# 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 itertools
import json
import logging
import os
from argparse import Namespace
import numpy as np
from fairseq import metrics, options, utils
from fairseq.data import (
AppendTokenDataset,
ConcatDataset,
LanguagePairDataset,
PrependTokenDataset,
StripTokenDataset,
TruncateDataset,
data_utils,
encoders,
indexed_dataset,
)
from fairseq.tasks import LegacyFairseqTask, register_task
EVAL_BLEU_ORDER = 4
logger = logging.getLogger(__name__)
def load_langpair_dataset(
data_path,
split,
src,
src_dict,
tgt,
tgt_dict,
combine,
dataset_impl,
upsample_primary,
left_pad_source,
left_pad_target,
max_source_positions,
max_target_positions,
prepend_bos=False,
load_alignments=False,
truncate_source=False,
append_source_id=False,
num_buckets=0,
shuffle=True,
pad_to_multiple=1,
):
def split_exists(split, src, tgt, lang, data_path):
filename = os.path.join(data_path, "{}.{}-{}.{}".format(split, src, tgt, lang))
return indexed_dataset.dataset_exists(filename, impl=dataset_impl)
src_datasets = []
tgt_datasets = []
for k in itertools.count():
split_k = split + (str(k) if k > 0 else "")
# infer langcode
if split_exists(split_k, src, tgt, src, data_path):
prefix = os.path.join(data_path, "{}.{}-{}.".format(split_k, src, tgt))
elif split_exists(split_k, tgt, src, src, data_path):
prefix = os.path.join(data_path, "{}.{}-{}.".format(split_k, tgt, src))
else:
if k > 0:
break
else:
raise FileNotFoundError(
"Dataset not found: {} ({})".format(split, data_path)
)
src_dataset = data_utils.load_indexed_dataset(
prefix + src, src_dict, dataset_impl
)
if truncate_source:
src_dataset = AppendTokenDataset(
TruncateDataset(
StripTokenDataset(src_dataset, src_dict.eos()),
max_source_positions - 1,
),
src_dict.eos(),
)
src_datasets.append(src_dataset)
tgt_dataset = data_utils.load_indexed_dataset(
prefix + tgt, tgt_dict, dataset_impl
)
if tgt_dataset is not None:
tgt_datasets.append(tgt_dataset)
logger.info(
"{} {} {}-{} {} examples".format(
data_path, split_k, src, tgt, len(src_datasets[-1])
)
)
if not combine:
break
assert len(src_datasets) == len(tgt_datasets) or len(tgt_datasets) == 0
if len(src_datasets) == 1:
src_dataset = src_datasets[0]
tgt_dataset = tgt_datasets[0] if len(tgt_datasets) > 0 else None
else:
sample_ratios = [1] * len(src_datasets)
sample_ratios[0] = upsample_primary
src_dataset = ConcatDataset(src_datasets, sample_ratios)
if len(tgt_datasets) > 0:
tgt_dataset = ConcatDataset(tgt_datasets, sample_ratios)
else:
tgt_dataset = None
if prepend_bos:
assert hasattr(src_dict, "bos_index") and hasattr(tgt_dict, "bos_index")
src_dataset = PrependTokenDataset(src_dataset, src_dict.bos())
if tgt_dataset is not None:
tgt_dataset = PrependTokenDataset(tgt_dataset, tgt_dict.bos())
eos = None
if append_source_id:
src_dataset = AppendTokenDataset(
src_dataset, src_dict.index("[{}]".format(src))
)
if tgt_dataset is not None:
tgt_dataset = AppendTokenDataset(
tgt_dataset, tgt_dict.index("[{}]".format(tgt))
)
eos = tgt_dict.index("[{}]".format(tgt))
align_dataset = None
if load_alignments:
align_path = os.path.join(data_path, "{}.align.{}-{}".format(split, src, tgt))
if indexed_dataset.dataset_exists(align_path, impl=dataset_impl):
align_dataset = data_utils.load_indexed_dataset(
align_path, None, dataset_impl
)
tgt_dataset_sizes = tgt_dataset.sizes if tgt_dataset is not None else None
return LanguagePairDataset(
src_dataset,
src_dataset.sizes,
src_dict,
tgt_dataset,
tgt_dataset_sizes,
tgt_dict,
left_pad_source=left_pad_source,
left_pad_target=left_pad_target,
align_dataset=align_dataset,
eos=eos,
num_buckets=num_buckets,
shuffle=shuffle,
pad_to_multiple=pad_to_multiple,
)
[docs]@register_task("translation")
class TranslationTask(LegacyFairseqTask):
"""
Translate from one (source) language to another (target) language.
Args:
src_dict (~fairseq.data.Dictionary): dictionary for the source language
tgt_dict (~fairseq.data.Dictionary): dictionary for the target language
.. note::
The translation task is compatible with :mod:`fairseq-train`,
:mod:`fairseq-generate` and :mod:`fairseq-interactive`.
The translation task provides the following additional command-line
arguments:
.. argparse::
:ref: fairseq.tasks.translation_parser
:prog:
"""
@staticmethod
def add_args(parser):
"""Add task-specific arguments to the parser."""
# fmt: off
parser.add_argument('data', help='colon separated path to data directories list, \
will be iterated upon during epochs in round-robin manner; \
however, valid and test data are always in the first directory to \
avoid the need for repeating them in all directories')
parser.add_argument('-s', '--source-lang', default=None, metavar='SRC',
help='source language')
parser.add_argument('-t', '--target-lang', default=None, metavar='TARGET',
help='target language')
parser.add_argument('--load-alignments', action='store_true',
help='load the binarized alignments')
parser.add_argument('--left-pad-source', default='True', type=str, metavar='BOOL',
help='pad the source on the left')
parser.add_argument('--left-pad-target', default='False', type=str, metavar='BOOL',
help='pad the target on the left')
parser.add_argument('--max-source-positions', default=1024, type=int, metavar='N',
help='max number of tokens in the source sequence')
parser.add_argument('--max-target-positions', default=1024, type=int, metavar='N',
help='max number of tokens in the target sequence')
parser.add_argument('--upsample-primary', default=1, type=int,
help='amount to upsample primary dataset')
parser.add_argument('--truncate-source', action='store_true', default=False,
help='truncate source to max-source-positions')
parser.add_argument('--num-batch-buckets', default=0, type=int, metavar='N',
help='if >0, then bucket source and target lengths into N '
'buckets and pad accordingly; this is useful on TPUs '
'to minimize the number of compilations')
# options for reporting BLEU during validation
parser.add_argument('--eval-bleu', action='store_true',
help='evaluation with BLEU scores')
parser.add_argument('--eval-bleu-detok', type=str, default="space",
help='detokenize before computing BLEU (e.g., "moses"); '
'required if using --eval-bleu; use "space" to '
'disable detokenization; see fairseq.data.encoders '
'for other options')
parser.add_argument('--eval-bleu-detok-args', type=str, metavar='JSON',
help='args for building the tokenizer, if needed')
parser.add_argument('--eval-tokenized-bleu', action='store_true', default=False,
help='compute tokenized BLEU instead of sacrebleu')
parser.add_argument('--eval-bleu-remove-bpe', nargs='?', const='@@ ', default=None,
help='remove BPE before computing BLEU')
parser.add_argument('--eval-bleu-args', type=str, metavar='JSON',
help='generation args for BLUE scoring, '
'e.g., \'{"beam": 4, "lenpen": 0.6}\'')
parser.add_argument('--eval-bleu-print-samples', action='store_true',
help='print sample generations during validation')
# fmt: on
def __init__(self, args, src_dict, tgt_dict):
super().__init__(args)
self.src_dict = src_dict
self.tgt_dict = tgt_dict
@classmethod
def setup_task(cls, args, **kwargs):
"""Setup the task (e.g., load dictionaries).
Args:
args (argparse.Namespace): parsed command-line arguments
"""
args.left_pad_source = utils.eval_bool(args.left_pad_source)
args.left_pad_target = utils.eval_bool(args.left_pad_target)
paths = utils.split_paths(args.data)
assert len(paths) > 0
# find language pair automatically
if args.source_lang is None or args.target_lang is None:
args.source_lang, args.target_lang = data_utils.infer_language_pair(
paths[0]
)
if args.source_lang is None or args.target_lang is None:
raise Exception(
"Could not infer language pair, please provide it explicitly"
)
# load dictionaries
src_dict = cls.load_dictionary(
os.path.join(paths[0], "dict.{}.txt".format(args.source_lang))
)
tgt_dict = cls.load_dictionary(
os.path.join(paths[0], "dict.{}.txt".format(args.target_lang))
)
assert src_dict.pad() == tgt_dict.pad()
assert src_dict.eos() == tgt_dict.eos()
assert src_dict.unk() == tgt_dict.unk()
logger.info("[{}] dictionary: {} types".format(args.source_lang, len(src_dict)))
logger.info("[{}] dictionary: {} types".format(args.target_lang, len(tgt_dict)))
return cls(args, src_dict, tgt_dict)
def load_dataset(self, split, epoch=1, combine=False, **kwargs):
"""Load a given dataset split.
Args:
split (str): name of the split (e.g., train, valid, test)
"""
paths = utils.split_paths(self.args.data)
assert len(paths) > 0
if split != getattr(self.args, "train_subset", None):
# if not training data set, use the first shard for valid and test
paths = paths[:1]
data_path = paths[(epoch - 1) % len(paths)]
# infer langcode
src, tgt = self.args.source_lang, self.args.target_lang
self.datasets[split] = load_langpair_dataset(
data_path,
split,
src,
self.src_dict,
tgt,
self.tgt_dict,
combine=combine,
dataset_impl=self.args.dataset_impl,
upsample_primary=self.args.upsample_primary,
left_pad_source=self.args.left_pad_source,
left_pad_target=self.args.left_pad_target,
max_source_positions=self.args.max_source_positions,
max_target_positions=self.args.max_target_positions,
load_alignments=self.args.load_alignments,
truncate_source=self.args.truncate_source,
num_buckets=self.args.num_batch_buckets,
shuffle=(split != "test"),
pad_to_multiple=self.args.required_seq_len_multiple,
)
def build_dataset_for_inference(self, src_tokens, src_lengths, constraints=None):
return LanguagePairDataset(
src_tokens,
src_lengths,
self.source_dictionary,
tgt_dict=self.target_dictionary,
constraints=constraints,
)
def build_model(self, args):
model = super().build_model(args)
if getattr(args, "eval_bleu", False):
assert getattr(args, "eval_bleu_detok", None) is not None, (
"--eval-bleu-detok is required if using --eval-bleu; "
"try --eval-bleu-detok=moses (or --eval-bleu-detok=space "
"to disable detokenization, e.g., when using sentencepiece)"
)
detok_args = json.loads(getattr(args, "eval_bleu_detok_args", "{}") or "{}")
self.tokenizer = encoders.build_tokenizer(
Namespace(
tokenizer=getattr(args, "eval_bleu_detok", None), **detok_args
)
)
gen_args = json.loads(getattr(args, "eval_bleu_args", "{}") or "{}")
self.sequence_generator = self.build_generator(
[model], Namespace(**gen_args)
)
return model
def valid_step(self, sample, model, criterion):
loss, sample_size, logging_output = super().valid_step(sample, model, criterion)
if self.args.eval_bleu:
bleu = self._inference_with_bleu(self.sequence_generator, sample, model)
logging_output["_bleu_sys_len"] = bleu.sys_len
logging_output["_bleu_ref_len"] = bleu.ref_len
# we split counts into separate entries so that they can be
# summed efficiently across workers using fast-stat-sync
assert len(bleu.counts) == EVAL_BLEU_ORDER
for i in range(EVAL_BLEU_ORDER):
logging_output["_bleu_counts_" + str(i)] = bleu.counts[i]
logging_output["_bleu_totals_" + str(i)] = bleu.totals[i]
return loss, sample_size, logging_output
def reduce_metrics(self, logging_outputs, criterion):
super().reduce_metrics(logging_outputs, criterion)
if self.args.eval_bleu:
def sum_logs(key):
return sum(log.get(key, 0) for log in logging_outputs)
counts, totals = [], []
for i in range(EVAL_BLEU_ORDER):
counts.append(sum_logs("_bleu_counts_" + str(i)))
totals.append(sum_logs("_bleu_totals_" + str(i)))
if max(totals) > 0:
# log counts as numpy arrays -- log_scalar will sum them correctly
metrics.log_scalar("_bleu_counts", np.array(counts))
metrics.log_scalar("_bleu_totals", np.array(totals))
metrics.log_scalar("_bleu_sys_len", sum_logs("_bleu_sys_len"))
metrics.log_scalar("_bleu_ref_len", sum_logs("_bleu_ref_len"))
def compute_bleu(meters):
import inspect
import sacrebleu
fn_sig = inspect.getfullargspec(sacrebleu.compute_bleu)[0]
if "smooth_method" in fn_sig:
smooth = {"smooth_method": "exp"}
else:
smooth = {"smooth": "exp"}
bleu = sacrebleu.compute_bleu(
correct=meters["_bleu_counts"].sum,
total=meters["_bleu_totals"].sum,
sys_len=meters["_bleu_sys_len"].sum,
ref_len=meters["_bleu_ref_len"].sum,
**smooth
)
return round(bleu.score, 2)
metrics.log_derived("bleu", compute_bleu)
def max_positions(self):
"""Return the max sentence length allowed by the task."""
return (self.args.max_source_positions, self.args.max_target_positions)
@property
def source_dictionary(self):
"""Return the source :class:`~fairseq.data.Dictionary`."""
return self.src_dict
@property
def target_dictionary(self):
"""Return the target :class:`~fairseq.data.Dictionary`."""
return self.tgt_dict
def _inference_with_bleu(self, generator, sample, model):
import sacrebleu
def decode(toks, escape_unk=False):
s = self.tgt_dict.string(
toks.int().cpu(),
self.args.eval_bleu_remove_bpe,
# The default unknown string in fairseq is `<unk>`, but
# this is tokenized by sacrebleu as `< unk >`, inflating
# BLEU scores. Instead, we use a somewhat more verbose
# alternative that is unlikely to appear in the real
# reference, but doesn't get split into multiple tokens.
unk_string=("UNKNOWNTOKENINREF" if escape_unk else "UNKNOWNTOKENINHYP"),
)
if self.tokenizer:
s = self.tokenizer.decode(s)
return s
gen_out = self.inference_step(generator, [model], sample, prefix_tokens=None)
hyps, refs = [], []
for i in range(len(gen_out)):
hyps.append(decode(gen_out[i][0]["tokens"]))
refs.append(
decode(
utils.strip_pad(sample["target"][i], self.tgt_dict.pad()),
escape_unk=True, # don't count <unk> as matches to the hypo
)
)
if self.args.eval_bleu_print_samples:
logger.info("example hypothesis: " + hyps[0])
logger.info("example reference: " + refs[0])
if self.args.eval_tokenized_bleu:
return sacrebleu.corpus_bleu(hyps, [refs], tokenize="none")
else:
return sacrebleu.corpus_bleu(hyps, [refs])