class_docstr: DoFn that extracts a unique fingerprint for each example.
  
  This class computes fingerprints by combining the identifier features.
class_docstr_tok: ["DoFn","that","extracts","a","unique","fingerprint","for","each","example",".","This","class","computes","fingerprints","by","combining","the","identifier","features","."]
docstr: Initializes _ExtractIdentifiers.
  
  Args:
    identifier_features: The names of the features to use to compute a
      fingerprint for the example.
    float_round_ndigits: Number of digits precision after the decimal point to
      which to round float values before generating the fingerprint.
docstr_tok: ["Initializes","_ExtractIdentifiers",".","Args",":","identifier_features",":","The","names","of","the","features","to","use","to","compute","a","fingerprint","for","the","example",".","float_round_ndigits",":","Number","of","digits","precision","after","the","decimal","point","to","which","to","round","float","values","before","generating","the","fingerprint","."]
code: def __init__(
      self,
      identifier_features: List[types.FeatureName],
      float_round_ndigits: Optional[int],
  ) -> None:
      """Initializes _ExtractIdentifiers.
  
      Args:
        identifier_features: The names of the features to use to compute a
          fingerprint for the example.
        float_round_ndigits: Number of digits precision after the decimal point to
          which to round float values before generating the fingerprint.
      """
      self._identifier_features = sorted(identifier_features)
      self._float_round_ndigits = float_round_ndigits
  
imports: from typing import Any, Dict, Iterable, Iterator, List, Optional, Tuple, Union
  import apache_beam
  import farmhash
  import numpy
  import tensorflow
  from tensorflow_data_validation import constants
  from tensorflow_data_validation import types
  from tensorflow_data_validation.utils import artifacts_io_impl
  from tensorflow_data_validation.skew.protos import feature_skew_results_pb2
label_desc: Use image node_id 1 to create a new _ExtractIdentifiers object from inherited base classes: beam with example: obj = _ExtractIdentifiers(identifier_features, float_round_ndigits)