class_docstr: A precision / recall / F score.
class_docstr_tok: ["A","precision","\/","recall","\/","F","score","."]
code: def __init__(
      self,
      *,
      tp: int = 0,
      fp: int = 0,
      fn: int = 0,
  ) -> None:
      self.tp = tp
      self.fp = fp
      self.fn = fn
  
imports: from collections import defaultdict
  from typing import TYPE_CHECKING, Any, Callable, Dict, Iterable, List, Optional, Set, Tuple
  import numpy
  from .errors import Errors
  from .morphology import Morphology
  from .tokens import Doc, Span, Token
  from .training import Example
  from .util import SimpleFrozenList, get_lang_class
label_desc: Use image node_id 1 to create a new PRFScore object  with example: obj = PRFScore()