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Support save and restore of index (#2)
* Normalize to speed up distance calc * Support save and restore of index * fix
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| // Copyright (c) Roman Atachiants and contributors. All rights reserved. | ||
| // Licensed under the MIT license. See LICENSE file in the project root for details. | ||
|
|
||
| package search | ||
|
|
||
| import ( | ||
| "compress/flate" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
|
|
||
| "github.com/kelindar/iostream" | ||
| ) | ||
|
|
||
| // WriteTo writes the index to a writer. | ||
| func (b *Index[T]) WriteTo(dst io.Writer) (int64, error) { | ||
| w := iostream.NewWriter(dst) | ||
| i := w.Offset() | ||
|
|
||
| // Write version | ||
| if err := w.WriteUint8(1); err != nil { | ||
| return 0, err | ||
| } | ||
|
|
||
| // Write the index | ||
| err := w.WriteRange(len(b.arr), func(i int, w *iostream.Writer) error { | ||
| if err := w.WriteFloat32s(b.arr[i].Vector); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // Write the value (optional) | ||
| switch v := any(b.arr[i].Value).(type) { | ||
| case string: | ||
| return w.WriteString(v) | ||
| case []byte: | ||
| return w.WriteBytes(v) | ||
| default: | ||
| return nil | ||
| } | ||
| }) | ||
|
|
||
| return w.Offset() - i, err | ||
| } | ||
|
|
||
| // ReadFrom reads the index from a reader. | ||
| func (b *Index[T]) ReadFrom(src io.Reader) (int64, error) { | ||
| r := iostream.NewReader(src) | ||
| s := r.Offset() | ||
|
|
||
| // Read version | ||
| version, err := r.ReadUint8() | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
|
|
||
| if version != 1 { | ||
| return 0, fmt.Errorf("unsupported version: %d", version) | ||
| } | ||
|
|
||
| var length uint64 | ||
| if length, err = r.ReadUvarint(); err != nil { | ||
| return r.Offset() - s, err | ||
| } | ||
|
|
||
| // Allocate space for the entries | ||
| b.arr = make([]entry[T], length) | ||
| for i := 0; i < int(length); i++ { | ||
|
|
||
| // Read the vector | ||
| if b.arr[i].Vector, err = r.ReadFloat32s(); err != nil { | ||
| return r.Offset() - s, err | ||
| } | ||
|
|
||
| // Read the value (optional) | ||
| switch any(b.arr[i].Value).(type) { | ||
| case string: | ||
| v, err := r.ReadString() | ||
| if err != nil { | ||
| return r.Offset() - s, err | ||
| } | ||
| b.arr[i].Value = any(v).(T) | ||
|
|
||
| case []byte: | ||
| v, err := r.ReadBytes() | ||
| if err != nil { | ||
| return r.Offset() - s, err | ||
| } | ||
| b.arr[i].Value = any(v).(T) | ||
| } | ||
| } | ||
|
|
||
| return r.Offset() - s, nil | ||
| } | ||
|
|
||
| // ---------------------------------- File ---------------------------------- | ||
|
|
||
| // WriteFile writes the index into a flate-compressed binary file. | ||
| func (idx *Index[T]) WriteFile(filename string) error { | ||
| file, err := os.Create(filename) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| defer file.Close() | ||
| writer, err := flate.NewWriter(file, flate.DefaultCompression) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // WriteTo the underlying writer | ||
| defer writer.Close() | ||
| _, err = idx.WriteTo(writer) | ||
| return err | ||
| } | ||
|
|
||
| // ReadFile reads the index from a flate-compressed binary file. | ||
| func (idx *Index[T]) ReadFile(filename string) error { | ||
| file, err := os.Open(filename) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| defer file.Close() | ||
| _, err = idx.ReadFrom(flate.NewReader(file)) | ||
| return err | ||
| } |
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