import { TEXT_EMBEDDING_MODELS } from "$env/static/private"; import { z } from "zod"; import { sum } from "$lib/utils/sum"; import { embeddingEndpoints, embeddingEndpointSchema, type EmbeddingEndpoint, } from "$lib/server/embeddingEndpoints/embeddingEndpoints"; import { embeddingEndpointTransformersJS } from "$lib/server/embeddingEndpoints/transformersjs/embeddingEndpoints"; const modelConfig = z.object({ /** Used as an identifier in DB */ id: z.string().optional(), /** Used to link to the model page, and for inference */ name: z.string().min(1), displayName: z.string().min(1).optional(), description: z.string().min(1).optional(), websiteUrl: z.string().url().optional(), modelUrl: z.string().url().optional(), endpoints: z.array(embeddingEndpointSchema).nonempty(), chunkCharLength: z.number().positive(), preQuery: z.string().default(""), prePassage: z.string().default(""), }); // Default embedding model for backward compatibility const rawEmbeddingModelJSON = TEXT_EMBEDDING_MODELS || `[ { "name": "Xenova/gte-small", "chunkCharLength": 512, "endpoints": [ { "type": "transformersjs" } ] } ]`; const embeddingModelsRaw = z.array(modelConfig).parse(JSON.parse(rawEmbeddingModelJSON)); const processEmbeddingModel = async (m: z.infer) => ({ ...m, id: m.id || m.name, }); const addEndpoint = (m: Awaited>) => ({ ...m, getEndpoint: async (): Promise => { if (!m.endpoints) { return embeddingEndpointTransformersJS({ type: "transformersjs", weight: 1, model: m, }); } const totalWeight = sum(m.endpoints.map((e) => e.weight)); let random = Math.random() * totalWeight; for (const endpoint of m.endpoints) { if (random < endpoint.weight) { const args = { ...endpoint, model: m }; switch (args.type) { case "tei": return embeddingEndpoints.tei(args); case "transformersjs": return embeddingEndpoints.transformersjs(args); } } random -= endpoint.weight; } throw new Error(`Failed to select embedding endpoint`); }, }); export const embeddingModels = await Promise.all( embeddingModelsRaw.map((e) => processEmbeddingModel(e).then(addEndpoint)) ); export const defaultEmbeddingModel = embeddingModels[0]; const validateEmbeddingModel = (_models: EmbeddingBackendModel[], key: "id" | "name") => { return z.enum([_models[0][key], ..._models.slice(1).map((m) => m[key])]); }; export const validateEmbeddingModelById = (_models: EmbeddingBackendModel[]) => { return validateEmbeddingModel(_models, "id"); }; export const validateEmbeddingModelByName = (_models: EmbeddingBackendModel[]) => { return validateEmbeddingModel(_models, "name"); }; export type EmbeddingBackendModel = typeof defaultEmbeddingModel;