pass charset and max length to all featurizers regardless of type

  learning tasks.

  """

  def __init__(self, featurizer = OneHotFeaturizer, charset: Optional[str] = "ATCGN", max_length: Optional[int] = None):

  def __init__(self, featurizer = OneHotFeaturizer, charset: Optional[str] = "ATCGN", max_length: Optional[int] = None, validate: bool = True):

    """Initialize FASTALoader.

    Parameters

      full FASTA-format protein sequences, and full FASTA format nucleic acid

      sequences.

      Currently acceptable charsets are: "protein", "nucleic", and "ATCGN".

      This argument is currently only used if featurizer = OneHotFeaturizer.

    max_length: Optional[int] (default: None)

      max_length is only used if featurizer = OneHotFeaturizer.

    if isinstance(featurizer, UserDefinedFeaturizer):

      self.user_specified_features = featurizer.feature_fields

    if (featurizer == OneHotFeaturizer):

      featurizer = OneHotFeaturizer(self.charset, max_length)

    else:

      featurizer = featurizer()

    featurizer = featurizer(charset = self.charset, max_length = max_length)

    self.featurizer = featurizer