Examples of org.apache.mahout.cf.taste.impl.common.FixedRunningAverageAndStdDev

Package org.apache.mahout.cf.taste.impl.common

Examples of org.apache.mahout.cf.taste.impl.common.FixedRunningAverageAndStdDev

org.apache.mahout.cf.taste.impl.common.FixedRunningAverageAndStdDev

A simple class that represents a fixed value of an average, count and standard deviation. This is useful when an API needs to return {@link RunningAverageAndStdDev} but is not in a position to acceptupdates to it.

      stmt.setLong(2, itemID2);
      stmt.setLong(3, itemID2);
      stmt.setLong(4, itemID1);
      log.debug("Executing SQL query: {}", getDiffSQL);
      rs = stmt.executeQuery();
      return rs.next() ? new FixedRunningAverageAndStdDev(rs.getDouble(2), rs.getDouble(3), rs.getInt(1)) : null;
    } catch (SQLException sqle) {
      log.warn("Exception while retrieving diff", sqle);
      throw new TasteException(sqle);
    } finally {
      IOUtils.quietClose(rs, stmt, conn);

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          // result[i] is null for these values of i
        }
        if (i == size) {
          break;
        }
        result[i] = new FixedRunningAverageAndStdDev(rs.getDouble(2), rs.getDouble(3), rs.getInt(1));
        i++;
      }
    } catch (SQLException sqle) {
      log.warn("Exception while retrieving diff", sqle);
      throw new TasteException(sqle);

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      if (rs.next()) {
        double average = rs.getDouble(2);
        if (flipped) {
          average = -average;
        }
        return new FixedRunningAverageAndStdDev(average, rs.getDouble(3), rs.getInt(1));
      } else {
        return null;
      }
    } catch (SQLException sqle) {
      log.warn("Exception while retrieving diff", sqle);

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          // result[i] is null for these values of i
        }
        if (i == size) {
          break;
        }
        result[i] = new FixedRunningAverageAndStdDev(rs.getDouble(2), rs.getDouble(3), rs.getInt(1));
        i++;
      }
    } catch (SQLException sqle) {
      log.warn("Exception while retrieving diff", sqle);
      throw new TasteException(sqle);

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      if (rs.next()) {
        double average = rs.getDouble(2);
        if (flipped) {
          average = -average;
        }
        return new FixedRunningAverageAndStdDev(average, rs.getDouble(3), rs.getInt(1));
      } else {
        return null;
      }
    } catch (SQLException sqle) {
      log.warn("Exception while retrieving diff", sqle);

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          // result[i] is null for these values of i
        }
        if (i == size) {
          break;
        }
        result[i] = new FixedRunningAverageAndStdDev(rs.getDouble(2), rs.getDouble(3), rs.getInt(1));
        i++;
      }
    } catch (SQLException sqle) {
      log.warn("Exception while retrieving diff", sqle);
      throw new TasteException(sqle);

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