code: def save(self):
      nd.save(
          fname=os.path.join(
              self.prefix, "%d_centers.param" % self.rank
          ),
          data=self.weight,
      )
      nd.save(
          fname=os.path.join(
              self.prefix, "%d_centers_mom.param" % self.rank
          ),
          data=self.weight_mom,
      )
  
file_path: insightface/recognition/partial_fc/mxnet/memory_bank.py
imports: import os
  import numpy
  from mxnet import nd
  import mxnet
  from memory_samplers import WeightIndexSampler
label_desc: Use image node_id 5 for calling the MemoryBank obj's underlying member method code with example usage: obj.save() without return types