command "op_detect_darwin_version".

comment out the Cuda.cmake line
  op_detect_darwin_version(OSX_VERSION)


To build countreps:

make

To run it, specify the library path:

LD_LIBRARY_PATH=lib/ ./countreps


ERROR:

Can't parse message of type "caffe.NetParameter" because it is missing
required fields: layer[0].clip_param.min, layer[0].clip_param.max

The latest Caffe is officially broken.  
Use revision f019d0dfe86f49d1140961f8c7dec22130c83154 of caffe.

Bits of openpose & caffe that were changed for mac:

https://cdn.hackaday.io/files/1629446971396096/openpose.mac.tar.xz

Important files from the simplest demo for mac:

https://cdn.hackaday.io/files/1629446971396096/countreps.mac.tar.xz

After several days, it finally ran & yielded 2 frames per second.

Still 4x faster than CPU mode on the Ryzen, maybe enough to track a subject, but not enough to count reps.

The lion kingdom still wants something that costs too much.