code: def _is_return_block(block):
      return (not block.instructions) and _is_indirect_return_op(
          block.terminator
      )
  
imports: import collections
  from tensorflow_probability.python.experimental.auto_batching import instructions
  from tensorflow_probability.python.experimental.auto_batching import liveness
label_desc: Use image node_id 4 for calling a global function with example usage: _is_return_block(block) and returns: unknown