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|
package llm
import (
"fmt"
"slices"
"testing"
)
type byteTokenizer struct{}
func (bt byteTokenizer) Tokenize(text string) []int {
r := make([]int, len(text))
for i := 0; i < len(text); i++ {
r[i] = int(text[i])
}
return r
}
func TestTokenBuffer_Push(t *testing.T) {
type gold struct {
window int
stride int
text string
expected [][]int64
}
tests := []gold{
{
window: 5, stride: 5,
text: "abcdefghij",
expected: [][]int64{{97, 98, 99, 100, 101}, {102, 103, 104, 105, 106}},
},
{
window: 4, stride: 2,
text: "abcdef",
expected: [][]int64{{97, 98, 99, 100}, {99, 100, 101, 102}},
},
{
window: 10, stride: 5,
text: "abcde",
expected: nil,
},
}
for _, tt := range tests {
t.Run(
fmt.Sprintf("window%d_stride%d", tt.window, tt.stride),
func(t *testing.T) {
tb := NewTokenBuffer(byteTokenizer{}, TokenBufferConfig{Window: tt.window, Stride: tt.stride})
tb.SetIncludeTail(false)
var got [][]int64
for w := range tb.Push(0, tt.text) {
got = append(got, w.Tokens)
}
if len(got) != len(tt.expected) {
t.Fatalf("expected %d windows but got %d", len(tt.expected), len(got))
}
for i := range got {
if !slices.Equal(got[i], tt.expected[i]) {
t.Errorf("window %d: expected %v but got %v", i, tt.expected[i], got[i])
}
}
},
)
}
}
func TestTokenBuffer_PushAccumulates(t *testing.T) {
tb := NewTokenBuffer(byteTokenizer{}, TokenBufferConfig{Window: 4, Stride: 4})
var got [][]int64
for w := range tb.Push(0, "ab") {
got = append(got, w.Tokens)
}
if len(got) != 0 {
t.Fatalf("expected 0 windows but got %d", len(got))
}
for w := range tb.Push(0, "cd") {
got = append(got, w.Tokens)
}
expected := [][]int64{{97, 98, 99, 100}}
if len(got) != len(expected) {
t.Fatalf("expected %d windows but got %d", len(expected), len(got))
}
for i := range got {
if !slices.Equal(got[i], expected[i]) {
t.Errorf("window %d: expected %v but got %v", i, expected[i], got[i])
}
}
}
func TestTokenBuffer_Tail(t *testing.T) {
tb := NewTokenBuffer(byteTokenizer{}, TokenBufferConfig{Window: 5, Stride: 5})
tb.SetIncludeTail(true)
var got [][]int64
for w := range tb.Push(0, "abcdef") {
got = append(got, w.Tokens)
}
if w, ok := tb.Tail(); ok {
got = append(got, w.Tokens)
}
expected := [][]int64{{97, 98, 99, 100, 101}, {102}}
if len(got) != len(expected) {
t.Fatalf("expected %d windows but got %d", len(expected), len(got))
}
for i := range got {
if !slices.Equal(got[i], expected[i]) {
t.Errorf("window %d: expected %v but got %v", i, expected[i], got[i])
}
}
}
func TestTokenBuffer_Position(t *testing.T) {
tb := NewTokenBuffer(byteTokenizer{}, TokenBufferConfig{Window: 4, Stride: 2})
tb.SetIncludeTail(false)
var positions []int
for range tb.Push(0, "abcdefgh") {
positions = append(positions, tb.Position())
}
expected := []int{0, 2, 4}
if len(positions) != len(expected) {
t.Fatalf("expected %d positions but got %d", len(expected), len(positions))
}
for i := range positions {
if positions[i] != expected[i] {
t.Errorf("window %d: expected positions=%d but got positions=%d", i, expected[i], positions[i])
}
}
tail, _ := tb.Tail()
if tailPosition := positions[len(positions)-1] + tail.Seen; tailPosition != 6 {
t.Errorf("expected tail positions=6 but got %d", tailPosition)
}
}
func TestTokenBuffer_DocumentBoundaryYieldsTail(t *testing.T) {
tb := NewTokenBuffer(byteTokenizer{}, TokenBufferConfig{Window: 10, Stride: 10})
tb.SetIncludeTail(true)
var a [][]int64
for w := range tb.Push(0, "abcde") {
a = append(a, w.Tokens)
}
if len(a) != 0 {
t.Fatalf("expected 0 windows but got %d", len(a))
}
var b [][]int64
for w := range tb.Push(2, "fghij") {
b = append(b, w.Tokens)
}
if len(b) != 1 {
t.Fatalf("expected 1 window but got %d", len(b))
}
expected := toInt64(byteTokenizer{}.Tokenize("abcde"))
if !slices.Equal(b[0], expected) {
t.Errorf("expected %v but got %v", expected, b[0])
}
}
func TestTokenBuffer_TailPosition(t *testing.T) {
tb := NewTokenBuffer(byteTokenizer{}, TokenBufferConfig{Window: 4, Stride: 2})
tb.SetIncludeTail(true)
var lastPosition int
for range tb.Push(0, "abcdefgh") {
lastPosition = tb.Position()
}
if lastPosition != 4 {
t.Errorf("expected last position=4 but got %d", lastPosition)
}
tail, _ := tb.Tail()
tailPosition := lastPosition + tail.Seen
if !slices.Equal(tail.Tokens, toInt64(byteTokenizer{}.Tokenize("gh"))) {
t.Errorf("unexpected tail: %v", tail.Tokens)
}
if tailPosition != 6 {
t.Errorf("expected tail position=6 but got %d", tailPosition)
}
}
func TestTokenBuffer_Pad(t *testing.T) {
type gold struct {
config TokenBufferConfig
text string
expected [][]int64
seen int
}
tests := []gold{
{
config: TokenBufferConfig{
Window: 4,
Stride: 2,
PadLeft: true,
PadRight: false,
PadTokenID: 0,
},
text: "abcdefg",
expected: [][]int64{{97, 98, 99, 100}, {99, 100, 101, 102}, {0, 101, 102, 103}},
seen: 3,
},
{
config: TokenBufferConfig{
Window: 4,
Stride: 2,
PadLeft: false,
PadRight: true,
PadTokenID: 0,
},
text: "abcdefg",
expected: [][]int64{{97, 98, 99, 100}, {99, 100, 101, 102}, {101, 102, 103, 0}},
seen: 2,
},
}
for _, tt := range tests {
t.Run(
fmt.Sprintf("window%d_stride%d_%v_%v", tt.config.Window, tt.config.Stride, tt.config.PadLeft, tt.config.PadRight),
func(t *testing.T) {
tb := NewTokenBuffer(byteTokenizer{}, tt.config)
tb.SetIncludeTail(true)
var got [][]int64
for w := range tb.Push(0, tt.text) {
got = append(got, w.Tokens)
}
tail, _ := tb.Tail()
gotSeen := tail.Seen
if tt.config.PadLeft {
gotSeen += tail.PaddingLeft
}
if gotSeen != tt.seen {
t.Fatalf("expected seen %d but got %d", tt.seen, gotSeen)
}
got = append(got, tail.Tokens)
if len(got) != len(tt.expected) {
t.Fatalf("expected %d windows but got %d", len(tt.expected), len(got))
}
for i := range got {
if !slices.Equal(got[i], tt.expected[i]) {
t.Errorf("window %d: expected %v but got %v", i, tt.expected[i], got[i])
}
}
},
)
}
}
|
