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#!/usr/bin/env python3
# Copyright (c) Facebook, Inc. and its affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
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)
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