class PassageParser(AbstractParser):
""" Parser for a single passage, has a state and optionally an oracle """
def __init__(self, passage, *args, **kwargs):
super().__init__(*args, **kwargs)
self.passage = self.out = passage
self.format = self.passage.extra.get("format") if self.training or self.evaluation else \
sorted(set.intersection(*map(set, filter(None, (self.model.formats, self.config.args.formats)))) or
self.model.formats)[0]
if self.training and self.config.args.verify:
errors = list(validate(self.passage))
assert not errors, errors
self.in_format = self.format or "ucca"
self.out_format = "ucca" if self.format in (None, "text") else self.format
self.lang = self.passage.attrib.get("lang", self.config.args.lang)
# Used in verify_passage to optionally ignore a mismatch in linkage nodes:
self.ignore_node = None if self.config.args.linkage else lambda n: n.tag == layer1.NodeTags.Linkage
self.state_hash_history = set()
self.state = self.oracle = self.eval_type = None
def init(self):
self.config.set_format(self.in_format)
WIKIFIER.enabled = self.config.args.wikification
self.state = State(self.passage)
# Passage is considered labeled if there are any edges or node labels in it
edges, node_labels = map(any, zip(*[(n.outgoing, n.attrib.get(LABEL_ATTRIB))
for n in self.passage.layer(layer1.LAYER_ID).all]))
self.oracle = Oracle(self.passage) if self.training or self.config.args.verify or (
(self.config.args.verbose > 1 or self.config.args.use_gold_node_labels or self.config.args.action_stats)
and (edges or node_labels)) else None
for model in self.models:
model.init_model(self.config.format, lang=self.lang if self.config.args.multilingual else None)
if ClassifierProperty.require_init_features in model.classifier_properties:
model.init_features(self.state, self.training)
def parse(self, display=True, write=False, accuracies=None):
self.init()
passage_id = self.passage.ID
try:
with concurrent.futures.ThreadPoolExecutor(max_workers=1) as executor:
executor.submit(self.parse_internal).result(self.config.args.timeout)
status = "(%d tokens/s)" % self.tokens_per_second()
except ParserException as e:
if self.training:
raise
self.config.log("%s %s: %s" % (self.config.passage_word, passage_id, e))
status = "(failed)"
except concurrent.futures.TimeoutError:
self.config.log("%s %s: timeout (%fs)" % (self.config.passage_word, passage_id, self.config.args.timeout))
status = "(timeout)"
return self.finish(status, display=display, write=write, accuracies=accuracies)
def parse_internal(self):
"""
Internal method to parse a single passage.
If training, use oracle to train on given passages. Otherwise just parse with classifier.
"""
self.config.print(" initial state: %s" % self.state)
while True:
if self.config.args.check_loops:
self.check_loop()
self.label_node() # In case root node needs labeling
true_actions = self.get_true_actions()
action, predicted_action = self.choose(true_actions)
self.state.transition(action)
need_label, label, predicted_label, true_label = self.label_node(action)
if self.config.args.action_stats:
try:
with open(self.config.args.action_stats, "a") as f:
print(",".join(map(str, [predicted_action, action] + list(true_actions.values()))), file=f)
except OSError:
pass
self.config.print(lambda: "\n".join([" predicted: %-15s true: %-15s taken: %-15s %s" % (
predicted_action, "|".join(map(str, true_actions.values())), action, self.state) if self.oracle else
" action: %-15s %s" % (action, self.state)] + (
[" predicted label: %-9s true label: %s" % (predicted_label, true_label) if self.oracle and not
self.config.args.use_gold_node_labels else " label: %s" % label] if need_label else []) + [
" " + l for l in self.state.log]))
if self.state.finished:
return # action is Finish (or early update is triggered)
def get_true_actions(self):
true_actions = {}
if self.oracle:
try:
true_actions = self.oracle.get_actions(self.state, self.model.actions, create=self.training)
except (AttributeError, AssertionError) as e:
if self.training:
raise ParserException("Error in getting action from oracle during training") from e
return true_actions
def get_true_label(self, node):
try:
return self.oracle.get_label(self.state, node) if self.oracle else (None, None)
except AssertionError as e:
if self.training:
raise ParserException("Error in getting label from oracle during training") from e
return None, None
def label_node(self, action=None):
true_label = label = predicted_label = None
need_label = self.state.need_label # Label action that requires a choice of label
if need_label:
true_label, raw_true_label = self.get_true_label(action or need_label)
label, predicted_label = self.choose(true_label, NODE_LABEL_KEY, "node label")
self.state.label_node(raw_true_label if label == true_label else label)
return need_label, label, predicted_label, true_label
def choose(self, true, axis=None, name="action"):
if axis is None:
axis = self.model.axis
elif axis == NODE_LABEL_KEY and self.config.args.use_gold_node_labels:
return true, true
labels = self.model.classifier.labels[axis]
if axis == NODE_LABEL_KEY:
true_keys = (labels[true],) if self.oracle else () # Must be before score()
is_valid = self.state.is_valid_label
else:
true_keys = None
is_valid = self.state.is_valid_action
scores, features = self.model.score(self.state, axis)
for model in self.models[1:]: # Ensemble if given more than one model; align label order and add scores
label_scores = dict(zip(model.classifier.labels[axis].all, self.model.score(self.state, axis)[0]))
scores += [label_scores.get(a, 0) for a in labels.all] # Product of Experts, assuming log(softmax)
self.config.print(lambda: " %s scores: %s" % (name, tuple(zip(labels.all, scores))), level=4)
try:
label = pred = self.predict(scores, labels.all, is_valid)
except StopIteration as e:
raise ParserException("No valid %s available\n%s" % (name, self.oracle.log if self.oracle else "")) from e
label, is_correct, true_keys, true_values = self.correct(axis, label, pred, scores, true, true_keys)
if self.training:
if not (is_correct and ClassifierProperty.update_only_on_error in self.model.classifier_properties):
assert not self.model.is_finalized, "Updating finalized model"
self.model.classifier.update(
features, axis=axis, true=true_keys, pred=labels[pred] if axis == NODE_LABEL_KEY else pred.id,
importance=[self.config.args.swap_importance if a.is_swap else 1 for a in true_values] or None)
if not is_correct and self.config.args.early_update:
self.state.finished = True
for model in self.models:
model.classifier.finished_step(self.training)
if axis != NODE_LABEL_KEY:
model.classifier.transition(label, axis=axis)
return label, pred
def correct(self, axis, label, pred, scores, true, true_keys):
true_values = is_correct = ()
if axis == NODE_LABEL_KEY:
if self.oracle:
is_correct = (label == true)
if is_correct:
self.correct_label_count += 1
elif self.training:
label = true
self.label_count += 1
else: # action
true_keys, true_values = map(list, zip(*true.items())) if true else (None, None)
label = true.get(pred.id)
is_correct = (label is not None)
if is_correct:
self.correct_action_count += 1
else:
label = true_values[scores[true_keys].argmax()] if self.training else pred
self.action_count += 1
return label, is_correct, true_keys, true_values
@staticmethod
def predict(scores, values, is_valid=None):
"""
Choose action/label based on classifier
Usually the best action/label is valid, so max is enough to choose it in O(n) time
Otherwise, sorts all the other scores to choose the best valid one in O(n lg n)
:return: valid action/label with maximum probability according to classifier
"""
return next(filter(is_valid, (values[i] for i in PassageParser.generate_descending(scores))))
@staticmethod
def generate_descending(scores):
yield scores.argmax()
yield from scores.argsort()[::-1] # Contains the max, but otherwise items might be missed (different order)
def finish(self, status, display=True, write=False, accuracies=None):
self.model.classifier.finished_item(self.training)
for model in self.models[1:]:
model.classifier.finished_item(renew=False) # So that dynet.renew_cg happens only once
if not self.training or self.config.args.verify:
self.out = self.state.create_passage(verify=self.config.args.verify, format=self.out_format)
if write:
for out_format in self.config.args.formats or [self.out_format]:
if self.config.args.normalize and out_format == "ucca":
normalize(self.out)
ioutil.write_passage(self.out, output_format=out_format, binary=out_format == "pickle",
outdir=self.config.args.outdir, prefix=self.config.args.prefix,
converter=get_output_converter(out_format), verbose=self.config.args.verbose,
append=self.config.args.join, basename=self.config.args.join)
if self.oracle and self.config.args.verify:
self.verify(self.out, self.passage)
ret = (self.out,)
if self.evaluation:
ret += (self.evaluate(self.evaluation),)
status = "%-14s %s F1=%.3f" % (status, self.eval_type, self.f1)
if display:
self.config.print("%s%.3fs %s" % (self.accuracy_str, self.duration, status), level=1)
if accuracies is not None:
accuracies[self.passage.ID] = self.correct_action_count / self.action_count if self.action_count else 0
return ret
@property
def accuracy_str(self):
if self.oracle and self.action_count:
accuracy_str = "a=%-14s" % percents_str(self.correct_action_count, self.action_count)
if self.label_count:
accuracy_str += " l=%-14s" % percents_str(self.correct_label_count, self.label_count)
return "%-33s" % accuracy_str
return ""
def evaluate(self, mode=ParseMode.test):
if self.format:
self.config.print("Converting to %s and evaluating..." % self.format)
self.eval_type = UNLABELED if self.config.is_unlabeled(self.in_format) else LABELED
evaluator = EVALUATORS.get(self.format, evaluate_ucca)
score = evaluator(self.out, self.passage, converter=get_output_converter(self.format),
verbose=self.out and self.config.args.verbose > 3,
constructions=self.config.args.constructions,
eval_types=(self.eval_type,) if mode is ParseMode.dev else (LABELED, UNLABELED))
self.f1 = average_f1(score, self.eval_type)
score.lang = self.lang
return score
def check_loop(self):
"""
Check if the current state has already occurred, indicating a loop
"""
h = hash(self.state)
assert h not in self.state_hash_history, \
"\n".join(["Transition loop", self.state.str("\n")] + [self.oracle.str("\n")] if self.oracle else ())
self.state_hash_history.add(h)
def verify(self, guessed, ref):
"""
Compare predicted passage to true passage and raise an exception if they differ
:param ref: true passage
:param guessed: predicted passage to compare
"""
assert ref.equals(guessed, ignore_node=self.ignore_node), \
"Failed to produce true passage" + (diffutil.diff_passages(ref, guessed) if self.training else "")
@property
def num_tokens(self):
return len(set(self.state.terminals).difference(self.state.buffer)) # To count even incomplete parses
@num_tokens.setter
def num_tokens(self, _):
pass
class PassageParser(AbstractParser):
""" Parser for a single passage, has a state and optionally an oracle """
def __init__(self, passage, *args, **kwargs):
super().__init__(*args, **kwargs)
self.passage = self.out = passage
self.format = self.passage.extra.get("format") if self.training or self.evaluation else \
sorted(set.intersection(*map(set, filter(None, (self.model.formats, self.config.args.formats)))) or
self.model.formats)[0]
if self.training and self.config.args.verify:
errors = list(validate(self.passage))
assert not errors, errors
self.in_format = self.format or "ucca"
self.out_format = "ucca" if self.format in (None, "text") else self.format
if self.config.args.use_bert and self.config.args.bert_multilingual is not None:
self.lang = self.passage.attrib.get("lang")
assert self.lang, "Attribute 'lang' is required per passage when using multilingual BERT"
else:
self.lang = self.passage.attrib.get("lang", self.config.args.lang)
# Used in verify_passage to optionally ignore a mismatch in linkage nodes:
self.ignore_node = None if self.config.args.linkage else lambda n: n.tag == layer1.NodeTags.Linkage
self.state_hash_history = set()
self.state = self.oracle = self.eval_type = None
def init(self):
self.config.set_format(self.in_format)
WIKIFIER.enabled = self.config.args.wikification
self.state = State(self.passage)
# Passage is considered labeled if there are any edges or node labels in it
edges, node_labels = map(any, zip(*[(n.outgoing, n.attrib.get(LABEL_ATTRIB))
for n in self.passage.layer(layer1.LAYER_ID).all]))
self.oracle = Oracle(self.passage) if self.training or self.config.args.verify or (
(self.config.args.verbose > 1 or self.config.args.use_gold_node_labels or self.config.args.action_stats)
and (edges or node_labels)) else None
for model in self.models:
model.init_model(self.config.format, lang=self.lang if self.config.args.multilingual else None)
if ClassifierProperty.require_init_features in model.classifier_properties:
model.init_features(self.state, self.training)
def parse(self, display=True, write=False, accuracies=None):
self.init()
passage_id = self.passage.ID
try:
with concurrent.futures.ThreadPoolExecutor(max_workers=1) as executor:
executor.submit(self.parse_internal).result(self.config.args.timeout)
status = "(%d tokens/s)" % self.tokens_per_second()
except ParserException as e:
if self.training:
raise
self.config.log("%s %s: %s" % (self.config.passage_word, passage_id, e))
status = "(failed)"
except concurrent.futures.TimeoutError:
self.config.log("%s %s: timeout (%fs)" % (self.config.passage_word, passage_id, self.config.args.timeout))
status = "(timeout)"
return self.finish(status, display=display, write=write, accuracies=accuracies)
def parse_internal(self):
"""
Internal method to parse a single passage.
If training, use oracle to train on given passages. Otherwise just parse with classifier.
"""
self.config.print(" initial state: %s" % self.state)
while True:
if self.config.args.check_loops:
self.check_loop()
self.label_node() # In case root node needs labeling
true_actions = self.get_true_actions()
action, predicted_action = self.choose(true_actions)
self.state.transition(action)
need_label, label, predicted_label, true_label = self.label_node(action)
if self.config.args.action_stats:
try:
with open(self.config.args.action_stats, "a") as f:
print(",".join(map(str, [predicted_action, action] + list(true_actions.values()))), file=f)
except OSError:
pass
self.config.print(lambda: "\n".join([" predicted: %-15s true: %-15s taken: %-15s %s" % (
predicted_action, "|".join(map(str, true_actions.values())), action, self.state) if self.oracle else
" action: %-15s %s" % (action, self.state)] + (
[" predicted label: %-9s true label: %s" % (predicted_label, true_label) if self.oracle and not
self.config.args.use_gold_node_labels else " label: %s" % label] if need_label else []) + [
" " + l for l in self.state.log]))
if self.state.finished:
return # action is Finish (or early update is triggered)
def get_true_actions(self):
true_actions = {}
if self.oracle:
try:
true_actions = self.oracle.get_actions(self.state, self.model.actions, create=self.training)
except (AttributeError, AssertionError) as e:
if self.training:
raise ParserException("Error in getting action from oracle during training") from e
return true_actions
def get_true_label(self, node):
try:
return self.oracle.get_label(self.state, node) if self.oracle else (None, None)
except AssertionError as e:
if self.training:
raise ParserException("Error in getting label from oracle during training") from e
return None, None
def label_node(self, action=None):
true_label = label = predicted_label = None
need_label = self.state.need_label # Label action that requires a choice of label
if need_label:
true_label, raw_true_label = self.get_true_label(action or need_label)
label, predicted_label = self.choose(true_label, NODE_LABEL_KEY, "node label")
self.state.label_node(raw_true_label if label == true_label else label)
return need_label, label, predicted_label, true_label
def choose(self, true, axis=None, name="action"):
if axis is None:
axis = self.model.axis
elif axis == NODE_LABEL_KEY and self.config.args.use_gold_node_labels:
return true, true
labels = self.model.classifier.labels[axis]
if axis == NODE_LABEL_KEY:
true_keys = (labels[true],) if self.oracle else () # Must be before score()
is_valid = self.state.is_valid_label
else:
true_keys = None
is_valid = self.state.is_valid_action
scores, features = self.model.score(self.state, axis)
for model in self.models[1:]: # Ensemble if given more than one model; align label order and add scores
label_scores = dict(zip(model.classifier.labels[axis].all, self.model.score(self.state, axis)[0]))
scores += [label_scores.get(a, 0) for a in labels.all] # Product of Experts, assuming log(softmax)
self.config.print(lambda: " %s scores: %s" % (name, tuple(zip(labels.all, scores))), level=4)
try:
label = pred = self.predict(scores, labels.all, is_valid)
except StopIteration as e:
raise ParserException("No valid %s available\n%s" % (name, self.oracle.log if self.oracle else "")) from e
label, is_correct, true_keys, true_values = self.correct(axis, label, pred, scores, true, true_keys)
if self.training:
if not (is_correct and ClassifierProperty.update_only_on_error in self.model.classifier_properties):
assert not self.model.is_finalized, "Updating finalized model"
self.model.classifier.update(
features, axis=axis, true=true_keys, pred=labels[pred] if axis == NODE_LABEL_KEY else pred.id,
importance=[self.config.args.swap_importance if a.is_swap else 1 for a in true_values] or None)
if not is_correct and self.config.args.early_update:
self.state.finished = True
for model in self.models:
model.classifier.finished_step(self.training)
if axis != NODE_LABEL_KEY:
model.classifier.transition(label, axis=axis)
return label, pred
def correct(self, axis, label, pred, scores, true, true_keys):
true_values = is_correct = ()
if axis == NODE_LABEL_KEY:
if self.oracle:
is_correct = (label == true)
if is_correct:
self.correct_label_count += 1
elif self.training:
label = true
self.label_count += 1
else: # action
true_keys, true_values = map(list, zip(*true.items())) if true else (None, None)
label = true.get(pred.id)
is_correct = (label is not None)
if is_correct:
self.correct_action_count += 1
else:
label = true_values[scores[true_keys].argmax()] if self.training else pred
self.action_count += 1
return label, is_correct, true_keys, true_values
@staticmethod
def predict(scores, values, is_valid=None):
"""
Choose action/label based on classifier
Usually the best action/label is valid, so max is enough to choose it in O(n) time
Otherwise, sorts all the other scores to choose the best valid one in O(n lg n)
:return: valid action/label with maximum probability according to classifier
"""
return next(filter(is_valid, (values[i] for i in PassageParser.generate_descending(scores))))
@staticmethod
def generate_descending(scores):
yield scores.argmax()
yield from scores.argsort()[::-1] # Contains the max, but otherwise items might be missed (different order)
def finish(self, status, display=True, write=False, accuracies=None):
self.model.classifier.finished_item(self.training)
for model in self.models[1:]:
model.classifier.finished_item(renew=False) # So that dynet.renew_cg happens only once
if not self.training or self.config.args.verify:
self.out = self.state.create_passage(verify=self.config.args.verify, format=self.out_format)
if write:
for out_format in self.config.args.formats or [self.out_format]:
if self.config.args.normalize and out_format == "ucca":
normalize(self.out)
ioutil.write_passage(self.out, output_format=out_format, binary=out_format == "pickle",
outdir=self.config.args.outdir, prefix=self.config.args.prefix,
converter=get_output_converter(out_format), verbose=self.config.args.verbose,
append=self.config.args.join, basename=self.config.args.join)
if self.oracle and self.config.args.verify:
self.verify(self.out, self.passage)
ret = (self.out,)
if self.evaluation:
ret += (self.evaluate(self.evaluation),)
status = "%-14s %s F1=%.3f" % (status, self.eval_type, self.f1)
if display:
self.config.print("%s%.3fs %s" % (self.accuracy_str, self.duration, status), level=1)
if accuracies is not None:
accuracies[self.passage.ID] = self.correct_action_count / self.action_count if self.action_count else 0
return ret
@property
def accuracy_str(self):
if self.oracle and self.action_count:
accuracy_str = "a=%-14s" % percents_str(self.correct_action_count, self.action_count)
if self.label_count:
accuracy_str += " l=%-14s" % percents_str(self.correct_label_count, self.label_count)
return "%-33s" % accuracy_str
return ""
def evaluate(self, mode=ParseMode.test):
if self.format:
self.config.print("Converting to %s and evaluating..." % self.format)
self.eval_type = UNLABELED if self.config.is_unlabeled(self.in_format) else LABELED
evaluator = EVALUATORS.get(self.format, evaluate_ucca)
score = evaluator(self.out, self.passage, converter=get_output_converter(self.format),
verbose=self.out and self.config.args.verbose > 3,
constructions=self.config.args.constructions,
eval_types=(self.eval_type,) if mode is ParseMode.dev else (LABELED, UNLABELED))
self.f1 = average_f1(score, self.eval_type)
score.lang = self.lang
return score
def check_loop(self):
"""
Check if the current state has already occurred, indicating a loop
"""
h = hash(self.state)
assert h not in self.state_hash_history, \
"\n".join(["Transition loop", self.state.str("\n")] + [self.oracle.str("\n")] if self.oracle else ())
self.state_hash_history.add(h)
def verify(self, guessed, ref):
"""
Compare predicted passage to true passage and raise an exception if they differ
:param ref: true passage
:param guessed: predicted passage to compare
"""
assert ref.equals(guessed, ignore_node=self.ignore_node), \
"Failed to produce true passage" + (diffutil.diff_passages(ref, guessed) if self.training else "")
@property
def num_tokens(self):
return len(set(self.state.terminals).difference(self.state.buffer)) # To count even incomplete parses
@num_tokens.setter
def num_tokens(self, _):
pass
class Parser(object):
"""
Main class to implement transition-based UCCA parser
"""
def __init__(self, model_file=None, model_type=None, beam=1):
self.args = Config().args
self.state = None # State object created at each parse
self.oracle = None # Oracle object created at each parse
self.action_count = self.correct_action_count = self.total_actions = self.total_correct_actions = 0
self.label_count = self.correct_label_count = self.total_labels = self.total_correct_labels = 0
self.model = Model(model_type, model_file)
self.update_only_on_error = \
ClassifierProperty.update_only_on_error in self.model.model.get_classifier_properties()
self.beam = beam # Currently unused
self.state_hash_history = None # For loop checking
# Used in verify_passage to optionally ignore a mismatch in linkage nodes:
self.ignore_node = None if self.args.linkage else lambda n: n.tag == layer1.NodeTags.Linkage
self.best_score = self.dev = self.iteration = self.eval_index = None
self.trained = False
def train(self, passages=None, dev=None, iterations=1):
"""
Train parser on given passages
:param passages: iterable of passages to train on
:param dev: iterable of passages to tune on
:param iterations: number of iterations to perform
"""
self.trained = True
if passages:
if ClassifierProperty.trainable_after_saving in self.model.model.get_classifier_properties(
):
try:
self.model.load()
except FileNotFoundError:
print("not found, starting from untrained model.")
self.best_score = 0
self.dev = dev
for self.iteration in range(1, iterations + 1):
self.eval_index = 0
print("Training iteration %d of %d: " %
(self.iteration, iterations))
Config().random.shuffle(passages)
list(self.parse(passages, mode=ParseMode.train))
yield self.eval_and_save(self.iteration == iterations,
finished_epoch=True)
print("Trained %d iterations" % iterations)
if dev or not passages:
self.model.load()
def eval_and_save(self, last=False, finished_epoch=False):
scores = None
model = self.model
self.model = self.model.finalize(finished_epoch=finished_epoch)
if self.dev:
if not self.best_score:
self.model.save()
print("Evaluating on dev passages")
passage_scores = [
s for _, s in self.parse(
self.dev, mode=ParseMode.dev, evaluate=True)
]
scores = Scores(passage_scores)
average_score = scores.average_f1()
print("Average labeled F1 score on dev: %.3f" % average_score)
print_scores(scores,
self.args.devscores,
prefix_title="iteration",
prefix=[self.iteration] +
([self.eval_index] if self.args.save_every else []))
if average_score >= self.best_score:
print("Better than previous best score (%.3f)" %
self.best_score)
if self.best_score:
self.model.save()
self.best_score = average_score
else:
print("Not better than previous best score (%.3f)" %
self.best_score)
elif last or self.args.save_every is not None:
self.model.save()
if not last:
self.model = model # Restore non-finalized model
self.model.load_labels()
return scores
def parse(self, passages, mode=ParseMode.test, evaluate=False):
"""
Parse given passages
:param passages: iterable of passages to parse
:param mode: ParseMode value.
If train, use oracle to train on given passages.
Otherwise, just parse with classifier.
:param evaluate: whether to evaluate parsed passages with respect to given ones.
Only possible when given passages are annotated.
:return: generator of parsed passages (or in train mode, the original ones),
or, if evaluate=True, of pairs of (Passage, Scores).
"""
assert mode in ParseMode, "Invalid parse mode: %s" % mode
train = (mode is ParseMode.train)
if not train and not self.trained:
list(self.train())
passage_word = "sentence" if self.args.sentences else \
"paragraph" if self.args.paragraphs else \
"passage"
self.total_actions = 0
self.total_correct_actions = 0
total_duration = 0
total_tokens = 0
passage_index = 0
if not hasattr(passages, "__iter__"): # Single passage given
passages = (passages, )
for passage_index, passage in enumerate(passages):
labeled = any(n.outgoing or n.attrib.get(LABEL_ATTRIB)
for n in passage.layer(layer1.LAYER_ID).all)
assert not train or labeled, "Cannot train on unannotated passage: %s" % passage.ID
assert not evaluate or labeled, "Cannot evaluate on unannotated passage: %s" % passage.ID
print("%s %-7s" % (passage_word, passage.ID),
end=Config().line_end,
flush=True)
started = time.time()
self.action_count = self.correct_action_count = self.label_count = self.correct_label_count = 0
textutil.annotate(passage, verbose=self.args.verbose >
1) # tag POS and parse dependencies
self.state = State(passage)
self.state_hash_history = set()
self.oracle = Oracle(passage) if train or (
self.args.verbose or Config().args.use_gold_node_labels
) and labeled or self.args.verify else None
failed = False
if ClassifierProperty.require_init_features in self.model.model.get_classifier_properties(
):
self.model.init_features(self.state, train)
try:
self.parse_passage(
train) # This is where the actual parsing takes place
except ParserException as e:
if train:
raise
Config().log("%s %s: %s" % (passage_word, passage.ID, e))
failed = True
guessed = self.state.create_passage(
verify=self.args.verify
) if not train or self.args.verify else passage
duration = time.time() - started
total_duration += duration
num_tokens = len(
set(self.state.terminals).difference(self.state.buffer))
total_tokens += num_tokens
if self.oracle: # We have an oracle to verify by
if not failed and self.args.verify:
self.verify_passage(guessed, passage, train)
if self.action_count:
accuracy_str = "%d%% (%d/%d)" % (
100 * self.correct_action_count / self.action_count,
self.correct_action_count, self.action_count)
if self.label_count:
accuracy_str += " %d%% (%d/%d)" % (
100 * self.correct_label_count / self.label_count,
self.correct_label_count, self.label_count)
print("%-30s" % accuracy_str, end=Config().line_end)
print("%0.3fs" % duration, end="")
print("%-15s" % (" (failed)" if failed else " (%d tokens/s)" %
(num_tokens / duration)),
end="")
print(Config().line_end, end="")
if self.oracle:
print(Config().line_end, flush=True)
self.model.model.finished_item(train)
self.total_correct_actions += self.correct_action_count
self.total_actions += self.action_count
self.total_correct_labels += self.correct_label_count
self.total_labels += self.label_count
if train and self.args.save_every and (
passage_index + 1) % self.args.save_every == 0:
self.eval_and_save()
self.eval_index += 1
yield (guessed, self.evaluate_passage(
guessed, passage)) if evaluate else guessed
if passages:
print("Parsed %d %ss" % (passage_index + 1, passage_word))
if self.oracle and self.total_actions:
accuracy_str = "%d%% correct actions (%d/%d)" % (
100 * self.total_correct_actions / self.total_actions,
self.total_correct_actions, self.total_actions)
if self.total_labels:
accuracy_str += ", %d%% correct labels (%d/%d)" % (
100 * self.total_correct_labels / self.total_labels,
self.total_correct_labels, self.total_labels)
print("Overall %s on %s" % (accuracy_str, mode.name))
if total_duration:
print(
"Total time: %.3fs (average time/%s: %.3fs, average tokens/s: %d)"
% (total_duration, passage_word, total_duration /
(passage_index + 1), total_tokens / total_duration),
flush=True)
def parse_passage(self, train):
"""
Internal method to parse a single passage
:param train: use oracle to train on given passages, or just parse with classifier?
"""
if self.args.verbose > 1:
print(" initial state: %s" % self.state)
while True:
if self.args.check_loops:
self.check_loop()
features = self.model.feature_extractor.extract_features(
self.state)
true_actions = self.get_true_actions(train)
action, predicted_action = self.choose_action(
features, train, true_actions)
try:
self.state.transition(action)
except AssertionError as e:
raise ParserException("Invalid transition: %s %s" %
(action, self.state)) from e
if self.args.verbose > 1:
if self.oracle:
print(" predicted: %-15s true: %-15s taken: %-15s %s" %
(predicted_action, "|".join(
map(str,
true_actions.values())), action, self.state))
else:
print(" action: %-15s %s" % (action, self.state))
if self.state.need_label: # Label action that requires a choice of label
true_label = self.get_true_label(action.orig_node)
label, predicted_label = self.choose_label(
features, train, true_label)
self.state.label_node(label)
if self.args.verbose > 1:
if self.oracle and not Config().args.use_gold_node_labels:
print(" predicted label: %-15s true label: %-15s" %
(predicted_label, true_label))
else:
print(" label: %-15s" % label)
self.model.model.finished_step(train)
if self.args.verbose > 1:
for line in self.state.log:
print(" " + line)
if self.state.finished:
return # action is Finish (or early update is triggered)
def get_true_actions(self, train):
true_actions = {}
if self.oracle:
try:
true_actions = self.oracle.get_actions(self.state,
self.model.actions,
create=train)
except (AttributeError, AssertionError) as e:
if train:
raise ParserException(
"Error in oracle during training") from e
return true_actions
def choose_action(self, features, train, true_actions):
scores = self.model.model.score(
features, axis=ACTION_AXIS) # Returns NumPy array
if self.args.verbose > 2:
print(" action scores: " +
",".join(("%s: %g" % x
for x in zip(self.model.actions.all, scores))))
try:
predicted_action = self.predict(scores, self.model.actions.all,
self.state.is_valid_action)
except StopIteration as e:
raise ParserException(
"No valid action available\n%s" %
(self.oracle.log if self.oracle else "")) from e
action = true_actions.get(predicted_action.id)
is_correct = (action is not None)
if is_correct:
self.correct_action_count += 1
else:
action = Config().random.choice(list(
true_actions.values())) if train else predicted_action
if train and not (is_correct and self.update_only_on_error):
best_action = self.predict(scores[list(true_actions.keys())],
list(true_actions.values()))
self.model.model.update(features,
axis=ACTION_AXIS,
pred=predicted_action.id,
true=best_action.id,
importance=self.args.swap_importance
if best_action.is_swap else 1)
if train and not is_correct and self.args.early_update:
self.state.finished = True
self.action_count += 1
return action, predicted_action
def get_true_label(self, node):
true_label = None
if self.oracle:
if node is not None:
true_label = node.attrib.get(LABEL_ATTRIB)
if true_label is not None:
true_label, _, _ = true_label.partition(LABEL_SEPARATOR)
if not self.state.is_valid_label(true_label):
raise ParserException("True label is invalid: %s %s" %
(true_label, self.state))
return true_label
def choose_label(self, features, train, true_label):
true_id = self.model.labels[
true_label] if self.oracle else None # Needs to happen before score()
if Config().args.use_gold_node_labels:
return true_label, true_label
scores = self.model.model.score(features, axis=LABEL_AXIS)
if self.args.verbose > 2:
print(" label scores: " +
",".join(("%s: %g" % x
for x in zip(self.model.labels.all, scores))))
label = predicted_label = self.predict(scores, self.model.labels.all,
self.state.is_valid_label)
if self.oracle:
is_correct = (label == true_label)
if is_correct:
self.correct_label_count += 1
if train and not (is_correct and self.update_only_on_error):
self.model.model.update(features,
axis=LABEL_AXIS,
pred=self.model.labels[label],
true=true_id)
label = true_label
self.label_count += 1
return label, predicted_label
def predict(self, scores, values, is_valid=None):
"""
Choose action/label based on classifier
Usually the best action/label is valid, so max is enough to choose it in O(n) time
Otherwise, sorts all the other scores to choose the best valid one in O(n lg n)
:return: valid action/label with maximum probability according to classifier
"""
return next(
filter(is_valid,
(values[i] for i in self.generate_descending(scores))))
@staticmethod
def generate_descending(scores):
yield scores.argmax()
yield from scores.argsort(
)[::
-1] # Contains the max, but otherwise items might be missed (different order)
def check_loop(self):
"""
Check if the current state has already occurred, indicating a loop
"""
h = hash(self.state)
assert h not in self.state_hash_history,\
"\n".join(["Transition loop", self.state.str("\n")] + [self.oracle.str("\n")] if self.oracle else ())
self.state_hash_history.add(h)
def evaluate_passage(self, guessed, ref):
converters = CONVERTERS.get(ref.extra.get(
"format")) # returns (input converter, output converter) tuple
score = EVALUATORS.get(ref.extra.get("format"), evaluation).evaluate(
guessed,
ref,
converter=converters
and converters[1], # converter output is list of lines
verbose=guessed and self.args.verbose > 2,
constructions=self.args.constructions)
print("F1=%.3f" % score.average_f1(), flush=True)
return score
def verify_passage(self, guessed, ref, show_diff):
"""
Compare predicted passage to true passage and raise an exception if they differ
:param ref: true passage
:param guessed: predicted passage to compare
:param show_diff: if passages differ, show the difference between them?
Depends on guessed having the original node IDs annotated in the "remarks" field for each node
"""
assert ref.equals(guessed, ignore_node=self.ignore_node), \
"Failed to produce true passage" + (diffutil.diff_passages(ref, guessed) if show_diff else "")
