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111 lines
3.9 KiB
Go
111 lines
3.9 KiB
Go
package utils
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import (
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"chat/globals"
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"fmt"
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"strings"
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"github.com/pkoukk/tiktoken-go"
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)
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// Using https://github.com/pkoukk/tiktoken-go
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// To count number of tokens of openai chat messages
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// OpenAI Cookbook: https://github.com/openai/openai-cookbook/blob/main/examples/How_to_count_tokens_with_tiktoken.ipynb
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func GetWeightByModel(model string) int {
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switch model {
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case globals.GPT3TurboInstruct,
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globals.Claude1, globals.Claude1100k,
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globals.Claude2, globals.Claude2100k, globals.Claude2200k:
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return 2
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case globals.GPT3Turbo, globals.GPT3Turbo0613, globals.GPT3Turbo1106, globals.GPT3Turbo0125,
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globals.GPT3Turbo16k, globals.GPT3Turbo16k0613,
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globals.GPT4, globals.GPT40314, globals.GPT40613,
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globals.GPT41106Preview, globals.GPT4TurboPreview, globals.GPT40125Preview,
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globals.GPT4VisionPreview, globals.GPT41106VisionPreview,
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globals.GPT432k, globals.GPT432k0613, globals.GPT432k0314:
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return 3
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case globals.GPT3Turbo0301, globals.GPT3Turbo16k0301:
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return 4 // every message follows <|start|>{role/name}\n{content}<|end|>\n
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default:
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if strings.Contains(model, globals.GPT3Turbo) {
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// warning: gpt-3.5-turbo may update over time. Returning num tokens assuming gpt-3.5-turbo-0613.
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return GetWeightByModel(globals.GPT3Turbo0613)
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} else if strings.Contains(model, globals.GPT4) {
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// warning: gpt-4 may update over time. Returning num tokens assuming gpt-4-0613.
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return GetWeightByModel(globals.GPT40613)
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} else if strings.Contains(model, globals.Claude1) {
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// warning: claude-1 may update over time. Returning num tokens assuming claude-1-100k.
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return GetWeightByModel(globals.Claude1100k)
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} else if strings.Contains(model, globals.Claude2) {
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// warning: claude-2 may update over time. Returning num tokens assuming claude-2-100k.
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return GetWeightByModel(globals.Claude2100k)
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} else {
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// not implemented: See https://github.com/openai/openai-python/blob/main/chatml.md for information on how messages are converted to tokens
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return 3
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}
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}
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}
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func NumTokensFromMessages(messages []globals.Message, model string, responseType bool) (tokens int) {
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tokensPerMessage := GetWeightByModel(model)
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tkm, err := tiktoken.EncodingForModel(model)
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if err != nil {
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// the method above was deprecated, use the recall method instead
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// can not encode messages, use length of messages as a proxy for number of tokens
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// using rune instead of byte to account for unicode characters (e.g. emojis, non-english characters)
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// data := Marshal(messages)
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// return len([]rune(data)) * weight
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// use the recall method instead (default encoder model is gpt-3.5-turbo-0613)
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if globals.DebugMode {
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globals.Debug(fmt.Sprintf("[tiktoken] error encoding messages: %s (model: %s), using default model instead", err, model))
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}
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return NumTokensFromMessages(messages, globals.GPT3Turbo0613, responseType)
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}
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for _, message := range messages {
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tokens += len(tkm.Encode(message.Content, nil, nil))
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if !responseType {
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tokens += len(tkm.Encode(message.Role, nil, nil)) + tokensPerMessage
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}
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}
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if !responseType {
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tokens += 3 // every reply is primed with <|start|>assistant<|message|>
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}
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if globals.DebugMode {
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globals.Debug(fmt.Sprintf("[tiktoken] num tokens from messages: %d (tokens per message: %d, model: %s)", tokens, tokensPerMessage, model))
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}
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return tokens
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}
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func NumTokensFromResponse(response string, model string) int {
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if len(response) == 0 {
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return 0
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}
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return NumTokensFromMessages([]globals.Message{{Content: response}}, model, true)
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}
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func CountInputQuota(charge Charge, token int) float32 {
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if charge.GetType() == globals.TokenBilling {
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return float32(token) / 1000 * charge.GetInput()
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}
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return 0
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}
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func CountOutputToken(charge Charge, token int) float32 {
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switch charge.GetType() {
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case globals.TokenBilling:
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return float32(token) / 1000 * charge.GetOutput()
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case globals.TimesBilling:
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return charge.GetOutput()
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default:
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return 0
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}
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}
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