run.comment-analysis.js

function run() {
    Promise.all([
        encodeData(comments),
        encodeData(comment_testing)
    ])
    .then(data => {
        const {
            0: training_data,
            1: testing_data,
        } = data;

        model.fit(training_data, outputData, { epochs: 200 })
            .then(history => {
                model.predict(testing_data).print();
            });
    })
    .catch(err => console.log('Prom Err:', err));
};

// Call function
run();

Nice article. Can I suggest const [training_data, testing_data] = data?