_example/flat_index_map.go: example test added to demonstrate usage

_example/flat_index_map/flat_index_map.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"fmt"
+	"github.com/DataIntelligenceCrew/go-faiss"
+)
+
+func main() {
+	dimension := 1
+	dbSize := 5
+
+	index, err := faiss.NewIndexFlat(dimension, faiss.MetricL2)
+	if err != nil {
+		fmt.Println(err.Error())
+	}
+	indexMap, err := faiss.NewIndexIDMap(index)
+	if err != nil {
+		fmt.Println(err.Error())
+	}
+	xb := []float32{1,2,3,4,5}
+	ids := make([]int64, dbSize)
+	for i := 0; i < dbSize; i++ {
+		ids[i] = int64(i)
+	}
+
+	err = indexMap.AddWithIDs(xb, ids)
+	if err != nil {
+		fmt.Println(err.Error())
+	}
+	toFind := xb[dimension:2*dimension]
+	distances1, resultIds, err := indexMap.Search(toFind, 5)
+	fmt.Println(distances1, resultIds, err)
+	fmt.Println(resultIds[0] == ids[1])
+	fmt.Println(distances1[0] == 0)
+
+}