class_docstr: Implements the TF backend ops for a PC auto-batching VM.
code: def variable_class(self):
      return (
          instructions.NullVariable,
          instructions.TemporaryVariable,
          RegisterTensorFlowVariable,
          FullTensorFlowVariable,
      )
  
imports: import collections
  import contextlib
  import six
  import tensorflow.compat.v1
  import tensorflow.compat.v2
  from tensorflow_probability.python.experimental.auto_batching import instructions
  from tensorflow_probability.python.experimental.auto_batching import xla
  from tensorflow_probability.python.internal import dtype_util
  from tensorflow.python.ops import control_flow_util
label_desc: Use image node_id 2 for calling the TensorFlowBackend obj's underlying member method code with example usage: obj.variable_class() and returns: instructions,  instructions,  RegisterTensorFlowVariable,  FullTensorFlowVariable