Tensorflow Lite 编译

这篇文章就简单介绍一下如何编译动态库

clone 代码

git clone https://github.com/tensorflow/tensorflow.git

修改TensorFlow项目根下的WROKSPACE文件

将以下代码反注释

# Uncomment and update the paths in these entries to build the Android demo. android_sdk_repository( name = “androidsdk”, api_level = 23, # Ensure that you have the build_tools_version below installed in the # SDK manager as it updates periodically. build_tools_version = “26.0.1”, # Replace with path to Android SDK on your system path = “/Users/lizhangqu/AndroidSDK”, ) # android_ndk_repository( name=”androidndk”, path=”/Users/lizhangqu/AndroidNDK/android-ndk-r14b”, # This needs to be 14 or higher to compile TensorFlow. # Please specify API level to >= 21 to build for 64-bit # archtectures or the Android NDK will automatically select biggest # API level that it supports without notice. # Note that the NDK version is not the API level. api_level=14)

然后修改android_sdk_repository中的path为自己电脑中的android sdk目录，修改android_ndk_repository中的path为自己电脑的android ndk目录。

值得注意的是，ndk的版本，官方建议使用大于r14的版本，下载地址android-ndk-r14b-darwin-x86_64.zip

编译

确保必要的工具已经安装，如bazel

bazel build –cxxopt=’–std=c++11′ //tensorflow/contrib/lite/java:tensorflowlite \ –crosstool_top=//external:android/crosstool \ –host_crosstool_top=@bazel_tools//tools/cpp:toolchain \ –cpu=armeabi

编译其他ABI请修改cpu参数，分别为

–cpu=armeabi –cpu=armeabi-v7a –cpu=arm64-v8a –cpu=mips –cpu=mips64 –cpu=x86 –cpu=x86_64

产物位于

bazel-bin/tensorflow/contrib/lite/java/libtensorflowlite_jni.so bazel-bin/tensorflow/contrib/lite/java/libtensorflowlitelib.jar

注意编译mips和mips64的时候，需要将构建脚本稍微修改一下，删除一部分代码，否则会报错

找到/tensorflow/contrib/lite/build_def.bzl文件，找到如下代码

def tflite_linkopts_unstripped(): “””Defines linker flags to reduce size of TFLite binary. These are useful when trying to investigate the relative size of the symbols in TFLite. Returns: a select object with proper linkopts “”” return select({ “//tensorflow:android”: [ “-Wl,–no-export-dynamic”, # Only inc syms referenced by dynamic obj. “-Wl,–exclude-libs,ALL”, # Exclude syms in all libs from auto export. “-Wl,–gc-sections”, # Eliminate unused code and data. “-Wl,–as-needed”, # Don’t link unused libs. ], “//tensorflow/contrib/lite:mips”: [], “//tensorflow/contrib/lite:mips64”: [], “//conditions:default”: [ “-Wl,–icf=all”, # Identical code folding. ], }) def tflite_jni_linkopts_unstripped(): “””Defines linker flags to reduce size of TFLite binary with JNI. These are useful when trying to investigate the relative size of the symbols in TFLite. Returns: a select object with proper linkopts “”” return select({ “//tensorflow:android”: [ “-Wl,–gc-sections”, # Eliminate unused code and data. “-Wl,–as-needed”, # Don’t link unused libs. ], “//tensorflow/contrib/lite:mips”: [], “//tensorflow/contrib/lite:mips64”: [], “//conditions:default”: [ “-Wl,–icf=all”, # Identical code folding. ], })

将上面代码中的下面这段删除

“//tensorflow:android”: [ “-Wl,–no-export-dynamic”, # Only inc syms referenced by dynamic obj. “-Wl,–exclude-libs,ALL”, # Exclude syms in all libs from auto export. “-Wl,–gc-sections”, # Eliminate unused code and data. “-Wl,–as-needed”, # Don’t link unused libs. ],

以及这一段也删除

“//tensorflow:android”: [ “-Wl,–gc-sections”, # Eliminate unused code and data. “-Wl,–as-needed”, # Don’t link unused libs. ],

临时删除后，编译完mips和mips64还原即可，不然会报如下错误

ERROR: /Users/lizhangqu/Desktop/tensorflow/tensorflow/contrib/lite/java/BUILD:133:1: Illegal ambiguous match on configurable attribute “linkopts” in //tensorflow/contrib/lite/java:libtensorflowlite_jni.so: //tensorflow/contrib/lite:mips //tensorflow:android Multiple matches are not allowed unless one is unambiguously more specialized. ERROR: Analysis of target ‘//tensorflow/contrib/lite/java:tensorflowlite’ failed; build aborted: /Users/lizhangqu/Desktop/tensorflow/tensorflow/contrib/lite/java/BUILD:133:1: Illegal ambiguous match on configurable attribute “linkopts” in //tensorflow/contrib/lite/java:libtensorflowlite_jni.so: //tensorflow/contrib/lite:mips //tensorflow:android Multiple matches are not allowed unless one is unambiguously more specialized.

ERROR: /Users/lizhangqu/Desktop/tensorflow/tensorflow/contrib/lite/java/BUILD:133:1: Illegal ambiguous match on configurable attribute "linkopts" in //tensorflow/contrib/lite/java:libtensorflowlite_jni.so:
//tensorflow/contrib/lite:mips64
//tensorflow:android
Multiple matches are not allowed unless one is unambiguously more specialized.
ERROR: Analysis of target '//tensorflow/contrib/lite/java:tensorflowlite' failed; build aborted:

/Users/lizhangqu/Desktop/tensorflow/tensorflow/contrib/lite/java/BUILD:133:1: Illegal ambiguous match on configurable attribute "linkopts" in //tensorflow/contrib/lite/java:libtensorflowlite_jni.so:
//tensorflow/contrib/lite:mips64
//tensorflow:android
Multiple matches are not allowed unless one is unambiguously more specialized.