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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.llm.search;
import ai.vespa.llm.LanguageModel;
import ai.vespa.llm.LlmSearcherConfig;
import ai.vespa.llm.completion.Prompt;
import ai.vespa.llm.completion.StringPrompt;
import com.yahoo.api.annotations.Beta;
import com.yahoo.component.annotation.Inject;
import com.yahoo.component.provider.ComponentRegistry;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.searchchain.Execution;
import java.util.logging.Logger;
/**
* An LLM searcher that uses the RAG (Retrieval-Augmented Generation) model to generate completions.
* Prompts are generated based on the search result context.
* By default, the context is a concatenation of the fields of the search result hits.
*
* @author lesters
*/
@Beta
public class RAGSearcher extends LLMSearcher {
private static Logger log = Logger.getLogger(RAGSearcher.class.getName());
private static final String CONTEXT_PROPERTY = "context";
@Inject
public RAGSearcher(LlmSearcherConfig config, ComponentRegistry<LanguageModel> languageModels) {
super(config, languageModels);
log.info("Starting " + RAGSearcher.class.getName() + " with language model " + config.providerId());
}
@Override
public Result search(Query query, Execution execution) {
Result result = execution.search(query);
execution.fill(result);
return complete(query, buildPrompt(query, result));
}
protected Prompt buildPrompt(Query query, Result result) {
String prompt = getPrompt(query);
// Replace @query with the actual query
if (prompt.contains("@query")) {
prompt = prompt.replace("@query", query.getModel().getQueryString());
}
String context = lookupProperty(CONTEXT_PROPERTY, query);
if (context == null || !context.equals("skip")) {
if ( !prompt.contains("{context}")) {
prompt = "{context}\n" + prompt;
}
prompt = prompt.replace("{context}", buildContext(result));
}
return StringPrompt.from(prompt);
}
private String buildContext(Result result) {
StringBuilder sb = new StringBuilder();
var hits = result.hits();
hits.forEach(hit -> {
hit.fields().forEach((key, value) -> {
sb.append(key).append(": ").append(value).append("\n");
});
sb.append("\n");
});
var context = sb.toString();
return context;
}
}
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