forked from moreo/QuaPy
Bug fixes on use of classes_. Tests.
This commit is contained in:
parent
bfbfe08116
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5b772c7eda
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@ -2,40 +2,52 @@ import numpy as np
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from scipy.sparse import issparse
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from scipy.sparse import vstack
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from sklearn.model_selection import train_test_split, RepeatedStratifiedKFold
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from quapy.functional import artificial_prevalence_sampling, strprev
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class LabelledCollection:
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'''
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A LabelledCollection is a set of objects each with a label associated to it.
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'''
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def __init__(self, instances, labels, n_classes=None):
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def __init__(self, instances, labels, classes_=None):
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"""
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:param instances: list of objects
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:param labels: list of labels, same length of instances
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:param classes_: optional, list of classes from which labels are taken. When used, must contain the set of values used in labels.
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"""
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if issparse(instances):
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self.instances = instances
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elif isinstance(instances, list) and len(instances)>0 and isinstance(instances[0], str):
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elif isinstance(instances, list) and len(instances) > 0 and isinstance(instances[0], str):
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# lists of strings occupy too much as ndarrays (although python-objects add a heavy overload)
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self.instances = np.asarray(instances, dtype=object)
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else:
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self.instances = np.asarray(instances)
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self.labels = np.asarray(labels, dtype=int)
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self.labels = np.asarray(labels)
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n_docs = len(self)
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if n_classes is None:
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if classes_ is None:
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self.classes_ = np.unique(self.labels)
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self.classes_.sort()
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else:
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self.classes_ = np.arange(n_classes)
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self.index = {class_i: np.arange(n_docs)[self.labels == class_i] for class_i in self.classes_}
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self.classes_ = np.unique(np.asarray(classes_))
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self.classes_.sort()
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if len(set(self.labels).difference(set(classes_))) > 0:
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raise ValueError('labels contains values not included in classes_')
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self.index = {class_: np.arange(n_docs)[self.labels == class_] for class_ in self.classes_}
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@classmethod
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def load(cls, path:str, loader_func:callable):
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def load(cls, path: str, loader_func: callable):
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return LabelledCollection(*loader_func(path))
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def __len__(self):
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return self.instances.shape[0]
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def prevalence(self):
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return self.counts()/len(self)
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return self.counts() / len(self)
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def counts(self):
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return np.asarray([len(self.index[ci]) for ci in self.classes_])
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return np.asarray([len(self.index[class_]) for class_ in self.classes_])
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@property
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def n_classes(self):
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@ -48,21 +60,21 @@ class LabelledCollection:
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def sampling_index(self, size, *prevs, shuffle=True):
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if len(prevs) == 0: # no prevalence was indicated; returns an index for uniform sampling
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return np.random.choice(len(self), size, replace=False)
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if len(prevs) == self.n_classes-1:
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prevs = prevs + (1-sum(prevs),)
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if len(prevs) == self.n_classes - 1:
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prevs = prevs + (1 - sum(prevs),)
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assert len(prevs) == self.n_classes, 'unexpected number of prevalences'
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assert sum(prevs) == 1, f'prevalences ({prevs}) wrong range (sum={sum(prevs)})'
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taken = 0
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indexes_sample = []
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for i, class_i in enumerate(self.classes_):
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if i == self.n_classes-1:
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for i, class_ in enumerate(self.classes_):
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if i == self.n_classes - 1:
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n_requested = size - taken
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else:
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n_requested = int(size * prevs[i])
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n_candidates = len(self.index[class_i])
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index_sample = self.index[class_i][
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n_candidates = len(self.index[class_])
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index_sample = self.index[class_][
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np.random.choice(n_candidates, size=n_requested, replace=(n_requested > n_candidates))
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] if n_requested > 0 else []
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@ -90,21 +102,22 @@ class LabelledCollection:
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def sampling_from_index(self, index):
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documents = self.instances[index]
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labels = self.labels[index]
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return LabelledCollection(documents, labels, n_classes=self.n_classes)
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return LabelledCollection(documents, labels, classes_=self.classes_)
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def split_stratified(self, train_prop=0.6, random_state=None):
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# with temp_seed(42):
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tr_docs, te_docs, tr_labels, te_labels = \
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train_test_split(self.instances, self.labels, train_size=train_prop, stratify=self.labels, random_state=random_state)
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train_test_split(self.instances, self.labels, train_size=train_prop, stratify=self.labels,
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random_state=random_state)
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return LabelledCollection(tr_docs, tr_labels), LabelledCollection(te_docs, te_labels)
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def artificial_sampling_generator(self, sample_size, n_prevalences=101, repeats=1):
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dimensions=self.n_classes
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dimensions = self.n_classes
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for prevs in artificial_prevalence_sampling(dimensions, n_prevalences, repeats):
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yield self.sampling(sample_size, *prevs)
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def artificial_sampling_index_generator(self, sample_size, n_prevalences=101, repeats=1):
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dimensions=self.n_classes
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dimensions = self.n_classes
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for prevs in artificial_prevalence_sampling(dimensions, n_prevalences, repeats):
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yield self.sampling_index(sample_size, *prevs)
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@ -144,7 +157,7 @@ class LabelledCollection:
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stats_ = {'instances': ninstances,
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'type': instance_type,
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'features': nfeats,
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'classes': self.n_classes,
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'classes': self.classes_,
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'prevs': strprev(self.prevalence())}
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if show:
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print(f'#instances={stats_["instances"]}, type={stats_["type"]}, #features={stats_["features"]}, '
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@ -158,10 +171,11 @@ class LabelledCollection:
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test = self.sampling_from_index(test_index)
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yield train, test
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class Dataset:
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def __init__(self, training: LabelledCollection, test: LabelledCollection, vocabulary: dict = None, name=''):
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assert training.n_classes == test.n_classes, 'incompatible labels in training and test collections'
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assert set(training.classes_) == set(test.classes_), 'incompatible labels in training and test collections'
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self.training = training
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self.test = test
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self.vocabulary = vocabulary
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@ -172,8 +186,8 @@ class Dataset:
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return Dataset(*collection.split_stratified(train_prop=train_size))
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@property
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def n_classes(self):
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return self.training.n_classes
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def classes_(self):
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return self.training.classes_
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@property
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def binary(self):
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@ -195,19 +209,15 @@ class Dataset:
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print(f'Dataset={self.name} #tr-instances={tr_stats["instances"]}, #te-instances={te_stats["instances"]}, '
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f'type={tr_stats["type"]}, #features={tr_stats["features"]}, #classes={tr_stats["classes"]}, '
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f'tr-prevs={tr_stats["prevs"]}, te-prevs={te_stats["prevs"]}')
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return {'train': tr_stats ,'test':te_stats}
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return {'train': tr_stats, 'test': te_stats}
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@classmethod
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def kFCV(cls, data: LabelledCollection, nfolds=5, nrepeats=1, random_state=0):
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for i, (train, test) in enumerate(data.kFCV(nfolds=nfolds, nrepeats=nrepeats, random_state=random_state)):
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yield Dataset(train, test, name=f'fold {(i%nfolds)+1}/{nfolds} (round={(i//nfolds)+1})')
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yield Dataset(train, test, name=f'fold {(i % nfolds) + 1}/{nfolds} (round={(i // nfolds) + 1})')
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def isbinary(data):
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if isinstance(data, Dataset) or isinstance(data, LabelledCollection):
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return data.binary
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return False
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@ -47,7 +47,7 @@ UCI_DATASETS = ['acute.a', 'acute.b',
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'yeast']
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def fetch_reviews(dataset_name, tfidf=False, min_df=None, data_home=None, pickle=False):
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def fetch_reviews(dataset_name, tfidf=False, min_df=None, data_home=None, pickle=False) -> Dataset:
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"""
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Load a Reviews dataset as a Dataset instance, as used in:
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Esuli, A., Moreo, A., and Sebastiani, F. "A recurrent neural network for sentiment quantification."
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@ -91,7 +91,7 @@ def fetch_reviews(dataset_name, tfidf=False, min_df=None, data_home=None, pickle
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return data
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def fetch_twitter(dataset_name, for_model_selection=False, min_df=None, data_home=None, pickle=False):
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def fetch_twitter(dataset_name, for_model_selection=False, min_df=None, data_home=None, pickle=False) -> Dataset:
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"""
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Load a Twitter dataset as a Dataset instance, as used in:
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Gao, W., Sebastiani, F.: From classification to quantification in tweet sentiment analysis.
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@ -162,12 +162,12 @@ def fetch_twitter(dataset_name, for_model_selection=False, min_df=None, data_hom
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return data
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def fetch_UCIDataset(dataset_name, data_home=None, test_split=0.3, verbose=False):
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def fetch_UCIDataset(dataset_name, data_home=None, test_split=0.3, verbose=False) -> Dataset:
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data = fetch_UCILabelledCollection(dataset_name, data_home, verbose)
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return Dataset(*data.split_stratified(1 - test_split, random_state=0))
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def fetch_UCILabelledCollection(dataset_name, data_home=None, verbose=False):
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def fetch_UCILabelledCollection(dataset_name, data_home=None, verbose=False) -> Dataset:
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assert dataset_name in UCI_DATASETS, \
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f'Name {dataset_name} does not match any known dataset from the UCI Machine Learning datasets repository. ' \
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@ -29,13 +29,13 @@ def text2tfidf(dataset:Dataset, min_df=3, sublinear_tf=True, inplace=False, **kw
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test_documents = vectorizer.transform(dataset.test.instances)
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if inplace:
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dataset.training = LabelledCollection(training_documents, dataset.training.labels, dataset.n_classes)
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dataset.test = LabelledCollection(test_documents, dataset.test.labels, dataset.n_classes)
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dataset.training = LabelledCollection(training_documents, dataset.training.labels, dataset.classes_)
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dataset.test = LabelledCollection(test_documents, dataset.test.labels, dataset.classes_)
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dataset.vocabulary = vectorizer.vocabulary_
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return dataset
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else:
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training = LabelledCollection(training_documents, dataset.training.labels.copy(), dataset.n_classes)
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test = LabelledCollection(test_documents, dataset.test.labels.copy(), dataset.n_classes)
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training = LabelledCollection(training_documents, dataset.training.labels.copy(), dataset.classes_)
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test = LabelledCollection(test_documents, dataset.test.labels.copy(), dataset.classes_)
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return Dataset(training, test, vectorizer.vocabulary_)
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@ -66,8 +66,8 @@ def reduce_columns(dataset: Dataset, min_df=5, inplace=False):
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dataset.test.instances = Xte
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return dataset
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else:
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training = LabelledCollection(Xtr, dataset.training.labels.copy(), dataset.n_classes)
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test = LabelledCollection(Xte, dataset.test.labels.copy(), dataset.n_classes)
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training = LabelledCollection(Xtr, dataset.training.labels.copy(), dataset.classes_)
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test = LabelledCollection(Xte, dataset.test.labels.copy(), dataset.classes_)
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return Dataset(training, test)
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@ -100,13 +100,13 @@ def index(dataset: Dataset, min_df=5, inplace=False, **kwargs):
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test_index = indexer.transform(dataset.test.instances)
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if inplace:
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dataset.training = LabelledCollection(training_index, dataset.training.labels, dataset.n_classes)
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dataset.test = LabelledCollection(test_index, dataset.test.labels, dataset.n_classes)
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dataset.training = LabelledCollection(training_index, dataset.training.labels, dataset.classes_)
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dataset.test = LabelledCollection(test_index, dataset.test.labels, dataset.classes_)
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dataset.vocabulary = indexer.vocabulary_
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return dataset
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else:
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training = LabelledCollection(training_index, dataset.training.labels.copy(), dataset.n_classes)
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test = LabelledCollection(test_index, dataset.test.labels.copy(), dataset.n_classes)
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training = LabelledCollection(training_index, dataset.training.labels.copy(), dataset.classes_)
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test = LabelledCollection(test_index, dataset.test.labels.copy(), dataset.classes_)
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return Dataset(training, test, indexer.vocabulary_)
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@ -36,12 +36,12 @@ def prevalence_linspace(n_prevalences=21, repeat=1, smooth_limits_epsilon=0.01):
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return p
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def prevalence_from_labels(labels, n_classes):
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def prevalence_from_labels(labels, classes_):
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if labels.ndim != 1:
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raise ValueError(f'param labels does not seem to be a ndarray of label predictions')
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unique, counts = np.unique(labels, return_counts=True)
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by_class = defaultdict(lambda:0, dict(zip(unique, counts)))
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prevalences = np.asarray([by_class[ci] for ci in range(n_classes)], dtype=np.float)
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prevalences = np.asarray([by_class[class_] for class_ in classes_], dtype=np.float)
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prevalences /= prevalences.sum()
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return prevalences
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@ -51,7 +51,7 @@ def prevalence_from_probabilities(posteriors, binarize: bool = False):
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raise ValueError(f'param posteriors does not seem to be a ndarray of posteior probabilities')
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if binarize:
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predictions = np.argmax(posteriors, axis=-1)
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return prevalence_from_labels(predictions, n_classes=posteriors.shape[1])
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return prevalence_from_labels(predictions, np.arange(posteriors.shape[1]))
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else:
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prevalences = posteriors.mean(axis=0)
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prevalences /= prevalences.sum()
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@ -1,6 +1,7 @@
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from abc import abstractmethod
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from copy import deepcopy
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from typing import Union
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import numpy as np
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from joblib import Parallel, delayed
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from sklearn.base import BaseEstimator
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@ -8,6 +9,7 @@ from sklearn.calibration import CalibratedClassifierCV
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from sklearn.metrics import confusion_matrix
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from sklearn.model_selection import StratifiedKFold
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from tqdm import tqdm
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import quapy as qp
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import quapy.functional as F
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from quapy.classification.svmperf import SVMperf
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@ -43,7 +45,7 @@ class AggregativeQuantifier(BaseQuantifier):
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return self.aggregate(classif_predictions)
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@abstractmethod
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def aggregate(self, classif_predictions:np.ndarray): ...
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def aggregate(self, classif_predictions: np.ndarray): ...
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def get_params(self, deep=True):
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return self.learner.get_params()
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@ -84,7 +86,7 @@ class AggregativeProbabilisticQuantifier(AggregativeQuantifier):
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def set_params(self, **parameters):
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if isinstance(self.learner, CalibratedClassifierCV):
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parameters = {'base_estimator__'+k:v for k,v in parameters.items()}
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parameters = {'base_estimator__' + k: v for k, v in parameters.items()}
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self.learner.set_params(**parameters)
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@property
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@ -98,7 +100,7 @@ def training_helper(learner,
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data: LabelledCollection,
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fit_learner: bool = True,
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ensure_probabilistic=False,
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val_split:Union[LabelledCollection, float]=None):
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val_split: Union[LabelledCollection, float] = None):
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"""
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Training procedure common to all Aggregative Quantifiers.
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:param learner: the learner to be fit
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@ -122,12 +124,13 @@ def training_helper(learner,
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if isinstance(val_split, float):
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if not (0 < val_split < 1):
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raise ValueError(f'train/val split {val_split} out of range, must be in (0,1)')
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train, unused = data.split_stratified(train_prop=1-val_split)
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elif val_split.__class__.__name__ == LabelledCollection.__name__: #isinstance(val_split, LabelledCollection):
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train, unused = data.split_stratified(train_prop=1 - val_split)
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elif val_split.__class__.__name__ == LabelledCollection.__name__: # isinstance(val_split, LabelledCollection):
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train = data
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unused = val_split
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else:
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raise ValueError(f'param "val_split" ({type(val_split)}) not understood; use either a float indicating the split '
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raise ValueError(
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f'param "val_split" ({type(val_split)}) not understood; use either a float indicating the split '
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'proportion, or a LabelledCollection indicating the validation split')
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else:
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train, unused = data, None
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@ -153,7 +156,7 @@ class CC(AggregativeQuantifier):
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attributed each of the classes in order to compute class prevalence estimates.
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"""
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def __init__(self, learner:BaseEstimator):
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def __init__(self, learner: BaseEstimator):
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self.learner = learner
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def fit(self, data: LabelledCollection, fit_learner=True):
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@ -167,16 +170,16 @@ class CC(AggregativeQuantifier):
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return self
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def aggregate(self, classif_predictions):
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return F.prevalence_from_labels(classif_predictions, self.n_classes)
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return F.prevalence_from_labels(classif_predictions, self.classes_)
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class ACC(AggregativeQuantifier):
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def __init__(self, learner:BaseEstimator, val_split=0.4):
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def __init__(self, learner: BaseEstimator, val_split=0.4):
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self.learner = learner
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self.val_split = val_split
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def fit(self, data: LabelledCollection, fit_learner=True, val_split: Union[float, int, LabelledCollection]=None):
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def fit(self, data: LabelledCollection, fit_learner=True, val_split: Union[float, int, LabelledCollection] = None):
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"""
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Trains a ACC quantifier
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:param data: the training set
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@ -262,7 +265,7 @@ class PACC(AggregativeProbabilisticQuantifier):
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self.learner = learner
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self.val_split = val_split
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def fit(self, data: LabelledCollection, fit_learner=True, val_split:Union[float, int, LabelledCollection]=None):
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def fit(self, data: LabelledCollection, fit_learner=True, val_split: Union[float, int, LabelledCollection] = None):
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"""
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Trains a PACC quantifier
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:param data: the training set
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@ -294,7 +297,8 @@ class PACC(AggregativeProbabilisticQuantifier):
|
|||
y_ = np.vstack(y_)
|
||||
|
||||
# fit the learner on all data
|
||||
self.learner, _ = training_helper(self.learner, data, fit_learner, ensure_probabilistic=True, val_split=None)
|
||||
self.learner, _ = training_helper(self.learner, data, fit_learner, ensure_probabilistic=True,
|
||||
val_split=None)
|
||||
|
||||
else:
|
||||
self.learner, val_data = training_helper(
|
||||
|
|
@ -307,8 +311,8 @@ class PACC(AggregativeProbabilisticQuantifier):
|
|||
# estimate the matrix with entry (i,j) being the estimate of P(yi|yj), that is, the probability that a
|
||||
# document that belongs to yj ends up being classified as belonging to yi
|
||||
confusion = np.empty(shape=(data.n_classes, data.n_classes))
|
||||
for yi in range(data.n_classes):
|
||||
confusion[yi] = y_[y==yi].mean(axis=0)
|
||||
for i,class_ in enumerate(data.classes_):
|
||||
confusion[i] = y_[y == class_].mean(axis=0)
|
||||
|
||||
self.Pte_cond_estim_ = confusion.T
|
||||
|
||||
|
|
@ -338,7 +342,7 @@ class EMQ(AggregativeProbabilisticQuantifier):
|
|||
|
||||
def fit(self, data: LabelledCollection, fit_learner=True):
|
||||
self.learner, _ = training_helper(self.learner, data, fit_learner, ensure_probabilistic=True)
|
||||
self.train_prevalence = F.prevalence_from_labels(data.labels, self.n_classes)
|
||||
self.train_prevalence = F.prevalence_from_labels(data.labels, self.classes_)
|
||||
return self
|
||||
|
||||
def aggregate(self, classif_posteriors, epsilon=EPSILON):
|
||||
|
|
@ -366,7 +370,7 @@ class EMQ(AggregativeProbabilisticQuantifier):
|
|||
# M-step:
|
||||
qs = ps.mean(axis=0)
|
||||
|
||||
if qs_prev_ is not None and qp.error.mae(qs, qs_prev_) < epsilon and s>10:
|
||||
if qs_prev_ is not None and qp.error.mae(qs, qs_prev_) < epsilon and s > 10:
|
||||
converged = True
|
||||
|
||||
qs_prev_ = qs
|
||||
|
|
@ -389,7 +393,7 @@ class HDy(AggregativeProbabilisticQuantifier, BinaryQuantifier):
|
|||
self.learner = learner
|
||||
self.val_split = val_split
|
||||
|
||||
def fit(self, data: LabelledCollection, fit_learner=True, val_split: Union[float, LabelledCollection]=None):
|
||||
def fit(self, data: LabelledCollection, fit_learner=True, val_split: Union[float, LabelledCollection] = None):
|
||||
"""
|
||||
Trains a HDy quantifier
|
||||
:param data: the training set
|
||||
|
|
@ -405,13 +409,15 @@ class HDy(AggregativeProbabilisticQuantifier, BinaryQuantifier):
|
|||
self._check_binary(data, self.__class__.__name__)
|
||||
self.learner, validation = training_helper(
|
||||
self.learner, data, fit_learner, ensure_probabilistic=True, val_split=val_split)
|
||||
Px = self.posterior_probabilities(validation.instances)[:,1] # takes only the P(y=+1|x)
|
||||
self.Pxy1 = Px[validation.labels == 1]
|
||||
self.Pxy0 = Px[validation.labels == 0]
|
||||
Px = self.posterior_probabilities(validation.instances)[:, 1] # takes only the P(y=+1|x)
|
||||
self.Pxy1 = Px[validation.labels == self.learner.classes_[1]]
|
||||
self.Pxy0 = Px[validation.labels == self.learner.classes_[0]]
|
||||
# pre-compute the histogram for positive and negative examples
|
||||
self.bins = np.linspace(10, 110, 11, dtype=int) #[10, 20, 30, ..., 100, 110]
|
||||
self.Pxy1_density = {bins: np.histogram(self.Pxy1, bins=bins, range=(0, 1), density=True)[0] for bins in self.bins}
|
||||
self.Pxy0_density = {bins: np.histogram(self.Pxy0, bins=bins, range=(0, 1), density=True)[0] for bins in self.bins}
|
||||
self.bins = np.linspace(10, 110, 11, dtype=int) # [10, 20, 30, ..., 100, 110]
|
||||
self.Pxy1_density = {bins: np.histogram(self.Pxy1, bins=bins, range=(0, 1), density=True)[0] for bins in
|
||||
self.bins}
|
||||
self.Pxy0_density = {bins: np.histogram(self.Pxy0, bins=bins, range=(0, 1), density=True)[0] for bins in
|
||||
self.bins}
|
||||
return self
|
||||
|
||||
def aggregate(self, classif_posteriors):
|
||||
|
|
@ -419,12 +425,12 @@ class HDy(AggregativeProbabilisticQuantifier, BinaryQuantifier):
|
|||
# and the final estimated a priori probability was taken as the median of these 11 estimates."
|
||||
# (González-Castro, et al., 2013).
|
||||
|
||||
Px = classif_posteriors[:,1] # takes only the P(y=+1|x)
|
||||
Px = classif_posteriors[:, 1] # takes only the P(y=+1|x)
|
||||
|
||||
prev_estimations = []
|
||||
#for bins in np.linspace(10, 110, 11, dtype=int): #[10, 20, 30, ..., 100, 110]
|
||||
#Pxy0_density, _ = np.histogram(self.Pxy0, bins=bins, range=(0, 1), density=True)
|
||||
#Pxy1_density, _ = np.histogram(self.Pxy1, bins=bins, range=(0, 1), density=True)
|
||||
# for bins in np.linspace(10, 110, 11, dtype=int): #[10, 20, 30, ..., 100, 110]
|
||||
# Pxy0_density, _ = np.histogram(self.Pxy0, bins=bins, range=(0, 1), density=True)
|
||||
# Pxy1_density, _ = np.histogram(self.Pxy1, bins=bins, range=(0, 1), density=True)
|
||||
for bins in self.bins:
|
||||
Pxy0_density = self.Pxy0_density[bins]
|
||||
Pxy1_density = self.Pxy1_density[bins]
|
||||
|
|
@ -433,14 +439,14 @@ class HDy(AggregativeProbabilisticQuantifier, BinaryQuantifier):
|
|||
|
||||
prev_selected, min_dist = None, None
|
||||
for prev in F.prevalence_linspace(n_prevalences=100, repeat=1, smooth_limits_epsilon=0.0):
|
||||
Px_train = prev*Pxy1_density + (1 - prev)*Pxy0_density
|
||||
Px_train = prev * Pxy1_density + (1 - prev) * Pxy0_density
|
||||
hdy = F.HellingerDistance(Px_train, Px_test)
|
||||
if prev_selected is None or hdy < min_dist:
|
||||
prev_selected, min_dist = prev, hdy
|
||||
prev_estimations.append(prev_selected)
|
||||
|
||||
pos_class_prev = np.median(prev_estimations)
|
||||
return np.asarray([1-pos_class_prev, pos_class_prev])
|
||||
class1_prev = np.median(prev_estimations)
|
||||
return np.asarray([1 - class1_prev, class1_prev])
|
||||
|
||||
|
||||
class ELM(AggregativeQuantifier, BinaryQuantifier):
|
||||
|
|
@ -457,8 +463,8 @@ class ELM(AggregativeQuantifier, BinaryQuantifier):
|
|||
self.learner.fit(data.instances, data.labels)
|
||||
return self
|
||||
|
||||
def aggregate(self, classif_predictions:np.ndarray):
|
||||
return F.prevalence_from_labels(classif_predictions, self.learner.n_classes_)
|
||||
def aggregate(self, classif_predictions: np.ndarray):
|
||||
return F.prevalence_from_labels(classif_predictions, self.classes_)
|
||||
|
||||
def classify(self, X, y=None):
|
||||
return self.learner.predict(X)
|
||||
|
|
@ -470,6 +476,7 @@ class SVMQ(ELM):
|
|||
Quantification-oriented learning based on reliable classifiers.
|
||||
Pattern Recognition, 48(2):591–604.
|
||||
"""
|
||||
|
||||
def __init__(self, svmperf_base=None, **kwargs):
|
||||
super(SVMQ, self).__init__(svmperf_base, loss='q', **kwargs)
|
||||
|
||||
|
|
@ -480,6 +487,7 @@ class SVMKLD(ELM):
|
|||
Optimizing text quantifiers for multivariate loss functions.
|
||||
ACM Transactions on Knowledge Discovery and Data, 9(4):Article 27.
|
||||
"""
|
||||
|
||||
def __init__(self, svmperf_base=None, **kwargs):
|
||||
super(SVMKLD, self).__init__(svmperf_base, loss='kld', **kwargs)
|
||||
|
||||
|
|
@ -490,6 +498,7 @@ class SVMNKLD(ELM):
|
|||
Optimizing text quantifiers for multivariate loss functions.
|
||||
ACM Transactions on Knowledge Discovery and Data, 9(4):Article 27.
|
||||
"""
|
||||
|
||||
def __init__(self, svmperf_base=None, **kwargs):
|
||||
super(SVMNKLD, self).__init__(svmperf_base, loss='nkld', **kwargs)
|
||||
|
||||
|
|
@ -531,7 +540,7 @@ class OneVsAll(AggregativeQuantifier):
|
|||
f'{self.__class__.__name__} expect non-binary data'
|
||||
assert isinstance(self.binary_quantifier, BaseQuantifier), \
|
||||
f'{self.binary_quantifier} does not seem to be a Quantifier'
|
||||
assert fit_learner==True, 'fit_learner must be True'
|
||||
assert fit_learner == True, 'fit_learner must be True'
|
||||
|
||||
self.dict_binary_quantifiers = {c: deepcopy(self.binary_quantifier) for c in data.classes_}
|
||||
self.__parallel(self._delayed_binary_fit, data)
|
||||
|
|
@ -559,11 +568,11 @@ class OneVsAll(AggregativeQuantifier):
|
|||
|
||||
def aggregate(self, classif_predictions_bin):
|
||||
if self.probabilistic:
|
||||
assert classif_predictions_bin.shape[1]==self.n_classes and classif_predictions_bin.shape[2]==2, \
|
||||
assert classif_predictions_bin.shape[1] == self.n_classes and classif_predictions_bin.shape[2] == 2, \
|
||||
'param classif_predictions_bin does not seem to be a valid matrix (ndarray) of posterior ' \
|
||||
'probabilities (2 dimensions) for each document (row) and class (columns)'
|
||||
else:
|
||||
assert set(np.unique(classif_predictions_bin)).issubset({0,1}), \
|
||||
assert set(np.unique(classif_predictions_bin)).issubset({0, 1}), \
|
||||
'param classif_predictions_bin does not seem to be a valid matrix (ndarray) of binary ' \
|
||||
'predictions for each document (row) and class (columns)'
|
||||
prevalences = self.__parallel(self._delayed_binary_aggregate, classif_predictions_bin)
|
||||
|
|
@ -606,7 +615,7 @@ class OneVsAll(AggregativeQuantifier):
|
|||
return self.dict_binary_quantifiers[c].aggregate(classif_predictions[:, c])[1]
|
||||
|
||||
def _delayed_binary_fit(self, c, data):
|
||||
bindata = LabelledCollection(data.instances, data.labels == c, n_classes=2)
|
||||
bindata = LabelledCollection(data.instances, data.labels == c, classes_=[False, True])
|
||||
self.dict_binary_quantifiers[c].fit(bindata)
|
||||
|
||||
@property
|
||||
|
|
@ -616,9 +625,3 @@ class OneVsAll(AggregativeQuantifier):
|
|||
@property
|
||||
def probabilistic(self):
|
||||
return self.binary_quantifier.probabilistic
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -19,8 +19,8 @@ class BaseQuantifier(metaclass=ABCMeta):
|
|||
@abstractmethod
|
||||
def get_params(self, deep=True): ...
|
||||
|
||||
@abstractmethod
|
||||
@property
|
||||
@abstractmethod
|
||||
def classes_(self): ...
|
||||
|
||||
# these methods allows meta-learners to reimplement the decision based on their constituents, and not
|
||||
|
|
|
|||
|
|
@ -7,7 +7,11 @@ from quapy.data.datasets import REVIEWS_SENTIMENT_DATASETS, TWITTER_SENTIMENT_DA
|
|||
@pytest.mark.parametrize('dataset_name', REVIEWS_SENTIMENT_DATASETS)
|
||||
def test_fetch_reviews(dataset_name):
|
||||
dataset = fetch_reviews(dataset_name)
|
||||
print(dataset.n_classes, len(dataset.training), len(dataset.test))
|
||||
print(f'Dataset {dataset_name}')
|
||||
print('Training set stats')
|
||||
dataset.training.stats()
|
||||
print('Test set stats')
|
||||
dataset.test.stats()
|
||||
|
||||
|
||||
@pytest.mark.parametrize('dataset_name', TWITTER_SENTIMENT_DATASETS_TEST + TWITTER_SENTIMENT_DATASETS_TRAIN)
|
||||
|
|
@ -18,7 +22,10 @@ def test_fetch_twitter(dataset_name):
|
|||
if dataset_name == 'semeval' and ve.args[0].startswith(
|
||||
'dataset "semeval" can only be used for model selection.'):
|
||||
dataset = fetch_twitter(dataset_name, for_model_selection=True)
|
||||
print(dataset.n_classes, len(dataset.training), len(dataset.test))
|
||||
print(f'Dataset {dataset_name}')
|
||||
print('Training set stats')
|
||||
dataset.training.stats()
|
||||
print('Test set stats')
|
||||
|
||||
|
||||
@pytest.mark.parametrize('dataset_name', UCI_DATASETS)
|
||||
|
|
@ -28,5 +35,9 @@ def test_fetch_UCIDataset(dataset_name):
|
|||
except FileNotFoundError as fnfe:
|
||||
if dataset_name == 'pageblocks.5' and fnfe.args[0].find(
|
||||
'If this is the first time you attempt to load this dataset') > 0:
|
||||
print('The pageblocks.5 dataset requires some hand processing to be usable, skipping this test.')
|
||||
return
|
||||
print(dataset.n_classes, len(dataset.training), len(dataset.test))
|
||||
print(f'Dataset {dataset_name}')
|
||||
print('Training set stats')
|
||||
dataset.training.stats()
|
||||
print('Test set stats')
|
||||
|
|
|
|||
|
|
@ -1,23 +1,23 @@
|
|||
import numpy
|
||||
import pytest
|
||||
from sklearn.linear_model import LogisticRegression
|
||||
from sklearn.naive_bayes import MultinomialNB
|
||||
from sklearn.svm import LinearSVC
|
||||
|
||||
import quapy as qp
|
||||
from quapy.data import Dataset, LabelledCollection
|
||||
from quapy.method import AGGREGATIVE_METHODS, NON_AGGREGATIVE_METHODS, EXPLICIT_LOSS_MINIMIZATION_METHODS
|
||||
from quapy.method.meta import Ensemble
|
||||
|
||||
datasets = [pytest.param(qp.datasets.fetch_twitter('hcr'), id='hcr'),
|
||||
pytest.param(qp.datasets.fetch_UCIDataset('ionosphere'), id='ionosphere')]
|
||||
|
||||
learners = [LogisticRegression, MultinomialNB, LinearSVC]
|
||||
learners = [LogisticRegression, LinearSVC]
|
||||
|
||||
|
||||
@pytest.mark.parametrize('dataset', datasets)
|
||||
@pytest.mark.parametrize('aggregative_method', AGGREGATIVE_METHODS.difference(EXPLICIT_LOSS_MINIMIZATION_METHODS))
|
||||
@pytest.mark.parametrize('learner', learners)
|
||||
def test_aggregative_methods(dataset, aggregative_method, learner):
|
||||
def test_aggregative_methods(dataset: Dataset, aggregative_method, learner):
|
||||
model = aggregative_method(learner())
|
||||
|
||||
if model.binary and not dataset.binary:
|
||||
|
|
@ -36,7 +36,7 @@ def test_aggregative_methods(dataset, aggregative_method, learner):
|
|||
|
||||
@pytest.mark.parametrize('dataset', datasets)
|
||||
@pytest.mark.parametrize('elm_method', EXPLICIT_LOSS_MINIMIZATION_METHODS)
|
||||
def test_elm_methods(dataset, elm_method):
|
||||
def test_elm_methods(dataset: Dataset, elm_method):
|
||||
try:
|
||||
model = elm_method()
|
||||
except AssertionError as ae:
|
||||
|
|
@ -60,7 +60,7 @@ def test_elm_methods(dataset, elm_method):
|
|||
|
||||
@pytest.mark.parametrize('dataset', datasets)
|
||||
@pytest.mark.parametrize('non_aggregative_method', NON_AGGREGATIVE_METHODS)
|
||||
def test_non_aggregative_methods(dataset, non_aggregative_method):
|
||||
def test_non_aggregative_methods(dataset: Dataset, non_aggregative_method):
|
||||
model = non_aggregative_method()
|
||||
|
||||
if model.binary and not dataset.binary:
|
||||
|
|
@ -81,7 +81,7 @@ def test_non_aggregative_methods(dataset, non_aggregative_method):
|
|||
@pytest.mark.parametrize('learner', learners)
|
||||
@pytest.mark.parametrize('dataset', datasets)
|
||||
@pytest.mark.parametrize('policy', Ensemble.VALID_POLICIES)
|
||||
def test_ensemble_method(base_method, learner, dataset, policy):
|
||||
def test_ensemble_method(base_method, learner, dataset: Dataset, policy):
|
||||
qp.environ['SAMPLE_SIZE'] = len(dataset.training)
|
||||
model = Ensemble(quantifier=base_method(learner()), size=5, policy=policy, n_jobs=-1)
|
||||
if model.binary and not dataset.binary:
|
||||
|
|
@ -100,10 +100,12 @@ def test_ensemble_method(base_method, learner, dataset, policy):
|
|||
|
||||
def test_quanet_method():
|
||||
dataset = qp.datasets.fetch_reviews('kindle', pickle=True)
|
||||
dataset = Dataset(dataset.training.sampling(100, *dataset.training.prevalence()),
|
||||
dataset.test.sampling(100, *dataset.test.prevalence()))
|
||||
qp.data.preprocessing.index(dataset, min_df=5, inplace=True)
|
||||
|
||||
from quapy.classification.neural import CNNnet
|
||||
cnn = CNNnet(dataset.vocabulary_size, dataset.n_classes)
|
||||
cnn = CNNnet(dataset.vocabulary_size, dataset.training.n_classes)
|
||||
|
||||
from quapy.classification.neural import NeuralClassifierTrainer
|
||||
learner = NeuralClassifierTrainer(cnn, device='cuda')
|
||||
|
|
@ -123,3 +125,50 @@ def test_quanet_method():
|
|||
error = qp.error.mae(true_prevalences, estim_prevalences)
|
||||
|
||||
assert type(error) == numpy.float64
|
||||
|
||||
|
||||
def models_to_test_for_str_label_names():
|
||||
models = list()
|
||||
learner = LogisticRegression
|
||||
for method in AGGREGATIVE_METHODS.difference(EXPLICIT_LOSS_MINIMIZATION_METHODS):
|
||||
models.append(method(learner()))
|
||||
for method in NON_AGGREGATIVE_METHODS:
|
||||
models.append(method())
|
||||
return models
|
||||
|
||||
|
||||
@pytest.mark.parametrize('model', models_to_test_for_str_label_names())
|
||||
def test_str_label_names(model):
|
||||
dataset = qp.datasets.fetch_reviews('imdb', pickle=True)
|
||||
dataset = Dataset(dataset.training.sampling(1000, *dataset.training.prevalence()),
|
||||
dataset.test.sampling(1000, *dataset.test.prevalence()))
|
||||
qp.data.preprocessing.text2tfidf(dataset, min_df=5, inplace=True)
|
||||
|
||||
model.fit(dataset.training)
|
||||
|
||||
int_estim_prevalences = model.quantify(dataset.test.instances)
|
||||
true_prevalences = dataset.test.prevalence()
|
||||
|
||||
error = qp.error.mae(true_prevalences, int_estim_prevalences)
|
||||
assert type(error) == numpy.float64
|
||||
|
||||
dataset_str = Dataset(LabelledCollection(dataset.training.instances,
|
||||
['one' if label == 1 else 'zero' for label in dataset.training.labels]),
|
||||
LabelledCollection(dataset.test.instances,
|
||||
['one' if label == 1 else 'zero' for label in dataset.test.labels]))
|
||||
|
||||
model.fit(dataset_str.training)
|
||||
|
||||
str_estim_prevalences = model.quantify(dataset_str.test.instances)
|
||||
true_prevalences = dataset_str.test.prevalence()
|
||||
|
||||
error = qp.error.mae(true_prevalences, str_estim_prevalences)
|
||||
assert type(error) == numpy.float64
|
||||
|
||||
print(true_prevalences)
|
||||
print(int_estim_prevalences)
|
||||
print(str_estim_prevalences)
|
||||
|
||||
numpy.testing.assert_almost_equal(int_estim_prevalences[1],
|
||||
str_estim_prevalences[list(model.classes_).index('one')])
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue