class_docstr: The TPUEmbedding Base class.
  
  This class only contains the basic logic to check the feature config and table
  config for the tpu embedding mid level APIs.
docstr: Create variables and slots variables for TPU embeddings.
docstr_tok: ["Create","variables","and","slots","variables","for","TPU","embeddings","."]
code: def _create_variables_and_slots(self):
      """Create variables and slots variables for TPU embeddings."""
      raise NotImplementedError
  
file_path: tensorflow-upstream/tensorflow/python/tpu/tpu_embedding_base.py
imports: import functools
  from typing import Any, Dict, Iterable, Optional, Union, Text
  from tensorflow.python.framework import dtypes
  from tensorflow.python.ops import variables
  from tensorflow.python.tpu import tpu_embedding_v2_utils
  from tensorflow.python.trackable import autotrackable
  from tensorflow.python.util import nest
label_desc: Use image node_id 4 for calling the TPUEmbeddingBase obj's underlying member method code with example usage: obj._create_variables_and_slots() without return types