在 Android 上使用 TensorFlow 的 C++ 库

Question

我正在尝试为 Android 应用程序构建本机 C++ 库。这个库在内部使用了 Tensorflow C++ API（版本 1.9.0 和 1.10.0）和 OpenCV(3.3.0)。为了生成包装器，我使用的是 Swig。我正在使用 Android NDK 构建 *.so 文件（我尝试过使用不同版本的 NDK 版本 10、14、15、17）。 我已经从源代码构建了 *.a (libtensorflow-core.a, nsync.a, libprotobuf.a) 文件。

defaultConfig {
    minSdkVersion 21
    targetSdkVersion 28
}

我有下一个文件： Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS) 
LOCAL_MODULE    := libnsync
LOCAL_SRC_FILES := $(PATH_TO_TENSORFLOW)/tensorflow/contrib/makefile/downloads/nsync/builds/armeabi-v7a.android.c++11/nsync.a
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE    := libprotobuf
LOCAL_SRC_FILES := $(PATH_TO_TENSORFLOW)/tensorflow/contrib/makefile/gen/protobuf_android/armeabi-v7a/lib/libprotobuf.a
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE    := libtensorflow
LOCAL_SRC_FILES := $(PATH_TO_TENSORFLOW)/tensorflow/contrib/makefile/gen/lib/android_armeabi-v7a/libtensorflow-core.a
LOCAL_EXPORT_C_INCLUDES := \
  $(PATH_TO_TENSORFLOW) \
  $(PATH_TO_TENSORFLOW)/tensorflow/contrib/makefile/gen/host_obj \
  $(PATH_TO_TENSORFLOW)/tensorflow/contrib/makefile/downloads/eigen \
  $(PATH_TO_TENSORFLOW)/tensorflow/contrib/makefile/gen/protobuf_android/armeabi-v7a/include \
  $(PATH_TO_TENSORFLOW)/tensorflow/core/public \
  $(PATH_TO_TENSORFLOW)/tensorflow/contrib/makefile/downloads/nsync/public
LOCAL_STATIC_LIBRARIES += libprotobuf libnsync
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_ARM_NEON := true
OPENCV_CAMERA_MODULES := off
include $(OPENCV_PACKAGE_DIR)/native/jni/OpenCV.mk

LOCAL_MODULE    := libOcr
LOCAL_SRC_FILES := ocr/Ocr_wrap.cxx
LOCAL_LDLIBS    += -landroid -llog -ldl
LOCAL_CPPFLAGS  += -std=c++11
LOCAL_STATIC_LIBRARIES += libprotobuf libtensorflow

include $(BUILD_SHARED_LIBRARY)

Application.mk

APP_STL := gnustl_shared
APP_CPPFLAGS := -frtti -fexceptions
APP_ABI :=  armeabi-v7a
APP_PLATFORM := android-21 #updated from 19 to 21
APP_OPTIM := release
LOCAL_ARM_NEON := true

在构建过程中，我遇到了很多错误，最后一个是：

[armeabi-v7a] SharedLibrary  : libOcr.so
[armeabi-v7a] Install        : liblept.so => libs/armeabi-v7a/liblept.so
[armeabi-v7a] Install        : libtess.so => libs/armeabi-v7a/libtess.so
[armeabi-v7a] Install        : libgnustl_shared.so => libs/armeabi-v7a/libgnustl_shared.so
/Users/tensorflow/tensorflow/contrib/makefile/gen/lib/android_armeabi-v7a/libtensorflow-core.a(str_util.o):str_util.cc:function tensorflow::str_util::CUnescape(tensorflow::StringPiece, std::string*, std::string*): error: undefined reference to 'std::__throw_out_of_range_fmt(char const*, ...)'
/Users/tensorflow/tensorflow/contrib/makefile/gen/lib/android_armeabi-v7a/libtensorflow-core.a(log_memory.o):log_memory.cc:function tensorflow::LogMemory::RecordStep(long long, std::string const&): error: undefined reference to 'std::__throw_out_of_range_fmt(char const*, ...)'
/Users/tensorflow/tensorflow/contrib/makefile/gen/lib/android_armeabi-v7a/libtensorflow-core.a(log_memory.o):log_memory.cc:function tensorflow::LogMemory::RecordTensorAllocation(std::string const&, long long, tensorflow::Tensor const&): error: undefined reference to 'std::__throw_out_of_range_fmt(char const*, ...)'
/Users/tensorflow/tensorflow/contrib/makefile/gen/lib/android_armeabi-v7a/libtensorflow-core.a(log_memory.o):log_memory.cc:function tensorflow::LogMemory::RecordTensorDeallocation(long long, std::string const&): error: undefined reference to 'std::__throw_out_of_range_fmt(char const*, ...)'
collect2: error: ld returned 1 exit status
make: *** [/Users/app/app/src/main/obj/local/armeabi-v7a/libOcr.so] Error 1
make: Leaving directory `/Users/app/app/src/main/jni'
:sdk:buildNative FAILED

FAILURE: Build failed with an exception.

为了构建 *.so 文件，我使用 build.gradle 文件中的下一个任务：

commandLine "$ndkDir/ndk-build",
            '-C', file('src/main/jni').absolutePath,
            '-j', Runtime.runtime.availableProcessors(),
            'all',
            'NDK_LOG=1'

尊敬的社区，请帮助我解决这些问题。谢谢。

更新：APP_PLATFORM改成android-21，效果更好但仍有错误

Answer 1

我之前也遇到过这个问题，是便便库