function findPivots(dataSet, sampleSet, remainderSet) {
  var distance = calculateDistancePoker;
  // Initialize

  var numBuckets = Math.floor(Math.sqrt(sampleSet.length)),
    numPivots = Math.floor(Math.sqrt(sampleSet.length)),
    parents = [],
    maxDists = [],
    bucketWidths = [],                                                                                                                                      
    pivotsBuckets = [];

  var pivots = createRandomSample(dataSet, sampleSet.length, numPivots);

  for (var i = 0; i < numPivots; i++) {
    pivotsBuckets[i] = [];
    for (var j = 0; j < numBuckets; j++) {
      pivotsBuckets[i][j] = [];
    }
  }

  // Pre-processing
  var fullDists = []
  for (var i = 0; i < sampleSet.length; i++) {
    fullDists[i] = [];
  }

  for (var j = 0, maxDist = -1; j < numPivots; j++) {
    var c1 = pivots[j];
    for (var i = 0; i < sampleSet.length; i++) {
      var c2 = sampleSet[i];
      if (c1 !== c2) {
        var dist = distance(c1, c2);
        // console.log(dist, c1, c2);
        if (dist > maxDist) {
          maxDist = dist;
        }
        fullDists[i][j] = dist;
      } else {
        fullDists[i][j] = 0.0001;
      }
    }
    maxDists.push(maxDist);
    bucketWidths.push(maxDist / numBuckets);
  }

  // console.log(fullDists);

  for (var j = 0; j < numPivots; j++) {
    var bucketWidth = bucketWidths[j];
    for (var i = 0; i < sampleSet.length; i++) {
      var tmp = pivotsBuckets[j][Math.floor((fullDists[i][j] - 0.0001) / bucketWidth)];
      // pivotsBuckets[j][Math.floor((fullDists[i][j] - 0.0001) / bucketWidth)].push(sampleSet[i]);
      // console.log(tmp, i, j, bucketWidth, Math.floor((fullDists[i][j] - 0.0001) / bucketWidth));
      tmp.push(sampleSet[i]);
    }
  }

  // Find parents
  for (var r = 0, bNum, minIndex; r < remainderSet.length; r++) {
    var node = remainderSet[r];
    var clDist = Number.MAX_VALUE;
    for (var p = 0; p < numPivots; p++) {
      var comp = pivots[p];
      var bucketWidth = bucketWidths[p];
      if (node !== comp) {
        var dist = distance(node, comp);
        bNum = Math.floor((dist - 0.0001) / bucketWidth);
        if (bNum >= numBuckets) {
          bNum = numBuckets - 1;
        } else if (bNum < 0) {
          bNum = 0;
        }
        var bucketContents = pivotsBuckets[p][bNum];
        for (var w = 0; w < bucketContents.length; w++) {
          var c1 = bucketContents[w];
          if (c1 != node) {
            dist = distance(c1, node);
            if (dist <= clDist) {
              clDist = dist;
              minIndex = bucketContents[w];
            }
          }
        }
      }
    }
    parents.push(minIndex);
  }
  return parents;
}

function createRandomSample(nodes, max, size) {
  var randElements = [];

  for (var i = 0; i < size; ++i) {
    // Stop when no new elements can be found.
    if (randElements.size >= nodes.length) {
      break;
    }
    var rand = Math.floor((Math.random() * max));
    // If the rand is already in random list or in exclude list
    // ignore it and get a new value.
    while (randElements.includes(rand)) {
      rand = Math.floor((Math.random() * max));
    }
    randElements.push(nodes[rand]);
  }

  return randElements;
}