code: def test_read_tensors(self):
      multiplexer = self.create_multiplexer()
      provider = data_provider.MultiplexerDataProvider(
          multiplexer, self.logdir
      )
  
      run_tag_filter = base_provider.RunTagFilter(
          runs=["lebesgue"],
          tags=["uniform", "bimodal"],
      )
      result = provider.read_tensors(
          self.ctx,
          experiment_id="unused",
          plugin_name=histogram_metadata.PLUGIN_NAME,
          run_tag_filter=run_tag_filter,
          downsample=100,
      )
  
      self.assertCountEqual(result.keys(), ["lebesgue"])
      self.assertCountEqual(
          result["lebesgue"].keys(), ["uniform", "bimodal"]
      )
      for run in result:
          for tag in result[run]:
              tensor_events = multiplexer.Tensors(run, tag)
              self.assertLen(result[run][tag], len(tensor_events))
              for datum, event in zip(result[run][tag], tensor_events):
                  self.assertEqual(datum.step, event.step)
                  self.assertEqual(datum.wall_time, event.wall_time)
                  np.testing.assert_equal(
                      datum.numpy,
                      tensor_util.make_ndarray(event.tensor_proto),
                  )
  
imports: import os
  import numpy
  from tensorboard import context
  from tensorboard.backend.event_processing import data_provider
  from tensorboard.backend.event_processing import plugin_event_multiplexer
  from tensorboard.compat.proto import summary_pb2
  from tensorboard.data import provider
  from tensorboard.plugins.graph import metadata
  from tensorboard.plugins.histogram import metadata
  from tensorboard.plugins.histogram import summary_v2
  from tensorboard.plugins.scalar import metadata
  from tensorboard.plugins.scalar import summary_v2
  from tensorboard.plugins.image import metadata
  from tensorboard.plugins.image import summary_v2
  from tensorboard.util import tensor_util
  import tensorflow.compat.v1
  import tensorflow.compat.v2
label_desc: Use image node_id 16 for calling the MultiplexerDataProviderTest obj's underlying member method code with example usage: obj.test_read_tensors() without return types