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converter.go
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/
converter.go
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package gannoy
import (
"bytes"
"encoding/binary"
"encoding/csv"
"fmt"
"io"
"os"
"path/filepath"
"strconv"
"syscall"
)
func NewConverter(from string, dim, tree, K int, order binary.ByteOrder) Converter {
if filepath.Ext(from) == ".csv" {
return csvConverter{
dim: dim,
tree: tree,
K: K,
order: order,
}
} else {
return converter{
dim: dim,
tree: tree,
K: K,
order: order,
}
}
}
type Converter interface {
Convert(string, string, string, string) error
}
type converter struct {
dim int
tree int
K int
order binary.ByteOrder
}
func (c converter) Convert(from, path, to, mapPath string) error {
ann, err := os.Open(from)
if err != nil {
return err
}
defer ann.Close()
var maps map[int]int
if mapPath != "" {
maps, err = c.initializeMaps(mapPath)
if err != nil {
return err
}
}
err = CreateMeta(path, to, c.tree, c.dim, c.K)
if err != nil {
return err
}
gannoy, err := NewGannoyIndex(filepath.Join(path, to+".meta"), Angular{}, RandRandom{})
if err != nil {
return err
}
stat, _ := ann.Stat()
count := int(stat.Size() / c.nodeSize())
keys := make([]int, count)
vecs := make([][]float64, count)
for i := 0; i < count; i++ {
b := make([]byte, c.nodeSize())
_, err = syscall.Pread(int(ann.Fd()), b, c.offset(i))
if err != nil {
return err
}
buf := bytes.NewReader(b)
var nDescendants int32
binary.Read(buf, c.order, &nDescendants)
if int(nDescendants) != 1 {
break
}
buf.Seek(int64(4*2), io.SeekCurrent) // skip children
vec := make([]float64, c.dim)
binary.Read(buf, c.order, &vec)
key := i
if mapPath != "" {
if k, ok := maps[i]; ok {
key = k
} else {
return fmt.Errorf("Index is not found in mapping file.\n")
}
}
keys[i] = key
vecs[i] = vec
}
return gannoy.AddItems(keys, vecs)
}
func (c converter) offset(index int) int64 {
return c.nodeSize() * int64(index)
}
func (c converter) nodeSize() int64 {
return int64(4 + // n_descendants
4*2 + // children[2]
8*c.dim) // v[1]
}
func (c converter) initializeMaps(path string) (map[int]int, error) {
maps := map[int]int{}
file, err := os.Open(path)
if err != nil {
return maps, err
}
defer file.Close()
reader := csv.NewReader(file)
for {
record, err := reader.Read()
if err == io.EOF {
break
} else if err != nil {
return maps, err
}
key, err := strconv.Atoi(record[0])
if err != nil {
return maps, err
}
index, err := strconv.Atoi(record[1])
if err != nil {
return maps, err
}
maps[index] = key
}
return maps, nil
}
type csvConverter struct {
dim int
tree int
K int
order binary.ByteOrder
}
func (c csvConverter) Convert(from, path, to, mapPath string) error {
file, err := os.Open(from)
if err != nil {
return err
}
defer file.Close()
err = CreateMeta(path, to, c.tree, c.dim, c.K)
if err != nil {
return err
}
gannoy, err := NewGannoyIndex(filepath.Join(path, to+".meta"), Angular{}, RandRandom{})
if err != nil {
return err
}
reader := csv.NewReader(file)
keys := []int{}
vecs := [][]float64{}
for {
record, err := reader.Read()
if err == io.EOF {
break
}
if err != nil {
return err
}
key, err := strconv.Atoi(record[0])
if err != nil {
return err
}
vec := make([]float64, c.dim)
for i, f := range record[1:] {
if feature, err := strconv.ParseFloat(f, 64); err != nil {
return err
} else {
vec[i] = feature
}
}
keys = append(keys, key)
vecs = append(vecs, vec)
}
return gannoy.AddItems(keys, vecs)
}