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cbits.go
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cbits.go
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// +build linux,!ppc64le
package cntk
// #include <stdlib.h>
// #include "cbits/predict.hpp"
import "C"
import (
"context"
"unsafe"
"github.com/Unknwon/com"
"github.com/pkg/errors"
"github.com/rai-project/dlframework/framework/options"
nvidiasmi "github.com/rai-project/nvidia-smi"
"github.com/rai-project/tracer"
)
type Predictor struct {
ctx C.PredictorContext
options *options.Options
}
func New(ctx context.Context, opts0 ...options.Option) (*Predictor, error) {
span, _ := tracer.StartSpanFromContext(ctx, tracer.MODEL_TRACE, "c_new")
defer span.Finish()
opts := options.New(opts0...)
modelFile := string(opts.Graph())
if !com.IsFile(modelFile) {
return nil, errors.Errorf("file %s not found", modelFile)
}
modelFileString := C.CString(modelFile)
defer C.free(unsafe.Pointer(modelFileString))
deviceType := "CPU"
deviceId := 0
if opts.UsesGPU() {
if !nvidiasmi.HasGPU {
return nil, errors.New("no GPU device")
}
deviceType = "GPU"
for _, d := range opts.Devices() {
if d.Type() == options.CUDA_DEVICE {
deviceId = d.ID()
break
}
}
}
deviceTypeString := C.CString(deviceType)
defer C.free(unsafe.Pointer(deviceTypeString))
pred := C.NewCNTK(
modelFileString,
deviceTypeString,
C.int(deviceId),
)
if pred == nil {
log.Panicln("unable to create cntk predictor")
}
return &Predictor{
ctx: pred,
options: opts,
}, nil
}
func prod(arry []int) int {
accum := 1
for _, e := range arry {
accum *= e
}
return accum
}
func (p *Predictor) Predict(ctx context.Context, data []float32, outputLayerName0 string, shape []int) error {
if outputLayerName0 == "" {
return errors.New("expecting a valid (non-empty) output layer name")
}
outputLayerName := C.CString(outputLayerName0)
defer C.free(unsafe.Pointer(outputLayerName))
batchSize := p.options.BatchSize()
dataLen := len(data)
shapeLen := prod(shape)
inputCount := dataLen / shapeLen
if batchSize > inputCount {
padding := make([]float32, (batchSize-inputCount)*shapeLen)
data = append(data, padding...)
}
span, _ := tracer.StartSpanFromContext(ctx, tracer.MODEL_TRACE, "c_predict")
defer span.Finish()
ptr := (*C.float)(unsafe.Pointer(&data[0]))
ok := C.PredictCNTK(p.ctx, ptr, outputLayerName, C.int(batchSize))
if ok != 0 {
return errors.New("unable to perform cntk prediction")
}
return nil
}
func (p *Predictor) ReadPredictionOutput(ctx context.Context) ([]float32, error) {
span, _ := tracer.StartSpanFromContext(ctx, tracer.MODEL_TRACE, "c_read_prediction_output")
defer span.Finish()
batchSize := p.options.BatchSize()
predLen := int(C.GetPredLenCNTK(p.ctx))
length := batchSize * predLen
cPredictions := C.GetPredictionsCNTK(p.ctx)
if cPredictions == nil {
return nil, errors.New("empty predictions")
}
slice := (*[1 << 30]float32)(unsafe.Pointer(cPredictions))[:length:length]
return slice, nil
}
func (p Predictor) Close() {
C.DeleteCNTK(p.ctx)
}
func (p *Predictor) StartProfiling(name, metadata string) error {
cname := C.CString(name)
cmetadata := C.CString(metadata)
defer C.free(unsafe.Pointer(cname))
defer C.free(unsafe.Pointer(cmetadata))
C.StartProfilingCNTK(p.ctx, cname, cmetadata)
return nil
}
func (p *Predictor) EndProfiling() error {
C.EndProfilingCNTK(p.ctx)
return nil
}
func (p *Predictor) DisableProfiling() error {
C.DisableProfilingCNTK(p.ctx)
return nil
}
func (p *Predictor) ReadProfile() (string, error) {
cstr := C.ReadProfileCNTK(p.ctx)
if cstr == nil {
return "", errors.New("failed to read nil profile")
}
defer C.free(unsafe.Pointer(cstr))
return C.GoString(cstr), nil
}