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109 changes: 109 additions & 0 deletions
109
src/main/java/com/meta/cp4m/llm/HuggingFaceLlamaPrompt.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| /* | ||
| * | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
|
|
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| package com.meta.cp4m.llm; | ||
|
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| import ai.djl.huggingface.tokenizers.Encoding; | ||
| import ai.djl.huggingface.tokenizers.HuggingFaceTokenizer; | ||
| import com.meta.cp4m.message.Message; | ||
| import com.meta.cp4m.message.ThreadState; | ||
|
|
||
| import java.io.IOException; | ||
| import java.net.URI; | ||
| import java.net.URISyntaxException; | ||
| import java.net.URL; | ||
| import java.nio.file.Paths; | ||
| import java.util.*; | ||
|
|
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| public class HuggingFaceLlamaPrompt<T extends Message> { | ||
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| private final String systemMessage; | ||
| private final long maxInputTokens; | ||
| private final HuggingFaceTokenizer tokenizer; | ||
|
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| public HuggingFaceLlamaPrompt(String systemMessage, long maxInputTokens) { | ||
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| this.systemMessage = systemMessage; | ||
| this.maxInputTokens = maxInputTokens; | ||
| URL llamaTokenizerUrl = | ||
| Objects.requireNonNull( | ||
| HuggingFaceLlamaPrompt.class.getClassLoader().getResource("llamaTokenizer.json")); | ||
| URI llamaTokenizer; | ||
| try { | ||
| llamaTokenizer = llamaTokenizerUrl.toURI(); | ||
| tokenizer = HuggingFaceTokenizer.newInstance(Paths.get(llamaTokenizer)); | ||
|
|
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| } catch (URISyntaxException | IOException e) { | ||
| // this should be impossible | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| public Optional<String> createPrompt(ThreadState<T> threadState) { | ||
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| PromptBuilder builder = new PromptBuilder(); | ||
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| int totalTokens = tokenCount(this.systemMessage) + 5; // Account for closing tokens | ||
| builder.addSystem(this.systemMessage); | ||
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| for (int i = threadState.messages().size() - 1; i >= 0; i--) { | ||
| Message m = threadState.messages().get(i); | ||
| totalTokens += tokenCount(m.message()); | ||
| if (totalTokens > maxInputTokens) { | ||
| if (i == threadState.messages().size() - 1){ | ||
| return Optional.empty(); | ||
| } | ||
| break; | ||
| } | ||
| switch (m.role()) { | ||
| case USER -> builder.addUser(m.message()); | ||
| case ASSISTANT -> builder.addAssistant(m.message()); | ||
| } | ||
| } | ||
|
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| return Optional.of(builder.build()); | ||
| } | ||
|
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| private int tokenCount(String message) { | ||
| Encoding encoding = tokenizer.encode(message); | ||
| return encoding.getTokens().length; | ||
| } | ||
|
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| private static class PromptBuilder { | ||
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| StringBuilder promptStringBuilder = new StringBuilder(); | ||
| StringBuilder messagesStringBuilder = new StringBuilder(); | ||
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| void addSystem(String message) { | ||
| promptStringBuilder | ||
| .append("<s>[INST] <<SYS>>\n") | ||
| .append(message) | ||
| .append("\n<</SYS>>\n\n"); | ||
| } | ||
|
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| void addAssistant(String message) { | ||
| StringBuilder tempBuilder = new StringBuilder(); | ||
| tempBuilder | ||
| .append(message) | ||
| .append(" </s><s>[INST] "); | ||
| messagesStringBuilder.append(tempBuilder.reverse()); | ||
| } | ||
|
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| void addUser(String message) { | ||
| StringBuilder tempBuilder = new StringBuilder(); | ||
| tempBuilder | ||
| .append(message) | ||
| .append(" [/INST] "); | ||
| messagesStringBuilder.append(tempBuilder.reverse()); | ||
| } | ||
|
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| String build() { | ||
| return promptStringBuilder.append(messagesStringBuilder.reverse()).toString().strip(); | ||
| } | ||
| } | ||
| } |
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