def bpe_processing(filenames: list[str]):
ru_sentences = []
zh_sentences = []
for filename in filenames:
with open(filename, "r") as f:
for line in f:
ru, zh = line.split(" ||| ")
ru_sentences.append(ru)
zh_sentences.append(zh.replace(" ", ""))
bpe = {}
learn_bpe(StringIO("\n".join(ru_sentences)),
open('bpe_rules.ru', 'w'),
num_symbols=8000)
bpe["ru"] = BPE(open('./bpe_rules.ru'))
learn_bpe(StringIO("\n".join(zh_sentences)),
open('bpe_rules.zh', 'w'),
num_symbols=8000)
bpe["zh"] = BPE(open('./bpe_rules.zh'))
with open("token_map.txt", "w") as f:
for ru, zh in zip(ru_sentences, zh_sentences):
ru_tokens = bpe["ru"].process_line(ru.strip())
zh_tokens = bpe["zh"].process_line(zh.strip())
ru_map = ru_token_map(ru_tokens)
zh_map = zh_token_map(zh_tokens)
print(*ru_map, "|||", *zh_map, file=f)
print(ru_tokens + " ||| " + zh_tokens)
def finalize(self, frequencies, num_symbols=30000, minfreq=2):
"""Build the codecs.
:param: dictionary of (token: frequency) pairs
:param num_symbols: Number of BPE symbols. Recommend 30000-40000.
If <= 0, default 30000 will be used.
:param minfreq: Minimum frequency of a token before forced BPE
decomposition. If <= 0 will use subword-nmt default of 2.
"""
if hasattr(self, 'bpe'):
# we already finalized the codecs
return False
print('Dictionary: saving bpe codecs to {}'.format(self.codecs))
dictionary = ("{} {}".format(k, v) for k, v in frequencies.items())
if num_symbols <= 0:
num_symbols = 30000
if minfreq <= 0:
minfreq = 2
with open(self.codecs, 'w') as outstream:
learn_bpe.learn_bpe(
dictionary,
outstream,
num_symbols=num_symbols,
min_frequency=minfreq,
is_dict=True,
)
self._load_from_codecs()
return True
def subword_gen(infile, outfile, num_symbols):
infile_stream = codecs.open(infile, encoding='utf-8')
outfile_stream = codecs.open(outfile, 'w', encoding='utf-8')
learn_bpe(infile_stream,
outfile_stream,
num_symbols,
is_dict=False,
total_symbols=True)
def build_vocab(imgs, params):
# count up the number of words
captions = []
for img in imgs:
for sent in img['sentences']:
captions.append(' '.join(sent['tokens']))
captions = '\n'.join(captions)
all_captions = tempfile.NamedTemporaryFile(delete=False)
all_captions.close()
with open(all_captions.name, 'w') as txt_file:
txt_file.write(captions)
#
codecs_output = tempfile.NamedTemporaryFile(delete=False)
codecs_output.close()
with codecs.open(codecs_output.name, 'w', encoding='UTF-8') as output:
learn_bpe.learn_bpe(codecs.open(all_captions.name, encoding='UTF-8'),
output, params['symbol_count'])
with codecs.open(codecs_output.name, encoding='UTF-8') as codes:
bpe = apply_bpe.BPE(codes)
tmp = tempfile.NamedTemporaryFile(delete=False)
tmp.close()
tmpout = codecs.open(tmp.name, 'w', encoding='UTF-8')
for _, img in enumerate(imgs):
img['final_captions'] = []
for sent in img['sentences']:
txt = ' '.join(sent['tokens'])
txt = bpe.segment(txt).strip()
img['final_captions'].append(txt.split(' '))
tmpout.write(txt)
tmpout.write('\n')
if _ < 20:
print(txt)
tmpout.close()
tmpin = codecs.open(tmp.name, encoding='UTF-8')
vocab = learn_bpe.get_vocabulary(tmpin)
vocab = sorted(vocab.keys(), key=lambda x: vocab[x], reverse=True)
# Always insert UNK
print('inserting the special UNK token')
vocab.append('UNK')
print('Vocab size:', len(vocab))
os.remove(all_captions.name)
with open(codecs_output.name, 'r') as codes:
bpe = codes.read()
os.remove(codecs_output.name)
os.remove(tmp.name)
return vocab, bpe
def __learn(self):
"""
Train a BPE.
:trainfile: a file path which the model will learn.
:codesfile: the output codes file.
:num_symbols: number of vocabulary.
:min_frequency: min frequency of the word.
"""
trainfile = codecs.open(self.trainfile, encoding='utf-8')
codesfile = codecs.open(self.codesfile, mode='w', encoding='utf-8')
learn_bpe(trainfile, codesfile, self.num_symbols, self.min_frequency)
self.__open_bpe()
def learn_bpe_function(raw_train_file, bpe_codes_file):
parser = learn_bpe.create_parser()
args = parser.parse_args(
["--input", raw_train_file, "--output", bpe_codes_file])
args.output = codecs.open(args.output.name, 'w', encoding='utf-8')
args.input = codecs.open(args.input.name, encoding='utf-8')
learn_bpe.learn_bpe(args.input,
args.output,
args.symbols,
args.min_frequency,
args.verbose,
is_dict=args.dict_input,
total_symbols=args.total_symbols)
def build_wikitext_bpe_encoder(
special_tokens: Optional[Sequence[str]] = None) -> BPEEncoder:
regex_tokenizer = RegexTokenizer()
def tokenize_with_regex(text: str) -> Iterable[str]:
document = regex_tokenizer.apply(text)
for token in document:
if token.number:
yield TOKEN_FOR_NUMBERS
else:
yield str(token)
def wikitext_tokens(tokenizer: Callable[[str], Iterable[str]],
description: str):
train_tokens = read_wikitext_file(TRAINING_SET_NAME)
all_lines = train_tokens.splitlines()
for line in tqdm.tqdm(all_lines, desc=description):
yield from tokenizer(line)
vocabulary_file = io.StringIO('\n'.join(
'{} {}'.format(word, counter) for word, counter in build_vocabulary(
wikitext_tokens(tokenize_with_regex, 'Building vocabulary'))))
with io.StringIO() as file_with_merges:
print('Learning BPE...', flush=True, end='')
learn_bpe(vocabulary_file,
file_with_merges,
NUM_BPE_MERGES,
min_frequency=3,
verbose=False,
is_dict=True,
total_symbols=False)
file_with_merges.seek(0)
print('Done', flush=True)
merges = BPEMerges.load_from_file(file_with_merges)
bpe_tokenizer = BPETokenizer(merges,
tokenize_with_regex,
mark_sequence_edges=True)
bpe_vocabulary = build_vocabulary(
wikitext_tokens(bpe_tokenizer.apply, 'Building BPE vocabulary'))
print('BPE Vocabulary size:', len(bpe_vocabulary))
bpe_vocabulary_file = io.StringIO('\n'.join(
'{} {}'.format(word, counter) for word, counter in bpe_vocabulary))
bpe_encoder = BPEEncoder(bpe_tokenizer,
bpe_vocabulary_file,
special_tokens=special_tokens)
return bpe_encoder
def fix_file(self, corpus, pair, locale_code, src_file, target_file,
action):
"""learn and apply BPE on the whole file
this will never change the actual file and always return an empty set
"""
debug(f" -[{pair}/{locale_code}]: processing {src_file} now!")
learn_bpe(infile=open(src_file),
outfile=open(self.code_files[pair][locale_code], "w"),
verbose=self.verbose,
num_symbols=self.n_symbols,
min_frequency=self.min_frequency)
copyfile(src_file, target_file)
return set()
def finalize(self,
frequencies: Dict[str, int],
num_symbols: int = 30000,
minfreq: int = 2) -> bool:
"""
Build the codecs.
:param frequencies:
dictionary of (token: frequency) pairs
:param num_symbols:
Number of BPE symbols. Recommend 30000-40000. If <= 0, default
30000 will be used.
:param minfreq:
Minimum frequency of a token before forced BPE decomposition. If <=
0 will use subword-nmt default of 2.
:return did_finalize:
return whether codecs are finalized this call.
"""
if hasattr(self, 'bpe'):
# we already finalized the codecs
return False
logging.debug(f'Saving bpe codecs to {self.codecs}')
dictionary = ("{} {}".format(k, v) for k, v in frequencies.items())
if num_symbols <= 0:
num_symbols = 30000
if minfreq <= 0:
minfreq = 2
codec_dir, _ = os.path.split(self.codecs)
PathManager.mkdirs(codec_dir)
with PathManager.open(self.codecs, 'w', encoding='utf-8') as outstream:
learn_bpe.learn_bpe(
dictionary,
outstream,
num_symbols=num_symbols,
min_frequency=minfreq,
is_dict=True,
)
self._load_from_codecs()
return True
def train_bpe(config):
print('Start BPE training...')
from subword_nmt.learn_bpe import main as learn_bpe
train = json.load(open(config.train_file, 'r'))
train_texts = []
for p in train['data'][0]['paragraphs']:
train_texts.append(
preprocess_string(' '.join(word_tokenize(p['context'])),
remove_unicode=config.remove_unicode))
for qas in p['qas']:
train_texts.append(
preprocess_string(' '.join(word_tokenize(qas['question'])),
remove_unicode=config.remove_unicode))
learn_bpe(train_texts,
outfile=open(config.bpe_codes_file, 'w'),
num_symbols=config.bpe_merges_count)
print('BPE trained. BPE codes saved to {}'.format(config.bpe_codes_file))
def create_train_bpe(train_loc, bpe_voc=['en', 'ru'], num_symbols=10000):
"""
args:
train_loc: location of train.lang files with previously tokenized data
returns:
write train.bpe.lang files into train_loc
"""
# build and apply bpe vocs
bpe = {}
for lang in bpe_voc:
print("Learning BPE...")
learn_bpe(open(train_loc + 'train.' + lang),
open(train_loc + 'bpe_rules.' + lang, 'w'),
num_symbols=num_symbols)
bpe[lang] = BPE(open(train_loc + 'bpe_rules.' + lang))
print("Writing train files...")
with open(train_loc + 'train.bpe.' + lang, 'w') as f_out:
for line in open(train_loc + 'train.' + lang):
f_out.write(bpe[lang].process_line(line.strip()) + '\n')
def train_subword_model(src_text, trg_text, nb_symbols=10000):
# create text content with source and target text
content = []
content.extend(src_text)
content.extend(trg_text)
bpe_model_io = io.StringIO()
src_vocab_io = io.StringIO()
trg_vocab_io = io.StringIO()
# 1. Learn BPE model on both source and target text
# 1.1 cat {train_file}.L1 {train_file}.L2 | subword-nmt learn-bpe -s {num_operations} -o {codes_file}
# 1.2 subword-nmt apply-bpe -c {codes_file} < {train_file}.L1 | subword-nmt get-vocab > {vocab_file}.L1
# 1.3 subword-nmt apply-bpe -c {codes_file} < {train_file}.L2 | subword-nmt get-vocab > {vocab_file}.L2
# 1.1 learn_bpe(args.input, args.output, args.symbols, args.min_frequency, args.verbose, is_dict=args.dict_input, total_symbols=args.total_symbols))
learn_bpe(content, bpe_model_io, nb_symbols, 0, False, False, False)
# 1.2
src_text_tok = apply_bpe(bpe_model_io, src_text, merges=nb_symbols)
get_vocab(src_text_tok, src_vocab_io)
src_vocab_io.seek(0)
src_vocab = read_vocabulary(src_vocab_io, 0)
# 1.3
trg_text_tok = apply_bpe(bpe_model_io, trg_text, merges=nb_symbols)
get_vocab(trg_text_tok, trg_vocab_io)
trg_vocab_io.seek(0)
trg_vocab = read_vocabulary(trg_vocab_io, 0)
# 3. Re-apply BPE with the obtained vocabulary
# subword-nmt apply-bpe -c {codes_file} --vocabulary {vocab_file}.L1 --vocabulary-threshold 50 < {train_file}.L1 > {train_file}.BPE.L1
src_text_tok = apply_bpe(bpe_model_io, src_text, vocab=src_vocab)
trg_text_tok = apply_bpe(bpe_model_io, trg_text, vocab=trg_vocab)
bpe_model = bpe_model_io.getvalue()
bpe_model_io.close()
src_vocab_io.close()
trg_vocab_io.close()
return bpe_model, src_vocab, trg_vocab, src_text_tok, trg_text_tok
def subword(self, cleaned_filepaths, overwrite):
bpe_filepath = get_bpe_path(self.experiment_name, self.merge_ops)
if self.corpora_type == 'training':
# Concatenated file necessary for BPE learning
concatenated_filepath = get_concat_path(self.file_prefix)
concatenate_files(cleaned_filepaths,
concatenated_filepath,
overwrite=overwrite)
if os.path.exists(bpe_filepath) and overwrite == False:
print(bpe_filepath, 'already exists')
else:
print('Learning BPE encoding. This may take a while.')
with open(concatenated_filepath, 'r',
encoding='utf-8') as infile, open(
bpe_filepath, 'w', encoding='utf-8') as outfile:
learn_bpe.learn_bpe(
infile, outfile, num_symbols=self.merge_ops
) # Get codecs, write codecs to outfile
print('Applying')
with open(bpe_filepath, 'r', encoding='utf-8') as codec:
bpe = apply_bpe.BPE(codec)
print('Writing bpe')
for i, lang in enumerate(self.langs):
lang_filepath = cleaned_filepaths[i]
processed_filepath = get_processed_data_path(
self.experiment_name, self.corpora_type, lang)
if overwrite == False and os.path.exists(processed_filepath):
continue
with open(lang_filepath, 'r',
encoding='utf-8') as f1, open(processed_filepath,
'w',
encoding='utf-8') as f2:
for line in f1:
f2.write(bpe.process_line(line))
if self.corpora_type == 'training':
vocab_filepath = get_vocab_path(self.experiment_name, lang)
with open(processed_filepath, 'r',
encoding='utf-8') as train_file, open(
vocab_filepath, 'w',
encoding='utf-8') as vocab_file:
get_vocab.get_vocab(train_file, vocab_file)
def learn_bpe(self, item_list, bin_file=False, from_filenames=True):
logging.info('generating bpe codes file. saving to %s' %
self.codes_file)
if from_filenames:
filenames = item_list
if isinstance(filenames, str):
filenames = [filenames]
# get combined vocabulary of all input files
full_vocab = OrderedCounter()
if bin_file:
for fname in filenames:
reader = open(fname, 'rb')
len_bytes = reader.read(8)
if not len_bytes: break # finished reading this file
str_len = struct.unpack('q', len_bytes)[0]
example_str = struct.unpack('%ds' % str_len, reader.read(str_len))[0]
example_str = example_pb2.Example.FromString(example_str)
article_text = example_str.features.feature['article'].bytes_list.value[
0].decode() # the article text was saved under the key 'article' in the data files
abstract_text = example_str.features.feature['abstract'].bytes_list.value[
0].decode() # the abstract text was saved under the key 'abstract' in the data files
full_vocab += learn_bpe.get_vocabulary(abstract2sents(article_text) + abstract2sents(abstract_text))
else:
for fname in filenames:
with codecs.open(fname, encoding='UTF-8') as f:
full_vocab += learn_bpe.get_vocabulary(f)
else:
# get combined vocabulary of all input texts
full_vocab = OrderedCounter()
full_vocab += learn_bpe.get_vocabulary(item_list)
vocab_list = ['{0} {1}'.format(key, freq)
for (key, freq) in full_vocab.items()]
# learn BPE on combined vocabulary
with codecs.open(self.codes_file, 'w', encoding='UTF-8') as output:
learn_bpe.learn_bpe(vocab_list, output, self.num_symbols,
self.min_frequency, False, is_dict=True)
self.set_bpe(self.codes_file)
def finalize(self):
"""Build the codecs"""
if self.built:
return False
self.built = True
with open(self.codecs, 'w') as outstream:
# There's a potentially more memory efficient way to do this, with
# the is_dict method able to handle <word> \t <count> format.
# It will require more sophisticated marshalling of data back and
# forth
learn_bpe.learn_bpe(
self.training_data,
outstream,
num_symbols=self.num_symbols,
min_frequency=self.minfreq,
is_dict=False,
)
self._load_from_codecs()
return True
def tokenize_corpus_hw(data='data.txt',
train_loc='./',
bpe_voc=['en', 'ru'],
num_symbols=10000):
tokenizer = WordPunctTokenizer()
with open(train_loc + 'train.' + bpe_voc[0], 'w') as f_src, \
open(train_loc + 'train.' + bpe_voc[1], 'w') as f_dst:
for line in open(data):
src_line, dst_line = line.strip().split('\t')
f_src.write(tokenize(src_line, tokenizer) + '\n')
f_dst.write(tokenize(dst_line, tokenizer) + '\n')
# build and apply bpe vocs
bpe = {}
for lang in bpe_voc:
learn_bpe(open(train_loc + 'train.' + lang),
open('bpe_rules.' + lang, 'w'),
num_symbols=num_symbols)
bpe[lang] = BPE(open(train_loc + 'bpe_rules.' + lang))
with open(train_loc + 'train.bpe.' + lang, 'w') as f_out:
for line in open(train_loc + 'train.' + lang):
f_out.write(bpe[lang].process_line(line.strip()) + '\n')
def learn_bpe(self, item_list, from_filenames=True):
logging.info('generating bpe codes file. saving to %s' %
self.codes_file)
# get vocabulary at word level (before bpe)
def segment_words(line):
return _segment_words(line, self.pre_tokenize)
vocab_words = _get_vocabulary(item_list,
from_filenames=from_filenames,
segment=segment_words)
vocab_list = [
'{0} {1}'.format(key, freq) for (key, freq) in vocab_words.items()
]
# learn BPE on combined vocabulary
with codecs.open(self.codes_file, 'w', encoding='UTF-8') as output:
learn_bpe.learn_bpe(vocab_list,
output,
num_symbols=self.num_symbols,
min_frequency=self.min_frequency,
verbose=False,
is_dict=True,
total_symbols=self.total_symbols)
self.set_bpe(self.codes_file)
def __init__(self,
elements,
prune,
max_num,
start=True,
stop=True,
pad=True,
unk=True,
rule=False,
bpe=-1):
self.start = start
self.stop = stop
self.codes = None
vocab = Counter()
self.max_num = max_num
self.itos = []
self.stoi = {}
if pad:
self.addSymbol('<blank>')
if unk:
self.addSymbol('<unk>')
if start:
self.addSymbol('<s>')
if stop:
self.addSymbol('</s>')
self.rule = rule
if rule: # Adding these for both ATIS and CONCODE. Extra things in the vocab are ok.
for pre_terminal in CDDataset.pre_terminal_symbols:
self.addSymbol(CDDataset._unk_rule_from_Nt(pre_terminal))
if bpe >= 0:
self.codes = learn_bpe.learn_bpe(elements, bpe,
0) # last is min freq
b = apply_bpe.BPE(self.codes)
elements = b.segment_tokens(elements)
for w in elements:
vocab[w] += 1
if bpe >= 0:
print('Vocab size {}'.format(len(vocab)))
# prune low frequency words
max_vocab = self.max_num if not rule else 100000000000
for (w, f) in vocab.most_common(max_vocab):
if ((rule == False and f > prune)
or (rule == True and not CDDataset._is_terminal_rule(w))
or (rule == True and CDDataset._is_terminal_rule(w)
and len(self.itos) < self.max_num)
or w.endswith("_concodeNT")):
word = w.replace('concodeclass_',
'').replace('concodefunc_', '')
self.itos.append(word)
self.stoi[word] = len(self.itos) - 1
else: #map everything else to unk
if rule:
# We need the right kind of UNK rule here
mapped_to_known_unk = False
for pre_terminal in CDDataset.pre_terminal_symbols:
if pre_terminal in w:
self.stoi[w] = self.stoi[
CDDataset._unk_rule_from_Nt(pre_terminal)]
mapped_to_known_unk = True
break
if not mapped_to_known_unk:
# An unk type we dont know about. Investigate.
import ipdb
ipdb.set_trace()
# For next_rules, we cannot have any other type of unk
self.stoi[w] = self.stoi['<unk>']
else:
self.stoi[w] = self.stoi['<unk>']
def get_dict(args):
input_args = [
args.train_prefix + '.' + args.source_lang,
args.train_prefix + '.' + args.target_lang
]
path = '/Users/chaofeng/atmt/assignment3/baseline/raw_data_back20000/'
vocab_args = [
path + "dict" + '.' + args.source_lang,
path + "dict" + '.' + args.target_lang
]
#input_args = [path+"train.de", path+"train.en"]
#vocab_args = [path+"dict.de", path+"dict.en"]
separator = '@@'
symbols = 10000
min_frequency = 1
output = path + "code"
# read/write files as UTF-8
input = [codecs.open(f, encoding='UTF-8') for f in input_args]
vocab = [codecs.open(f, mode='w', encoding='UTF-8') for f in vocab_args]
# get combined vocabulary of all input texts
full_vocab = Counter()
for f in input:
full_vocab += learn_bpe.get_vocabulary(f)
f.seek(0)
vocab_list = [
'{0} {1}'.format(key, freq) for (key, freq) in full_vocab.items()
]
# learn BPE on combined vocabulary
with codecs.open(output, mode='w', encoding='UTF-8') as file:
learn_bpe.learn_bpe(vocab_list, file, symbols, min_frequency)
with codecs.open(output, encoding='UTF-8') as codes:
bpe = apply_bpe.BPE(codes, separator=separator)
# apply BPE to each training corpus and get vocabulary
for train_file, vocab_file in zip(input, vocab):
tmp = tempfile.NamedTemporaryFile(delete=False)
tmp.close()
tmpout = codecs.open(tmp.name, 'w', encoding='UTF-8')
train_file.seek(0)
for line in train_file:
tmpout.write(bpe.segment(line).strip())
tmpout.write('\n')
tmpout.close()
tmpin = codecs.open(tmp.name, encoding='UTF-8')
vocab = learn_bpe.get_vocabulary(tmpin)
tmpin.close()
os.remove(tmp.name)
for key, freq in sorted(vocab.items(),
key=lambda x: x[1],
reverse=True):
vocab_file.write("{0} {1}\n".format(key, freq))
return vocab_args, output
def main(argv):
import argparse
from io import StringIO
# argument parsing
parser = argparse.ArgumentParser(
formatter_class=argparse.RawDescriptionHelpFormatter,
description="adapts an UD dataset to context-sensitive lemmatization")
io_group = parser.add_argument_group('io')
io_group.add_argument("--input", help="file to be transformed", type=str)
io_group.add_argument("--output",
help="output source and target files",
nargs='+',
type=str,
default=None)
io_group.add_argument(
"--transform_appendix",
help=
"appendix to transform folder name (e.g. SLURM_JOB_ID or datetime)",
type=str,
default=None)
io_group.add_argument(
"--word_column_index",
help="index of word column in the file (zero-indexed)",
type=int,
default=0)
io_group.add_argument(
"--lemma_column_index",
help="index of lemma column in the file (zero-indexed)",
type=int,
default=1)
io_group.add_argument(
"--tag_column_index",
help="index of tag column in the file (zero-indexed)",
type=int,
default=2)
io_group.add_argument('--debug',
dest='debug',
help="debug mode prints target/source file to stdout"
" instead of writing to the file system",
action='store_true')
io_group.add_argument('--overwrite', dest='overwrite', action='store_true')
io_group.add_argument(
"--print_file",
help="which file to output (source/target) in debug mode",
choices=['source', 'target'],
type=str,
default=defaults["PRINT_FILE"])
repr_group = parser.add_argument_group('representation')
repr_group.add_argument(
"--mode",
help="mode of transformation",
choices=['word_and_context', 'sentence_to_sentence'],
type=str,
default=defaults["MODE"])
repr_group.add_argument("--word_unit",
help="type of word representation",
choices=['char', 'word', 'bpe'],
type=str,
default=defaults["WORD_UNIT"])
repr_group.add_argument("--tag_unit",
help="type of tag representation",
choices=['char', 'word'],
type=str,
default=defaults["TAG_UNIT"])
repr_group.add_argument("--context_unit",
help="type of context representation",
choices=['char', 'bpe', 'word'],
type=str,
default=defaults["CONTEXT_UNIT"])
repr_group.add_argument(
"--char_n_gram_mode",
help="size of char-n-grams (only used if --context_unit is char"
"or if --mode is sentence_to_sentence and --word_unit is char, default: %(default)s)",
type=int,
default=defaults["CHAR_N_GRAM"])
repr_group.add_argument(
"--sentence_size",
help="maximum size of sentence in sentence_to_sentence mode",
type=int,
default=argparse.SUPPRESS)
repr_group.add_argument('--tag_first',
action='store_true',
help="if true tags will be printed before "
"words in source and target files")
ctx_group = parser.add_argument_group('context')
ctx_group.add_argument(
"--context_size",
help=
"size of context representation (in respective units) on left and right (0 to use full span)",
type=int,
default=defaults["CONTEXT_SIZE"])
ctx_group.add_argument(
"--context_char_size",
help=
"size of context representation (in characters) on left and right (0 to use full span, has precedence over --context_size)",
type=int,
default=argparse.SUPPRESS)
ctx_group.add_argument(
"--context_span",
help=
"maximum span of a word in number of sentences on left and right of the sentence of the word, default: %(default)s))",
type=int,
default=defaults["CONTEXT_SPAN"])
ctx_group.add_argument(
"--context_tags",
help="whether and where to include tag in the context",
choices=['none', 'left'],
type=str,
default=defaults["CONTEXT_TAGS"])
bpe_group = parser.add_argument_group('bpe')
bpe_group.add_argument(
"--bpe_operations",
help="number of BPE merge operations to be learned "
"(corresponds to number of symbols/char-n-grams/codes)",
type=int,
default=defaults["BPE_OPERATIONS"])
bpe_group.add_argument(
"--bpe_codes_path",
help=
"full file path to export BPE codes to or to read them from if available",
type=str,
default=None)
boundary_group = parser.add_argument_group('boundaries')
boundary_group.add_argument(
"--left_context_boundary",
help="left context boundary special symbol (default: %(default)s)",
type=str,
default=defaults["LEFT_CONTEXT_BOUNDARY"])
boundary_group.add_argument(
"--example_boundary",
help="example boundary special symbol (default: %(default)s)",
type=str,
default=defaults["EXAMPLE_BOUNDARY"])
boundary_group.add_argument(
"--right_context_boundary",
help="right context boundary special symbol (default: %(default)s)",
type=str,
default=defaults["RIGHT_CONTEXT_BOUNDARY"])
boundary_group.add_argument(
"--word_boundary",
help="word boundary special symbol (default: %(default)s)",
type=str,
default=defaults["WORD_BOUNDARY"])
boundary_group.add_argument(
"--tag_boundary",
help="tag boundary special symbol (default: %(default)s)",
type=str,
default=defaults["TAG_BOUNDARY"])
boundary_group.add_argument(
'--subword_separator',
type=str,
default=defaults["SUBWORD_SEPARATOR"],
metavar='STR',
help=
"separator between non-final BPE subword units (default: '%(default)s'))"
)
args = parser.parse_args(argv)
# determining input
if args.input is None:
if args.output is None:
raise ValueError(
"Can't decide how to name the transformation because you feed from stdin. Use --output to specify path."
)
args.input = sys.stdin
else:
input_folders = re.split("/+|\\\\+", args.input)
if len(input_folders) < 2:
raise ValueError(
"Can't decide how to name the transformation. Use --output to specify path."
)
else:
input_folder = input_folders[-2]
input_filename = input_folders[-1].split(".")[0]
# determining output
if not args.debug:
if args.output is None or (type(args.output) is list
and len(args.output) == 1):
transform_folder = "{}_{}_{}{}{}{}{}{}{}{}{}".format(
input_folder, "w" + args.word_unit, "t" + args.tag_unit,
("_" + (("{:02d}u".format(args.context_size))
if not hasattr(args, 'context_char_size') else
(str(args.context_char_size) + "ch")))
if args.mode == 'word_and_context' else "",
("_" + ("c" + args.context_unit))
if args.mode == "word_and_context" else "",
"_n{}".format(args.char_n_gram_mode) if
((args.mode == 'word_and_context'
and args.context_unit == "char") or
(args.mode == 'sentence_to_sentence'
and args.word_unit == 'char')) else "",
"_n{}".format(args.bpe_operations) if
((args.mode == 'word_and_context'
and args.context_unit == "bpe") or
(args.mode == 'sentence_to_sentence'
and args.word_unit == 'bpe')) else "",
"_ct" if args.context_tags == 'left' else "",
"_tf" if args.tag_first else "",
"_cs{}".format(args.context_span)
if args.mode == 'word_and_context' else "",
".{}".format(args.transform_appendix)
if args.transform_appendix else "")
if args.output is None or not args.output or '' in args.output:
full_transform_folder_path = os.path.join(
os.path.dirname(os.path.abspath(__file__)), 'input',
args.mode, transform_folder)
else:
full_transform_folder_path = os.path.join(
args.output[0], transform_folder)
os.makedirs(full_transform_folder_path, exist_ok=True)
output_source_path = os.path.join(
full_transform_folder_path, '{}_source'.format(input_filename))
output_target_path = os.path.join(
full_transform_folder_path, '{}_target'.format(input_filename))
print(full_transform_folder_path)
if not args.overwrite and (os.path.isfile(output_source_path)
or os.path.isfile(output_target_path)):
raise ValueError(
"Output files for {} already exist in {}. Pass --overwrite or delete them."
.format(input_filename, full_transform_folder_path))
# truncate output files or create them anew
open(output_source_path, 'w').close()
open(output_target_path, 'w').close()
else:
if len(args.output) != 2:
raise ValueError(
"You must specify full target and source output file paths (including file name)."
)
full_transform_folder_path = None
output_source_path = args.output[0]
output_target_path = args.output[1]
print(args, file=sys.stderr)
# loading file
infile_df = preprocess_dataset_for_train(
pd.read_csv(args.input,
sep='\s+',
names=cols,
usecols=[
args.word_column_index, args.lemma_column_index,
args.tag_column_index
],
skip_blank_lines=False,
comment='#',
quoting=3)[cols])
infile_df = infile_df.reset_index(drop=True)
# subword preprocessing of the input file
if (args.mode == 'word_and_context' and args.context_unit == 'char') or (
args.mode == 'sentence_to_sentence' and args.word_unit == 'char'):
# uses subword-nmt to segment text into chargrams
from types import SimpleNamespace
import numpy as np
sys.path.append(
os.path.join(os.path.dirname(__file__), '..', 'subword-nmt'))
from subword_nmt.segment_char_ngrams import segment_char_ngrams
def segment(col):
subword_nmt_output = StringIO()
segment_char_ngrams(
SimpleNamespace(input=infile_df[col].dropna().astype(str),
vocab={},
n=args.char_n_gram_mode,
output=subword_nmt_output,
separator=args.subword_separator))
subword_nmt_output.seek(0)
infile_df.loc[infile_df[col].notnull(), [col]] = np.array([
line.rstrip(' \t\n\r') for line in subword_nmt_output
])[:, np.newaxis]
subword_nmt_output.truncate(0)
segment("word")
if args.mode == 'sentence_to_sentence' and args.word_unit == 'char':
segment("lemma")
elif (args.mode == 'word_and_context' and args.context_unit == 'bpe') or (
args.mode == 'sentence_to_sentence' and args.word_unit == 'bpe'):
if args.bpe_codes_path:
bpe_codes_file_path = args.bpe_codes_path
elif full_transform_folder_path:
bpe_codes_file_path = os.path.join(full_transform_folder_path,
"bpe_codes")
else:
raise ValueError(
"Specify transformation output folder or bpe output file path in order to export BPE codes."
)
# BPE processing
sys.path.append(
os.path.join(os.path.dirname(__file__), '..', 'subword-nmt'))
from subword_nmt.apply_bpe import BPE
# only learn BPEs if bpe_codes file is unavailable
if not os.path.isfile(bpe_codes_file_path):
# as advised in subword-nmt's readme, we learn BPE jointly on the sources and targets
# because they share an alphabet (for the most part)
from subword_nmt.learn_bpe import learn_bpe
bpe_codes = open(bpe_codes_file_path, "w", encoding='utf-8')
learn_bpe(
infile_df[["word", "lemma"]].dropna().astype(str).to_string(
index=False, header=False).splitlines(), bpe_codes,
args.bpe_operations)
bpe_codes.close()
with open(bpe_codes_file_path, encoding='utf-8') as bpe_codes:
# apply all merge operations, without vocabulary and glossaries
bpe = BPE(bpe_codes, -1, args.subword_separator, [], [])
infile_df.loc[infile_df["word"].notnull(), ["word", "lemma"]] = \
infile_df.loc[infile_df["word"].notnull(), ["word", "lemma"]].applymap(bpe.process_line)
sentence_indices = pd.isna(infile_df).all(axis=1)
sentence_end_iterator = (i for i, e in sentence_indices.to_dict().items()
if e is True)
# per-mode specific processing
if args.mode == 'word_and_context':
sentence_dfs = []
transformer_args = {
'word_unit':
args.word_unit,
'tag_unit':
args.tag_unit,
'context_size':
args.context_size,
'context_char_size':
args.context_char_size
if hasattr(args, 'context_char_size') else None,
'context_tags':
args.context_tags,
'tag_first':
args.tag_first,
'left_context_boundary':
args.left_context_boundary,
'tag_boundary':
args.tag_boundary,
'right_context_boundary':
args.right_context_boundary,
'word_boundary':
args.word_boundary,
'example_boundary':
args.example_boundary,
'subword_separator':
args.subword_separator
}
transformer = Transformer(**transformer_args)
sentence_start = 0
for sentence_end in sentence_end_iterator:
sentence_dfs.append(infile_df.loc[sentence_start:sentence_end - 1])
sentence_start = sentence_end + 1
for sentence_df_idx, sentence_df in enumerate(sentence_dfs):
# adds additional context according to CONTEXT_SPAN to sentence below
lc_df = pd.DataFrame()
rc_df = pd.DataFrame()
if args.context_span > 0:
lc_df_ls = sentence_dfs[
max(sentence_df_idx -
args.context_span, 0):sentence_df_idx]
if lc_df_ls:
lc_df = pd.concat(lc_df_ls)
rc_df_ls = sentence_dfs[
sentence_df_idx +
1:min(sentence_df_idx + 1 + args.context_span,
len(sentence_dfs) - 1)]
if rc_df_ls:
rc_df = pd.concat(rc_df_ls)
output_source_lines, output_target_lines = transformer.process_sentence(
sentence_df, lc_df, rc_df)
if not (output_source_lines or output_target_lines):
continue
if args.debug:
if args.print_file == 'source':
print("\n".join(output_source_lines))
else:
print("\n".join(output_target_lines))
else:
with open(output_source_path, 'a+', encoding='utf-8') as outsourcefile, \
open(output_target_path, 'a+', encoding='utf-8') as outtargetfile:
outsourcefile.write("\n".join(output_source_lines) + "\n")
outtargetfile.write("\n".join(output_target_lines) + "\n")
elif args.mode == 'sentence_to_sentence':
sentence_start = 0
if args.example_boundary is not None:
pos_close_tag = args.example_boundary.find('<') + 1
open_tag = args.example_boundary
close_tag = open_tag[:pos_close_tag] + '/' + open_tag[
pos_close_tag:]
for sentence_end in sentence_end_iterator:
output_source_line = [open_tag]
output_target_line = [open_tag]
last_split_pos = 0
for sentence_idx in range(sentence_start, sentence_end):
subwords = re.split("\s*{}\s*".format(args.subword_separator),
infile_df.at[sentence_idx, "word"])
lemma = re.split("\s*{}\s*".format(args.subword_separator),
infile_df.at[sentence_idx, "lemma"])
tag = infile_df.at[sentence_idx, "tag"]
# inserts a breaking point at the position before this word+tag were inserted in both the source and the target
output_source_insertion_point = len(output_source_line)
output_target_insertion_point = len(output_target_line)
output_source_line.extend(subwords)
output_source_line.append(args.word_boundary)
if not args.tag_first:
output_target_line.extend(lemma)
output_target_line.append(args.tag_boundary)
if args.tag_unit == "word":
output_target_line.append(tag)
else:
output_target_line.extend(tag)
if args.tag_first:
output_target_line.append(args.tag_boundary)
output_target_line.extend(lemma)
output_target_line.append(args.word_boundary)
# if the target translation overflows (target sentence is guaranteed to be longer in size)
# sanity check: awk 'NF > 50 { print NR, NF }' dev_source | wc -l
last_split_size = len(output_target_line) - last_split_pos
if hasattr(args, 'sentence_size'
) and last_split_size > args.sentence_size:
output_source_line.insert(output_source_insertion_point,
defaults["SENTENCE_SPLIT_TAG"])
output_target_line.insert(output_target_insertion_point,
defaults["SENTENCE_SPLIT_TAG"])
# set to 1, for internal slices to account for the opening <w> sentence boundary tag
last_split_pos = output_target_insertion_point
sentence_start = sentence_end + 1
output_source_line.pop()
output_target_line.pop()
output_source_line.append(close_tag)
output_target_line.append(close_tag)
assert output_source_line.count(defaults["SENTENCE_SPLIT_TAG"]) == output_target_line.count(defaults["SENTENCE_SPLIT_TAG"]), \
"Sentence splits in sentence_to_sentence mode are wrong."
# split sentences if necessary
split_cond = True
end_source_line_split_pos = 0
end_target_line_split_pos = 0
while split_cond:
try:
start_source_line_pos = end_source_line_split_pos
start_target_line_pos = end_target_line_split_pos
end_source_line_split_pos = output_source_line.index(
defaults["SENTENCE_SPLIT_TAG"],
end_source_line_split_pos) + 1
end_target_line_split_pos = output_target_line.index(
defaults["SENTENCE_SPLIT_TAG"],
end_target_line_split_pos) + 1
except ValueError:
split_cond = False
end_source_line_split_pos = len(output_source_line) + 1
end_target_line_split_pos = len(output_target_line) + 1
output_source_line_split = output_source_line[
start_source_line_pos:end_source_line_split_pos - 1]
output_target_line_split = output_target_line[
start_target_line_pos:end_target_line_split_pos - 1]
if output_source_line_split[-1] == defaults["WORD_BOUNDARY"]:
output_source_line_split[-1] = close_tag
if output_source_line_split[0] != open_tag:
output_source_line_split.insert(0, open_tag)
if output_target_line_split[-1] == defaults["WORD_BOUNDARY"]:
output_target_line_split[-1] = close_tag
if output_target_line_split[0] != open_tag:
output_target_line_split.insert(0, open_tag)
if args.debug:
if args.print_file == 'source':
print(" ".join(output_source_line_split))
else:
print(" ".join(output_target_line_split))
print("\n")
else:
with open(output_source_path, 'a+', encoding='utf-8') as outsourcefile, \
open(output_target_path, 'a+', encoding='utf-8') as outtargetfile:
outsourcefile.write(
" ".join(output_source_line_split) + "\n")
outtargetfile.write(
" ".join(output_target_line_split) + "\n")
def main(args):
corpus_path_list = args.corpus
if args.save_dir is None:
args.save_dir = args.model
for corpus_path in corpus_path_list:
if not os.path.exists(corpus_path):
raise ValueError(
'The path="{}" provided by --corpus does not exist!'.format(
corpus_path))
print('Learn the "{}"s subword model based on {}.'.format(
args.model, args.corpus))
os.makedirs(args.save_dir, exist_ok=True)
model_prefix = os.path.join(args.save_dir, args.model)
print('Save the subword model to {}.model'.format(model_prefix))
print('Save the vocabulary to {}.vocab'.format(model_prefix))
print()
print('------- Start Training -------------')
special_tokens_kv = OrderedDict()
if not args.disable_unk:
special_tokens_kv['unk_token'] = Vocab.UNK_TOKEN
if not args.disable_bos:
special_tokens_kv['bos_token'] = Vocab.BOS_TOKEN
if not args.disable_eos:
special_tokens_kv['eos_token'] = Vocab.EOS_TOKEN
if not args.disable_pad:
special_tokens_kv['pad_token'] = Vocab.PAD_TOKEN
# split custom special tokens
if args.model in ['yttm'] and len(args.custom_special_tokens) > 0:
raise ValueError(
'model {} do not support custom_special_tokens'.format(args.model))
additional_custom_special_token = OrderedDict()
for custom_special_token in args.custom_special_tokens:
kv = custom_special_token.split('=')
if not len(kv) == 2:
raise ValueError(
'parameter {} has wrong format'.format(custom_special_token))
k, v = kv[0], kv[1]
if k in special_tokens_kv:
warnings.warn(
f'There are overlaps between the custom special tokens and the'
f' unk, bos, eos, pad tokens. Currently, we will overwrite the '
f'default tokens. We will overwrite "{k}" to "{v}"')
special_tokens_kv[k] = v
additional_custom_special_token[k] = v
if args.model == 'hf_wordpiece':
tokenizers = try_import_huggingface_tokenizers()
if 'unk_token' not in special_tokens_kv or special_tokens_kv[
'unk_token'] != '[UNK]':
# TODO, HF Tokenizer must have the unk token.
special_tokens_kv['unk_token'] = '[UNK]'
if parse_version(tokenizers.__version__) < parse_version('0.8'):
# The older version of Tokenizers
# hf_wordpiece must contain mask, cls and sep tokens
# the custom defined mask,cls,sep can overwrite the default settings
if 'mask_token' not in special_tokens_kv:
special_tokens_kv['mask_token'] = Vocab.MASK_TOKEN
if 'cls_token' not in special_tokens_kv:
special_tokens_kv['cls_token'] = Vocab.CLS_TOKEN
if 'sep_token' not in special_tokens_kv:
special_tokens_kv['sep_token'] = Vocab.SEP_TOKEN
special_tokens = list(special_tokens_kv.values())
print('special tokens: ' + ', '.join(special_tokens))
vocab = []
if args.model == 'spm':
try_import_sentencepiece()
import sentencepiece as spm
corpus_path = ','.join(corpus_path_list)
script = '--input={} --model_prefix={} --vocab_size={} --character_coverage={} --input_sentence_size={}' \
.format(corpus_path, model_prefix, args.vocab_size, args.coverage, args.input_sentence_size)
script += (' --unk_id=' +
str(list(special_tokens_kv.keys()).index('unk_token')))
script += (' --bos_id=' + ('-1' if args.disable_bos else str(
list(special_tokens_kv.keys()).index('bos_token'))))
script += (' --eos_id=' + ('-1' if args.disable_eos else str(
list(special_tokens_kv.keys()).index('eos_token'))))
script += (' --pad_id=' + ('-1' if args.disable_pad else str(
list(special_tokens_kv.keys()).index('pad_token'))))
if len(additional_custom_special_token) > 0:
script += (
' --control_symbols=' +
','.join(list(additional_custom_special_token.values())))
print(script)
spm.SentencePieceTrainer.Train(script)
if 'bos_token' in special_tokens_kv:
special_tokens_kv['bos_token'] = '<s>'
if 'eos_token' in special_tokens_kv:
special_tokens_kv['eos_token'] = '</s>'
# build spm vocab
spm_model = spm.SentencePieceProcessor()
spm_model.load(model_prefix + '.model')
vocab = [spm_model.id_to_piece(i) for i in range(len(spm_model))]
os.remove(model_prefix + '.vocab')
elif args.model == 'subword_nmt':
try_import_subword_nmt()
from subword_nmt import learn_bpe
corpus_path = cat_corpus(corpus_path_list)\
if len(corpus_path_list) > 1 else corpus_path_list[0]
# build model
with open(corpus_path, 'r', encoding='utf-8') as fc,\
open(model_prefix + '.model', 'w', encoding='utf-8') as fm:
learn_bpe.learn_bpe(fc,
fm,
args.vocab_size - len(special_tokens),
total_symbols=True)
# build vocab
with open(corpus_path, 'r', encoding='utf-8') as fc, \
open(model_prefix + '.model', 'r', encoding='utf-8') as fm:
vocab.extend(special_tokens)
uniq_chars_internal = set()
uniq_chars_final = set()
uniq_words = set()
for line in fc:
for word in line.strip('\r\n ').split(' '):
if word:
uniq_words.add(word)
# this code piece is same as
# https://github.com/rsennrich/subword-nmt/blob/master/subword_nmt/learn_bpe.py shows
uniq_words = [
tuple(x[:-1]) + (x[-1] + '</w>', ) for x in uniq_words
]
for word in uniq_words:
for char in word[:-1]:
uniq_chars_internal.add(char)
uniq_chars_final.add(word[-1])
# sort to ensure the same settings produce the same vocab
vocab.extend(sorted(list(uniq_chars_internal)))
vocab.extend(sorted(list(uniq_chars_final)))
fm.readline()
pair = fm.readline()
while pair:
vocab.append(pair.replace(' ', '', 1).strip())
pair = fm.readline()
if len(corpus_path_list) > 1:
os.remove(corpus_path)
elif args.model == 'yttm':
try_import_yttm()
import youtokentome as yttm
corpus_path = cat_corpus(corpus_path_list)\
if len(corpus_path_list) > 1 else corpus_path_list[0]
tokenizer = yttm.BPE.train(
data=corpus_path,
model=model_prefix + '.model',
vocab_size=args.vocab_size,
coverage=args.coverage,
n_threads=args.n_threads,
unk_id=special_tokens.index(Vocab.UNK_TOKEN),
bos_id=-1
if args.disable_bos else special_tokens.index(Vocab.BOS_TOKEN),
eos_id=-1
if args.disable_eos else special_tokens.index(Vocab.EOS_TOKEN),
pad_id=-1
if args.disable_pad else special_tokens.index(Vocab.PAD_TOKEN))
vocab = tokenizer.vocab()
if 'unk_token' in special_tokens_kv:
special_tokens_kv['unk_token'] = '<UNK>'
if 'bos_token' in special_tokens_kv:
special_tokens_kv['bos_token'] = '<BOS>'
if 'eos_token' in special_tokens_kv:
special_tokens_kv['eos_token'] = '<EOS>'
if 'pad_token' in special_tokens_kv:
special_tokens_kv['pad_token'] = '<PAD>'
if len(corpus_path_list) > 1:
os.remove(corpus_path)
elif args.model in ['hf_bpe', 'hf_bytebpe', 'hf_wordpiece']:
tokenizers = try_import_huggingface_tokenizers()
if args.model == 'hf_bpe':
split_on_whitespace_only = not args.split_punctuation
tokenizer = tokenizers.CharBPETokenizer(
lowercase=args.lowercase,
bert_normalizer=args.bert_normalizer,
split_on_whitespace_only=split_on_whitespace_only)
elif args.model == 'hf_bytebpe':
tokenizer = tokenizers.ByteLevelBPETokenizer(
lowercase=args.lowercase)
elif args.model == 'hf_wordpiece':
unk_token = special_tokens_kv.get('unk_token', None)
sep_token = special_tokens_kv.get('sep_token', None)
cls_token = special_tokens_kv.get('cls_token', None)
pad_token = special_tokens_kv.get('pad_token', None)
mask_token = special_tokens_kv.get('mask_token', None)
if args.bert_normalizer:
strip_accents = None
clean_text = True
handle_chinese_chars = True
else:
strip_accents = False
clean_text = False
handle_chinese_chars = False
tokenizer = tokenizers.BertWordPieceTokenizer(
unk_token=unk_token,
sep_token=sep_token,
cls_token=cls_token,
pad_token=pad_token,
mask_token=mask_token,
lowercase=args.lowercase,
strip_accents=strip_accents,
handle_chinese_chars=handle_chinese_chars,
clean_text=clean_text)
else:
raise NotImplementedError
tokenizer.train(corpus_path_list,
vocab_size=args.vocab_size,
show_progress=True,
special_tokens=special_tokens)
# Deal with the API change of tokenizers >= 0.8
if version.parse(tokenizers.__version__) >= version.parse('0.8'):
save_model_path = model_prefix + '.model'
tokenizer.save(save_model_path)
model_info = json.load(open(save_model_path, encoding='utf-8'))
special_tokens_in_tokenizer = model_info['added_tokens']
assert len(special_tokens_in_tokenizer) == len(special_tokens)
hf_vocab = model_info['model']['vocab']
hf_vocab_sorted = sorted(list(hf_vocab.items()),
key=lambda x: x[1])
hf_vocab_ids = [ele[1] for ele in hf_vocab_sorted]
assert min(hf_vocab_ids) == 0 and max(
hf_vocab_ids) == len(hf_vocab_ids) - 1
vocab = [ele[0] for ele in hf_vocab_sorted]
else:
tokenizer.save(args.save_dir, args.model)
# we replace the huggingface vocab file with our Vocab implementation
if args.model == 'hf_wordpiece':
hf_vocab_file = model_prefix + '-vocab.txt'
with open(hf_vocab_file, 'r', encoding='utf-8') as fv:
for line in fv:
vocab.append(line.strip())
else:
# Move the hf_${model}-merges.txt to hf_${model}.models
os.rename(
os.path.join(args.save_dir,
'{}-merges.txt'.format(args.model)),
os.path.join(args.save_dir, '{}.model'.format(args.model)))
hf_vocab_file = model_prefix + '-vocab.json'
with open(hf_vocab_file, 'r', encoding='utf-8') as fv:
vocab_kv = json.load(fv)
vocab_kv = sorted(list(vocab_kv.items()),
key=lambda x: x[1])
for kv in vocab_kv:
vocab.append(kv[0])
os.remove(hf_vocab_file)
else:
raise NotImplementedError
vocab_obj = Vocab(vocab, **special_tokens_kv)
vocab_obj.save(model_prefix + '.vocab')
print('-------- Done Training -------------')
def create_corpus(src,
trg,
en_test_sents,
filedir,
lc=False,
seed=42,
bpe_size=10000,
dev_size=1000,
test_dir="test"):
""" Create a BPE-preprocessed corpus with random train/dev/test splits. """
source_file = "{}/jw300.{}-{}.{}".format(filedir, src, trg, src)
target_file = "{}/jw300.{}-{}.{}".format(filedir, src, trg, trg)
# download
opus_reader = opustools_pkg.OpusRead(directory="JW300",
source=src,
target=trg,
write_mode="moses",
write=[source_file, target_file],
suppress_prompts=True)
opus_reader.printPairs()
# unzip
subprocess.Popen('gunzip JW300_latest_xml_{}-{}.xml.gz'.format(
src, trg).split())
# TMX file to dataframe
source = []
target = []
skip_lines = []
with open(source_file) as f:
for i, line in enumerate(f):
# skip sentences that are contained in the test set
if line.strip() not in en_test_sents:
source.append(line.strip())
else:
skip_lines.append(i)
with open(target_file) as f:
for j, line in enumerate(f):
# only add to corpus if corresponding source was not skipped
if j not in skip_lines:
target.append(line.strip())
print(
'Loaded data and skipped {} lines since contained in test set.'.format(
len(skip_lines)))
df = pd.DataFrame(zip(source, target),
columns=['source_sentence', 'target_sentence'])
# drop duplicate translations
df_pp = df.drop_duplicates()
# drop conflicting translations
df_pp.drop_duplicates(subset='source_sentence', inplace=True)
df_pp.drop_duplicates(subset='target_sentence', inplace=True)
# shuffle
df_pp = df_pp.sample(frac=1, random_state=seed).reset_index(drop=True)
# do the split between dev/test/train and create parallel corpora
num_dev_patterns = dev_size
# test data is loaded from file
# num_test_patterns = 1000
# Lower case the corpora
if lc:
df_pp["source_sentence"] = df_pp["source_sentence"].str.lower()
df_pp["target_sentence"] = df_pp["target_sentence"].str.lower()
dev = df_pp.tail(num_dev_patterns)
stripped = df_pp.drop(df_pp.tail(num_dev_patterns).index)
train_src_file = "{}/train.{}-{}.{}".format(filedir, src, trg, src)
train_trg_file = "{}/train.{}-{}.{}".format(filedir, src, trg, trg)
dev_src_file = "{}/dev.{}-{}.{}".format(filedir, src, trg, src)
dev_trg_file = "{}/dev.{}-{}.{}".format(filedir, src, trg, trg)
# tests are already created
#test_src_file = "{}/test.{}-{}.{}".format(filedir, src, trg, src)
#test_trg_file = "{}/test.{}-{}.{}".format(filedir, src, trg, trg)
stripped[["source_sentence"]].to_csv(train_src_file,
header=False,
index=False,
quotechar="",
quoting=csv.QUOTE_NONE,
escapechar="\\",
sep="§")
stripped[["target_sentence"]].to_csv(train_trg_file,
index=False,
header=False,
quotechar="",
quoting=csv.QUOTE_NONE,
escapechar="\\",
sep="§")
dev[["source_sentence"]].to_csv(dev_src_file,
index=False,
header=False,
quotechar="",
quoting=csv.QUOTE_NONE,
escapechar="\\",
sep="§")
dev[["target_sentence"]].to_csv(dev_trg_file,
index=False,
header=False,
quotechar="",
quoting=csv.QUOTE_NONE,
escapechar="\\",
sep="§")
#test[["source_sentence"]].to_csv(test_src_file, index=False, header=False, quotechar="", quoting=csv.QUOTE_NONE, escapechar="\\", sep="§")
#test[["target_sentence"]].to_csv(test_trg_file, index=False, header=False, quotechar="", quoting=csv.QUOTE_NONE, escapechar="\\", sep="§")
# train bpe (separately for src and trg)
src_bpe_file = "{}/{}-{}.{}.bpe".format(filedir, src, trg, src)
trg_bpe_file = "{}/{}-{}.{}.bpe".format(filedir, src, trg, trg)
learn_bpe.learn_bpe(codecs.open(train_src_file, encoding='utf-8'),
codecs.open(src_bpe_file, "w", encoding='utf-8'),
bpe_size)
learn_bpe.learn_bpe(codecs.open(train_trg_file, encoding='utf-8'),
codecs.open(trg_bpe_file, "w", encoding='utf-8'),
bpe_size)
# apply bpe
def bpe_process(inp, outp, codes):
codes = codecs.open(codes, encoding='utf-8')
inp = codecs.open(inp, encoding='utf-8')
outp = codecs.open(outp, "w", encoding='utf-8')
bpe = apply_bpe.BPE(codes)
for line in inp:
outp.write(bpe.process_line(line))
for split in ["train", "dev"]:
for side in [src, trg]:
bpe_process(
"{}/{}.{}-{}.{}".format(filedir, split, src, trg, side),
"{}/{}.{}-{}.bpe.{}".format(filedir, split, src, trg, side),
"{}/{}-{}.{}.bpe".format(filedir, src, trg, side))
for side in [src, trg]:
bpe_process(
"{}/{}.{}-{}.{}".format(test_dir, "test", src, trg, side),
"{}/{}.{}-{}.bpe.{}".format(filedir, "test", src, trg, side),
"{}/{}-{}.{}.bpe".format(filedir, src, trg, side))
def main(args):
corpus_path_list = args.corpus
if not os.path.exists(args.save_dir):
os.makedirs(args.save_dir)
model_prefix = os.path.join(args.save_dir, args.model)
special_tokens_kv = OrderedDict()
# unk is always required
special_tokens_kv['unk_token'] = Vocab.UNK_TOKEN
if not args.disable_bos:
special_tokens_kv['bos_token'] = Vocab.BOS_TOKEN
if not args.disable_eos:
special_tokens_kv['eos_token'] = Vocab.EOS_TOKEN
if not args.disable_pad:
special_tokens_kv['pad_token'] = Vocab.PAD_TOKEN
# split custom special tokens
if args.model in ['yttm'] and len(args.custom_special_tokens) > 0:
raise ValueError(
'model {} do not support custom_special_tokens'.format(args.model))
for custom_special_token in args.custom_special_tokens:
kv = custom_special_token.split('=')
if not len(kv) == 2:
raise ValueError(
'parameter {} has wrong format'.format(custom_special_token))
k, v = kv[0], kv[1]
if k in special_tokens_kv:
raise ValueError(
'There are overlaps between the custom special tokens and the'
' unk, bos, eos, pad tokens')
special_tokens_kv[k] = v
# hf_wordpiece must contains mask, cls and sep tokens
# the costom defined mask,cls,sep can overwrite the default settings
if args.model == 'hf_wordpiece':
if 'mask_token' not in special_tokens_kv:
special_tokens_kv['mask_token'] = Vocab.MASK_TOKEN
if 'cls_token' not in special_tokens_kv:
special_tokens_kv['cls_token'] = Vocab.CLS_TOKEN
if 'sep_token' not in special_tokens_kv:
special_tokens_kv['sep_token'] = Vocab.SEP_TOKEN
special_tokens = list(special_tokens_kv.values())
print('special tokens: ' + ', '.join(special_tokens))
vocab = []
if args.model == 'spm':
try_import_sentencepiece()
import sentencepiece as spm
corpus_path = ','.join(corpus_path_list)
script = '--input={} --model_prefix={} --vocab_size={} --character_coverage={} --input_sentence_size={}' \
.format(corpus_path, model_prefix, args.vocab_size, args.coverage, args.input_sentence_size)
script += (' --unk_id=' + str(special_tokens.index(Vocab.UNK_TOKEN)))
script += (' --bos_id=' + ('-1' if args.disable_bos else str(
special_tokens.index(Vocab.BOS_TOKEN))))
script += (' --eos_id=' + ('-1' if args.disable_eos else str(
special_tokens.index(Vocab.EOS_TOKEN))))
script += (' --pad_id=' + ('-1' if args.disable_pad else str(
special_tokens.index(Vocab.PAD_TOKEN))))
if len(args.custom_special_tokens) > 0:
ids_in_script = script.count('_id')
script += (' --control_symbols=' +
','.join(special_tokens[ids_in_script:]))
print(script)
spm.SentencePieceTrainer.Train(script)
if 'bos_token' in special_tokens_kv:
special_tokens_kv['bos_token'] = '<s>'
if 'eos_token' in special_tokens_kv:
special_tokens_kv['eos_token'] = '</s>'
# build spm vocab
spm_model = spm.SentencePieceProcessor()
spm_model.load(model_prefix + '.model')
vocab = [spm_model.id_to_piece(i) for i in range(len(spm_model))]
os.remove(model_prefix + '.vocab')
elif args.model == 'subword_nmt':
try_import_subword_nmt()
from subword_nmt import learn_bpe
corpus_path = cat_corpus(corpus_path_list)\
if len(corpus_path_list) > 1 else corpus_path_list[0]
# build model
with open(corpus_path, 'r', encoding='utf-8') as fc,\
open(model_prefix + '.model', 'w', encoding='utf-8') as fm:
learn_bpe.learn_bpe(fc,
fm,
args.vocab_size - len(special_tokens),
total_symbols=True)
# build vocab
with open(corpus_path, 'r', encoding='utf-8') as fc, \
open(model_prefix + '.model', 'r', encoding='utf-8') as fm:
vocab.extend(special_tokens)
uniq_chars_internal = set()
uniq_chars_final = set()
uniq_words = set()
for line in fc:
for word in line.strip('\r\n ').split(' '):
if word:
uniq_words.add(word)
# this code piece is same as
# https://github.com/rsennrich/subword-nmt/blob/master/subword_nmt/learn_bpe.py shows
uniq_words = [
tuple(x[:-1]) + (x[-1] + '</w>', ) for x in uniq_words
]
for word in uniq_words:
for char in word[:-1]:
uniq_chars_internal.add(char)
uniq_chars_final.add(word[-1])
# sort to ensure the same settings produce the same vocab
vocab.extend(sorted(list(uniq_chars_internal)))
vocab.extend(sorted(list(uniq_chars_final)))
fm.readline()
pair = fm.readline()
while (pair):
vocab.append(pair.replace(' ', '', 1).strip())
pair = fm.readline()
if len(corpus_path_list) > 1:
os.remove(corpus_path)
elif args.model == 'yttm':
try_import_yttm()
import youtokentome as yttm
corpus_path = cat_corpus(corpus_path_list)\
if len(corpus_path_list) > 1 else corpus_path_list[0]
tokenizer = yttm.BPE.train(
data=corpus_path,
model=model_prefix + '.model',
vocab_size=args.vocab_size,
coverage=args.coverage,
n_threads=args.n_threads,
unk_id=special_tokens.index(Vocab.UNK_TOKEN),
bos_id=-1
if args.disable_bos else special_tokens.index(Vocab.BOS_TOKEN),
eos_id=-1
if args.disable_eos else special_tokens.index(Vocab.EOS_TOKEN),
pad_id=-1
if args.disable_pad else special_tokens.index(Vocab.PAD_TOKEN))
vocab = tokenizer.vocab()
if 'unk_token' in special_tokens_kv:
special_tokens_kv['unk_token'] = '<UNK>'
if 'bos_token' in special_tokens_kv:
special_tokens_kv['bos_token'] = '<BOS>'
if 'eos_token' in special_tokens_kv:
special_tokens_kv['eos_token'] = '<EOS>'
if 'pad_token' in special_tokens_kv:
special_tokens_kv['pad_token'] = '<PAD>'
if len(corpus_path_list) > 1:
os.remove(corpus_path)
elif args.model in ['hf_bpe', 'hf_bytebpe', 'hf_wordpiece']:
tokenizers = try_import_huggingface_tokenizers()
if args.model == 'hf_bpe':
tokenizer = tokenizers.CharBPETokenizer(lowercase=args.lowercase)
elif args.model == 'hf_bytebpe':
tokenizer = tokenizers.ByteLevelBPETokenizer(
lowercase=args.lowercase)
elif args.model == 'hf_wordpiece':
tokenizer = tokenizers.BertWordPieceTokenizer(
lowercase=args.lowercase, strip_accents=args.strip_accents)
else:
raise NotImplementedError
tokenizer.train(corpus_path_list,
vocab_size=args.vocab_size,
show_progress=True,
special_tokens=special_tokens)
tokenizer.save(args.save_dir, args.model)
# we replace the huggingface vocab file with our Vocab implementation
if args.model == 'hf_wordpiece':
hf_vocab_file = model_prefix + '-vocab.txt'
with open(hf_vocab_file, 'r', encoding='utf-8') as fv:
for line in fv:
vocab.append(line.strip())
else:
# Move the hf_${model}-merges.txt to hf_${model}.models
os.rename(
os.path.join(args.save_dir,
'{}-merges.txt'.format(args.model)),
os.path.join(args.save_dir, '{}.model'.format(args.model)))
hf_vocab_file = model_prefix + '-vocab.json'
with open(hf_vocab_file, 'r', encoding='utf-8') as fv:
vocab_kv = json.load(fv)
vocab_kv = sorted(list(vocab_kv.items()), key=lambda x: x[1])
for kv in vocab_kv:
vocab.append(kv[0])
os.remove(hf_vocab_file)
else:
raise NotImplementedError
unk_token = special_tokens_kv.pop('unk_token')
vocab_obj = Vocab(vocab, unk_token=unk_token, **special_tokens_kv)
vocab_obj.save(model_prefix + '.vocab')
def main():
options = parse_args()
torch.manual_seed(options.seed)
basename = os.path.splitext(os.path.basename(options.input))[0]
out_dir = options.out_dir or "data/{}/".format(basename)
spinner = Halo(spinner="dots", placement="right")
with open(options.input, "r", encoding="utf8") as fd:
reader = csv.reader(fd, delimiter="\t", quoting=csv.QUOTE_NONE, quotechar="")
lines = [[line[0]] for line in reader]
if not os.path.exists(out_dir):
os.makedirs(out_dir)
output_full = os.path.join(out_dir, "{}.tsv".format(basename))
with open(output_full, "w", encoding="utf8") as fd:
writer = csv.writer(fd, delimiter="\t", quoting=csv.QUOTE_NONE, quotechar="")
writer.writerows(lines)
vocab_size = 32000
spiece_out = os.path.join(out_dir, "spiece")
spiece_args = (
"--input={} "
"--model_prefix={} "
"--vocab_size={} "
"--character_coverage=1.0"
).format(output_full, spiece_out, vocab_size)
SentencePieceTrainer.Train(spiece_args)
# Load the generated vocabulary
with open("{}.vocab".format(spiece_out), "r", encoding="utf8") as fd:
reader = csv.reader(
fd, delimiter="\t", quoting=csv.QUOTE_NONE, quotechar=""
)
vocab = [line[0] for line in reader]
# Remove the special tokens <unk>, <s>, </s>
vocab = vocab[3:]
# Convert to BERT style
bert_vocab = [
v[1:] if v.startswith("▁") else "##{}".format(v) for v in vocab if v != "▁"
]
# Add BERT's special tokens to the beginning
bert_vocab = ["[PAD]", "[UNK]", "[CLS]", "[SEP]", "[MASK]"] + bert_vocab
# Fill up with unused tokens
pad_size = vocab_size - len(bert_vocab)
bert_vocab += ["unused{}".format(i) for i in range(pad_size)]
with open(os.path.join(out_dir, "vocab.txt"), "w", encoding="utf8") as fd:
writer = csv.writer(
fd, delimiter="\t", quoting=csv.QUOTE_NONE, quotechar=""
)
writer.writerows([[b] for b in bert_vocab])
# Convert to GPT-2 style
# Unfortunately it's slow and tedious.
spinner.start(text="Generating BPE vocabulary")
gpt2_vocab = ["Ġ{}".format(v[1:]) if v.startswith("▁") else v for v in vocab]
# Add the GPT-2 special token to the end
gpt2_vocab.append("<|endoftext|>")
with open(os.path.join(out_dir, "vocab.json"), "w", encoding="utf8") as fd:
json.dump({v: i for i, v in enumerate(gpt2_vocab)}, fd, ensure_ascii=False)
spiece_processor = SentencePieceProcessor()
spiece_processor.Load("{}.model".format(spiece_out))
# Encode the whole text
encoded = [
[" ".join(spiece_processor.EncodeAsPieces(line[0])).replace("▁", "Ġ")]
for line in lines
]
tmp_encoded_fd, tmp_encoded_path = tempfile.mkstemp()
tmp_bpe_fd, tmp_bpe_path = tempfile.mkstemp()
try:
# Write the encoded text to a temporary file.
with os.fdopen(tmp_encoded_fd, "w", encoding="utf8") as fd:
writer = csv.writer(
fd, delimiter="\t", quoting=csv.QUOTE_NONE, quotechar=""
)
writer.writerows(encoded)
learn_bpe(
open(tmp_encoded_path, "r", encoding="utf8"),
open(tmp_bpe_path, "w", encoding="utf8"),
num_symbols=vocab_size,
)
with open(tmp_bpe_path, "r", encoding="utf8") as fd:
reader = csv.reader(
fd, delimiter="\t", quoting=csv.QUOTE_NONE, quotechar=""
)
seen = set()
merges = []
for line in reader:
# Get rid of the </w> tokens
line = line[0].replace("</w>", "")
# Remove duplicates (due to </w> tokens)
if line not in seen:
seen.add(line)
merges.append([line])
with open(os.path.join(out_dir, "merges.txt"), "w", encoding="utf8") as fd:
writer = csv.writer(
fd, delimiter="\t", quoting=csv.QUOTE_NONE, quotechar=""
)
writer.writerows(merges)
finally:
os.remove(tmp_encoded_path)
os.remove(tmp_bpe_path)
spinner.stop()
