class_docstr: Partial feature stats for natural language.
docstr: Merge two partial natual language stats.
docstr_tok: ["Merge","two","partial","natual","language","stats","."]
code: def __iadd__(self, other: "_PartialNLStats") -> "_PartialNLStats":
      """Merge two partial natual language stats."""
      self.matched += other.matched
      self.considered += other.considered
      self.invalidate |= other.invalidate
      return self
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import abc
  from typing import Optional
  import numpy
  import pyarrow
  import six
  from tensorflow_data_validation import types
  from tensorflow_data_validation.statistics.generators import stats_generator
  from tensorflow_data_validation.utils import stats_util
  from tfx_bsl.arrow import array_util
  from typing import Iterable, Text
  from tensorflow_metadata.proto.v0 import statistics_pb2
label_desc: Use image node_id 2 for calling the _PartialNLStats obj's underlying member method code with example usage: obj.__iadd__(other) and returns: self