code: def testLoad_dynamicEventFileWithTruncation(self):
      self._append_record(_make_event(wall_time=1.0))
      self._append_record(_make_event(wall_time=2.0))
      loader = self._make_loader()
      # Use memory file to get at the raw record to emit.
      with io.BytesIO() as mem_f:
          record_writer.RecordWriter(mem_f).write(
              _make_event(wall_time=3.0)
          )
          record = mem_f.getvalue()
      filepath = os.path.join(self.get_temp_dir(), FILENAME)
      with open(filepath, "ab", buffering=0) as f:
          # Record missing the last byte should result in data loss error
          # that we log and swallow.
          f.write(record[:-1])
          self.assertEventWallTimes(loader.Load(), [1.0, 2.0])
          # Retrying against the incomplete record has no effect.
          self.assertEmpty(list(loader.Load()))
          # Retrying after completing the record should return the new event.
          f.write(record[-1:])
          self.assertEventWallTimes(loader.Load(), [3.0])
  
imports: import abc
  import io
  import os
  import unittest
  from unittest import mock
  from tensorboard import test
  from tensorboard.backend.event_processing import event_file_loader
  from tensorboard.compat import tf
  from tensorboard.compat.proto import event_pb2
  from tensorboard.summary.writer import record_writer
label_desc: Use image node_id 9 for calling the EventFileLoaderTestBase obj's underlying member method code with example usage: obj.testLoad_dynamicEventFileWithTruncation() without return types