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| # 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. | |
| """ | |
| Use this script in order to build symmetric alignments for your translation | |
| dataset. | |
| This script depends on fast_align and mosesdecoder tools. You will need to | |
| build those before running the script. | |
| fast_align: | |
| github: http://github.com/clab/fast_align | |
| instructions: follow the instructions in README.md | |
| mosesdecoder: | |
| github: http://github.com/moses-smt/mosesdecoder | |
| instructions: http://www.statmt.org/moses/?n=Development.GetStarted | |
| The script produces the following files under --output_dir: | |
| text.joined - concatenation of lines from the source_file and the | |
| target_file. | |
| align.forward - forward pass of fast_align. | |
| align.backward - backward pass of fast_align. | |
| aligned.sym_heuristic - symmetrized alignment. | |
| """ | |
| import argparse | |
| import os | |
| from itertools import zip_longest | |
| def main(): | |
| parser = argparse.ArgumentParser(description="symmetric alignment builer") | |
| # fmt: off | |
| parser.add_argument('--fast_align_dir', | |
| help='path to fast_align build directory') | |
| parser.add_argument('--mosesdecoder_dir', | |
| help='path to mosesdecoder root directory') | |
| parser.add_argument('--sym_heuristic', | |
| help='heuristic to use for symmetrization', | |
| default='grow-diag-final-and') | |
| parser.add_argument('--source_file', | |
| help='path to a file with sentences ' | |
| 'in the source language') | |
| parser.add_argument('--target_file', | |
| help='path to a file with sentences ' | |
| 'in the target language') | |
| parser.add_argument('--output_dir', | |
| help='output directory') | |
| # fmt: on | |
| args = parser.parse_args() | |
| fast_align_bin = os.path.join(args.fast_align_dir, "fast_align") | |
| symal_bin = os.path.join(args.mosesdecoder_dir, "bin", "symal") | |
| sym_fast_align_bin = os.path.join( | |
| args.mosesdecoder_dir, "scripts", "ems", "support", "symmetrize-fast-align.perl" | |
| ) | |
| # create joined file | |
| joined_file = os.path.join(args.output_dir, "text.joined") | |
| with open(args.source_file, "r", encoding="utf-8") as src, open( | |
| args.target_file, "r", encoding="utf-8" | |
| ) as tgt: | |
| with open(joined_file, "w", encoding="utf-8") as joined: | |
| for s, t in zip_longest(src, tgt): | |
| print("{} ||| {}".format(s.strip(), t.strip()), file=joined) | |
| bwd_align_file = os.path.join(args.output_dir, "align.backward") | |
| # run forward alignment | |
| fwd_align_file = os.path.join(args.output_dir, "align.forward") | |
| fwd_fast_align_cmd = "{FASTALIGN} -i {JOINED} -d -o -v > {FWD}".format( | |
| FASTALIGN=fast_align_bin, JOINED=joined_file, FWD=fwd_align_file | |
| ) | |
| assert os.system(fwd_fast_align_cmd) == 0 | |
| # run backward alignment | |
| bwd_align_file = os.path.join(args.output_dir, "align.backward") | |
| bwd_fast_align_cmd = "{FASTALIGN} -i {JOINED} -d -o -v -r > {BWD}".format( | |
| FASTALIGN=fast_align_bin, JOINED=joined_file, BWD=bwd_align_file | |
| ) | |
| assert os.system(bwd_fast_align_cmd) == 0 | |
| # run symmetrization | |
| sym_out_file = os.path.join(args.output_dir, "aligned") | |
| sym_cmd = "{SYMFASTALIGN} {FWD} {BWD} {SRC} {TGT} {OUT} {HEURISTIC} {SYMAL}".format( | |
| SYMFASTALIGN=sym_fast_align_bin, | |
| FWD=fwd_align_file, | |
| BWD=bwd_align_file, | |
| SRC=args.source_file, | |
| TGT=args.target_file, | |
| OUT=sym_out_file, | |
| HEURISTIC=args.sym_heuristic, | |
| SYMAL=symal_bin, | |
| ) | |
| assert os.system(sym_cmd) == 0 | |
| if __name__ == "__main__": | |
| main() | |