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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.llm.client;
import ai.vespa.llm.Completion;
import ai.vespa.llm.LanguageModel;
import ai.vespa.llm.Prompt;
import com.theokanning.openai.OpenAiHttpException;
import com.theokanning.openai.completion.CompletionRequest;
import com.theokanning.openai.service.OpenAiService;
import com.yahoo.api.annotations.Beta;
import com.yahoo.yolean.Exceptions;
import java.util.List;
/**
* A client to the OpenAI language model API. Refer to https://platform.openai.com/docs/api-reference/.
*
* @author bratseth
*/
@Beta
public class OpenAiClient implements LanguageModel {
private final OpenAiService openAiService;
private final String model;
private final boolean echo;
private OpenAiClient(Builder builder) {
openAiService = new OpenAiService(builder.token);
this.model = builder.model;
this.echo = builder.echo;
}
@Override
public List<Completion> complete(Prompt prompt) {
try {
CompletionRequest completionRequest = CompletionRequest.builder()
.prompt(prompt.asString())
.model(model)
.echo(echo)
.build();
return openAiService.createCompletion(completionRequest).getChoices().stream()
.map(c -> new Completion(c.getText(), toFinishReason(c.getFinish_reason()))).toList();
}
catch (OpenAiHttpException e) {
throw new RuntimeException(Exceptions.toMessageString(e));
}
}
private Completion.FinishReason toFinishReason(String finishReasonString) {
return switch(finishReasonString) {
case "length" -> Completion.FinishReason.length;
case "stop" -> Completion.FinishReason.stop;
default -> throw new IllegalStateException("Unknown OpenAi completion finish reason '" + finishReasonString + "'");
};
}
public static class Builder {
private final String token;
private String model = "text-davinci-003";
private boolean echo = false;
public Builder(String token) {
this.token = token;
}
/** One of the language models listed at https://platform.openai.com/docs/models */
public Builder model(String model) {
this.model = model;
return this;
}
public Builder echo(boolean echo) {
this.echo = echo;
return this;
}
public OpenAiClient build() {
return new OpenAiClient(this);
}
}
}
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