code: def available_parameters_subset(self, mx_params):
          
          from copy import copy
          from collections import OrderedDict
          subset_params = copy(mx_params)
          subset_params._params = OrderedDict([
              (k, v) for k, v in mx_params.items() if k in self.weight_names
          ])
          return subset_params
docs: Takes an mxnet parameter collect (from Block.collect_params()) and
          subsets it with the parameters available in this base network.