code: def _validate_context(self, ctx):
      if type(ctx).__name__ != "RequestContext":
          raise TypeError(
              "ctx must be a RequestContext; got: %r" % (ctx,)
          )
  
imports: import base64
  import collections
  import json
  import random
  from tensorboard import errors
  from tensorboard.compat.proto import summary_pb2
  from tensorboard.data import provider
  from tensorboard.util import tb_logging
  from tensorboard.util import tensor_util
label_desc: Use image node_id 3 for calling the MultiplexerDataProvider obj's underlying member method code with example usage: obj._validate_context(ctx) without return types