Overview

Current versions

Step 1: Prepare

# Our build root, exported so that we can refer to it in this terminalexport ROOT="$PWD"# Clone this repositorygit clone --depth 1 https://github.com/msqr1/kaldi-wasm2 "$ROOT"# Enter that directorycd "$ROOT"

export WAFLAGS="-mbulk-memory -mnontrapping-fptoint -mmutable-globals -msign-ext"

Step 2: Emscripten

# Get EMSDKgit clone https://github.com/emscripten-core/emsdk.git# Enter that directorycd emsdk# Install Emscripten./emsdk install 3.1.69# Activate Emcripten./emsdk activate 3.1.69# Add Emscripten tools to current terminalsource ./emsdk_env.sh

Step 3: OpenFST

# Go to build rootcd "$ROOT"# Get OpenFSTwget https://www.openfst.org/twiki/pub/FST/FstDownload/openfst-1.8.4.tar.gz -O openfst.tgz# Decompressmkdir openfsttar -xzf openfst.tgz -C openfst --strip-component 1# Enter that directorycd openfst# OpenFST bug fixes# Invalid assignmentpatch -i "$ROOT"/patches/openfst/fst.h.patch ./src/include/fst/fst.h# Undefined member variablepatch -i "$ROOT"/patches/openfst/bi-table.h.patch ./src/include/fst/bi-table.h# Configuring static OpenFST with Ngram fstsCXXFLAGS="$WAFLAGS -O3 -fno-rtti" emconfigure ./configure --prefix="$ROOT/openfst-build" --enable-static --disable-shared --enable-ngram-fsts --disable-bin# Compile and install into prefixemmake make -j$(nproc) install > /dev/null

Step 4: OpenBLAS

# Go to build rootcd "$ROOT"# Get OpenBLASgit clone -b v0.3.28 --depth=1 https://github.com/OpenMathLib/OpenBLAS openblas# Enter that directorycd openblas# OpenBLAS hacks: remove march'es, fPIC, etc.patch -i "$ROOT"/patches/openblas/Makefile.riscv64.patch Makefile.riscv64patch -i "$ROOT"/patches/openblas/Makefile.prebuild.patch Makefile.prebuildpatch -i "$ROOT"/patches/openblas/Makefile.system.patch Makefile.system# Make single-threaded static OpenBLAS with just single and double precision# Change HOSTCC to the C compiler on your machine. Mine is gcc-12 from Debian 12CC=emcc HOSTCC=gcc-12 TARGET=RISCV64_GENERIC USE_THREAD=0 NO_SHARED=1 BINARY=32 BUILD_SINGLE=1 BUILD_DOUBLE=1 BUILD_BFLOAT16=0 BUILD_COMPLEX16=0 BUILD_COMPLEX=0 CFLAGS="$WAFLAGS -fno-exceptions -fno-rtti" make -j$(nproc) > /dev/null# Install into prefixPREFIX="$ROOT/openblas-build" NO_SHARED=1 make install

Step 5: Kaldi

# Go to build rootcd "$ROOT"# Get Kaldigit clone --depth 1 https://github.com/kaldi-asr/kaldi# Enter Kaldi sourcecd kaldi/src# Configuring static Kaldi with static installed dependenciesCXXFLAGS="$WAFLAGS -UHAVE_EXECINFO_H -g0 -O3 -msimd128" emconfigure ./configure --use-cuda=no --with-cudadecoder=no --static --static-math --static-fst --fst-root="$ROOT/openfst-build" --fst-version='1.8.4' --openblas-root="$ROOT/openblas-build" --host=WASM# Compile our targetmake -j$(nproc) online2 > /dev/null

Step 6: Clean up

# Go to build rootcd "$ROOT"# Clean uprm -rf openfst.tgz openfst openblas

Full command

export ROOT="$PWD"git clone --depth 1 https://github.com/msqr1/kaldi-wasm2 "$ROOT"cd "$ROOT"git clone --depth 1 https://github.com/emscripten-core/emsdk.gitcd emsdk./emsdk install 3.1.69./emsdk activate 3.1.69source emsdk_env.shcd "$ROOT"export WAFLAGS="-mbulk-memory -mnontrapping-fptoint -mmutable-globals -msign-ext"wget https://www.openfst.org/twiki/pub/FST/FstDownload/openfst-1.8.4.tar.gz -O openfst.tgzmkdir openfsttar -xzf openfst.tgz -C openfst --strip-component 1cd openfstCXXFLAGS="$WAFLAGS -O3 -fno-rtti" emconfigure ./configure --prefix="$ROOT/openfst-build" --enable-static --disable-shared --enable-ngram-fsts --disable-binemmake make -j$(nproc) install > /dev/nullcd "$ROOT"git clone -b v0.3.28 --depth=1 https://github.com/OpenMathLib/OpenBLAS openblascd openblaspatch -i "$ROOT"/patches/openblas/Makefile.riscv64.patch Makefile.riscv64patch -i "$ROOT"/patches/openblas/Makefile.prebuild.patch Makefile.prebuildpatch -i "$ROOT"/patches/openblas/Makefile.system.patch Makefile.systemCC=emcc HOSTCC=gcc-12 TARGET=RISCV64_GENERIC USE_THREAD=0 NO_SHARED=1 BINARY=32 BUILD_SINGLE=1 BUILD_DOUBLE=1 BUILD_BFLOAT16=0 BUILD_COMPLEX16=0 BUILD_COMPLEX=0 CFLAGS="$WAFLAGS -fno-exceptions -fno-rtti" make -j$(nproc) > /dev/nullPREFIX="$ROOT/openblas-build" NO_SHARED=1 make installcd "$ROOT"git clone --depth 1 https://github.com/kaldi-asr/kaldicd kaldi/srcCXXFLAGS="$WAFLAGS -UHAVE_EXECINFO_H -g0 -O3 -msimd128" emconfigure ./configure --use-cuda=no --with-cudadecoder=no --static --static-math --static-fst --fst-root="$ROOT/openfst-build" --fst-version='1.8.4' --openblas-root="$ROOT/openblas-build" --host=WASMmake -j$(nproc) online2 > /dev/nullcd "$ROOT"rm -rf openfst.tgz openfst openblas

Linking and running example

# Compiler flagsexport CXXFLAGS="-DOPENFST_VER=10803-I$ROOT/kaldi/src-I$ROOT/openfst-build/include-I$ROOT/openblas-build/include"# Linker flagsexport LDFLAGS="-L$ROOT/kaldi/src-l:online2/kaldi-online2.a        -l:decoder/kaldi-decoder.a-l:ivector/kaldi-ivector.a        -l:gmm/kaldi-gmm.a-l:tree/kaldi-tree.a              -l:feat/kaldi-feat.a-l:cudamatrix/kaldi-cudamatrix.a  -l:lat/kaldi-lat.a-l:hmm/kaldi-hmm.a                -l:nnet3/kaldi-nnet3.a-l:transform/kaldi-transform.a    -l:matrix/kaldi-matrix.a-l:fstext/kaldi-fstext.a          -l:util/kaldi-util.a-l:base/kaldi-base.a              -l:nnet2/kaldi-nnet2.a-L$ROOT/openfst-build/lib         -l:libfst.a-L$ROOT/openblas-build/lib        -l:libopenblas.a"# Go to build rootcd "$ROOT"# Generate .html, .js, and .wasmem++ $WAFLAGS -O3 $CXXFLAGS $LDFLAGS kaldi/src/nnet2/am-nnet-test.cc -o index.html