class_docstr: A Masked Language Model for Finetune
  
  :param config: A :py:class:`finetune.config.Settings` object or None (for default config).
  :param \**kwargs: key-value pairs of config items to override.
code: def _target_model(
      config,
      featurizer_state,
      n_outputs,
      train=False,
      reuse=None,
      **kwargs,
  ):
      raise ValueError("Target model is unused for MLM")
  
imports: import tensorflow
  from tensorflow import TensorShape
  import numpy
  from finetune.errors import FinetuneError
  from finetune.base import PredictMode, BaseModel
  from finetune.base_models import RoBERTa, BERT
  from finetune.input_pipeline import BasePipeline
  from finetune.nn.target_blocks import masked_language_model
label_desc: Use image node_id 8 for calling the MaskedLanguageModel obj's underlying member method code with example usage: obj._target_model(config, featurizer_state, n_outputs, train, reuse) without return types