def generate_labels(self, verbose=0):
"""return extents and label dictionary for generating proposed XML docs"""
# load data
train_data, test_data = self.generate_test_train()
labels = [self.label_function(y) for y in train_data]
# reporting
if verbose >= 1:
print "data loaded"
if verbose >= 2:
fd = {}
for l in labels:
fd[l] = fd.get(l, 1) + 1
print fd
# train model
clf = SKClassifier(LogisticRegression(),
self.label_function,
self.feature_functions)
clf.add_labels(set(labels))
clf.train(train_data)
# reporting
if verbose >= 1:
print "model trained"
# classify
pred = clf.classify(test_data,
keys = ["{a},{b},{c}".format(a=extent.basename,
b=extent.lex[0].begin,
c=extent.lex[-1].end)
for extent in test_data]
)
return pred, test_data
def run_demo(self, verbose=0):
""" test functionality of loading data, classification and evaluation """
# load training data
train_corpus = Corpus(self.train_path)
extents = list(train_corpus.extents(self.indices_function,
self.extent_class))
# load test data
if self.test_path:
train_data = extents
test_corpus = HypotheticalCorpus(self.test_path)
test_data = list(test_corpus.extents(self.indices_function,
self.extent_class))
else:
i = int(len(extents) * self.split)
train_data = extents[:i]
test_data = extents[i:]
# verbosity functionality
if verbose >= 1:
print "data loaded"
labels = [self.label_function(x) for x in extents]
if verbose >= 2:
fd = {}
for l in labels:
fd[l] = fd.get(l, 1) + 1
print fd
# train model
clf = SKClassifier(LogisticRegression(),
self.label_function,
self.feature_functions)
clf.add_labels(set(labels))
clf.train(train_data)
if verbose >= 1:
print "model trained"
# classify
pred = clf.classify(test_data,
keys = ["{a},{b},{c}".format(a=extent.basename,
b=extent.lex[0].begin,
c=extent.lex[-1].end)
for extent in test_data])
# evaluate
if self.gold_path:
gold_corpus = Corpus(self.gold_path)
gold_data = list(gold_corpus.extents(self.indices_function,
self.extent_class))
else:
gold_data = test_data
gold_labels = dict([
("{a},{b},{c}".format(a=extent.basename,
b=extent.lex[0].begin,
c=extent.lex[-1].end),
self.label_function(extent))
for extent in gold_data])
clf.evaluate(pred, gold_labels)
