class_docstr: A simple default backend that stores the chain in memory
class_docstr_tok: ["A","simple","default","backend","that","stores","the","chain","in","memory"]
code: def __enter__(self):
      return self
  
imports: import numpy
  from ..None import autocorr
  from ..state import State
label_desc: Use image node_id 15 for calling the Backend obj's underlying member method code with example usage: obj.__enter__() and returns: self