refactor dockerfiles and update docs

docker/gitlab-runner/Dockerfile

-FROM xiaomimace/mace-dev:latest
+FROM registry.cn-hangzhou.aliyuncs.com/xiaomimace/mace-dev:latest
 
 # Update source
 RUN apt-get update -y

docker/Dockerfile → docker/mace-dev-lite/Dockerfile

 FROM ubuntu:16.04
 
+WORKDIR /
+
 # Update source
 RUN apt-get update -y
 
-## Basic tools
-RUN apt-get install -y --no-install-recommends apt-utils
+# Basic tools
 RUN apt-get install -y --no-install-recommends \
+    apt-utils \
     build-essential \
     cmake \
     curl \
@@ -32,11 +34,15 @@ RUN apt-get install -y --no-install-recommends \
     bsdmainutils
 RUN pip install --upgrade pip
 
-# Upgrade CMake
-RUN wget https://cmake.org/files/v3.11/cmake-3.11.3-Linux-x86_64.tar.gz -P /tmp/ && \
-    tar zxf /tmp/cmake-3.11.3-Linux-x86_64.tar.gz --strip-components=1 -C /usr/local/ && \
-    update-alternatives --install /usr/bin/cmake cmake /usr/local/bin/cmake 1 --force && \
-    rm -f /tmp/cmake-3.11.3-Linux-x86_64.tar.gz
+# Setup vim
+RUN apt-get install -y --no-install-recommends \
+    locales \
+    vim
+
+RUN locale-gen en_US.UTF-8
+ENV LC_CTYPE=en_US.UTF-8
+ENV LC_ALL=en_US.UTF-8
+ENV TERM xterm-256color
 
 # Set up Bazel.
 # Running bazel inside a `docker build` command causes trouble, cf:
@@ -49,63 +55,21 @@ RUN echo "build --spawn_strategy=standalone --genrule_strategy=standalone" \
     >>/etc/bazel.bazelrc
 # Install the most recent bazel release.
 ENV BAZEL_VERSION 0.13.1
-WORKDIR /
-RUN mkdir /bazel && \
-    cd /bazel && \
+RUN mkdir /tmp/bazel && \
+    cd /tmp/bazel && \
     wget https://github.com/bazelbuild/bazel/releases/download/$BAZEL_VERSION/bazel-$BAZEL_VERSION-installer-linux-x86_64.sh && \
     chmod +x bazel-*.sh && \
     ./bazel-$BAZEL_VERSION-installer-linux-x86_64.sh && \
     cd / && \
-    rm -f /bazel/bazel-$BAZEL_VERSION-installer-linux-x86_64.sh
+    rm -rf /tmp/bazel
 
-# Setup vim
-RUN apt-get update -y
-RUN apt-get install -y --no-install-recommends \
-    locales \
-    vim
-
-RUN mkdir -p ~/.vim/autoload ~/.vim/bundle && \
-    curl -LSso ~/.vim/autoload/pathogen.vim https://tpo.pe/pathogen.vim
-
-RUN mkdir -p ~/.vim/bundle
-RUN cd ~/.vim/bundle && \
-    git clone https://github.com/scrooloose/nerdtree.git && \
-    git clone https://github.com/vim-syntastic/syntastic.git && \
-    git clone https://github.com/vim-airline/vim-airline.git && \
-    git clone https://github.com/altercation/vim-colors-solarized.git && \
-    git clone https://github.com/bazelbuild/vim-ft-bzl.git && \
-    git clone https://github.com/google/vim-maktaba.git && \
-    git clone https://github.com/google/vim-codefmt.git
-
-RUN curl -LSso ~/.vimrc  https://gist.githubusercontent.com/llhe/71c5802919debd5825c100c0135478a7/raw/16a35020cc65f9c25d0cf8f11a3ba7b345a1271d/.vimrc
-
-RUN locale-gen en_US.UTF-8
-ENV LC_CTYPE=en_US.UTF-8
-ENV LC_ALL=en_US.UTF-8
-ENV TERM xterm-256color
-
-# Extra packges
-RUN apt-get install -y --no-install-recommends \
-    telnet \
-    net-tools \
-    inetutils-ping \
-    screen \
-    android-tools-adb \
-    htop
-
-# Download NDK in different versions
+# Download NDK
 RUN cd /opt/ && \
-    wget -q https://dl.google.com/android/repository/android-ndk-r12b-linux-x86_64.zip && \
-    unzip -q android-ndk-r12b-linux-x86_64.zip && \
-    rm -f android-ndk-r12b-linux-x86_64.zip && \
     wget -q https://dl.google.com/android/repository/android-ndk-r15c-linux-x86_64.zip && \
     unzip -q android-ndk-r15c-linux-x86_64.zip && \
-    rm -f android-ndk-r15c-linux-x86_64.zip && \
-    wget -q https://dl.google.com/android/repository/android-ndk-r16-linux-x86_64.zip && \
-    unzip -q android-ndk-r16-linux-x86_64.zip && \
-    rm -f android-ndk-r16-linux-x86_64.zip
+    rm -f android-ndk-r15c-linux-x86_64.zip
 
-ENV ANDROID_NDK_VERSION r12b
+ENV ANDROID_NDK_VERSION r15c
 ENV ANDROID_NDK /opt/android-ndk-${ANDROID_NDK_VERSION}
 ENV ANDROID_NDK_HOME ${ANDROID_NDK}
 
@@ -113,16 +77,15 @@ ENV ANDROID_NDK_HOME ${ANDROID_NDK}
 ENV PATH ${PATH}:${ANDROID_NDK_HOME}
 
 # Install tools
+RUN apt-get install -y --no-install-recommends \
+    android-tools-adb
 RUN pip install -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com setuptools
-RUN pip install -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com tensorflow==1.8.0 \
-    numpy>=1.14.0 \
+RUN pip install -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com \
+    tensorflow==1.8.0 \
+    "numpy>=1.14.0" \
     scipy \
     jinja2 \
     pyyaml \
     sh==1.12.14 \
     pycodestyle==2.4.0 \
-    filelock \
-    sphinx \
-    sphinx-autobuild \
-    sphinx_rtd_theme \
-    recommonmark
+    filelock

docker/mace-dev/Dockerfile

+FROM registry.cn-hangzhou.aliyuncs.com/xiaomimace/mace-dev-lite:latest
+
+# Install tools
+RUN apt-get install -y --no-install-recommends \
+    telnet \
+    net-tools \
+    inetutils-ping \
+    screen \
+    htop
+RUN pip install -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com \
+    sphinx \
+    sphinx-autobuild \
+    sphinx_rtd_theme \
+    recommonmark
+
+# Customize vim
+RUN mkdir -p ~/.vim/autoload ~/.vim/bundle && \
+    curl -LSso ~/.vim/autoload/pathogen.vim https://tpo.pe/pathogen.vim
+RUN mkdir -p ~/.vim/bundle
+RUN cd ~/.vim/bundle && \
+    git clone https://github.com/scrooloose/nerdtree.git && \
+    git clone https://github.com/vim-syntastic/syntastic.git && \
+    git clone https://github.com/vim-airline/vim-airline.git && \
+    git clone https://github.com/altercation/vim-colors-solarized.git && \
+    git clone https://github.com/bazelbuild/vim-ft-bzl.git && \
+    git clone https://github.com/google/vim-maktaba.git && \
+    git clone https://github.com/google/vim-codefmt.git
+RUN curl -LSso ~/.vimrc  https://gist.githubusercontent.com/llhe/71c5802919debd5825c100c0135478a7/raw/16a35020cc65f9c25d0cf8f11a3ba7b345a1271d/.vimrc
+
+# Upgrade CMake
+RUN wget https://cmake.org/files/v3.11/cmake-3.11.3-Linux-x86_64.tar.gz -P /tmp/ && \
+    tar zxf /tmp/cmake-3.11.3-Linux-x86_64.tar.gz --strip-components=1 -C /usr/local/ && \
+    update-alternatives --install /usr/bin/cmake cmake /usr/local/bin/cmake 1 --force && \
+    rm -f /tmp/cmake-3.11.3-Linux-x86_64.tar.gz
+
+# mace-dev-lite image already included NDK r15c
+## Download other NDK r12b
+RUN cd /opt/ && \
+    wget -q https://dl.google.com/android/repository/android-ndk-r12b-linux-x86_64.zip && \
+    unzip -q android-ndk-r12b-linux-x86_64.zip && \
+    rm -f android-ndk-r12b-linux-x86_64.zip
+## Download other NDK r16
+RUN cd /opt/ && \
+    wget -q https://dl.google.com/android/repository/android-ndk-r16-linux-x86_64.zip && \
+    unzip -q android-ndk-r16-linux-x86_64.zip && \
+    rm -f android-ndk-r16-linux-x86_64.zip

docs/getting_started/how_to_build.rst

@@ -72,14 +72,13 @@ you can build the image from it,
 
 .. code:: sh
 
-    cd docker
-    docker build -t xiaomimace/mace-dev
+    docker build -t registry.cn-hangzhou.aliyuncs.com/xiaomimace/mace-dev-lite ./docker/mace-dev-lite
 
 or pull the pre-built image from Docker Hub,
 
 .. code:: sh
 
-    docker pull xiaomimace/mace-dev
+    docker pull registry.cn-hangzhou.aliyuncs.com/xiaomimace/mace-dev-lite
 
 and then run the container with the following command.
 
@@ -87,8 +86,10 @@ and then run the container with the following command.
 
     # Create container
     # Set 'host' network to use ADB
-    docker run -it --rm --privileged -v /dev/bus/usb:/dev/bus/usb --net=host \ 
-               -v /local/path:/container/path xiaomimace/mace-dev /bin/bash
+    docker run -it --privileged -v /dev/bus/usb:/dev/bus/usb --net=host \
+               -v /local/path:/container/path \
+               registry.cn-hangzhou.aliyuncs.com/xiaomimace/mace-dev-lite \
+               /bin/bash
 
 
 Usage