from typing import List, Iterator, Dict
from overrides import overrides
from ..token_indexers import TokenIndexer
from .. import Vocabulary
from . import Field
[docs]class SequenceLabelField(Field):
def __init__(self,
name: str,
tokens: List[str],
indexers: List[TokenIndexer]):
self.name = name
self.tokens = tokens
self.indexers = indexers
def __iter__(self) -> Iterator[str]:
return iter(self.tokens)
def __getitem__(self, idx: int) -> str:
return self.tokens[idx]
def __len__(self) -> int:
return len(self.tokens)
def __str__(self) -> str:
return '{}: [{}]'.format(self.name, ', '.join(self.tokens))
[docs] @overrides
def count_vocab_items(self, counters: Dict[str, Dict[str, int]]) -> None:
for idxer in self.indexers:
for token in self.tokens:
idxer.count_vocab_items(token, counters)
[docs] @overrides
def index(self, vocab: Vocabulary) -> None:
self.indexes = {}
for idxer in self.indexers:
self.indexes.update(idxer.tokens_to_indices(self.tokens, vocab))