generate-csv.js

const createCsvWriter = require('csv-writer').createObjectCsvWriter;
const csvWriter = createCsvWriter({
  path: './vectors.csv',
  header: [
    { id: 'vector', title: 'vector' },
  ]
});

const records = [];

const generateVector = (dimension) => {
  let index = 0
  let vectors = []
  while (index < dimension) {
    vectors.push(1 + Math.random())
    index++
  }
  return JSON.stringify(vectors)
}
while (records.length < 20000) {
  let value = generateVector(4)
  records.push({ vector: value })
}

csvWriter.writeRecords(records)       // returns a promise
  .then(() => {
    console.log('...Done');
  });