class_docstr: Write encoded protobuf to a file with packing defined in tensorflow.
code: def closed(self):
      return self._writer.closed
  
file_path: tensorboard/tensorboard/summary/writer/record_writer.py
imports: import struct
  from tensorboard.compat.tensorflow_stub.pywrap_tensorflow import masked_crc32c
label_desc: Use image node_id 5 for calling the RecordWriter obj's underlying member method code with example usage: obj.closed() and returns: self