Mobilenet Android version

[Nanamare]

https://github.com/nanamare/ncnn_mobilenet

[nihui]

thanks

one question about your code
you create ncnn::Mat with RGBA2BGR at

input = ncnn::Mat::from_pixels((const unsigned char *) pixelData, ncnn::Mat::PIXEL_RGBA2BGR, width, height);

https://github.com/nanamare/ncnn_mobilenet/blob/843bc386f2de866abbd353ec7610f766082a4648/ncnn_mobileNet/app/src/main/cpp/native-lib.cpp#L131

but the pre-process is for RGB

//mean subtraction
const float meanValues[3] = {103.94f, 116.78f, 123.68f}; // mobileNet mean value RGB 103.94f, 116.78f, 123.68f
input.substract_mean_normalize(meanValues, 0);

https://github.com/nanamare/ncnn_mobilenet/blob/843bc386f2de866abbd353ec7610f766082a4648/ncnn_mobileNet/app/src/main/cpp/native-lib.cpp#L140

so, the channel order is not consistent, is it ?

[Nanamare]

@nihui
OMG, my bad.
I have to put meanValues in reverse(BGR) or Image Load to RGB

[nihui]

the exact order shall be the one used in training phase, which is probably BGR in caffe, or RGB in mxnet

[Nanamare]

@nihui
Absolutely BGR in caffe! this model trained to using BGR format.

[billmguo]

any one meet the link issues in mac(Serria) or ubuntu(14.04) build, API 27, NDK r17

Error while executing process /Users/xxx/Library/Android/sdk/cmake/3.6.4111459/bin/cmake with arguments {--build /ncnn_mobilenet/ncnn_mobileNet/app/.externalNativeBuild/cmake/debug/arm64-v8a --target objectclassification}
[1/1] Linking CXX shared library ../../../../build/intermediates/cmake/debug/obj/arm64-v8a/libobjectclassification.so
FAILED: : && /Users/xxx/Library/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang++ --target=aarch64-none-linux-android --gcc-toolchain=/Users/xxx/Library/Android/sdk/ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64 --sysroot=/Users/xxx/Library/Android/sdk/ndk-bundle/sysroot -fPIC -isystem /Users/xxx/Library/Android/sdk/ndk-bundle/sysroot/usr/include/aarch64-linux-android -D__ANDROID_API__=23 -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,--noexecstack -Wformat -Werror=format-security -std=c++11 -fopenmp -O2 -fvisibility=hidden -fvisibility-inlines-hidden -fomit-frame-pointer -fstrict-aliasing -ffunction-sections -fdata-sections -ffast-math -std=c++11 -frtti -fexceptions -O0 -fno-limit-debug-info -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -nostdlib++ --sysroot /Users/xxx/Library/Android/sdk/ndk-bundle/platforms/android-23/arch-arm64 -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -L/Users/xxx/Library/Android/sdk/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/arm64-v8a -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libobjectclassification.so -o ../../../../build/intermediates/cmake/debug/obj/arm64-v8a/libobjectclassification.so CMakeFiles/objectclassification.dir/src/main/cpp/native-lib.cpp.o ../../../../src/main/jniLibs/arm64-v8a/libncnn.a -ljnigraphics -lz -llog -latomic -lm "/Users/xxx/Library/Android/sdk/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/arm64-v8a/libc++_static.a" "/Users/xxx/Library/Android/sdk/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/arm64-v8a/libc++abi.a" && :
../../../../src/main/jniLibs/arm64-v8a/libncnn.a(net.cpp.o): In function void std::_Destroy_aux<false>::__destroy<ncnn::Blob*>(ncnn::Blob*, ncnn::Blob*)': /home/pf/Android/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include/bits/stl_construct.h:(.text._ZN4ncnn3NetD2Ev+0x38): undefined reference to std::string::_Rep::_S_empty_rep_storage'
/home/pf/Android/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include/bits/stl_construct.h:(.text._ZN4ncnn3NetD2Ev+0x40): undefined reference to std::string::_Rep::_S_empty_rep_storage' ../../../../src/main/jniLibs/arm64-v8a/libncnn.a(net.cpp.o): In function std::string::_Rep::_M_dispose(std::allocator const&)':
/home/pf/Android/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include/bits/basic_string.h:249: undefined reference to std::string::_Rep::_M_destroy(std::allocator<char> const&)' ../../../../src/main/jniLibs/arm64-v8a/libncnn.a(net.cpp.o): In function void std::_Destroy_aux::__destroyncnn::Blob*(ncnn::Blob*, ncnn::Blob*)':
/home/pf/Android/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include/bits/stl_construct.h:(.text._ZN4ncnn3NetD2Ev+0x130): undefined reference to std::string::_Rep::_S_empty_rep_storage' /home/pf/Android/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include/bits/stl_construct.h:(.text._ZN4ncnn3NetD2Ev+0x138): undefined reference to std::string::_Rep::_S_empty_rep_storage'

[billmguo]

work on NDK16