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llmSelectors.ts
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llmSelectors.ts
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import type { LLM } from "../llm/index.js";
import type { Answer } from "../outputParsers/selectors.js";
import { SelectionOutputParser } from "../outputParsers/selectors.js";
import type {
BaseOutputParser,
QueryBundle,
StructuredOutput,
ToolMetadataOnlyDescription,
} from "../types.js";
import type { SelectorResult } from "./base.js";
import { BaseSelector } from "./base.js";
import type { MultiSelectPrompt, SingleSelectPrompt } from "./prompts.js";
import {
defaultMultiSelectPrompt,
defaultSingleSelectPrompt,
} from "./prompts.js";
function buildChoicesText(choices: ToolMetadataOnlyDescription[]): string {
const texts: string[] = [];
for (const [ind, choice] of choices.entries()) {
let text = choice.description.split("\n").join(" ");
text = `(${ind + 1}) ${text}`; // to one indexing
texts.push(text);
}
return texts.join("");
}
function structuredOutputToSelectorResult(
output: StructuredOutput<Answer[]>,
): SelectorResult {
const structuredOutput = output;
const answers = structuredOutput.parsedOutput;
// adjust for zero indexing
const selections = answers.map((answer: any) => {
return { index: answer.choice - 1, reason: answer.reason };
});
return { selections };
}
type LLMPredictorType = LLM;
/**
* A selector that uses the LLM to select a single or multiple choices from a list of choices.
*/
export class LLMMultiSelector extends BaseSelector {
llm: LLMPredictorType;
prompt: MultiSelectPrompt;
maxOutputs: number;
outputParser: BaseOutputParser<StructuredOutput<Answer[]>>;
constructor(init: {
llm: LLMPredictorType;
prompt?: MultiSelectPrompt;
maxOutputs?: number;
outputParser?: BaseOutputParser<StructuredOutput<Answer[]>>;
}) {
super();
this.llm = init.llm;
this.prompt = init.prompt ?? defaultMultiSelectPrompt;
this.maxOutputs = init.maxOutputs ?? 10;
this.outputParser = init.outputParser ?? new SelectionOutputParser();
}
_getPrompts(): Record<string, MultiSelectPrompt> {
return { prompt: this.prompt };
}
_updatePrompts(prompts: Record<string, MultiSelectPrompt>): void {
if ("prompt" in prompts) {
this.prompt = prompts.prompt;
}
}
/**
* Selects a single choice from a list of choices.
* @param choices
* @param query
*/
async _select(
choices: ToolMetadataOnlyDescription[],
query: QueryBundle,
): Promise<SelectorResult> {
const choicesText = buildChoicesText(choices);
const prompt = this.prompt(
choicesText.length,
choicesText,
query.queryStr,
this.maxOutputs,
);
const formattedPrompt = this.outputParser?.format(prompt);
const prediction = await this.llm.complete({
prompt: formattedPrompt,
});
const parsed = this.outputParser?.parse(prediction.text);
if (!parsed) {
throw new Error("Parsed output is undefined");
}
return structuredOutputToSelectorResult(parsed);
}
asQueryComponent(): unknown {
throw new Error("Method not implemented.");
}
}
/**
* A selector that uses the LLM to select a single choice from a list of choices.
*/
export class LLMSingleSelector extends BaseSelector {
llm: LLMPredictorType;
prompt: SingleSelectPrompt;
outputParser: BaseOutputParser<StructuredOutput<Answer[]>>;
constructor(init: {
llm: LLMPredictorType;
prompt?: SingleSelectPrompt;
outputParser?: BaseOutputParser<StructuredOutput<Answer[]>>;
}) {
super();
this.llm = init.llm;
this.prompt = init.prompt ?? defaultSingleSelectPrompt;
this.outputParser = init.outputParser ?? new SelectionOutputParser();
}
_getPrompts(): Record<string, SingleSelectPrompt> {
return { prompt: this.prompt };
}
_updatePrompts(prompts: Record<string, SingleSelectPrompt>): void {
if ("prompt" in prompts) {
this.prompt = prompts.prompt;
}
}
/**
* Selects a single choice from a list of choices.
* @param choices
* @param query
*/
async _select(
choices: ToolMetadataOnlyDescription[],
query: QueryBundle,
): Promise<SelectorResult> {
const choicesText = buildChoicesText(choices);
const prompt = this.prompt(choicesText.length, choicesText, query.queryStr);
const formattedPrompt = this.outputParser.format(prompt);
const prediction = await this.llm.complete({
prompt: formattedPrompt,
});
const parsed = this.outputParser?.parse(prediction.text);
if (!parsed) {
throw new Error("Parsed output is undefined");
}
return structuredOutputToSelectorResult(parsed);
}
asQueryComponent(): unknown {
throw new Error("Method not implemented.");
}
}