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translate.py
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#!/usr/bin/env python3
from datetime import datetime
from os import path, remove, system
from paths import Paths
import argparse, re, traceback
allowed_langs = ['de', 'en', 'fi', 'fr', 'nl', 'sv']
parser = argparse.ArgumentParser(description='Translate SRT-formatted subtitles between six MeMAD languages: de, en, fi, fr, nl, sv.')
required_arguments = parser.add_argument_group('required arguments')
required_arguments.add_argument('-i', '--input', type=str, required=True, help='path to the input subtitle file (required)')
required_arguments.add_argument('-o', '--output', type=str, required=True, help='name of the output subtitle file (required)')
required_arguments.add_argument('-s', '--src-lang', choices=allowed_langs, required=True, help='the language of the translation input (required)')
required_arguments.add_argument('-t', '--tgt-lang', choices=allowed_langs, required=True, help='the language of the translation output (required)')
parser.add_argument('-v', '--verbose', action='store_true', default=False, help='verbose feedback messages (default: False)')
parser.add_argument('-l', '--log', type=str, default=None, help='path to the log file to use for progress logging (default: None)')
parser.add_argument('-p', '--strict-sentence-parsing', action='store_true', default=False, help='use a strict sentence parser alternative that relies on punctuation (default: False)')
parser.add_argument('-g', '--gpu-devices', type=int, default=0, help='use this many GPU devices for NMT decoding (default: 0, CPU-based computation)')
parser.add_argument('-c', '--cpu-threads', type=int, default=1, help='use this many CPU threads for NMT decoding (default: 1)')
parser.add_argument('--plain-text-mode', action='store_true', default=False, help='translate from plain text (one sentence per line) instead of SRT (default: False)')
args = parser.parse_args()
paths = Paths()
moses_dir = paths.get('MOSES-DIR')
marian_dir = paths.get('MARIAN-DIR')
opustoolsperl_dir = paths.get('OPUSTOOLSPERL-DIR')
subalign_dir = paths.get('SUBALIGN-DIR')
scripts_dir = paths.get('SCRIPTS-DIR')
models_dir = paths.get('MODELS-DIR')
temp_dir = paths.get('TEMP-DIR')
def append_to_file(path, line):
with open(path, mode='a', encoding='utf-8') as out_file:
out_file.write('%s\n' % line)
def log(source, message):
line = '[%s] [%s] %s' % (datetime.now(), source.upper(), message)
if args.verbose:
print(line)
if args.log:
append_to_file(args.log, line)
if args.src_lang == args.tgt_lang:
log('EXCEPTION', 'The translation direction %s->%s is not valid.' % (args.src_lang, args.tgt_lang))
try:
inp_path = args.input.strip()
out_path = args.output.strip()
inp_name = path.basename(inp_path)
out_name = path.basename(out_path)
tmp_name = '%s.%s' % (inp_name, out_name)
src_lang = args.src_lang.strip()
tgt_lang = args.tgt_lang.strip()
tmp_paths = []
log('PREPROCESSING', 'Preprocessing input subtitles...')
if not args.plain_text_mode:
log('PREPROCESSING', '...parsing sentences...')
if args.strict_sentence_parsing:
exe_path = path.join(scripts_dir, 'srt2sent.py')
snt_path = path.join(temp_dir, tmp_name + '.sentences')
tmp_paths.append(snt_path)
system('%s -i %s -o %s' % (exe_path, inp_path, snt_path))
assert path.isfile(snt_path)
else:
exe_path = path.join(subalign_dir, 'srt2xml')
xml_path = path.join(temp_dir, tmp_name + '.xml')
system('%s -e utf8 -r %s < %s' % (exe_path, xml_path, inp_path))
assert path.isfile(xml_path)
tmp_paths.append(xml_path)
exe_path = path.join(opustoolsperl_dir, 'opus2text')
snt_path = path.join(temp_dir, tmp_name + '.sentences')
system('%s < %s > %s' % (exe_path, xml_path, snt_path))
assert path.isfile(snt_path)
tmp_paths.append(snt_path)
else:
snt_path = inp_path
log('PREPROCESSING', '...preprocessing sentences...')
exe_path = path.join(scripts_dir, 'preprocess.sh')
str_path = path.join(temp_dir, tmp_name + '.strip')
system('%s %s %s %s %s' % (exe_path, moses_dir, src_lang, snt_path, str_path))
assert path.isfile(str_path)
tmp_paths.append(str_path)
log('PREPROCESSING', '...applying subword segmentation for restoration...')
exe_path = path.join(scripts_dir, 'sentencepiece-apply.py')
uni_path = path.join(temp_dir, tmp_name + '.strip.uni24k')
mdl_path = path.join(models_dir, 'sentencepiece.%s.uni24k.model' % src_lang)
system('%s --input %s --output %s --model %s' % (exe_path, str_path, uni_path, mdl_path))
assert path.isfile(uni_path)
tmp_paths.append(uni_path)
log('PREPROCESSING', '...done!')
if args.gpu_devices > 0:
comp_node = '"--devices %s"' % (' '.join([str(gpuid) for gpuid in range(args.gpu_devices)]))
else:
comp_node = '"--cpu-threads %d"' % args.cpu_threads
log('RESTORATION', 'Applying punctuation and letter case restoration...')
exe_path = path.join(scripts_dir, 'marian-decode.sh')
reu_path = path.join(temp_dir, tmp_name + '.restored.uni24k')
mdl_path = '"%s"' % ' '.join([path.join(models_dir, 'restore-%s.s%d.npz' % (src_lang, i)) for i in range(5)])
voc_path = path.join(models_dir, 'restore-%s.vocab.yml' % src_lang)
system('%s %s %s %s %s %s 500 0.0 %s' % (exe_path, marian_dir, mdl_path, voc_path, uni_path, reu_path, comp_node))
assert path.isfile(reu_path)
tmp_paths.append(reu_path)
log('RESTORATION', '...done!')
log('PREPROCESSING', 'Resegmenting output for translation...')
log('PREPROCESING', '...desegmenting output...')
exe_path = path.join(scripts_dir, 'sentencepiece-deseg.sh')
res_path = path.join(temp_dir, tmp_name + '.restored')
system('%s < %s > %s' % (exe_path, reu_path, res_path))
assert path.isfile(res_path)
tmp_paths.append(res_path)
log('PREPROCESSING', '...applying subword segmentation for translation...')
exe_path = path.join(scripts_dir, 'sentencepiece-apply.py')
reb_path = path.join(temp_dir, tmp_name + '.restored.bpe32k')
mdl_path = path.join(models_dir, 'sentencepiece.%s+%s.bpe32k.model' % tuple(sorted([src_lang, tgt_lang])))
system('%s --input %s --output %s --model %s' % (exe_path, res_path, reb_path, mdl_path))
assert path.isfile(reb_path)
tmp_paths.append(reb_path)
log('PREPROCESSING', '...done!')
log('TRANSLATION', 'Translating the processed sentences...')
exe_path = path.join(scripts_dir, 'marian-decode.sh')
trb_path = path.join(temp_dir, tmp_name + '.translated.bpe32k')
mdl_path = '"%s"' % ' '.join([path.join(models_dir, '%s-%s.s%d.npz' % (src_lang, tgt_lang, i)) for i in range(5)])
voc_path = path.join(models_dir, '%s-%s.vocab.yml' % (src_lang, tgt_lang))
system('%s %s %s %s %s %s 500 1.0 %s' % (exe_path, marian_dir, mdl_path, voc_path, reb_path, trb_path, comp_node))
assert path.isfile(trb_path)
tmp_paths.append(trb_path)
log('TRANSLATION', '...done!')
log('POSTPROCESSING', 'Generating translated subtitles...')
log('POSTPROCESSING', '...postprocessing translations...')
exe_path = path.join(scripts_dir, 'postprocess.sh')
if args.plain_text_mode:
tra_path = out_path
else:
tra_path = path.join(temp_dir, tmp_name + '.translated')
system('%s %s %s %s %s %s' % (exe_path, moses_dir, scripts_dir, tgt_lang, trb_path, tra_path))
assert path.isfile(tra_path)
if not args.plain_text_mode:
tmp_paths.append(tra_path)
log('POSTPROCESSING', '...fitting translations into subtitle segments...')
exe_path = path.join(subalign_dir, 'mt2srt')
system('%s -n %s < %s > %s' % (exe_path, inp_path, tra_path, out_path))
assert path.isfile(out_path)
log('POSTPROCESSING', '...done!')
except:
log('EXCEPTION', 'Procedure aborted due to an exception --')
log('EXCEPTION', traceback.format_exc())
finally:
for tmp_path in tmp_paths:
if path.isfile(tmp_path):
remove(tmp_path)