samoa-api/src/main/java/org/apache/samoa/moa/classifiers/AbstractClassifier.java [312:366]:
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          return false; // rule 3
        }
      } else {
        assert (originalContext.attribute(oPos).isNumeric());
        if (!newContext.attribute(nPos).isNumeric()) {
          return false; // rule 4
        }
      }
      oPos++;
      nPos++;
    }
    return true; // all checks clear
  }

  /**
   * Resets this classifier. It must be similar to starting a new classifier from scratch. <br>
   * <br>
   * 
   * The reason for ...Impl methods: ease programmer burden by not requiring them to remember calls to super in
   * overridden methods. Note that this will produce compiler errors if not overridden.
   */
  public abstract void resetLearningImpl();

  /**
   * Trains this classifier incrementally using the given instance.<br>
   * <br>
   * 
   * The reason for ...Impl methods: ease programmer burden by not requiring them to remember calls to super in
   * overridden methods. Note that this will produce compiler errors if not overridden.
   * 
   * @param inst
   *          the instance to be used for training
   */
  public abstract void trainOnInstanceImpl(Instance inst);

  /**
   * Gets the current measurements of this classifier.<br>
   * <br>
   * 
   * The reason for ...Impl methods: ease programmer burden by not requiring them to remember calls to super in
   * overridden methods. Note that this will produce compiler errors if not overridden.
   * 
   * @return an array of measurements to be used in evaluation tasks
   */
  protected abstract Measurement[] getModelMeasurementsImpl();

  /**
   * Returns a string representation of the model.
   * 
   * @param out
   *          the stringbuilder to add the description
   * @param indent
   *          the number of characters to indent
   */
  public abstract void getModelDescription(StringBuilder out, int indent);
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samoa-api/src/main/java/org/apache/samoa/moa/clusterers/AbstractClusterer.java [248:272]:
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          return false; // rule 3
        }
      } else {
        assert (originalContext.attribute(oPos).isNumeric());
        if (!newContext.attribute(nPos).isNumeric()) {
          return false; // rule 4
        }
      }
      oPos++;
      nPos++;
    }
    return true; // all checks clear
  }

  // reason for ...Impl methods:
  // ease programmer burden by not requiring them to remember calls to super
  // in overridden methods & will produce compiler errors if not overridden

  public abstract void resetLearningImpl();

  public abstract void trainOnInstanceImpl(Instance inst);

  protected abstract Measurement[] getModelMeasurementsImpl();

  public abstract void getModelDescription(StringBuilder out, int indent);
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