export interface Sample {
  data: Float32Array;
  label: number[];
}

export function flatOneHot(label: number, numClasses: number) {
  const labelOneHot = new Array(numClasses).fill(0) as number[];
  labelOneHot[label] = 1;

  return labelOneHot;
}

export function fisherYates(array: Float32Array[] | Sample[]) {
  const length = array.length;

  // need to clone array or we'd be editing original as we goo
  const shuffled = array.slice();
  for (let i = (length - 1); i > 0; i -= 1) {
    let randomIndex ;
    randomIndex = Math.floor(Math.random() * (i + 1));
    [shuffled[i], shuffled[randomIndex]] = [shuffled[randomIndex],shuffled[i]];
  }
  return shuffled;
}