code: function LDA(...classes) {
  	// Compute pairwise LDA classes (needed for multiclass LDA)
  	if(classes.length < 2) {
  		throw new Error('Please pass at least 2 classes');
  	}
  
  	let numberOfPairs = classes.length * (classes.length - 1) / 2;
  	let pair1 = 0;
  	let pair2 = 1;
  
  	let pairs = new Array(numberOfPairs);
  
  	for(let i = 0; i < numberOfPairs; i++){
  		pairs[i] = computeLdaParams(classes[pair1], classes[pair2], pair1, pair2);
  
  		pair2++;
  		if(pair2 == classes.length) {
  			pair1++;
  			pair2 = pair1 + 1;
  		}
  	} 
  
  	this.pairs = pairs;
  	this.numberOfClasses = classes.length;
  }
docs: An LDA object.
  @constructor
  @param {...number[][]} classes - Each parameter is a 2d class array. In each class array, rows are samples, columns are variables.
  @example
  let classifier = new LDA(class1, class2, class3);