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|
| import argparse |
| import re |
| import sys |
|
|
|
|
| class OOVIndexError(IndexError): |
| def __init__(self, pos, source_seq, target_seq): |
| super(OOVIndexError, self).__init__( |
| "A <unk-N> tag in the target sequence refers to a position that is " |
| "outside the source sequence. Most likely there was a mismatch in " |
| "provided source and target sequences. Otherwise this would mean that " |
| "the pointing mechanism somehow attended to a position that is past " |
| "the actual sequence end." |
| ) |
| self.source_pos = pos |
| self.source_seq = source_seq |
| self.target_seq = target_seq |
|
|
|
|
| def replace_oovs(source_in, target_in, target_out): |
| """Replaces <unk-N> tokens in the target text with the corresponding word in |
| the source text. |
| """ |
|
|
| oov_re = re.compile("^<unk-([0-9]+)>$") |
|
|
| for source_seq, target_seq in zip(source_in, target_in): |
| target_seq_out = [] |
|
|
| pos_to_word = source_seq.strip().split() |
| for token in target_seq.strip().split(): |
| m = oov_re.match(token) |
| if m: |
| pos = int(m.group(1)) |
| if pos >= len(pos_to_word): |
| raise OOVIndexError(pos, source_seq, target_seq) |
| token_out = pos_to_word[pos] |
| else: |
| token_out = token |
| target_seq_out.append(token_out) |
| target_out.write(" ".join(target_seq_out) + "\n") |
|
|
|
|
| def main(): |
| parser = argparse.ArgumentParser( |
| description="Replaces <unk-N> tokens in target sequences with words from " |
| "the corresponding position in the source sequence." |
| ) |
| parser.add_argument( |
| "--source", type=str, help="text file with source sequences", required=True |
| ) |
| parser.add_argument( |
| "--target", type=str, help="text file with target sequences", required=True |
| ) |
| parser.add_argument( |
| "--target-out", |
| type=str, |
| help="where to write target sequences without <unk-N> " "entries", |
| required=True, |
| ) |
| args = parser.parse_args() |
|
|
| target_in = ( |
| open(args.target, "r", encoding="utf-8") if args.target is not None else None |
| ) |
| target_out = ( |
| open(args.target_out, "w", encoding="utf-8") |
| if args.target_out is not None |
| else None |
| ) |
| with open(args.source, "r", encoding="utf-8") as source_in, open( |
| args.target, "r", encoding="utf-8" |
| ) as target_in, open(args.target_out, "w", encoding="utf-8") as target_out: |
| replace_oovs(source_in, target_in, target_out) |
|
|
|
|
| if __name__ == "__main__": |
| try: |
| main() |
| except OOVIndexError as e: |
| print(e, file=sys.stderr) |
| print("Source sequence:", e.source_seq.strip(), file=sys.stderr) |
| print("Target sequence:", e.target_seq.strip(), file=sys.stderr) |
| print( |
| "Source sequence length:", |
| len(e.source_seq.strip().split()), |
| file=sys.stderr, |
| ) |
| print("The offending tag points to:", e.source_pos) |
| sys.exit(2) |
|
|
