code: def afterOptimizerStep(
      self, retrievedPosIndexes, retrievedNegIndexes=None
  ):
      reshapedRetrieval = self._getReshapedRetrieval(
          retrievedPosIndexes, retrievedNegIndexes
      )
  
      for idx, optVar in enumerate(self.optVarList):
          self.pytorchCPUVar[idx][reshapedRetrieval] = (
              self.given_optimizer.state_dict()["state"][
                  self.optimizerKey
              ][optVar]
              .detach()
              .cpu()
              .pin_memory()
          )
  
imports: import torch
  import os
  import numpy
label_desc: Use image node_id 4 for calling the CPUPytorchOptimizerFactory obj's underlying member method code with example usage: obj.afterOptimizerStep(retrievedPosIndexes, retrievedNegIndexes) without return types