[LibTorch-Lite] Add a custom flag to build LibTorch-Lite with LAPACK included

[anhappdev]

🚀 Feature

Add a custom flag to build LibTorch-Lite with LAPACK to ./scripts/build_ios.sh (and ./scripts/build_android.sh).

Motivation

There are many issues caused by error

RuntimeError: <some_function>: LAPACK library not found in compilation

when trying running TorchScript on mobile devices.
Since LibTorch-Lite from Cocoapods does not include LAPACK, the only option is to build it from source.

Pitch

We can build LibTorch-Lite from source with LAPACK included by setting the environment variable USE_LAPACK=1

Alternatives

Include LAPACK into LibTorch-Lite from Cocoapods

Additional context

I tried to build LibTorch-Lite for iOS from source with LAPACK included.
Some answers found on the internet suggest adding CMAKE_ARGS+=("-DUSE_LAPACK=ON") to the build script.

But it did not work in my case because in the file Dependencies.cmake#L1580 USE_LAPACK is first disabled with set(USE_LAPACK 0) then later in Dependencies.cmake#L1771 enabled if LAPACK_FOUND is true. And somehow it could not find LAPACK on my Mac.

My workaround for now is just comment out that line #set(USE_LAPACK 0) then the build run successfully with LAPACK included (no error when running on iOS).

Some related issues are:

• torch::stft function in LibTorch-Lite expects 0 < n_fft < 1, torch::fft_fft2 function says ATen not compiled with MKL, and LAPACK not found #66543
• Pytorch Mobile on Android, LAPACK library not found in compilation #61693
• https://discuss.pytorch.org/t/lapack-library-not-found-in-compilation-pytorch-mobile-android-java/126849
• https://discuss.pytorch.org/t/problems-with-lapack-on-ios/69240

[xta0]

@anhappdev Thanks for opening this issue. We'll consider including LAPACK support in our libraries. Thanks for all the detailed context!

[Gaozhongpai]

@anhappdev I tried to build LibTorch-Lite with LAPACK on iOS. I added CMAKE_ARGS+=("-DUSE_LAPACK=ON") to the build script and commented out that line # set(USE_LAPACK 0) in Dependencies.cmake#L1580. I can build it successfully. However, when I run on XCode, it still shows:

2022-06-08 09:32:31.275342-0400 ObjectDetection[16020:2681999] svd: LAPACK library not found in compilation.

My code is as follows:

#include <torch/script.h>
#include <ATen/Functions.h>

at::Tensor tensor_test = torch::ones({3,3});
auto result_test = at::svd(tensor_test);

Log:

MacBook-Pro pytorch-1.11 % BUILD_PYTORCH_MOBILE=1 IOS_PLATFORM=SIMULATOR ./scripts/build_ios.sh

+++ dirname ./scripts/build_ios.sh
++ cd ./scripts/..
++ pwd -P

• CAFFE2_ROOT=/Users/pi/program/pytorch-1.11
• CMAKE_ARGS=()
• '[' -z '' ']'
• CMAKE_ARGS+=("-DCMAKE_PREFIX_PATH=$(python -c 'import sysconfig; print(sysconfig.get_path("purelib"))')")
  ++ python -c 'import sysconfig; print(sysconfig.get_path("purelib"))'
• CMAKE_ARGS+=("-DPYTHON_EXECUTABLE=$(python -c 'import sys; print(sys.executable)')")
  ++ python -c 'import sys; print(sys.executable)'
• CMAKE_ARGS+=("-DBUILD_CUSTOM_PROTOBUF=OFF")
• '[' -n '' ']'
• '[' '' == 1 ']'
• CMAKE_ARGS+=("-DCMAKE_TOOLCHAIN_FILE=$CAFFE2_ROOT/cmake/iOS.cmake")
• '[' -n ']'
• CCACHE_WRAPPER_PATH=/usr/local/opt/ccache/libexec
• '[' -d /usr/local/opt/ccache/libexec ']'
• '[' -n SIMULATOR ']'
• CMAKE_ARGS+=("-DIOS_PLATFORM=${IOS_PLATFORM}")
• '[' SIMULATOR == WATCHOS ']'
• '[' -n '' ']'
• '[' '' == 0 ']'
• CMAKE_ARGS+=("-DBUILD_LITE_INTERPRETER=ON")
• '[' '' == 1 ']'
• CMAKE_ARGS+=("-DTRACING_BASED=OFF")
• '[' '' == 1 ']'
• CMAKE_ARGS+=("-DUSE_LIGHTWEIGHT_DISPATCH=OFF")
  + CMAKE_ARGS+=("-DUSE_LAPACK=ON")
• CMAKE_ARGS+=("-DUSE_LITE_INTERPRETER_PROFILER=OFF")
• CMAKE_ARGS+=("-DBUILD_TEST=OFF")
• CMAKE_ARGS+=("-DBUILD_BINARY=OFF")
• CMAKE_ARGS+=("-DBUILD_PYTHON=OFF")
• CMAKE_ARGS+=("-DUSE_CUDA=OFF")
• CMAKE_ARGS+=("-DUSE_GFLAGS=OFF")
• CMAKE_ARGS+=("-DUSE_OPENCV=OFF")
• CMAKE_ARGS+=("-DUSE_LMDB=OFF")
• CMAKE_ARGS+=("-DUSE_LEVELDB=OFF")
• CMAKE_ARGS+=("-DUSE_MPI=OFF")
• CMAKE_ARGS+=("-DUSE_NUMPY=OFF")
• CMAKE_ARGS+=("-DUSE_NNPACK=OFF")
• CMAKE_ARGS+=("-DUSE_MKLDNN=OFF")
• '[' '' == 1 ']'
• '[' '' == 1 ']'
• CMAKE_ARGS+=("-DCMAKE_THREAD_LIBS_INIT=-lpthread")
• CMAKE_ARGS+=("-DCMAKE_HAVE_THREADS_LIBRARY=1")
• CMAKE_ARGS+=("-DCMAKE_USE_PTHREADS_INIT=1")
• '[' '' == 1 ']'
• CMAKE_ARGS+=("-DCMAKE_CXX_FLAGS=-fobjc-arc")
• BUILD_ROOT=/Users/pi/program/pytorch-1.11/build_ios
• INSTALL_PREFIX=/Users/pi/program/pytorch-1.11/build_ios/install
• mkdir -p /Users/pi/program/pytorch-1.11/build_ios
• cd /Users/pi/program/pytorch-1.11/build_ios
• cmake /Users/pi/program/pytorch-1.11 -DCMAKE_INSTALL_PREFIX=/Users/pi/program/pytorch-1.11/build_ios/install -DCMAKE_BUILD_TYPE=MinSizeRel -DBUILD_SHARED_LIBS=OFF -DBLA_VENDOR=Generic -DCMAKE_PREFIX_PATH=/Users/pi/miniconda3/lib/python3.9/site-packages -DPYTHON_EXECUTABLE=/Users/pi/miniconda3/bin/python -DBUILD_CUSTOM_PROTOBUF=OFF -DCMAKE_TOOLCHAIN_FILE=/Users/pi/program/pytorch-1.11/cmake/iOS.cmake -DIOS_PLATFORM=SIMULATOR -DBUILD_LITE_INTERPRETER=ON -DTRACING_BASED=OFF -DUSE_LIGHTWEIGHT_DISPATCH=OFF -DUSE_LAPACK=ON -DUSE_LITE_INTERPRETER_PROFILER=OFF -DBUILD_TEST=OFF -DBUILD_BINARY=OFF -DBUILD_PYTHON=OFF -DUSE_CUDA=OFF -DUSE_GFLAGS=OFF -DUSE_OPENCV=OFF -DUSE_LMDB=OFF -DUSE_LEVELDB=OFF -DUSE_MPI=OFF -DUSE_NUMPY=OFF -DUSE_NNPACK=OFF -DUSE_MKLDNN=OFF -DCMAKE_THREAD_LIBS_INIT=-lpthread -DCMAKE_HAVE_THREADS_LIBRARY=1 -DCMAKE_USE_PTHREADS_INIT=1 -DCMAKE_CXX_FLAGS=-fobjc-arc
  Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/4.2.1
  -- CLANG_VERSION_STRING: Apple clang version 13.0.0 (clang-1300.0.29.30)
  Target: x86_64-apple-darwin20.6.0
  Thread model: posix
  InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

CMake Warning (dev) at /Users/pi/miniconda3/share/cmake-3.22/Modules/CMakeDependentOption.cmake:84 (message):
Policy CMP0127 is not set: cmake_dependent_option() supports full Condition
Syntax. Run "cmake --help-policy CMP0127" for policy details. Use the
cmake_policy command to set the policy and suppress this warning.
Call Stack (most recent call first):
CMakeLists.txt:255 (cmake_dependent_option)
This warning is for project developers. Use -Wno-dev to suppress it.

CMake Warning (dev) at /Users/pi/miniconda3/share/cmake-3.22/Modules/CMakeDependentOption.cmake:84 (message):
Policy CMP0127 is not set: cmake_dependent_option() supports full Condition
Syntax. Run "cmake --help-policy CMP0127" for policy details. Use the
cmake_policy command to set the policy and suppress this warning.
Call Stack (most recent call first):
CMakeLists.txt:286 (cmake_dependent_option)
This warning is for project developers. Use -Wno-dev to suppress it.

-- Could not find ccache. Consider installing ccache to speed up compilation.
CMake Warning at CMakeLists.txt:559 (message):
INTERN_BUILD_MOBILE is on, disabling BUILD_LAZY_TS_BACKEND

-- std::exception_ptr is supported.
-- Turning off deprecation warning due to glog.
-- Current compiler supports avx512f extension. Will build fbgemm.
-- Trying to find preferred BLAS backend of choice: Eigen
-- Using pocketfft in directory: /Users/pi/program/pytorch-1.11/third_party/pocketfft/
CMake Warning at cmake/Dependencies.cmake:834 (message):
Turning USE_FAKELOWP off as it depends on USE_FBGEMM.
Call Stack (most recent call first):
CMakeLists.txt:692 (include)

-- Using third party subdirectory Eigen.
-- Using third_party/pybind11.
-- pybind11 include dirs: /Users/pi/program/pytorch-1.11/cmake/../third_party/pybind11/include
-- Version: 7.0.3
-- Build type: MinSizeRel
-- CXX_STANDARD: 14
-- Required features: cxx_variadic_templates
-- Not using libkineto in a mobile build.
-- don't use NUMA
-- headers outputs:
-- sources outputs:
-- declarations_yaml outputs:
-- Using ATen parallel backend: NATIVE
disabling CUDA because USE_CUDA is set false
CMake Warning (dev) at aten/src/ATen/CMakeLists.txt:124:
Syntax Warning in cmake code at column 79

Argument not separated from preceding token by whitespace.
This warning is for project developers. Use -Wno-dev to suppress it.

AT_INSTALL_INCLUDE_DIR include/ATen/core
core header install: /Users/pi/program/pytorch-1.11/build_ios/aten/src/ATen/core/TensorBody.h
core header install: /Users/pi/program/pytorch-1.11/build_ios/aten/src/ATen/core/aten_interned_strings.h
disable aten test when BUILD_LITE_INTERPRETER is enabled
CMake Warning (dev) at torch/CMakeLists.txt:447:
Syntax Warning in cmake code at column 107

Argument not separated from preceding token by whitespace.
This warning is for project developers. Use -Wno-dev to suppress it.

CMake Warning (dev) at torch/CMakeLists.txt:447:
Syntax Warning in cmake code at column 115

Argument not separated from preceding token by whitespace.
This warning is for project developers. Use -Wno-dev to suppress it.

CMake Warning at CMakeLists.txt:1052 (message):
Generated cmake files are only fully tested if one builds with system glog,
gflags, and protobuf. Other settings may generate files that are not well
tested.

CMake Warning at CMakeLists.txt:1104 (message):
Generated cmake files are only available when building shared libs.

-- ******** Summary ********
-- General:
-- CMake version : 3.22.1
-- CMake command : /Users/pi/miniconda3/bin/cmake
-- System : Darwin
-- C++ compiler : /usr/bin/g++
-- C++ compiler id : AppleClang
-- C++ compiler version : 13.0.0.13000029
-- Using ccache if found : ON
-- Found ccache : CCACHE_PROGRAM-NOTFOUND
-- CXX flags : -fobjc-arc -Wno-deprecated -fvisibility-inlines-hidden -DUSE_PTHREADPOOL -DUSE_PYTORCH_QNNPACK -DUSE_XNNPACK -DBUILD_LITE_INTERPRETER -DSYMBOLICATE_MOBILE_DEBUG_HANDLE -O2 -fPIC -Wno-narrowing -Wall -Wextra -Werror=return-type -Wno-missing-field-initializers -Wno-type-limits -Wno-array-bounds -Wno-unknown-pragmas -Wno-unused-parameter -Wno-unused-function -Wno-unused-result -Wno-unused-local-typedefs -Wno-strict-overflow -Wno-strict-aliasing -Wno-error=deprecated-declarations -Wno-range-loop-analysis -Wno-pass-failed -Wno-error=pedantic -Wno-error=redundant-decls -Wno-error=old-style-cast -Wno-invalid-partial-specialization -Wno-typedef-redefinition -Wno-unknown-warning-option -Wno-unused-private-field -Wno-inconsistent-missing-override -Wno-aligned-allocation-unavailable -Wno-c++14-extensions -Wno-constexpr-not-const -Wno-missing-braces -Qunused-arguments -fcolor-diagnostics -fno-math-errno -fno-trapping-math -Werror=format -Werror=cast-function-type -Wno-unused-private-field -Wno-missing-braces -Wno-c++14-extensions -Wno-constexpr-not-const
-- Build type : MinSizeRel
-- Compile definitions :
-- CMAKE_PREFIX_PATH : /Users/pi/miniconda3/lib/python3.9/site-packages
-- CMAKE_INSTALL_PREFIX : /Users/pi/program/pytorch-1.11/build_ios/install
-- USE_GOLD_LINKER : OFF
-- TORCH_VERSION : 1.13.0
-- CAFFE2_VERSION : 1.13.0
-- BUILD_CAFFE2 : OFF
-- BUILD_CAFFE2_OPS : OFF
-- BUILD_CAFFE2_MOBILE : OFF
-- BUILD_STATIC_RUNTIME_BENCHMARK: OFF
-- BUILD_TENSOREXPR_BENCHMARK: OFF
-- BUILD_NVFUSER_BENCHMARK: OFF
-- BUILD_BINARY : OFF
-- BUILD_CUSTOM_PROTOBUF : OFF
-- Protobuf compiler :
-- Protobuf includes :
-- Protobuf libraries :
-- BUILD_DOCS : OFF
-- BUILD_PYTHON : OFF
-- BUILD_SHARED_LIBS : OFF
-- CAFFE2_USE_MSVC_STATIC_RUNTIME : ON
-- BUILD_TEST : OFF
-- BUILD_JNI : OFF
-- BUILD_MOBILE_AUTOGRAD : OFF
-- BUILD_LITE_INTERPRETER: ON
-- CROSS_COMPILING_MACOSX :
-- INTERN_BUILD_MOBILE : ON
-- USE_BLAS : 1
-- BLAS :
-- BLAS_HAS_SBGEMM :
-- USE_LAPACK : ON
-- LAPACK :
-- USE_ASAN : OFF
-- USE_CPP_CODE_COVERAGE : OFF
-- USE_CUDA : OFF
-- USE_ROCM : OFF
-- USE_EIGEN_FOR_BLAS : ON
-- USE_FBGEMM : OFF
-- USE_FAKELOWP : OFF
-- USE_KINETO : OFF
-- USE_FFMPEG : OFF
-- USE_GFLAGS : OFF
-- USE_GLOG : OFF
-- USE_LEVELDB : OFF
-- USE_LITE_PROTO : OFF
-- USE_LMDB : OFF
-- USE_METAL : ON
-- USE_PYTORCH_METAL : OFF
-- USE_PYTORCH_METAL_EXPORT : OFF
-- USE_MPS : OFF
-- USE_FFTW : OFF
-- USE_MKL :
-- USE_MKLDNN : OFF
-- USE_NCCL : OFF
-- USE_NNPACK : OFF
-- USE_NUMPY : OFF
-- USE_OBSERVERS : OFF
-- USE_OPENCL : OFF
-- USE_OPENCV : OFF
-- USE_OPENMP : OFF
-- USE_TBB : OFF
-- USE_VULKAN : OFF
-- USE_PROF : OFF
-- USE_QNNPACK : OFF
-- USE_PYTORCH_QNNPACK : ON
-- USE_XNNPACK : ON
-- USE_REDIS : OFF
-- USE_ROCKSDB : OFF
-- USE_ZMQ : OFF
-- USE_DISTRIBUTED : OFF
-- USE_DEPLOY : OFF
-- Public Dependencies : caffe2::Threads
-- Private Dependencies : eigen_blas;pthreadpool;cpuinfo;pytorch_qnnpack;XNNPACK;fp16;fmt::fmt-header-only
-- USE_COREML_DELEGATE : OFF
-- BUILD_LAZY_TS_BACKEND : OFF
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/pi/program/pytorch-1.11/build_ios
++ sysctl -n hw.ncpu

• cmake --build . -- -j8
  Consolidate compiler generated dependencies of target clog
  Consolidate compiler generated dependencies of target pthreadpool
  Consolidate compiler generated dependencies of target fmt
  Consolidate compiler generated dependencies of target eigen_blas
  [ 0%] Built target clog
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  [ 3%] Built target pytorch_qnnpack
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  [ 16%] Built target XNNPACK
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  [ 88%] Built target all_microkernels
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  Consolidate compiler generated dependencies of target torch
  [100%] Building CXX object caffe2/CMakeFiles/torch.dir/__/empty.cpp.o
  [100%] Linking CXX static library ../lib/libtorch.a
  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: ../lib/libtorch.a(empty.cpp.o) has no symbols
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  warning: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: archive library: ../lib/libtorch.a the table of contents is empty (no object file members in the library define global symbols)
  [100%] Built target torch
• echo 'Will install headers and libs to /Users/pi/program/pytorch-1.11/build_ios/install for further Xcode project usage.'
  Will install headers and libs to /Users/pi/program/pytorch-1.11/build_ios/install for further Xcode project usage.
• make install
  [ 0%] Built target eigen_blas
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  [ 2%] Built target pytorch_qnnpack
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  [ 88%] Built target ATEN_CPU_FILES_GEN_TARGET
  [100%] Built target torch_cpu
  Consolidate compiler generated dependencies of target torch
  [100%] Built target torch
  Install the project...
  -- Install configuration: "MinSizeRel"
  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: /Users/pi/program/pytorch-1.11/build_ios/install/lib/libXNNPACK.a(datatype-strings.c.o) has no symbols
  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: /Users/pi/program/pytorch-1.11/build_ios/install/lib/libXNNPACK.a(operator-strings.c.o) has no symbols
  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: /Users/pi/program/pytorch-1.11/build_ios/install/lib/libXNNPACK.a(subgraph-strings.c.o) has no symbols
  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: /Users/pi/program/pytorch-1.11/build_ios/install/lib/libc10.a(Storage.cpp.o) has no symbols
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  warning: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: archive library: /Users/pi/program/pytorch-1.11/build_ios/install/lib/libtorch.a the table of contents is empty (no object file members in the library define global symbols)
• echo 'Installation completed, now you can copy the headers/libs from /Users/pi/program/pytorch-1.11/build_ios/install to your Xcode project directory.'
  Installation completed, now you can copy the headers/libs from /Users/pi/program/pytorch-1.11/build_ios/install to your Xcode project directory.

Do you know what the problem is? Thanks

[anhappdev]

@Gaozhongpai The code involved overtime, so I don't know if there are any other changes in the build script. You may want to test with the commit I used at that time 7d8a79b6f31eccb94aa8ce38935917f476b534d5 to see if it works first.

[anhappdev]

@Gaozhongpai it was long time ago. I don’t have the files anymore.

[Gaozhongpai]

@anhappdev It works. Thanks