66 lines
2.0 KiB
Go
66 lines
2.0 KiB
Go
package controller
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import (
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"fmt"
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"github.com/pkoukk/tiktoken-go"
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"one-api/common"
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"strings"
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)
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var tokenEncoderMap = map[string]*tiktoken.Tiktoken{}
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func getTokenEncoder(model string) *tiktoken.Tiktoken {
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if tokenEncoder, ok := tokenEncoderMap[model]; ok {
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return tokenEncoder
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}
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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, 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 token encoder for model gpt-3.5-turbo: %s", err.Error()))
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}
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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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func countTokenMessages(messages []Message, model string) int {
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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 strings.HasPrefix(model, "gpt-3.5") {
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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 if strings.HasPrefix(model, "gpt-4") {
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tokensPerMessage = 3
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tokensPerName = 1
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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 += len(tokenEncoder.Encode(message.Content, nil, nil))
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tokenNum += len(tokenEncoder.Encode(message.Role, nil, nil))
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if message.Name != nil {
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tokenNum += tokensPerName
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tokenNum += len(tokenEncoder.Encode(*message.Name, nil, nil))
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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
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}
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func countTokenText(text string, model string) int {
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tokenEncoder := getTokenEncoder(model)
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token := tokenEncoder.Encode(text, nil, nil)
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return len(token)
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}
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