training - brain.js

net.train(inputs, { 
    log: true, // prints to the screen the error rate, and current iteration
    errorThresh: 0.05, // a relatively high error margin - but I'm not shooting for 100% accuracy (and it's merely a test)
})

var testFileContent = fs.readFileSync(testFile) // read the entire sample file into memory
var output = net.run(testFileContent) // and then run it! This will predict the class for the testFile
console.log(output)

// output: 
// [ business: 0.0043, tech: 0.8552]