code: def afterOptimizerStep(
      self, retrievedPosIndexes, retrievedNegIndexes=None
  ):
      reshapedRetrieval = self._getReshapedRetrieval(
          retrievedPosIndexes, retrievedNegIndexes
      )
  
      self.pytorchCPUVar[reshapedRetrieval] = (
          self.model_variable.weight.data.detach().cpu().pin_memory()
      )
  
imports: import torch
  import os
  import numpy
label_desc: Use image node_id 8 for calling the CPUPytorchModelFactory obj's underlying member method code with example usage: obj.afterOptimizerStep(retrievedPosIndexes, retrievedNegIndexes) without return types