Amalgamation and go binding for mxnet https://github.com/dmlc/mxnet
- Use
go get github.com/jdeng/gomxnetto install. If your openblas version happens to be 0.2.14_1 you are all set. - Update
predict.go: updateopenblaslibrary path accordingly (the first two lines).
...
//#cgo CXXFLAGS: -std=c++11 -I/usr/local/Cellar/openblas/0.2.14_1/include
//#cgo LDFLAGS: -L /usr/local/Cellar/openblas/0.2.14_1/lib/ -lopenblas
//#include <stdlib.h>
//#include "mxnet.h"
import "C"
import "unsafe"
...
go buildcould be slow when importing this library due to recompiling mxnet.cc every time. One workaround is manually building and linking mxnet.a. You will need to remove mxnet.cc to prevent go build compiling it. See below
cd $GOPATH/src/github.com/jdeng/gomxnet/amalgamation
sh build.sh
ls mxnet.a
rm ../mxnet.cc
And add one line to predict.go. It needs to be an absolute path.
//#cgo LDFLAGS: /<path-to-gopath>/src/github.com/jdeng/gomxnet/amalgamation/mxnet.a -lstdc++
- Build the sample
example/main.gowithgo buildin the example directory. You need to install a dependent library withgo get github.com/disintegration/imaging. ** Download the model file package from [https://github.com/dmlc/mxnet-model-gallery] and update the path inmain.go. Build withgo build. Try with./example cat15.jpg, the program should be able to recognize the cat. - Tested with golang 1.5.1 on Mac OS X Yosemite.
- Sample usage (from
src/main.go)
// read model files into memory
symbol, _ := ioutil.ReadFile("./Inception-symbol.json")
params, _ := ioutil.ReadFile("./Inception-0009.params")
// create predictor with model, device and input node config
batch := 1
pred, _ := gomxnet.NewPredictor(gomxnet.Model{symbol, params}, gomxnet.Device{gomxnet.CPU, 0}, []gomxnet.InputNode{{"data", []uint32{batch, 3, 224, 224}}})
// get input vector from 224 * 224 image(s)
input, _ := gomxnet.InputFrom([]image.Image{img}, gomxnet.ImageMean{117.0, 117.0, 117.0})
// feed forward
pred.Forward("data", input)
// get the first output node. length for each image is len(output) / batch
output, _ := pred.GetOutput(0)
// free the predictor
pred.Free()
- Check out mxnet, e.g., in ~/Sources/, update submodules and build
- Generate
mxnet.ccinamalgamationdirectory usingamalgamation/gen.sh(content shown below). You may need to update the first two lines to point to your mxnet and openblas locations.
export MXNET_ROOT=~/Source/mxnet
export OPENBLAS_ROOT=/usr/local/Cellar/openblas/0.2.14_1
rm -f ./mxnet
echo "Linking $MXNET_ROOT to ./mxnet"
ln -s $MXNET_ROOT ./mxnet
echo "Generating deps from $MXNET_ROOT to mxnet0.d with mxnet0.cc"
g++ -MD -MF mxnet0.d -std=c++11 -Wall -I ./mxnet/ -I ./mxnet/mshadow/ -I ./mxnet/dmlc-core/include -I ./mxnet/include -I$OPENBLAS_ROOT/include -c mxnet0.cc
echo "Generating amalgamation to mxnet.cc"
python ./expand.py
cp mxnet.cc ../
echo "Done"
- Merge openblas into the amalgamation?
- Add Train API?