code: public void reset() {
      isEmpty_ = true;
      count_ = 0;
      theta_ = (long) (Long.MAX_VALUE * (double) samplingProbability_);
      final int startingCapacity = Util.getStartingCapacity(nomEntries_, lgResizeFactor_);
      lgCurrentCapacity_ = Integer.numberOfTrailingZeros(startingCapacity);
      keys_ = new long[startingCapacity];
      summaries_ = null; // wait for the first summary to call Array.newInstance()
      setRebuildThreshold();
    }
docs: Resets this sketch an empty state.