mirror of
https://github.com/linux-do/new-api.git
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259 lines
7.4 KiB
Go
259 lines
7.4 KiB
Go
package service
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import (
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"encoding/json"
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"errors"
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"fmt"
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"github.com/linux-do/tiktoken-go"
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"image"
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"log"
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"math"
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"one-api/common"
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"one-api/dto"
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"strings"
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"unicode/utf8"
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)
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// tokenEncoderMap won't grow after initialization
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var tokenEncoderMap = map[string]*tiktoken.Tiktoken{}
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var defaultTokenEncoder *tiktoken.Tiktoken
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func InitTokenEncoders() {
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common.SysLog("initializing token encoders")
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gpt35TokenEncoder, err := tiktoken.EncodingForModel("gpt-3.5-turbo")
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if err != nil {
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common.FatalLog(fmt.Sprintf("failed to get gpt-3.5-turbo token encoder: %s", err.Error()))
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}
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defaultTokenEncoder = gpt35TokenEncoder
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gpt4TokenEncoder, err := tiktoken.EncodingForModel("gpt-4")
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gpt4oTokenEncoder, err := tiktoken.EncodingForModel("gpt-4o")
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if err != nil {
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common.FatalLog(fmt.Sprintf("failed to get gpt-4 token encoder: %s", err.Error()))
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}
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for model, _ := range common.DefaultModelRatio {
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if strings.HasPrefix(model, "gpt-3.5") {
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tokenEncoderMap[model] = gpt35TokenEncoder
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} else if strings.HasPrefix(model, "gpt-4") {
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if strings.HasPrefix(model, "gpt-4o") {
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tokenEncoderMap[model] = gpt4oTokenEncoder
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} else {
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tokenEncoderMap[model] = gpt4TokenEncoder
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}
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} else {
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tokenEncoderMap[model] = nil
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}
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}
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common.SysLog("token encoders initialized")
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}
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func getTokenEncoder(model string) *tiktoken.Tiktoken {
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tokenEncoder, ok := tokenEncoderMap[model]
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if ok && tokenEncoder != nil {
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return tokenEncoder
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}
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if ok {
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tokenEncoder, err := tiktoken.EncodingForModel(model)
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if err != nil {
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common.SysError(fmt.Sprintf("failed to get token encoder for model %s: %s, using encoder for gpt-3.5-turbo", model, err.Error()))
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tokenEncoder = defaultTokenEncoder
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}
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tokenEncoderMap[model] = tokenEncoder
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return tokenEncoder
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}
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return defaultTokenEncoder
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}
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func getTokenNum(tokenEncoder *tiktoken.Tiktoken, text string) int {
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return len(tokenEncoder.Encode(text, nil, nil))
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}
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func getImageToken(imageUrl *dto.MessageImageUrl, model string, stream bool) (int, error) {
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// TODO: 非流模式下不计算图片token数量
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if model == "glm-4v" {
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return 1047, nil
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}
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if imageUrl.Detail == "low" {
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return 85, nil
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}
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var config image.Config
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var err error
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var format string
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if strings.HasPrefix(imageUrl.Url, "http") {
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common.SysLog(fmt.Sprintf("downloading image: %s", imageUrl.Url))
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config, format, err = common.DecodeUrlImageData(imageUrl.Url)
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} else {
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common.SysLog(fmt.Sprintf("decoding image"))
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config, format, _, err = common.DecodeBase64ImageData(imageUrl.Url)
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}
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if err != nil {
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return 0, err
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}
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if config.Width == 0 || config.Height == 0 {
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return 0, errors.New(fmt.Sprintf("fail to decode image config: %s", imageUrl.Url))
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}
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// TODO: 适配官方auto计费
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if config.Width < 512 && config.Height < 512 {
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if imageUrl.Detail == "auto" || imageUrl.Detail == "" {
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// 如果图片尺寸小于512，强制使用low
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imageUrl.Detail = "low"
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return 85, nil
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}
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}
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shortSide := config.Width
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otherSide := config.Height
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log.Printf("format: %s, width: %d, height: %d", format, config.Width, config.Height)
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// 缩放倍数
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scale := 1.0
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if config.Height < shortSide {
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shortSide = config.Height
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otherSide = config.Width
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}
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// 将最小变的尺寸缩小到768以下，如果大于768，则缩放到768
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if shortSide > 768 {
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scale = float64(shortSide) / 768
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shortSide = 768
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}
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// 将另一边按照相同的比例缩小，向上取整
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otherSide = int(math.Ceil(float64(otherSide) / scale))
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log.Printf("shortSide: %d, otherSide: %d, scale: %f", shortSide, otherSide, scale)
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// 计算图片的token数量(边的长度除以512，向上取整)
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tiles := (shortSide + 511) / 512 * ((otherSide + 511) / 512)
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log.Printf("tiles: %d", tiles)
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return tiles*170 + 85, nil
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}
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func CountTokenChatRequest(request dto.GeneralOpenAIRequest, model string) (int, error) {
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tkm := 0
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msgTokens, err := CountTokenMessages(request.Messages, model, request.Stream)
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if err != nil {
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return 0, err
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}
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tkm += msgTokens
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if request.Tools != nil {
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toolsData, _ := json.Marshal(request.Tools)
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var openaiTools []dto.OpenAITools
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err := json.Unmarshal(toolsData, &openaiTools)
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if err != nil {
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return 0, errors.New(fmt.Sprintf("count_tools_token_fail: %s", err.Error()))
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}
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countStr := ""
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for _, tool := range openaiTools {
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countStr = tool.Function.Name
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if tool.Function.Description != "" {
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countStr += tool.Function.Description
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}
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if tool.Function.Parameters != nil {
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countStr += fmt.Sprintf("%v", tool.Function.Parameters)
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}
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}
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toolTokens, err := CountTokenInput(countStr, model)
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if err != nil {
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return 0, err
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}
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tkm += 8
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tkm += toolTokens
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}
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return tkm, nil
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}
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func CountTokenMessages(messages []dto.Message, model string, stream bool) (int, error) {
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//recover when panic
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tokenEncoder := getTokenEncoder(model)
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// Reference:
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// https://github.com/openai/openai-cookbook/blob/main/examples/How_to_count_tokens_with_tiktoken.ipynb
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// https://github.com/pkoukk/tiktoken-go/issues/6
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//
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// Every message follows <|start|>{role/name}\n{content}<|end|>\n
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var tokensPerMessage int
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var tokensPerName int
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if model == "gpt-3.5-turbo-0301" {
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tokensPerMessage = 4
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tokensPerName = -1 // If there's a name, the role is omitted
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} else {
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tokensPerMessage = 3
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tokensPerName = 1
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}
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tokenNum := 0
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for _, message := range messages {
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tokenNum += tokensPerMessage
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tokenNum += getTokenNum(tokenEncoder, message.Role)
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if len(message.Content) > 0 {
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if message.IsStringContent() {
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stringContent := message.StringContent()
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tokenNum += getTokenNum(tokenEncoder, stringContent)
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if message.Name != nil {
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tokenNum += tokensPerName
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tokenNum += getTokenNum(tokenEncoder, *message.Name)
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}
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} else {
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arrayContent := message.ParseContent()
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for _, m := range arrayContent {
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if m.Type == "image_url" {
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imageUrl := m.ImageUrl.(dto.MessageImageUrl)
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imageTokenNum, err := getImageToken(&imageUrl, model, stream)
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if err != nil {
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return 0, err
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}
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tokenNum += imageTokenNum
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log.Printf("image token num: %d", imageTokenNum)
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} else {
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tokenNum += getTokenNum(tokenEncoder, m.Text)
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}
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}
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}
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}
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}
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tokenNum += 3 // Every reply is primed with <|start|>assistant<|message|>
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return tokenNum, nil
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}
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func CountTokenInput(input any, model string) (int, error) {
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switch v := input.(type) {
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case string:
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return CountTokenText(v, model)
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case []string:
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text := ""
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for _, s := range v {
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text += s
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}
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return CountTokenText(text, model)
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}
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return CountTokenInput(fmt.Sprintf("%v", input), model)
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}
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func CountTokenStreamChoices(messages []dto.ChatCompletionsStreamResponseChoice, model string) int {
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tokens := 0
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for _, message := range messages {
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tkm, _ := CountTokenInput(message.Delta.GetContentString(), model)
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tokens += tkm
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if message.Delta.ToolCalls != nil {
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for _, tool := range message.Delta.ToolCalls {
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tkm, _ := CountTokenInput(tool.Function.Name, model)
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tokens += tkm
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tkm, _ = CountTokenInput(tool.Function.Arguments, model)
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tokens += tkm
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}
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}
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}
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return tokens
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}
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func CountAudioToken(text string, model string) (int, error) {
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if strings.HasPrefix(model, "tts") {
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return utf8.RuneCountInString(text), nil
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} else {
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return CountTokenText(text, model)
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}
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}
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// CountTokenText 统计文本的token数量，仅当文本包含敏感词，返回错误，同时返回token数量
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func CountTokenText(text string, model string) (int, error) {
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var err error
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tokenEncoder := getTokenEncoder(model)
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return getTokenNum(tokenEncoder, text), err
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}
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