code: def train(self):
      
      for iDriving, cDriving in enumerate(self.drivingOperandSDRs):
        minicolumnSDR = self.minicolumnSDRs[iDriving]
        self.pairLayerProximalConnections.associate(minicolumnSDR, cDriving)
        for iContext, cContext in enumerate(self.contextOperandSDRs):
          iResult = (iContext + iDriving) % self.numLocations
          cResult = self.resultSDRs[iResult]
          self.pairLayer.compute(minicolumnSDR, basalInput=cContext)
          cPair = self.pairLayer.getWinnerCells()
          self.poolingLayer.associate(cResult, cPair)
docs: Train the pair layer and pooling layer.