code: def _save_requests(self, filepath=None):
      # TODO: Deal with any overwrite issues
      if len(self.request_cache) == 0:
          crypten.log("Request cache not saved - cache is empty")
          return
      filepath = self._get_request_path(prefix=filepath)
      torch.save(self.request_cache, filepath)
      self.request_cache = []
  
imports: import os
  import crypten
  import crypten.communicator
  import torch
label_desc: Use image node_id 7 for calling the TupleProvider obj's underlying member method code with example usage: obj._save_requests(filepath) without return types