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 _check_blobs(self, blobs):
      has_blobs = self.has_blobs()
      if has_blobs and blobs is None:
          raise ValueError("inconsistent use of blobs")
      if self.iteration > 0 and blobs is not None and not has_blobs:
          raise ValueError("inconsistent use of blobs")
  
imports: import numpy
  from ..None import autocorr
  from ..state import State
label_desc: Use image node_id 11 for calling the Backend obj's underlying member method code with example usage: obj._check_blobs(blobs) without return types