add cosine similarity & 完善 PaperType

backend/utils/cosimi_test.go

@@ -0,0 +1,19 @@
+package utils
+
+import (
+	"math"
+	"testing"
+)
+
+func TestSimilarity(t *testing.T) {
+	r := Similarity([]uint8{1, 2, 3}, []uint8{1, 3, 4})
+	t.Log(r)
+	if math.Abs(r-0.9958705948858224) > 1e-6 {
+		t.Fail()
+	}
+	r = Similarity([]uint8{3, 2, 1}, []uint8{1, 3, 4})
+	t.Log(r)
+	if math.Abs(r-0.6813851438692469) > 1e-6 {
+		t.Fail()
+	}
+}