docs: function trainRandomForest(data, labels, options) {
      options = options || {};
      this.numTrees = options.numTrees || 100;
        
      // initialize many trees and train them all independently
      this.trees= new Array(this.numTrees);
      for(var i=0;i<this.numTrees;i++) {
          this.trees[i] = new DecisionTree();
          this.trees[i].train(data, labels, options);
      }
  }