class_docstr: Scalars Plugin for TensorBoard.
code: def frontend_metadata(self):
      return base_plugin.FrontendMetadata(
          element_name="tf-scalar-dashboard"
      )
  
imports: import csv
  import io
  import werkzeug.exceptions
  from werkzeug import wrappers
  from tensorboard import errors
  from tensorboard import plugin_util
  from tensorboard.backend import http_util
  from tensorboard.data import provider
  from tensorboard.plugins import base_plugin
  from tensorboard.plugins.scalar import metadata
label_desc: Use image node_id 4 for calling the ScalarsPlugin obj's underlying member method code with example usage: obj.frontend_metadata() and returns: base_plugin