Remove the codes to remove the checkpoint directory. (#1149)

dlrover/trainer/torch/flash_checkpoint/ddp.py

@@ -106,8 +106,6 @@ def save_checkpoint(
  raise ValueError(
  "path cannot be empty if storage type is disk!"
  )
- if self._rank == 0:
- self.storage.safe_rmtree(os.path.dirname(path))
  self._engine.save_to_storage(step, state_dict, paths)
  else:
  raise ValueError(f"No support storage type {storage_type}")