class_docstr: A ring of memory buffers.
code: def get_next_buffer(self):
      self._index += 1
      self._index = self._index % self.num_buffers
      buff = self.buffers[self._index]
      assert not buff.is_in_use(), "buffer is already in use."
      return buff
  
file_path: apex/apex/transformer/tensor_parallel/memory.py
imports: import torch
label_desc: Use image node_id 2 for calling the RingMemBuffer obj's underlying member method code with example usage: obj.get_next_buffer() and returns: buff