Build tensorflow and opencv

build_tensorflow_and_opencv.md

## Build OpenCV for python 3


#### For python3 on ubuntu

```bash
cmake -Wno-deprecated-gpu-targets \
	-D BUILD_TIFF=ON \
	-D BUILD_opencv_java=OFF \
	-D WITH_CUDA=ON \
	-D CUDA_FAST_MATH=1 \
	-D WITH_CUBLAS=1 \
	-D ENABLE_AVX=ON \
	-D WITH_IPP=OFF \
	-D WITH_TBB=ON \
	-D WITH_EIGEN=ON \
	-D WITH_V4L=ON \
	-D WITH_VTK=OFF \
	-D BUILD_TESTS=OFF \
	-D BUILD_PERF_TESTS=OFF \
	-D CMAKE_BUILD_TYPE=RELEASE \
	-D OPENCV_EXTRA_MODULES_PATH=~/Desktop/opencv_contrib/modules \
	-D CMAKE_INSTALL_PREFIX=$(python3 -c "import sys; print(sys.prefix)") \
	-D PYTHON_EXECUTABLE=$(which python3) \
	-D PYTHON3_INCLUDE_DIR=$(python3 -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())") \
	-D PYTHON3_PACKAGES_PATH=$(python3 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())") ..
```

#### For python on Mac
```bash
cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D WITH_CUDA=ON \
    -D ENABLE_FAST_MATH=1 \
    -D CUDA_FAST_MATH=1 \
    -D WITH_CUBLAS=1 \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-3.1.0/modules \
    -D BUILD_EXAMPLES=ON ..
```

## Build Tensorflow with GPU
```bash
bazel build -c opt --copt=-march=native --config=cuda -k //tensorflow/tools/pip_package:build_pip_package
```