code: def default_specs(self):
      return {
          "action": specs.TensorSpec([3], tf.float32, "action"),
          "camera": specs.TensorSpec([5], tf.float32, "camera"),
          "lidar": specs.TensorSpec([3, 2], tf.float32, "lidar"),
      }
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import numpy
  import tensorflow
  from tf_agents import specs
  from tf_agents.replay_buffers import episodic_table
  from tensorflow.python.framework import test_util
label_desc: Use image node_id 1 for calling the EpisodicTableTest obj's underlying member method code with example usage: obj.default_specs() and returns: dict