Possible bug in logistic regression of classification package

[qf6101]

Miss intercept in predict method of LRModel. Does this only consider the rank tasks?

  override
  def predict(dataSet: DataBlock[LabeledData]): DataBlock[PredictResult] = {
    val start = System.currentTimeMillis()
    val wVector = weight.getRow(0)
    val cost = System.currentTimeMillis() - start
    LOG.info(s"pull LR Model from PS cost $cost ms.")

    val predict = new MemoryDataBlock[PredictResult](-1)

    dataSet.resetReadIndex()
    for (idx: Int <- 0 until dataSet.size) {
      val instance = dataSet.read
      val id = instance.getY
      val dot = wVector.dot(instance.getX)
      val sig = Maths.sigmoid(dot)
      predict.put(new LRPredictResult(id, dot, sig))
    }
    predict
  }
}