wehub-resource-sync
55 lines
1.7 KiB
Python
55 lines
1.7 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.dataclass import FairseqDataclass
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@dataclass
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class SubwordNMTBPEConfig(FairseqDataclass):
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bpe_codes: str = field(default="???", metadata={"help": "path to subword NMT BPE"})
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bpe_separator: str = field(default="@@", metadata={"help": "BPE separator"})
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@register_bpe("subword_nmt", dataclass=SubwordNMTBPEConfig)
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class SubwordNMTBPE(object):
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def __init__(self, cfg):
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if cfg.bpe_codes is None:
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raise ValueError("--bpe-codes is required for --bpe=subword_nmt")
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codes = file_utils.cached_path(cfg.bpe_codes)
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try:
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from subword_nmt import apply_bpe
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bpe_parser = apply_bpe.create_parser()
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bpe_args = bpe_parser.parse_args(
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[
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"--codes",
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codes,
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"--separator",
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cfg.bpe_separator,
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]
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)
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self.bpe = apply_bpe.BPE(
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bpe_args.codes,
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bpe_args.merges,
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bpe_args.separator,
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None,
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bpe_args.glossaries,
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)
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self.bpe_symbol = bpe_args.separator + " "
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except ImportError:
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raise ImportError(
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"Please install subword_nmt with: pip install subword-nmt"
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)
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def encode(self, x: str) -> str:
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return self.bpe.process_line(x)
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def decode(self, x: str) -> str:
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return (x + " ").replace(self.bpe_symbol, "").rstrip()
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