code: function initNodeCpt(values, parents, probs) {
      var cpt = initCptWithParents(values, parents, 0);
      setNodeCptProbs(cpt, probs, 0);
      return cpt;
    }
docs: Initializes a node's CPT.
  @param {Array} values Array of values.
  @param {Array} parents Array of parents.
  @param {Array} probs Array of arrays of probabilities.
  @returns {Array} Array of nested arrays representing a CPT.