class_docstr: Embedding projector.
class_docstr_tok: ["Embedding","projector","."]
docstr: Returns a list of runs that have embeddings.
code: def _serve_runs(self, request):
      """Returns a list of runs that have embeddings."""
      self._update_configs()
      return Respond(
          request, list(self._configs.keys()), "application/json"
      )
  
imports: import collections
  import functools
  import imghdr
  import mimetypes
  import os
  import threading
  import numpy
  from werkzeug import wrappers
  from google.protobuf import json_format
  from google.protobuf import text_format
  from tensorboard import context
  from tensorboard.backend.event_processing import plugin_asset_util
  from tensorboard.backend.http_util import Respond
  from tensorboard.compat import tf
  from tensorboard.plugins import base_plugin
  from tensorboard.plugins.projector import metadata
  from tensorboard.plugins.projector.projector_config_pb2 import ProjectorConfig
  from tensorboard.util import tb_logging
label_desc: Use image node_id 16 for calling the ProjectorPlugin obj's underlying member method code with example usage: obj._serve_runs(request) and returns: Respond