Building tensorflow 1.7.1 from source on Ubuntu 18.04 to get rid of 'invalid instruction' error

build-tensorflow-from-source.sh

#How to build tensorflow 1.7.1 from source on Ubuntu 18.04
#=========================================================

# Bazel

## install bazel depencies

    sudo apt-get install pkg-config zip g++ zlib1g-dev unzip python

## download Bazel 0.9 (see compatibility chart on https://www.tensorflow.org/install/install_sources)

    wget https://github.com/bazelbuild/bazel/releases/download/0.10.0/bazel-0.10.0-installer-linux-x86_64.sh

    chmod +x bazel-0.10.0-installer-linux-x86_64.sh
    ./bazel-0.10.0-installer-linux-x86_64.sh --user

## add ~/bin to PATH

    echo 'export PATH="$PATH:$HOME/bin"' >> ~/.bashrc


# Tensorflow

## install tensorflow dependencies

    sudo apt-get install python3-numpy python3-dev python3-pip python3-wheel

## get Tensorflow source version 1.7.1 

    git clone https://github.com/tensorflow/tensorflow.git --depth=1 --branch=v1.7.1

## configure it

    cd tensorflow
    ./configure # this is an interactice script, choose /usr/bin/python3 when asking for a python program

## build it

    bazel build --config=mkl --config=opt //tensorflow/tools/pip_package:build_pip_package
    # have a rest, this takes more than 2h on DpvCam UC
    bazel-bin/tensorflow/tools/pip_package/build_pip_package /tmp/tensorflow_pkg
    sudo python3 -m pip install /tmp/tensorflow_pkg/tensorflow-1.7.1-cp36-cp36m-linux_x86_64.whl