anything-llm/server/utils/EmbeddingEngines/native/index.js

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const path = require("path");
const fs = require("fs");
const { toChunks } = require("../../helpers");
class NativeEmbedder {
constructor() {
// Model Card: https://huggingface.co/sentence-transformers/all-MiniLM-L6-v2
this.model = "Xenova/all-MiniLM-L6-v2";
this.cacheDir = path.resolve(
process.env.STORAGE_DIR
? path.resolve(process.env.STORAGE_DIR, `models`)
: path.resolve(__dirname, `../../../storage/models`)
);
this.modelPath = path.resolve(this.cacheDir, "Xenova", "all-MiniLM-L6-v2");
// Limit of how many strings we can process in a single pass to stay with resource or network limits
this.maxConcurrentChunks = 50;
this.embeddingMaxChunkLength = 1_000;
// Make directory when it does not exist in existing installations
if (!fs.existsSync(this.cacheDir)) fs.mkdirSync(this.cacheDir);
}
async embedderClient() {
if (!fs.existsSync(this.modelPath)) {
console.log(
"\x1b[34m[INFO]\x1b[0m The native embedding model has never been run and will be downloaded right now. Subsequent runs will be faster. (~23MB)\n\n"
);
}
try {
// Convert ESM to CommonJS via import so we can load this library.
const pipeline = (...args) =>
import("@xenova/transformers").then(({ pipeline }) =>
pipeline(...args)
);
return await pipeline("feature-extraction", this.model, {
cache_dir: this.cacheDir,
...(!fs.existsSync(this.modelPath)
? {
// Show download progress if we need to download any files
progress_callback: (data) => {
if (!data.hasOwnProperty("progress")) return;
console.log(
`\x1b[34m[Embedding - Downloading Model Files]\x1b[0m ${
data.file
} ${~~data?.progress}%`
);
},
}
: {}),
});
} catch (error) {
console.error("Failed to load the native embedding model:", error);
throw error;
}
}
async embedTextInput(textInput) {
const result = await this.embedChunks(textInput);
return result?.[0] || [];
}
async embedChunks(textChunks = []) {
const Embedder = await this.embedderClient();
const embeddingResults = [];
for (const chunk of toChunks(textChunks, this.maxConcurrentChunks)) {
const output = await Embedder(chunk, {
pooling: "mean",
normalize: true,
});
if (output.length === 0) continue;
embeddingResults.push(output.tolist());
}
return embeddingResults.length > 0 ? embeddingResults.flat() : null;
}
}
module.exports = {
NativeEmbedder,
};