class_docstr: Logger which filters keys in logged data.
class_docstr_tok: ["Logger","which","filters","keys","in","logged","data","."]
code: def close(self):
      self._to.close()
  
imports: import math
  import time
  from typing import Callable, Optional, Sequence
  from acme.utils.loggers import base
label_desc: Use image node_id 3 for calling the KeyFilter obj's underlying member method code with example usage: obj.close() without return types