File size: 1,111 Bytes
489f5e9 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | from __future__ import annotations
from typing import Sequence
class SimpleEncoder:
"""Whitespace fallback encoder when BPE unavailable."""
def __init__(self, vocab: dict[str, int] | None = None):
self.vocab = vocab or {"<pad>":0,"<unk>":1,"<bos>":2,"<eos>":3}
self.id_to_token = {i:t for t,i in self.vocab.items()}
self.unk_id = self.vocab.get("<unk>", 1)
self.pad_id = self.vocab.get("<pad>", 0)
self.bos_id = self.vocab.get("<bos>", 2)
self.eos_id = self.vocab.get("<eos>", 3)
def encode(self, text: str, add_special: bool = True) -> list[int]:
toks = text.split()
ids = [self.vocab.get(t, self.unk_id) for t in toks]
if add_special:
ids = [self.bos_id] + ids + [self.eos_id]
return ids
def decode(self, ids: Sequence[int], skip_special: bool = True) -> str:
special = {self.pad_id, self.bos_id, self.eos_id}
toks = []
for i in ids:
if skip_special and i in special: continue
toks.append(self.id_to_token.get(i, "<unk>"))
return " ".join(toks)
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