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vector_index.go
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vector_index.go
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// Copyright (c) 2023 Couchbase, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build vectors
// +build vectors
package index
import (
"context"
"encoding/json"
"reflect"
)
var reflectStaticSizeVectorDoc int
func init() {
var vd VectorDoc
reflectStaticSizeVectorDoc = int(reflect.TypeOf(vd).Size())
}
type VectorReader interface {
// Next returns the next document similar to the vector, in this field, or nil
// when it reaches the end of the enumeration. The preAlloced VectorDoc
// is optional, and when non-nil, will be used instead of allocating memory.
Next(preAlloced *VectorDoc) (*VectorDoc, error)
// Advance resets the enumeration at specified document or its immediate
// follower.
Advance(ID IndexInternalID, preAlloced *VectorDoc) (*VectorDoc, error)
// Count returns the number of documents similar to the vector, in this field.
Count() uint64
Close() error
Size() int
}
type VectorIndexReader interface {
VectorReader(ctx context.Context, vector []float32, field string, k int64,
searchParams json.RawMessage) (VectorReader, error)
VectorReaderWithFilter(ctx context.Context, vector []float32, field string, k int64,
searchParams json.RawMessage, filterIDs []IndexInternalID) (VectorReader, error)
}
type VectorDoc struct {
Vector []float32
ID IndexInternalID
Score float64
}
func (vd *VectorDoc) Size() int {
return reflectStaticSizeVectorDoc + sizeOfPtr + len(vd.Vector) +
len(vd.ID)
}
// Reset allows an already allocated VectorDoc to be reused
func (vd *VectorDoc) Reset() *VectorDoc {
// remember the []byte used for the ID
id := vd.ID
// idiom to copy over from empty VectorDoc (0 allocations)
*vd = VectorDoc{}
// reuse the []byte already allocated (and reset len to 0)
vd.ID = id[:0]
return vd
}