99 lines
2.6 KiB
JavaScript
99 lines
2.6 KiB
JavaScript
"use strict";
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import path from 'path';
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import fs from 'fs';
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import brain from 'brain.js';
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class AITrainer {
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constructor({ ansi, settings, log, root_dir, GatewayRepo, DatasetFetcher }) {
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this.a = ansi;
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this.settings = settings;
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this.root_dir = root_dir;
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this.l = log;
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this.dataset_fetcher = DatasetFetcher;
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this.repo_gateway = GatewayRepo;
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}
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generate_neural_net() {
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let net = new brain.NeuralNetwork({
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hiddenLayers: this.settings.ai.network_arch,
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activation: "sigmoid"
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});
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return net;
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}
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async train_all() {
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let index = [];
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for(let gateway of this.repo_gateway.iterate()) {
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let filepath = path.join(this.root_dir, "..", this.settings.ai.output_directory, `${gateway.id}.json`);
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console.log(filepath);
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if(!fs.existsSync(path.dirname(filepath)))
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await fs.promises.mkdir(path.dirname(filepath), { recursive: true });
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if(!await this.train_gateway(gateway.id, filepath)) {
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this.l.warn(`Warning: Failed to train AI for ${gateway.id}.`);
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continue;
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}
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index.push({
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id: gateway.id,
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filename: path.basename(filepath),
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latitude: gateway.latitude,
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longitude: gateway.longitude
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});
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}
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await fs.promises.writeFile(
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path.join(
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path.dirname(this.root_dir),
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this.settings.ai.output_directory,
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"index.json"
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),
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JSON.stringify({
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properties: {
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rssi_min: this.settings.ai.rssi_min,
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rssi_max: this.settings.ai.rssi_max
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},
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index
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})
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);
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}
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/**
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* Trains an AI to predict the coverage of a specific gateway.
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* @param {string} gateway_id The id of the gateway to train an AI for.
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* @param {string} destination_filename The absolute path to the file to serialise the trained to. Required because we can't serialise and return a TensorFlow model, it has to be sent somewhere because the API is backwards and upside-down :-/
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* @return {Promise} A promise that resolves when training and serialisation is complete.
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*/
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async train_gateway(gateway_id, destination_filename) {
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this.l.log(`${this.a.fgreen}${this.a.hicol}Training AI for gateway ${gateway_id}${this.a.reset}`);
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let net = this.generate_neural_net();
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let dataset = this.dataset_fetcher.fetch_all(gateway_id);
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await net.trainAsync(dataset, {
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iterations: this.settings.ai.epochs,
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errorThresh: this.settings.ai.error_threshold,
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learningRate: this.settings.ai.learning_rate,
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momentum: this.settings.ai.momentum,
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log: true,
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logPeriod: 50,
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timeout: Infinity
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});
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await fs.promises.writeFile(destination_filename, JSON.stringify(net.toJSON()));
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// console.log(result);
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return true;
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}
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}
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export default AITrainer;
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