code: def test_summarywriter_histogram_defaultbins(self):
      log_dir = tempfile.mkdtemp()
      summary_writer = SummaryWriter(log_dir=log_dir)
      histogram = np.arange(1000)
      # Histogram will be created for 30 (default) bins.
      summary_writer.histogram(
          tag="histogram_test", values=histogram, step=1
      )
  
      summary_value = self.parse_and_return_summary_value(path=log_dir)
      self.assertEqual(summary_value.tag, "histogram_test")
      actual_histogram = tensor_util.make_ndarray(summary_value.tensor)
      self.assertTrue(actual_histogram.shape, (30, 3))
      self.assertTrue(
          np.allclose(
              actual_histogram[0], (0.0, 33.3, 34.0), atol=1e-01
          )
      )
  
imports: import itertools
  import pathlib
  import tempfile
  import numpy
  import tensorflow
  from absl.testing import absltest
  from tensorboard.backend.event_processing import directory_watcher, event_file_loader
  from tensorboard.util import tensor_util
  from flax.metrics.tensorboard import SummaryWriter, _flatten_dict
label_desc: Use image node_id 14 for calling the TensorboardTest obj's underlying member method code with example usage: obj.test_summarywriter_histogram_defaultbins() without return types