/
xgdmatrix.go
143 lines (113 loc) · 3.66 KB
/
xgdmatrix.go
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package core
/*
#cgo LDFLAGS: -lxgboost
#include <xgboost/c_api.h>
#include <stdio.h>
#include <stdlib.h>
*/
import "C"
import (
"errors"
"reflect"
"runtime"
"unsafe"
)
// ErrNotSuccessful returned when an action fails
var ErrNotSuccessful = errors.New("not succesfull")
// XGDMatrix matrix
type XGDMatrix struct {
handle C.DMatrixHandle
cols int
rows int
}
// NumRow get number of rows.
func (matrix *XGDMatrix) NumRow() (uint32, error) {
var count C.bst_ulong
if err := checkError(C.XGDMatrixNumRow(matrix.handle, &count)); err != nil {
return 0, err
}
return uint32(count), nil
}
// NumCol get number of cols.
func (matrix *XGDMatrix) NumCol() (uint32, error) {
var count C.bst_ulong
if err := checkError(C.XGDMatrixNumCol(matrix.handle, &count)); err != nil {
return 0, err
}
return uint32(count), nil
}
// SetUIntInfo set uint32 vector to a content in info
func (matrix *XGDMatrix) SetUIntInfo(field string, values []uint32) error {
cstr := C.CString(field)
defer C.free(unsafe.Pointer(cstr))
res := C.XGDMatrixSetUIntInfo(matrix.handle, cstr, (*C.uint)(&values[0]), C.bst_ulong(len(values)))
runtime.KeepAlive(values)
return checkError(res)
}
// SetGroup set label of the training matrix
func (matrix *XGDMatrix) SetGroup(group ...uint32) error {
res := C.XGDMatrixSetGroup(matrix.handle, (*C.uint)(&group[0]), C.bst_ulong(len(group)))
runtime.KeepAlive(group)
return checkError(res)
}
// SetFloatInfo set float vector to a content in info
func (matrix *XGDMatrix) SetFloatInfo(field string, values []float32) error {
cstr := C.CString(field)
defer C.free(unsafe.Pointer(cstr))
res := C.XGDMatrixSetFloatInfo(matrix.handle, cstr, (*C.float)(&values[0]), C.bst_ulong(len(values)))
if err := checkError(res); err != nil {
return err
}
runtime.KeepAlive(values)
return nil
}
// GetFloatInfo get float info vector from matrix
func (matrix *XGDMatrix) GetFloatInfo(field string) ([]float32, error) {
cstr := C.CString(field)
defer C.free(unsafe.Pointer(cstr))
var outLen C.bst_ulong
var outResult *C.float
if err := checkError(C.XGDMatrixGetFloatInfo(matrix.handle, cstr, &outLen, &outResult)); err != nil {
return nil, err
}
var list []float32
sliceHeader := (*reflect.SliceHeader)((unsafe.Pointer(&list)))
sliceHeader.Cap = int(outLen)
sliceHeader.Len = int(outLen)
sliceHeader.Data = uintptr(unsafe.Pointer(outResult))
return copyFloat32Slice(list), nil
}
// GetUIntInfo get uint32 info vector from matrix
func (matrix *XGDMatrix) GetUIntInfo(field string) ([]uint32, error) {
cstr := C.CString(field)
defer C.free(unsafe.Pointer(cstr))
var outLen C.bst_ulong
var outResult *C.uint
if err := checkError(C.XGDMatrixGetUIntInfo(matrix.handle, cstr, &outLen, &outResult)); err != nil {
return nil, err
}
var list []uint32
sliceHeader := (*reflect.SliceHeader)((unsafe.Pointer(&list)))
sliceHeader.Cap = int(outLen)
sliceHeader.Len = int(outLen)
sliceHeader.Data = uintptr(unsafe.Pointer(outResult))
return copyUint32Slice(list), nil
}
func xdgMatrixFinalizer(mat *XGDMatrix) {
C.XGDMatrixFree(mat.handle)
}
// XGDMatrixCreateFromMat create matrix content from dense matrix
func XGDMatrixCreateFromMat(data []float32, nrows int, ncols int, missing float32) (*XGDMatrix, error) {
if len(data) != nrows*ncols {
return nil, errors.New("data length doesn't match given dimensions")
}
var out C.DMatrixHandle
res := C.XGDMatrixCreateFromMat((*C.float)(&data[0]), C.bst_ulong(nrows), C.bst_ulong(ncols), C.float(missing), &out)
if err := checkError(res); err != nil {
return nil, err
}
matrix := &XGDMatrix{handle: out, rows: nrows, cols: ncols}
runtime.SetFinalizer(matrix, xdgMatrixFinalizer)
runtime.KeepAlive(data)
return matrix, nil
}