wehub-resource-sync
49 lines
1.4 KiB
Python
49 lines
1.4 KiB
Python
# Copyright (c) Facebook, Inc. and its affiliates.
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#
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# This source code is licensed under the MIT license found in the
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# LICENSE file in the root directory of this source tree.
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from dataclasses import dataclass, field
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from fairseq import file_utils
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from fairseq.data.encoders import register_bpe
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from fairseq.data.encoders.byte_utils import (
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SPACE,
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SPACE_ESCAPE,
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byte_encode,
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smart_byte_decode,
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)
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from fairseq.dataclass import FairseqDataclass
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@dataclass
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class ByteBpeConfig(FairseqDataclass):
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sentencepiece_model_path: str = field(
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default="???", metadata={"help": "path to sentencepiece model"}
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)
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@register_bpe("byte_bpe", dataclass=ByteBpeConfig)
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class ByteBPE(object):
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def __init__(self, cfg):
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vocab = file_utils.cached_path(cfg.sentencepiece_model_path)
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try:
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import sentencepiece as spm
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self.sp = spm.SentencePieceProcessor()
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self.sp.Load(vocab)
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except ImportError:
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raise ImportError(
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"Please install sentencepiece with: pip install sentencepiece"
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)
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def encode(self, x: str) -> str:
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byte_encoded = byte_encode(x)
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return SPACE.join(self.sp.EncodeAsPieces(byte_encoded))
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@staticmethod
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def decode(x: str) -> str:
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unescaped = x.replace(SPACE, "").replace(SPACE_ESCAPE, SPACE)
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return smart_byte_decode(unescaped)
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