class_docstr: Two-gram benchmark model.
  
  :param inferenceType: (:class:`nupic.frameworks.opf.opf_utils.InferenceType`)
  :param encoders: a dict of dicts, eventually sent to
         :meth:`~nupic.encoders.multi.MultiEncoder.addMultipleEncoders` (see
         docs of that method for param details).
docstr: :param proto: capnp TwoGramModelProto message reader
docstr_tok: [":","param","proto",":","capnp","TwoGramModelProto","message","reader"]
code: def read(cls, proto):
      """
      :param proto: capnp TwoGramModelProto message reader
      """
      instance = object.__new__(cls)
      super(TwoGramModel, instance).__init__(proto=proto.modelBase)
  
      instance._logger = opf_utils.initLogger(instance)
  
      instance._reset = proto.reset
      instance._hashToValueDict = {
          x.hash: x.value for x in proto.hashToValueDict
      }
      instance._learningEnabled = proto.learningEnabled
      instance._encoder = encoders.MultiEncoder.read(proto.encoder)
      instance._fieldNames = instance._encoder.getScalarNames()
      instance._prevValues = list(proto.prevValues)
      instance._twoGramDicts = [
          dict() for _ in xrange(len(proto.twoGramDicts))
      ]
      for idx, field in enumerate(proto.twoGramDicts):
          for entry in field:
              prev = None if entry.value == -1 else entry.value
              instance._twoGramDicts[idx][
                  prev
              ] = collections.defaultdict(int)
              for bucket in entry.buckets:
                  instance._twoGramDicts[idx][prev][
                      bucket.index
                  ] = bucket.count
  
      return instance
  
imports: import collections
  import itertools
  from nupic import encoders
  from nupic.data import field_meta
  from nupic.frameworks.opf import model
  from nupic.frameworks.opf import opf_utils
  from opf_utils import InferenceType
label_desc: Use image node_id 10 for calling the TwoGramModel obj's underlying member method code with example usage: obj.read(cls, proto) and returns: instance