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package edu.isi.nlp;

/**
 * An {@link Accumulator} which can accumulate fractionally (e.g. add half an item).
 *
 * @param 
 */
public interface ScalableAccumulator extends Accumulator {
  /** Adds the provided data to the accumulator, scaled by the provided factor. */
  void accumulate(T data, double factor);

  /**
   * Adds all the data previously accumulated to the provided accumulator to this one, scaled by the
   * provided factor.
   *
   * @param accumulator
   */
  void accumulate(Accumulator accumulator, double factor);
}