BuildGuideAndroidNDK.md

   1 # How to use the Android NDK to build ArmNN
   2
   3 *  [Introduction](#introduction)
   4 *  [Download the Android NDK and make a standalone toolchain](#downloadNDK)
   5 *  [Build the Boost C++ libraries](#buildBoost)
   6 *  [Build the Compute Library](#buildCL)
   7 *  [Build Google's Protobuf library](#buildProtobuf)
   8 *  [Download TensorFlow](#downloadTF)
   9 *  [Build ArmNN](#buildArmNN)
  10 *  [Run ArmNN UnitTests on an Android device](#runArmNNUnitTests)
  11
  12
  13 #### <a name="introduction">Introduction</a>
  14 These are step by step instructions for using the Android NDK to build ArmNN.
  15 They have been tested on a clean install of Ubuntu 18.04, and should also work with other OS versions.
  16 The instructions show how to build the ArmNN core library and the optional TensorFlow parser.
  17 All downloaded or generated files will be saved inside the `~/armnn-devenv` directory.
  18
  19 #### <a name="downloadNDK">Download the Android NDK and make a standalone toolchain</a>
  20
  21 * Download the Android NDK from [the official website](https://developer.android.com/ndk/downloads/index.html):
  22
  23      ```bash
  24      mkdir -p ~/armnn-devenv/toolchains
  25      cd ~/armnn-devenv/toolchains
  26      # For Mac OS, change the NDK download link accordingly.
  27      wget https://dl.google.com/android/repository/android-ndk-r20b-linux-x86_64.zip
  28      unzip android-ndk-r20b-linux-x86_64.zip
  29      export NDK=~/armnn-devenv/android-ndk-r20b
  30      export NDK_TOOLCHAIN_ROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64
  31      export PATH=$NDK_TOOLCHAIN_ROOT/bin/:$PATH
  32      ```
  33
  34          You may want to append the above export variables commands to your `~/.bashrc` (or `~/.bash_profile` in Mac OS).
  35
  36 * With the android ndk-20b, you don't need to use the make_standalone_toolchain script to create a toolchain for a specific version of android. Android's current preference is for you to just specify the architecture and operating system while setting the compiler and just use the ndk directory.
  37
  38 #### <a name="buildBoost">Build the Boost C++ libraries</a>
  39
  40 * Download Boost version 1.64:
  41
  42    ```bash
  43    mkdir ~/armnn-devenv/boost
  44    cd ~/armnn-devenv/boost
  45    wget https://dl.bintray.com/boostorg/release/1.64.0/source/boost_1_64_0.tar.bz2
  46    tar xvf boost_1_64_0.tar.bz2
  47    ```
  48
  49 * Build:
  50
  51         (Requires clang if not previously installed: `sudo apt-get install clang`)
  52         ```bash
  53         echo "using clang : arm : aarch64-linux-android<Android_API>-clang++ ;" > $HOME/armnn-devenv/boost/user-config.jam
  54         cd ~/armnn-devenv/boost/boost_1_64_0
  55         ./bootstrap.sh --prefix=$HOME/armnn-devenv/boost/install
  56         ./b2 install --user-config=$HOME/armnn-devenv/boost/user-config.jam \
  57      toolset=clang-arm link=static cxxflags=-fPIC \
  58          --with-test --with-log --with-program_options -j16
  59     ```
  60  Note: You can specify the 'Android_API' version you want. For example, if your ANDROID_API is 27 then the compiler will be aarch64-linux-android27-clang++.
  61
  62 #### <a name="buildCL">Build the Compute Library</a>
  63 * Clone the Compute Library:
  64
  65         (Requires Git if not previously installed: `sudo apt install git`)
  66
  67         ``` bash
  68         cd ~/armnn-devenv
  69         git clone https://github.com/ARM-software/ComputeLibrary.git
  70         ```
  71
  72 * Checkout ComputeLibrary branch:
  73         ```bash
  74         cd ComputeLibrary
  75         git checkout <branch_name>
  76         git pull
  77         ```
  78         For example, if you want to checkout release branch of 20.02:
  79         ```bash
  80         git checkout branches/arm_compute_20_02
  81         git pull
  82         ```
  83
  84 * Build:
  85
  86         (Requires SCons if not previously installed: `sudo apt install scons`)
  87         ```bash
  88         scons arch=arm64-v8a neon=1 opencl=1 embed_kernels=1 extra_cxx_flags="-fPIC" \
  89          benchmark_tests=0 validation_tests=0 os=android -j16
  90         ```
  91
  92 #### <a name="buildProtobuf">Build Google's Protobuf library</a>
  93
  94 * Clone protobuf:
  95         ```bash
  96         mkdir ~/armnn-devenv/google
  97         cd ~/armnn-devenv/google
  98         git clone https://github.com/google/protobuf.git
  99         cd protobuf
 100         git checkout -b v3.5.2 v3.5.2
 101         ```
 102
 103 * Build a native (x86) version of the protobuf libraries and compiler (protoc):
 104
 105         (Requires cUrl, autoconf, llibtool, and other build dependencies if not previously installed: `sudo apt install curl autoconf libtool build-essential g++`)
 106
 107         ```bash
 108         ./autogen.sh
 109         mkdir x86_build
 110         cd x86_build
 111         ../configure --prefix=$HOME/armnn-devenv/google/x86_pb_install
 112         make install -j16
 113         cd ..
 114         ```
 115
 116 * Build the arm64 version of the protobuf libraries:
 117
 118    ```bash
 119         mkdir arm64_build
 120         cd arm64_build
 121         CC=aarch64-linux-android<Android_API>-clang \
 122         CXX=aarch64-linux-android<Android_API>-clang++ \
 123         CFLAGS="-fPIE -fPIC" \
 124         LDFLAGS="-llog -lz -lc++_static" \
 125        ../configure --host=aarch64-linux-android \
 126        --prefix=$HOME/armnn-devenv/google/arm64_pb_install \
 127        --enable-cross-compile \
 128        --with-protoc=$HOME/armnn-devenv/google/x86_pb_install/bin/protoc
 129         make install -j16
 130         cd ..
 131         ```
 132
 133 #### <a name="downloadTF">Download TensorFlow</a>
 134 * Clone TensorFlow source code:
 135
 136         ```bash
 137         cd ~/armnn-devenv/google/
 138         git clone https://github.com/tensorflow/tensorflow.git
 139         cd tensorflow/
 140         git checkout 590d6eef7e91a6a7392c8ffffb7b58f2e0c8bc6b
 141         ```
 142
 143         You need tensorflow/contrib/makefile/tf_proto_files.txt from TensorFlow to generate TensorFlow protobuf definitions. This file is not available in TensorFlow master branch.
 144
 145 #### <a name="buildArmNN">Build ArmNN</a>
 146
 147 * Clone ArmNN source code:
 148
 149         ```bash
 150         cd ~/armnn-devenv/
 151         git clone https://github.com/ARM-software/armnn.git
 152         ```
 153
 154 * Checkout ArmNN branch:
 155
 156         ```bash
 157         cd armnn
 158         git checkout <branch_name>
 159         git pull
 160         ```
 161
 162         For example, if you want to checkout release branch of 20.02:
 163         ```bash
 164         git checkout branches/armnn_20_02
 165         git pull
 166         ```
 167
 168 * Generate TensorFlow protobuf definitions:
 169
 170         ```bash
 171         cd ~/armnn-devenv/google/tensorflow
 172         ~/armnn-devenv/armnn/scripts/generate_tensorflow_protobuf.sh \
 173          $HOME/armnn-devenv/google/tf_pb $HOME/armnn-devenv/google/x86_pb_install
 174         ```
 175
 176  * Build ArmNN:
 177
 178         (Requires CMake if not previously installed: `sudo apt install cmake`)
 179
 180         ```bash
 181         mkdir ~/armnn-devenv/armnn/build
 182         cd ~/armnn-devenv/armnn/build
 183         CXX=aarch64-linux-android<Android_API>-clang++ \
 184         CC=aarch64-linux-android<Android_API>-clang \
 185         CXX_FLAGS="-fPIE -fPIC" \
 186         cmake .. \
 187         -DCMAKE_ANDROID_NDK=$NDK \
 188         -DCMAKE_SYSTEM_NAME=Android \
 189         -DCMAKE_SYSTEM_VERSION=<Android_API> \
 190         -DCMAKE_ANDROID_ARCH_ABI=arm64-v8a \
 191         -DCMAKE_EXE_LINKER_FLAGS="-pie -llog -lz" \
 192         -DARMCOMPUTE_ROOT=$HOME/armnn-devenv/ComputeLibrary/ \
 193         -DARMCOMPUTE_BUILD_DIR=$HOME/armnn-devenv/ComputeLibrary/build \
 194         -DBOOST_ROOT=$HOME/armnn-devenv/boost/install/ \
 195         -DARMCOMPUTENEON=1 -DARMCOMPUTECL=1 -DARMNNREF=1 \
 196         -DTF_GENERATED_SOURCES=$HOME/armnn-devenv/google/tf_pb/ -DBUILD_TF_PARSER=1 \
 197         -DPROTOBUF_ROOT=$HOME/armnn-devenv/google/arm64_pb_install/
 198         ```
 199
 200         To include standalone sample dynamic backend tests, add the argument to enable the tests and the dynamic backend path to the CMake command:
 201
 202     ```bash
 203     -DSAMPLE_DYNAMIC_BACKEND=1 \
 204     -DDYNAMIC_BACKEND_PATHS=$SAMPLE_DYNAMIC_BACKEND_PATH
 205     ```
 206     Where $SAMPLE_DYNAMIC_BACKEND_PATH is the path where libArm_SampleDynamic_backend.so library file is pushed
 207
 208  * Run the build
 209     ```bash
 210     make -j16
 211     ```
 212
 213 #### <a name="buildStandaloneBackend">Build Standalone Sample Dynamic Backend</a>
 214 * The sample dynamic backend is located in armnn/src/dynamic/sample
 215     ```bash
 216     mkdir build
 217     cd build
 218     ```
 219
 220 * Use CMake to configure the build environment, update the following script and run it from the armnn/src/dynamic/sample/build directory to set up the armNN build:
 221     ```bash
 222     #!/bin/bash
 223     CXX=aarch64-linux-android<Android_API>-clang++ \
 224     CC=aarch64-linux-android<Android_API>-clang \
 225     CXX_FLAGS="-fPIE -fPIC" \
 226     cmake \
 227     -DCMAKE_SYSTEM_NAME=Android \
 228     -DCMAKE_CXX_FLAGS=--std=c++14 \
 229     -DCMAKE_EXE_LINKER_FLAGS="-pie -llog" \
 230     -DCMAKE_MODULE_LINKER_FLAGS="-llog" \
 231     -DBOOST_ROOT=$HOME/armnn-devenv/boost/install \
 232     -DBoost_SYSTEM_LIBRARY=$HOME/armnn-devenv/boost/install/lib/libboost_system.a \
 233     -DARMNN_PATH=$HOME/armnn-devenv/armnn/build/libarmnn.so ..
 234     ```
 235
 236 * Run the build
 237     ```bash
 238     make
 239     ```
 240
 241 #### <a name="runArmNNUnitTests">Run the ArmNN unit tests on an Android device</a>
 242
 243
 244 * Push the build results to an Android device and make symbolic links for shared libraries:
 245   Currently adb version we have used for testing is 1.0.41.
 246
 247         ```bash
 248         adb push libarmnnTfParser.so /data/local/tmp/
 249         adb push libarmnn.so /data/local/tmp/
 250         adb push libtimelineDecoder.so /data/local/tmp/
 251         adb push UnitTests /data/local/tmp/
 252         adb push $NDK/sources/cxx-stl/llvm-libc++/libs/arm64-v8a/libc++_shared.so /data/local/tmp/
 253         adb push $HOME/armnn-devenv/google/arm64_pb_install/lib/libprotobuf.so /data/local/tmp/libprotobuf.so.15.0.1
 254         adb shell 'ln -s libprotobuf.so.15.0.1 /data/local/tmp/libprotobuf.so.15'
 255         adb shell 'ln -s libprotobuf.so.15.0.1 /data/local/tmp/libprotobuf.so'
 256         ```
 257
 258 * Push the files needed for the unit tests (they are a mix of files, directories and symbolic links):
 259
 260         ```bash
 261         adb shell mkdir -p /data/local/tmp/src/backends/backendsCommon/test/testSharedObject
 262         adb push -p ~/armnn-devenv/armnn/build/src/backends/backendsCommon/test/testSharedObject/* /data/local/tmp/src/backends/backendsCommon/test/testSharedObject/
 263
 264         adb shell mkdir -p /data/local/tmp/src/backends/backendsCommon/test/testDynamicBackend
 265         adb push -p ~/armnn-devenv/armnn/build/src/backends/backendsCommon/test/testDynamicBackend/* /data/local/tmp/src/backends/backendsCommon/test/testDynamicBackend/
 266
 267         adb shell mkdir -p /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath1
 268         adb push -p ~/armnn-devenv/armnn/build/src/backends/backendsCommon/test/backendsTestPath1/* /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath1/
 269
 270         adb shell mkdir -p /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath2
 271         adb push -p ~/armnn-devenv/armnn/build/src/backends/backendsCommon/test/backendsTestPath2/Arm_CpuAcc_backend.so /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath2/
 272         adb shell ln -s Arm_CpuAcc_backend.so /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath2/Arm_CpuAcc_backend.so.1
 273         adb shell ln -s Arm_CpuAcc_backend.so.1 /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath2/Arm_CpuAcc_backend.so.1.2
 274         adb shell ln -s Arm_CpuAcc_backend.so.1.2 /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath2/Arm_CpuAcc_backend.so.1.2.3
 275         adb push -p ~/armnn-devenv/armnn/build/src/backends/backendsCommon/test/backendsTestPath2/Arm_GpuAcc_backend.so /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath2/
 276         adb shell ln -s nothing /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath2/Arm_no_backend.so
 277
 278         adb shell mkdir -p /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath3
 279
 280         adb shell mkdir -p /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath5
 281         adb push -p ~/armnn-devenv/armnn/build/src/backends/backendsCommon/test/backendsTestPath5/* /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath5/
 282
 283         adb shell mkdir -p /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath6
 284         adb push -p ~/armnn-devenv/armnn/build/src/backends/backendsCommon/test/backendsTestPath6/* /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath6/
 285
 286         adb shell mkdir -p /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath7
 287
 288         adb shell mkdir -p /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath9
 289         adb push -p ~/armnn-devenv/armnn/build/src/backends/backendsCommon/test/backendsTestPath9/* /data/local/tmp/src/backends/backendsCommon/test/backendsTestPath9/
 290
 291         adb shell mkdir -p /data/local/tmp/src/backends/dynamic/reference
 292         adb push -p ~/armnn-devenv/armnn/build/src/backends/dynamic/reference/Arm_CpuRef_backend.so /data/local/tmp/src/backends/dynamic/reference/
 293         ```
 294
 295         If the standalone sample dynamic tests are enabled, also push libArm_SampleDynamic_backend.so library file to the folder specified as $SAMPLE_DYNAMIC_BACKEND_PATH when ArmNN is built.
 296         This is the example when $SAMPLE_DYNAMIC_BACKEND_PATH is specified as /data/local/tmp/dynamic/sample/:
 297
 298         ```bash
 299         adb shell mkdir -p /data/local/tmp/dynamic/sample/
 300         adb push -p ${WORKING_DIR}/armnn/src/dynamic/sample/build/libArm_SampleDynamic_backend.so /data/local/tmp/dynamic/sample/
 301         ```
 302
 303 * Run ArmNN unit tests:
 304
 305         ```bash
 306         adb shell 'LD_LIBRARY_PATH=/data/local/tmp:/vendor/lib64:/vendor/lib64/egl /data/local/tmp/UnitTests'
 307         ```
 308
 309         If libarmnnUtils.a is present in `~/armnn-devenv/armnn/build/` and the unit tests run without failure then the build was successful.