class CoNLL_SDP_Transform(CoNLLTransform):
def __init__(self,
config: SerializableDict = None,
map_x=True,
map_y=True,
lower=True,
n_buckets=32,
n_tokens_per_batch=5000,
min_freq=2,
**kwargs) -> None:
super().__init__(config, map_x, map_y, lower, n_buckets,
n_tokens_per_batch, min_freq, **kwargs)
self.orphan_relation = ROOT
def lock_vocabs(self):
super().lock_vocabs()
# heuristic to find the orphan relation
for rel in self.rel_vocab.idx_to_token:
if 'root' in rel.lower():
self.orphan_relation = rel
break
def file_to_inputs(self, filepath: str, gold=True):
assert gold, 'only support gold file for now'
for i, sent in enumerate(read_conll(filepath)):
prev_cells = None
parsed_sent = []
heads = []
rels = []
for j, cell in enumerate(sent):
ID = cell[0]
form = cell[1]
cpos = cell[3]
head = cell[6]
deprel = cell[7]
if prev_cells and ID != prev_cells[0]: # found end of token
parsed_sent.append(
[prev_cells[1], prev_cells[2], heads, rels])
heads = []
rels = []
heads.append(head)
rels.append(deprel)
prev_cells = [ID, form, cpos, head, deprel]
parsed_sent.append([prev_cells[1], prev_cells[2], heads, rels])
yield parsed_sent
def fit(self, trn_path: str, **kwargs) -> int:
self.form_vocab = Vocab()
self.form_vocab.add(
ROOT) # make root the 2ed elements while 0th is pad, 1st is unk
self.cpos_vocab = Vocab(pad_token=None, unk_token=None)
self.rel_vocab = Vocab(pad_token=None, unk_token=None)
num_samples = 0
counter = Counter()
for sent in self.file_to_samples(trn_path, gold=True):
num_samples += 1
for idx, (form, cpos, head, deprel) in enumerate(sent):
if idx == 0:
root = form
else:
counter[form] += 1
self.cpos_vocab.add(cpos)
self.rel_vocab.update(deprel)
for token in [
token for token, freq in counter.items()
if freq >= self.config.min_freq
]:
self.form_vocab.add(token)
return num_samples
def inputs_to_samples(self, inputs, gold=False):
for sent in inputs:
sample = []
if self.config['lower']:
for i, cell in enumerate(sent):
cell = list(sent[i])
cell[0] = cell[0].lower()
if not gold:
cell += [[0], [self.rel_vocab.safe_pad_token]]
sample.append(cell)
# insert root word with arbitrary fields, anyway it will be masked
form, cpos, head, deprel = sample[0]
sample.insert(0, [self.bos, self.bos, [0], deprel])
yield sample
def samples_to_dataset(self,
samples: Generator,
map_x=None,
map_y=None,
batch_size=5000,
shuffle=None,
repeat=None,
drop_remainder=False,
prefetch=1,
cache=True) -> tf.data.Dataset:
def generator():
# custom bucketing, load corpus into memory
corpus = list(
x for x in (samples() if callable(samples) else samples))
lengths = [1 + len(i) for i in corpus]
if len(corpus) < 32:
n_buckets = 1
else:
n_buckets = min(self.config.n_buckets, len(corpus))
buckets = dict(zip(*kmeans(lengths, n_buckets)))
sizes, buckets = zip(*[(size, bucket)
for size, bucket in buckets.items()])
# the number of chunks in each bucket, which is clipped by
# range [1, len(bucket)]
chunks = [
min(len(bucket), max(round(size * len(bucket) / batch_size),
1))
for size, bucket in zip(sizes, buckets)
]
range_fn = randperm if shuffle else arange
for i in tolist(range_fn(len(buckets))):
split_sizes = [(len(buckets[i]) - j - 1) // chunks[i] + 1
for j in range(chunks[i])]
for batch_indices in tf.split(range_fn(len(buckets[i])),
split_sizes):
indices = [buckets[i][j] for j in tolist(batch_indices)]
raw_batch = [[], [], [], []]
max_len = len(max([corpus[i] for i in indices], key=len))
for idx in indices:
arc = np.zeros((max_len, max_len), dtype=np.bool)
rel = np.zeros((max_len, max_len), dtype=np.int64)
for b in raw_batch[:2]:
b.append([])
for m, cells in enumerate(corpus[idx]):
for b, c, v in zip(
raw_batch, cells,
[self.form_vocab, self.cpos_vocab]):
b[-1].append(v.get_idx_without_add(c))
for n, r in zip(cells[2], cells[3]):
arc[m, n] = True
rid = self.rel_vocab.get_idx_without_add(r)
if rid is None:
logger.warning(
f'Relation OOV: {r} not exists in train'
)
continue
rel[m, n] = rid
raw_batch[-2].append(arc)
raw_batch[-1].append(rel)
batch = []
for b, v in zip(raw_batch,
[self.form_vocab, self.cpos_vocab]):
b = tf.keras.preprocessing.sequence.pad_sequences(
b,
padding='post',
value=v.safe_pad_token_idx,
dtype='int64')
batch.append(b)
batch += raw_batch[2:]
assert len(batch) == 4
yield (batch[0], batch[1]), (batch[2], batch[3])
# for x in generator():
# print(len(x[-1][-1]))
return super().samples_to_dataset(generator, False, False, 0, False,
repeat, drop_remainder, prefetch,
cache)
def create_types_shapes_values(self) -> Tuple[Tuple, Tuple, Tuple]:
types = (tf.int64, tf.int64), (tf.bool, tf.int64)
shapes = ([None, None], [None, None]), ([None, None,
None], [None, None, None])
values = (self.form_vocab.safe_pad_token_idx,
self.cpos_vocab.safe_pad_token_idx), (
False, self.rel_vocab.safe_pad_token_idx)
return types, shapes, values
def Y_to_outputs(self,
Y: Union[tf.Tensor, Tuple[tf.Tensor]],
gold=False,
inputs=None,
X=None) -> Iterable:
arc_preds, rel_preds, mask = Y
sents = []
for arc_sent, rel_sent, length in zip(
arc_preds, rel_preds, tf.math.count_nonzero(mask, axis=-1)):
sent = []
for arc, rel in zip(tolist(arc_sent[1:, 1:]),
tolist(rel_sent[1:, 1:])):
ar = []
for idx, (a, r) in enumerate(zip(arc, rel)):
if a:
ar.append((idx + 1, self.rel_vocab.idx_to_token[r]))
if not ar:
# orphan
ar.append((0, self.orphan_relation))
sent.append(ar)
sents.append(sent)
return sents
def XY_to_inputs_outputs(self,
X: Union[tf.Tensor, Tuple[tf.Tensor]],
Y: Union[tf.Tensor, Tuple[tf.Tensor]],
gold=False,
inputs=None) -> Iterable:
(words, feats, mask), (arc_preds, rel_preds) = X, Y
xs = inputs
ys = self.Y_to_outputs((arc_preds, rel_preds, mask))
sents = []
for x, y in zip(xs, ys):
sent = CoNLLSentence()
for idx, ((form, cpos), pred) in enumerate(zip(x, y)):
sent.append(
CoNLLWord(id=idx + 1,
form=form,
cpos=cpos,
head=[p[0] for p in pred],
deprel=[p[1] for p in pred]))
sents.append(sent)
return sents
class CoNLL_SDP_Transform(CoNLLTransform):
def __init__(self, config: SerializableDict = None, map_x=True, map_y=True, lower=True, n_buckets=32,
n_tokens_per_batch=5000, min_freq=2, **kwargs) -> None:
super().__init__(config, map_x, map_y, lower, n_buckets, n_tokens_per_batch, min_freq, **kwargs)
self.orphan_relation = ROOT
def lock_vocabs(self):
super().lock_vocabs()
# heuristic to find the orphan relation
for rel in self.rel_vocab.idx_to_token:
if 'root' in rel.lower():
self.orphan_relation = rel
break
def file_to_inputs(self, filepath: str, gold=True):
assert gold, 'only support gold file for now'
for i, sent in enumerate(read_conll(filepath)):
prev_cells = None
parsed_sent = []
heads = []
rels = []
for j, cell in enumerate(sent):
ID = cell[0]
form = cell[1]
cpos = cell[3]
head = cell[6]
deprel = cell[7]
if prev_cells and ID != prev_cells[0]: # found end of token
parsed_sent.append([prev_cells[1], prev_cells[2], heads, rels])
heads = []
rels = []
heads.append(head)
rels.append(deprel)
prev_cells = [ID, form, cpos, head, deprel]
parsed_sent.append([prev_cells[1], prev_cells[2], heads, rels])
yield parsed_sent
def fit(self, trn_path: str, **kwargs) -> int:
self.form_vocab = Vocab()
self.form_vocab.add(ROOT) # make root the 2ed elements while 0th is pad, 1st is unk
self.cpos_vocab = Vocab(pad_token=None, unk_token=None)
self.rel_vocab = Vocab(pad_token=None, unk_token=None)
num_samples = 0
counter = Counter()
for sent in self.file_to_samples(trn_path, gold=True):
num_samples += 1
for idx, (form, cpos, head, deprel) in enumerate(sent):
if idx == 0:
root = form
else:
counter[form] += 1
self.cpos_vocab.add(cpos)
self.rel_vocab.update(deprel)
for token in [token for token, freq in counter.items() if freq >= self.config.min_freq]:
self.form_vocab.add(token)
return num_samples
def inputs_to_samples(self, inputs, gold=False):
for sent in inputs:
sample = []
if self.config['lower']:
for i, cell in enumerate(sent):
cell = list(sent[i])
cell[0] = cell[0].lower()
if not gold:
cell += [[0], [self.rel_vocab.safe_pad_token]]
sample.append(cell)
# insert root word with arbitrary fields, anyway it will be masked
form, cpos, head, deprel = sample[0]
sample.insert(0, [self.bos, self.bos, [0], deprel])
yield sample
def create_types_shapes_values(self) -> Tuple[Tuple, Tuple, Tuple]:
types = (tf.int64, tf.int64), (tf.bool, tf.int64)
shapes = ([None, None], [None, None]), ([None, None, None], [None, None, None])
values = (self.form_vocab.safe_pad_token_idx, self.cpos_vocab.safe_pad_token_idx), (
False, self.rel_vocab.safe_pad_token_idx)
return types, shapes, values
def Y_to_outputs(self, Y: Union[tf.Tensor, Tuple[tf.Tensor]], gold=False, inputs=None, X=None) -> Iterable:
arc_preds, rel_preds, mask = Y
sents = []
for arc_sent, rel_sent, length in zip(arc_preds, rel_preds,
tf.math.count_nonzero(mask, axis=-1)):
sent = []
for arc, rel in zip(tolist(arc_sent[1:, 1:]), tolist(rel_sent[1:, 1:])):
ar = []
for idx, (a, r) in enumerate(zip(arc, rel)):
if a:
ar.append((idx + 1, self.rel_vocab.idx_to_token[r]))
if not ar:
# orphan
ar.append((0, self.orphan_relation))
sent.append(ar)
sents.append(sent)
return sents
def XY_to_inputs_outputs(self, X: Union[tf.Tensor, Tuple[tf.Tensor]], Y: Union[tf.Tensor, Tuple[tf.Tensor]],
gold=False, inputs=None, conll=True) -> Iterable:
(words, feats, mask), (arc_preds, rel_preds) = X, Y
xs = inputs
ys = self.Y_to_outputs((arc_preds, rel_preds, mask))
sents = []
for x, y in zip(xs, ys):
sent = CoNLLSentence()
for idx, ((form, cpos), pred) in enumerate(zip(x, y)):
head = [p[0] for p in pred]
deprel = [p[1] for p in pred]
if conll:
sent.append(CoNLLWord(id=idx + 1, form=form, cpos=cpos, head=head, deprel=deprel))
else:
sent.append([head, deprel])
sents.append(sent)
return sents
def batched_inputs_to_batches(self, corpus, indices, shuffle=False):
"""
Convert batched inputs to batches of samples
Parameters
----------
corpus : list
A list of inputs
indices : list
A list of indices, each list belongs to a batch
Returns
-------
None
Yields
-------
tuple
tuple of tf.Tensor
"""
raw_batch = [[], [], [], []]
max_len = len(max([corpus[i] for i in indices], key=len))
for idx in indices:
arc = np.zeros((max_len, max_len), dtype=np.bool)
rel = np.zeros((max_len, max_len), dtype=np.int64)
for b in raw_batch[:2]:
b.append([])
for m, cells in enumerate(corpus[idx]):
for b, c, v in zip(raw_batch, cells,
[self.form_vocab, self.cpos_vocab]):
b[-1].append(v.get_idx_without_add(c))
for n, r in zip(cells[2], cells[3]):
arc[m, n] = True
rid = self.rel_vocab.get_idx_without_add(r)
if rid is None:
logger.warning(f'Relation OOV: {r} not exists in train')
continue
rel[m, n] = rid
raw_batch[-2].append(arc)
raw_batch[-1].append(rel)
batch = []
for b, v in zip(raw_batch, [self.form_vocab, self.cpos_vocab]):
b = tf.keras.preprocessing.sequence.pad_sequences(b, padding='post',
value=v.safe_pad_token_idx,
dtype='int64')
batch.append(b)
batch += raw_batch[2:]
assert len(batch) == 4
yield (batch[0], batch[1]), (batch[2], batch[3])