code: def _write_histogram(self, run, tag, description=None):
      subdir = os.path.join(self._logdir, run)
      writer = tf.summary.create_file_writer(subdir)
  
      with writer.as_default():
          data = tf.random.normal(shape=[3])
          tf.summary.histogram(
              tag, data, step=0, description=description
          )
          writer.flush()
      self._multiplexer.AddRunsFromDirectory(self._logdir)
  
imports: import argparse
  import collections.abc
  import os.path
  import tensorflow.compat.v1
  import tensorflow.compat.v2
  from tensorboard import context
  from tensorboard.backend.event_processing import data_provider
  from tensorboard.backend.event_processing import plugin_event_multiplexer
  from tensorboard.data import provider
  from tensorboard.plugins import base_plugin
  from tensorboard.plugins.image import metadata
  from tensorboard.plugins.metrics import metrics_plugin
label_desc: Use image node_id 4 for calling the MetricsPluginTest obj's underlying member method code with example usage: obj._write_histogram(run, tag, description) without return types