def test_fit_sample_check_voting():
cc = ClusterCentroids(random_state=RND_SEED)
cc.fit_sample(X, Y)
assert cc.voting_ == 'soft'
cc = ClusterCentroids(random_state=RND_SEED)
cc.fit_sample(sparse.csr_matrix(X), Y)
assert cc.voting_ == 'hard'
def test_fit_sample_check_voting():
cc = ClusterCentroids(random_state=RND_SEED)
cc.fit_sample(X, Y)
assert cc.voting_ == 'soft'
cc = ClusterCentroids(random_state=RND_SEED)
cc.fit_sample(sparse.csr_matrix(X), Y)
assert cc.voting_ == 'hard'
def test_fit_sample_error():
ratio = 'auto'
cluster = 'rnd'
cc = ClusterCentroids(
ratio=ratio, random_state=RND_SEED, estimator=cluster)
with raises(ValueError, match="has to be a KMeans clustering"):
cc.fit_sample(X, Y)
voting = 'unknown'
cc = ClusterCentroids(ratio=ratio, voting=voting, random_state=RND_SEED)
with raises(ValueError, match="needs to be one of"):
cc.fit_sample(X, Y)
def test_fit_sample_error():
ratio = 'auto'
cluster = 'rnd'
cc = ClusterCentroids(ratio=ratio,
random_state=RND_SEED,
estimator=cluster)
with raises(ValueError, match="has to be a KMeans clustering"):
cc.fit_sample(X, Y)
voting = 'unknown'
cc = ClusterCentroids(ratio=ratio, voting=voting, random_state=RND_SEED)
with raises(ValueError, match="needs to be one of"):
cc.fit_sample(X, Y)
def buildModel(clf, X, y, cv_nums=10, is_random=False):
# 是否打乱数据
if is_random == True:
random_lst = list(np.random.randint(0, 1000, 4))
elif is_random == False:
random_lst = [0] * 4
print('----------各种类别不平衡处理方法结果, 为' + str(cv_nums) + '折交叉验证的f1均值----------')
# 不做处理，使用原始数据集做预测
print('原始数据集: ', np.mean(cross_val_score(clf, X, y, scoring='f1', cv=cv_nums)))
ros = RandomOverSampler(random_state=random_lst[0])
X_oversampled, y_oversampled = ros.fit_sample(X, y)
# print(sorted(Counter(y_oversampled).items()))
print('过采样: ', np.mean(cross_val_score(clf, X_oversampled, y_oversampled, scoring='f1', cv=cv_nums)))
cc = ClusterCentroids(random_state=random_lst[1])
X_undersampled, y_undersampled = cc.fit_sample(X, y)
#print(sorted(Counter(y_undersampled).items()))
print('欠采样: ', np.mean(cross_val_score(clf, X_undersampled, y_undersampled, scoring='f1', cv=cv_nums)))
sm = SMOTE(random_state=random_lst[2])
X_smote, y_smote = sm.fit_sample(X, y)
#print(sorted(Counter(y_smote).items()))
print('SMOTE: ', np.mean(cross_val_score(clf, X_smote, y_smote, scoring='f1', cv=cv_nums)))
# 将样本多的类别划分为若干个集合供不同学习器使用，这样对每个学习器来看都进行了欠采样，
# 但在全局来看却不会丢失重要信息，假设将负样本的类别划分为10份，正样本的类别只有1份，
# 这样训练10个学习器，每个学习器使用1份负样本和1份正样本，正样本共用
ee = EasyEnsemble(random_state=random_lst[3], n_subsets=10)
X_ee, y_ee = ee.fit_sample(X, y)
def test_fit_sample_auto():
ratio = 'auto'
cc = ClusterCentroids(ratio=ratio, random_state=RND_SEED)
X_resampled, y_resampled = cc.fit_sample(X, Y)
X_gt = np.array([[0.92923648, 0.76103773], [0.47104475, 0.44386323],
[0.13347175, 0.12167502], [0.06738818, -0.529627],
[0.17901516, 0.69860992], [0.094035, -2.55298982]])
y_gt = np.array([0, 0, 0, 1, 1, 1])
assert_allclose(X_resampled, X_gt, rtol=R_TOL)
assert_array_equal(y_resampled, y_gt)
def test_multiclass_fit_sample():
y = Y.copy()
y[5] = 2
y[6] = 2
cc = ClusterCentroids(random_state=RND_SEED)
X_resampled, y_resampled = cc.fit_sample(X, y)
count_y_res = Counter(y_resampled)
assert count_y_res[0] == 2
assert count_y_res[1] == 2
assert count_y_res[2] == 2
def test_multiclass_fit_sample():
y = Y.copy()
y[5] = 2
y[6] = 2
cc = ClusterCentroids(random_state=RND_SEED)
X_resampled, y_resampled = cc.fit_sample(X, y)
count_y_res = Counter(y_resampled)
assert count_y_res[0] == 2
assert count_y_res[1] == 2
assert count_y_res[2] == 2
def test_fit_sample_half():
ratio = .5
cc = ClusterCentroids(ratio=ratio, random_state=RND_SEED)
X_resampled, y_resampled = cc.fit_sample(X, Y)
X_gt = np.array([[0.92923648, 0.76103773], [0.47104475, 0.44386323],
[0.13347175, 0.12167502], [0.09125309, -0.85409574],
[0.19220316, 0.32337101], [0.094035, -2.55298982],
[0.20792588, 1.49407907], [0.04352327, -0.20515826],
[0.12372842, 0.6536186]])
y_gt = np.array([0, 0, 0, 1, 1, 1, 1, 1, 1])
assert_allclose(X_resampled, X_gt, rtol=R_TOL)
assert_array_equal(y_resampled, y_gt)
def test_fit_sample_auto():
ratio = 'auto'
cc = ClusterCentroids(ratio=ratio, random_state=RND_SEED)
X_resampled, y_resampled = cc.fit_sample(X, Y)
X_gt = np.array([[0.92923648, 0.76103773],
[0.47104475, 0.44386323],
[0.13347175, 0.12167502],
[0.06738818, -0.529627],
[0.17901516, 0.69860992],
[0.094035, -2.55298982]])
y_gt = np.array([0, 0, 0, 1, 1, 1])
assert_allclose(X_resampled, X_gt, rtol=R_TOL)
assert_array_equal(y_resampled, y_gt)
def test_multiclass_fit_sample():
# Make y to be multiclass
y = Y.copy()
y[5] = 2
y[6] = 2
# Resample the data
cc = ClusterCentroids(random_state=RND_SEED)
X_resampled, y_resampled = cc.fit_sample(X, y)
# Check the size of y
count_y_res = Counter(y_resampled)
assert_equal(count_y_res[0], 2)
assert_equal(count_y_res[1], 2)
assert_equal(count_y_res[2], 2)
def test_fit_sample_object():
sampling_strategy = 'auto'
cluster = KMeans(random_state=RND_SEED)
cc = ClusterCentroids(
sampling_strategy=sampling_strategy,
random_state=RND_SEED,
estimator=cluster)
X_resampled, y_resampled = cc.fit_sample(X, Y)
X_gt = np.array([[0.92923648, 0.76103773], [0.47104475, 0.44386323],
[0.13347175, 0.12167502], [0.06738818, -0.529627],
[0.17901516, 0.69860992], [0.094035, -2.55298982]])
y_gt = np.array([0, 0, 0, 1, 1, 1])
assert_allclose(X_resampled, X_gt, rtol=R_TOL)
assert_array_equal(y_resampled, y_gt)
def test_multiclass_fit_sample():
"""Test fit sample method with multiclass target"""
# Make y to be multiclass
y = Y.copy()
y[0:1000] = 2
# Resample the data
cc = ClusterCentroids(random_state=RND_SEED)
X_resampled, y_resampled = cc.fit_sample(X, y)
# Check the size of y
count_y_res = Counter(y_resampled)
assert_equal(count_y_res[0], 400)
assert_equal(count_y_res[1], 400)
assert_equal(count_y_res[2], 400)
def test_multiclass_fit_sample():
"""Test fit sample method with multiclass target"""
# Make y to be multiclass
y = Y.copy()
y[0:1000] = 2
# Resample the data
cc = ClusterCentroids(random_state=RND_SEED)
X_resampled, y_resampled = cc.fit_sample(X, y)
# Check the size of y
count_y_res = Counter(y_resampled)
assert_equal(count_y_res[0], 400)
assert_equal(count_y_res[1], 400)
assert_equal(count_y_res[2], 400)
def UnderSample(X, Y, method='Random', random_state=42):
if X.size == len(X):
X = X.reshape(-1, 1)
if method is 'Cluster': # 默认kmeans估计器
sampler = ClusterCentroids(ratio='auto',
random_state=random_state,
estimator=None)
elif method is 'Random':
sampler = RandomUnderSampler(ratio='auto',
random_state=random_state,
replacement=False)
elif method is 'NearMiss_1':
sampler = NearMiss(ratio='auto', random_state=random_state, version=1)
elif method is 'NearMiss_2':
sampler = NearMiss(ratio='auto', random_state=random_state, version=2)
elif method is 'NearMiss_3':
sampler = NearMiss(ratio='auto', random_state=random_state, version=3)
elif method is 'TomekLinks':
sampler = TomekLinks(ratio='auto', random_state=random_state)
elif method is 'ENN': # kind_sel可取'all'和'mode'
sampler = EditedNearestNeighbours(ratio='auto',
random_state=random_state,
kind_sel='all')
elif method is 'RENN': # kind_sel可取'all'和'mode'
sampler = RepeatedEditedNearestNeighbours(ratio='auto',
random_state=random_state,
kind_sel='all')
elif method is 'All_KNN':
sampler = AllKNN(ratio='auto',
random_state=random_state,
kind_sel='all')
elif method is 'CNN':
sampler = CondensedNearestNeighbour(ratio='auto',
random_state=random_state)
elif method is 'One_SS':
sampler = OneSidedSelection(ratio='auto', random_state=random_state)
elif method is 'NCR':
sampler = NeighbourhoodCleaningRule(ratio='auto',
random_state=random_state,
kind_sel='all',
threshold_cleaning=0.5)
elif method is 'IHT':
sampler = InstanceHardnessThreshold(estimator=None,
ratio='auto',
random_state=random_state)
X_resampled, Y_resampled = sampler.fit_sample(X, Y)
return X_resampled, Y_resampled
def test_fit_sample_half():
"""Test fit and sample routines with ratio of .5"""
# Define the parameter for the under-sampling
ratio = .5
# Create the object
cc = ClusterCentroids(ratio=ratio, random_state=RND_SEED)
# Fit and sample
X_resampled, y_resampled = cc.fit_sample(X, Y)
currdir = os.path.dirname(os.path.abspath(__file__))
X_gt = np.load(os.path.join(currdir, 'data', 'cc_x_05.npy'))
y_gt = np.load(os.path.join(currdir, 'data', 'cc_y_05.npy'))
assert_array_equal(X_resampled, X_gt)
assert_array_equal(y_resampled, y_gt)
def test_fit_sample_half():
"""Test fit and sample routines with ratio of .5"""
# Define the parameter for the under-sampling
ratio = .5
# Create the object
cc = ClusterCentroids(ratio=ratio, random_state=RND_SEED)
# Fit and sample
X_resampled, y_resampled = cc.fit_sample(X, Y)
currdir = os.path.dirname(os.path.abspath(__file__))
X_gt = np.load(os.path.join(currdir, 'data', 'cc_x_05.npy'))
y_gt = np.load(os.path.join(currdir, 'data', 'cc_y_05.npy'))
assert_array_equal(X_resampled, X_gt)
assert_array_equal(y_resampled, y_gt)
def test_fit_sample_half():
ratio = {0: 3, 1: 6}
cc = ClusterCentroids(ratio=ratio, random_state=RND_SEED)
X_resampled, y_resampled = cc.fit_sample(X, Y)
X_gt = np.array([[0.92923648, 0.76103773],
[0.13347175, 0.12167502],
[0.47104475, 0.44386323],
[0.09125309, -0.85409574],
[0.19220316, 0.32337101],
[0.094035, -2.55298982],
[0.20792588, 1.49407907],
[0.04352327, -0.20515826],
[0.12372842, 0.6536186]])
y_gt = np.array([0, 0, 0, 1, 1, 1, 1, 1, 1])
print(X_resampled)
assert_allclose(X_resampled, X_gt, rtol=R_TOL)
assert_array_equal(y_resampled, y_gt)
def kmeans_undersample(self): ''' Undersample majority class with its centroids ''' df = self.data cc = ClusterCentroids(voting='soft', n_jobs=-1) data = df[self.features].as_matrix() labels = df['label'] data_resampled, label_resampled = cc.fit_sample(data, labels) df2 = pd.DataFrame(data_resampled.tolist(),columns=self.features) df2['label'] = label_resampled df2['cluster'] = 0 df2['original'] = 0 return df2
def test_fit_hard_voting():
ratio = 'auto'
voting = 'hard'
cluster = KMeans(random_state=RND_SEED)
cc = ClusterCentroids(ratio=ratio,
random_state=RND_SEED,
estimator=cluster,
voting=voting)
X_resampled, y_resampled = cc.fit_sample(X, Y)
X_gt = np.array([[0.92923648, 0.76103773], [0.47104475, 0.44386323],
[0.13347175, 0.12167502], [0.09125309, -0.85409574],
[0.12372842, 0.6536186], [0.094035, -2.55298982]])
y_gt = np.array([0, 0, 0, 1, 1, 1])
assert_allclose(X_resampled, X_gt, rtol=R_TOL)
assert_array_equal(y_resampled, y_gt)
for x in X_resampled:
assert np.any(np.all(x == X, axis=1))
def test_fit_sample_auto():
"""Test fit and sample routines with auto ratio"""
# Define the parameter for the under-sampling
ratio = 'auto'
# Create the object
cc = ClusterCentroids(ratio=ratio, random_state=RND_SEED)
# Fit and sample
X_resampled, y_resampled = cc.fit_sample(X, Y)
X_gt = np.array([[0.92923648, 0.76103773], [0.47104475, 0.44386323],
[0.13347175, 0.12167502], [0.06738818, -0.529627],
[0.17901516, 0.69860992], [0.094035, -2.55298982]])
y_gt = np.array([0, 0, 0, 1, 1, 1])
assert_array_almost_equal(X_resampled, X_gt)
assert_array_equal(y_resampled, y_gt)
def test_fit_sample_auto():
"""Test fit and sample routines with auto ratio"""
# Define the parameter for the under-sampling
ratio = 'auto'
# Create the object
cc = ClusterCentroids(ratio=ratio, random_state=RND_SEED)
# Fit and sample
X_resampled, y_resampled = cc.fit_sample(X, Y)
X_gt = np.array([[0.92923648, 0.76103773], [0.47104475, 0.44386323],
[0.13347175, 0.12167502], [0.06738818, -0.529627],
[0.17901516, 0.69860992], [0.094035, -2.55298982]])
y_gt = np.array([0, 0, 0, 1, 1, 1])
assert_array_almost_equal(X_resampled, X_gt)
assert_array_equal(y_resampled, y_gt)
def precalculate_nearest_neighbors(
reference_taxonomy: Series, reference_sequences: DNAIterator,
max_centroids_per_class: int=10,
feature_extractor_specification: str=_default_feature_extractor,
knn_classifier_specification: str=_default_knn_classifier,
n_jobs: int=1, random_state: int=42) -> dict:
spec = json.loads(feature_extractor_specification)
feat_ext = pipeline_from_spec(spec)
if not isinstance(feat_ext.steps[-1][-1], TransformerMixin):
raise ValueError('feature_extractor_specification must specify a '
'transformer')
spec = json.loads(knn_classifier_specification)
nn = pipeline_from_spec(spec)
if not isinstance(nn.steps[-1][-1], KNeighborsMixin):
raise ValueError('knn_classifier_specification must specifiy a '
'KNeighbors classifier')
seq_ids, X = _extract_reads(reference_sequences)
data = [(reference_taxonomy[s], x)
for s, x in zip(seq_ids, X) if s in reference_taxonomy]
y, X = list(zip(*data))
X = feat_ext.transform(X)
if max_centroids_per_class > 0:
class_counts = Counter(y)
undersample_classes = {t: max_centroids_per_class
for t, c in class_counts.items()
if c > max_centroids_per_class}
cc = ClusterCentroids(random_state=random_state, n_jobs=n_jobs,
ratio=undersample_classes, voting='hard')
X_resampled, y_resampled = cc.fit_sample(X, y)
else:
X_resampled, y_resampled = X, y
if 'n_jobs' in nn.steps[-1][-1].get_params():
nn.steps[-1][-1].set_params(n_jobs=n_jobs)
nn.fit(X_resampled)
nn = nn.steps[-1][-1]
if n_jobs != 1 and hasattr(X_resampled, 'todense'):
indices = nn.kneighbors(X_resampled.todense(), return_distance=False)
else:
indices = nn.kneighbors(X_resampled, return_distance=False)
return {'neighbors': indices.tolist(), 'taxonomies': y_resampled.tolist()}
def test_fit_sample_object():
# Define the parameter for the under-sampling
ratio = 'auto'
# Create the object
cluster = KMeans(random_state=RND_SEED)
cc = ClusterCentroids(ratio=ratio,
random_state=RND_SEED,
estimator=cluster)
# Fit and sample
X_resampled, y_resampled = cc.fit_sample(X, Y)
X_gt = np.array([[0.92923648, 0.76103773], [0.47104475, 0.44386323],
[0.13347175, 0.12167502], [0.06738818, -0.529627],
[0.17901516, 0.69860992], [0.094035, -2.55298982]])
y_gt = np.array([0, 0, 0, 1, 1, 1])
assert_allclose(X_resampled, X_gt, rtol=R_TOL)
assert_array_equal(y_resampled, y_gt)
def undersample_cluster_centroid(X,
y,
label='Cluster Centroids under-sampling',
plot=False,
sampling_strategy='auto',
random_state=None,
estimator=None,
voting='auto',
n_jobs=-1,
ratio=None):
'''
voting:str, optional (default=’auto’)
Voting strategy to generate the new samples:
If 'hard', the nearest-neighbors of the centroids found using the clustering algorithm will be used.
If 'soft', the centroids found by the clustering algorithm will be used.
'''
cc = ClusterCentroids(sampling_strategy=sampling_strategy,
random_state=random_state,
estimator=estimator,
voting=voting,
n_jobs=n_jobs,
ratio=ratio)
X_cc, y_cc = cc.fit_sample(X, y)
X_cc = pd.DataFrame(X_cc, columns=X.columns)
y_cc = pd.Series(y_cc, name=y.name)
if plot == True:
# plotting using pca
pca = PCA(n_components=2)
X_pca = pd.DataFrame(pca.fit_transform(X_cc))
colors = ['#1F77B4', '#FF7F0E']
markers = ['o', 's']
for l, c, m in zip(np.unique(y_cc), colors, markers):
plt.scatter(
X_pca.loc[y_cc.sort_index() == l, 0], # pc 1
X_pca.loc[y_cc.sort_index() == l, 1], # pc 2
c=c,
label=l,
marker=m)
plt.title(label)
plt.legend(loc='upper right')
plt.show()
return X_cc, y_cc, cc
def test_fit_hard_voting():
ratio = 'auto'
voting = 'hard'
cluster = KMeans(random_state=RND_SEED)
cc = ClusterCentroids(
ratio=ratio, random_state=RND_SEED, estimator=cluster,
voting=voting)
X_resampled, y_resampled = cc.fit_sample(X, Y)
X_gt = np.array([[0.92923648, 0.76103773],
[0.47104475, 0.44386323],
[0.13347175, 0.12167502],
[0.09125309, -0.85409574],
[0.12372842, 0.6536186],
[0.094035, -2.55298982]])
y_gt = np.array([0, 0, 0, 1, 1, 1])
assert_allclose(X_resampled, X_gt, rtol=R_TOL)
assert_array_equal(y_resampled, y_gt)
for x in X_resampled:
assert np.any(np.all(x == X, axis=1))
def test_fit_sample_half():
"""Test fit and sample routines with ratio of .5"""
# Define the parameter for the under-sampling
ratio = .5
# Create the object
cc = ClusterCentroids(ratio=ratio, random_state=RND_SEED)
# Fit and sample
X_resampled, y_resampled = cc.fit_sample(X, Y)
X_gt = np.array([[0.92923648, 0.76103773], [0.47104475, 0.44386323],
[0.13347175, 0.12167502], [0.09125309, -0.85409574],
[0.19220316, 0.32337101], [0.094035, -2.55298982],
[0.20792588, 1.49407907], [0.04352327, -0.20515826],
[0.12372842, 0.6536186]])
y_gt = np.array([0, 0, 0, 1, 1, 1, 1, 1, 1])
assert_array_almost_equal(X_resampled, X_gt)
assert_array_equal(y_resampled, y_gt)
def test_fit_sample_half():
"""Test fit and sample routines with ratio of .5"""
# Define the parameter for the under-sampling
ratio = .5
# Create the object
cc = ClusterCentroids(ratio=ratio, random_state=RND_SEED)
# Fit and sample
X_resampled, y_resampled = cc.fit_sample(X, Y)
X_gt = np.array([[0.92923648, 0.76103773], [0.47104475, 0.44386323],
[0.13347175, 0.12167502], [0.09125309, -0.85409574],
[0.19220316, 0.32337101], [0.094035, -2.55298982],
[0.20792588, 1.49407907], [0.04352327, -0.20515826],
[0.12372842, 0.6536186]])
y_gt = np.array([0, 0, 0, 1, 1, 1, 1, 1, 1])
assert_array_almost_equal(X_resampled, X_gt)
assert_array_equal(y_resampled, y_gt)
def createUnderAndOverSample(given_data, outputdata_filename, max_len, codebook):
dataX = []
dataY = []
for xx in given_data:
dataX.append(xx[0:-1])
dataY.append(xx[-1])
X = pad_sequences(dataX, maxlen=max_len, dtype='float32')
X_norm = X / (float(len(codebook)))
y_norm = numpy.array(dataY)
# perform over or under sampling
sm_over = SMOTE(kind='borderline2')
X_res_over, y_res_over = sm_over.fit_sample(X_norm, y_norm)
sm_under = ClusterCentroids()
X_res_under, y_res_under = sm_under.fit_sample(X_norm, y_norm)
X_d_under = X_res_under * (float(len(codebook)))
X_d_over = X_res_over * (float(len(codebook)))
writeSampledSequences(X_d_under, y_res_under, codebook, "under/"+outputdata_filename)
writeSampledSequences(X_d_over, y_res_over, codebook, "over/"+outputdata_filename)
class ClassRebalancer(DataStorer):
'''
Class that rebalances the classes according to the sampling_strategy and balance_method during initialization
This will help us reduce volume of data to compute without losing information about decision boundary
'''
def __init__(self, balance_method_name='undersample_centroid', sampling_strategy=0.5, *args, **kwargs):
'''
Init balance_method_name for class that easy to check which used, rebalance classes
and init DataStorer with data contained in *args and **kwargs
:param balance_method_name: str
define the name of rebalance method (imblearn)
:param sampling_strategy: float or str ('auto')
define of desire balance classes ratio after rebalancing
:param args: tuple
here should be X, y for init DataStorer Class
:param kwargs: dict
here should be X, y for init DataStorer Class
'''
self.balance_method_name = balance_method_name
super().__init__(*args, **kwargs) # here init DataStorer for further potentially using it in rebalance_classes
if self.balance_method_name == 'undersample_centroid':
self.balance_method = ClusterCentroids(sampling_strategy=sampling_strategy)
self.rebalance_classes()
else:
print(f'balance_method_name: {self.balance_method_name} doesnt fit. Сlasses were not rebalanced')
def rebalance_classes(self, ):
'''
Just rebalances the data and displays information about changes in class balance
'''
print(f'Changing balances from {Counter(self.y).items()}')
self.X, self.y = self.balance_method.fit_sample(self.X, self.y)
print(f'to {Counter(self.y).items()}')
def learning(self):
self.models = []
self.alphas = []
N, _ = self.X.shape
W = np.ones(N) / N
for i in range(self.k):
print(i)
cus = ClusterCentroids(ratio='majority')
x_undersampled, y_undersampled = cus.fit_sample(self.X, self.Y)
cl = tree.DecisionTreeClassifier(splitter='best')
cl.fit(x_undersampled, y_undersampled)
P = cl.predict(self.X)
err = np.sum(W[P != self.Y])
if err > 0.5:
i = i - 1
if err <= 0:
err = 0.0000001
else:
try:
if (np.log(1 - err) - np.log(err)) == 0:
alpha = 0
else:
alpha = 0.5 * (np.log(1 - err) - np.log(err))
W = W * np.exp(-alpha * Y * P) # vectorized form
W = W / W.sum() # normalize so it sums to 1
except:
alpha = 0
# W = W * np.exp(-alpha * Y * P) # vectorized form
W = W / W.sum() # normalize so it sums to 1
self.models.append(cl)
self.alphas.append(alpha)
不同的是,对于 Borderline-2 SMOTE,随机样本b可以是属于任何一个类的样本; SVM SMOTE:kind='svm',使用支持向量机分类器产生支持向量然后再生成新的少数类样本. ''' ''' 下采样(Under-sampling) 原型生成(prototype generation) 给定数据集S,原型生成算法将生成一个子集S’,其中|S’|<|S|,但是子集并非来自于原始数据集. 意思就是说:原型生成方法将减少数据集的样本数量,剩下的样本是由原始数据集生成的,而不是直接来源于原始数据集. ClusterCentroids函数实现了上述功能: 每一个类别的样本都会用K-Means算法的中心点来进行合成, 而不是随机从原始样本进行抽取. ''' from imblearn.under_sampling import ClusterCentroids cc = ClusterCentroids(random_state=0) X_resampled, y_resampled = cc.fit_sample(X, y) print(sorted(Counter(y_resampled).items())) # ClusterCentroids函数提供了一种很高效的方法来减少样本的数量, 但需要注意的是, 该方法要求原始数据集最好能聚类成簇. # 此外, 中心点的数量应该设置好, 这样下采样的簇能很好地代表原始数据. ''' 原型选择(prototype selection) 与原型生成不同的是, 原型选择算法是直接从原始数据集中进行抽取. 抽取的方法大概可以分为两类:(i)可控的下采样技术(the controlled under-sampling techniques) (ii)the cleaning under-sampling techniques 第一类的方法可以由用户指定下采样抽取的子集中样本的数量;第二类方法则不接受这种用户的干预. ''' #RandomUnderSampler函数是一种快速并十分简单的方式来平衡各个类别的数据: 随机选取数据的子集. from imblearn.under_sampling import RandomUnderSampler#下采样函数 rus = RandomUnderSampler(random_state=0) X_resampled, y_resampled = rus.fit_sample(X, y) print(sorted(Counter(y_resampled).items()))
from imblearn.under_sampling import ClusterCentroids
# Generate the dataset
X, y = make_classification(n_classes=2, class_sep=2, weights=[0.1, 0.9],
n_informative=3, n_redundant=1, flip_y=0,
n_features=20, n_clusters_per_class=1,
n_samples=5000, random_state=10)
# Instanciate a PCA object for the sake of easy visualisation
pca = PCA(n_components=2)
# Fit and transform x to visualise inside a 2D feature space
X_vis = pca.fit_transform(X)
# Apply Cluster Centroids
cc = ClusterCentroids()
X_resampled, y_resampled = cc.fit_sample(X, y)
X_res_vis = pca.transform(X_resampled)
# Two subplots, unpack the axes array immediately
f, (ax1, ax2) = plt.subplots(1, 2)
ax1.scatter(X_vis[y == 0, 0], X_vis[y == 0, 1], label="Class #0", alpha=0.5,
edgecolor=almost_black, facecolor=palette[0], linewidth=0.15)
ax1.scatter(X_vis[y == 1, 0], X_vis[y == 1, 1], label="Class #1", alpha=0.5,
edgecolor=almost_black, facecolor=palette[2], linewidth=0.15)
ax1.set_title('Original set')
ax2.scatter(X_res_vis[y_resampled == 0, 0], X_res_vis[y_resampled == 0, 1],
label="Class #0", alpha=.5, edgecolor=almost_black,
facecolor=palette[0], linewidth=0.15)
ax2.scatter(X_res_vis[y_resampled == 1, 0], X_res_vis[y_resampled == 1, 1],
import sys, os, csv
from imblearn.under_sampling import ClusterCentroids
input_csv_file = sys.argv[1]
input_csv = input_csv_file.split(".csv")[0]
with open(input_csv_file, newline="") as input_file:
reader = csv.reader(input_file, delimiter=',')
with open(input_csv + "-cc-.csv", 'w', newline='') as output_file:
writer = csv.writer(output_file, delimiter=',')
skip_header = True
X = []
y = []
cc = ClusterCentroids()
for x in reader:
if skip_header:
skip_header = False
continue
y.append(x[-1])
X.append(list(map(int, x[:len(x) - 1])))
#print (X)
X_res, y_res = cc.fit_sample(X, y)
print (len(X_res))
print (len(y_res))
for idx, s in enumerate(X_res):
#print (list(s) + list(y_res[idx]))
writer.writerow(list(s) + list(y_res[idx]))
#break;
print("")
print('-----------------')
best_dict[imbalance] = [clf, roc_auc_score(y_test, clf.predict(X_test))]
#analysis with just cluster centroids(best imbalancer)
classifiers = [LogisticRegression(), SVC(probability=True),
GaussianNB(), DecisionTreeClassifier(), RandomForestClassifier(),
KNeighborsClassifier(n_neighbors=6)]
cc = ClusterCentroids()
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.3,
random_state=4444)
X_train, y_train = cc.fit_sample(X_train, y_train)
fprs,tprs,roc_aucs = [],[],[]
for clf in classifiers:
clf.fit(X_train,y_train)
y_pred = clf.predict_proba(X_test)[:,1]
y_true = y_test
fpr, tpr, _ = roc_curve(y_true, y_pred)
roc_auc = auc(fpr, tpr)
fprs.append(fpr)
tprs.append(tpr)
roc_aucs.append(roc_auc)
'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct',
'Nov', 'Dec'
],
ordered=True,
inplace=True)
# Convert data in test set
apply_cats(df=df_test, trn=df_raw)
# Convert category to numerical and replace missing data
df, y, nas = proc_df(df_raw, 'FraudFound_P')
X_test, _, nas = proc_df(df_test, na_dict=nas)
df, y, nas = proc_df(df_raw, 'FraudFound_P', na_dict=nas)
# Undersample majority class
cc = ClusterCentroids(ratio={0: 6650}, n_jobs=-1)
X_cc_full, y_cc_full = cc.fit_sample(df, y)
plot_2d_space(X_cc, y_cc, 'Cluster Centroids under-sampling')
# Model(LGBoost)
lgb_train = lgb.Dataset(X_cc_full, y_cc_full, free_raw_data=False)
# Parametes for lgboost
parameters = {
'num_leaves': 2**5,
'learning_rate': 0.05,
'is_unbalance': True,
'min_split_gain': 0.03,
'min_child_weight': 1,
'reg_lambda': 1,
'subsample': 1,
'objective': 'binary',
'task': 'train'
plt.text(j, i, cm[i, j],
horizontalalignment="center",
color="white" if cm[i, j] > thresh else "black")
plt.tight_layout()
plt.ylabel('True label')
plt.xlabel('Predicted label')
#define X y
X, y = data.loc[:,data.columns != 'state'].values, data.loc[:,data.columns == 'state'].values
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.3, random_state=0)
#ClusterCentroids
cc = ClusterCentroids(random_state=0)
os_X,os_y = cc.fit_sample(X_train,y_train)
#XGboost
clf_XG = XGBClassifier(learning_rate= 0.3, min_child_weight=1,
max_depth=6,gamma=0,subsample=1, max_delta_step=0, colsample_bytree=1,
reg_lambda=1, n_estimators=100, seed=1000, scale_pos_weight=1000)
clf_XG.fit(os_X, os_y,eval_set=[(os_X, os_y), (X_test, y_test)],eval_metric='auc',verbose=False)
evals_result = clf_XG.evals_result()
y_true, y_pred = y_test, clf_XG.predict(X_test)
#F1_score, precision, recall, specifity, G score
print "F1_score : %.4g" % metrics.f1_score(y_true, y_pred)
print "Recall : %.4g" % metrics.recall_score(y_true, y_pred)
recall = metrics.recall_score(y_true, y_pred)
print "Precision : %.4g" % metrics.precision_score(y_true, y_pred)
plt.tight_layout()
plt.ylabel('True label')
plt.xlabel('Predicted label')
#define X y
X, y = data.loc[:, data.columns != 'state'].values, data.loc[:, data.columns ==
'state'].values
X_train, X_test, y_train, y_test = train_test_split(X,
y,
test_size=0.3,
random_state=0)
#ClusterCentroids
cc = ClusterCentroids(random_state=0)
os_X, os_y = cc.fit_sample(X_train, y_train)
#Random Forest
clf_RF = RandomForestClassifier(n_estimators=10,
max_depth=None,
min_samples_split=2,
random_state=0)
clf_RF.fit(os_X, os_y)
y_true, y_pred = y_test, clf_RF.predict(X_test)
#F1_score, precision, recall, specifity, G score
print "F1_score : %.4g" % metrics.f1_score(y_true, y_pred)
print "Recall : %.4g" % metrics.recall_score(y_true, y_pred)
recall = metrics.recall_score(y_true, y_pred)
print "Precision : %.4g" % metrics.precision_score(y_true, y_pred)
from imblearn.under_sampling import ClusterCentroids
import pandas as pd
import numpy as np
benchmark = pd.read_csv("./data/feature_new.csv", sep='\t')
benchmark['label'] = (benchmark['label'] == "acr").astype(int)
X = benchmark[["len", "function", "codon", "dev", "hth"]]
y = benchmark['label']
cc = ClusterCentroids(sampling_strategy={0: 25158}, n_jobs=1, random_state=0)
X_smt, y_smt = cc.fit_sample(X, y)
new_benchmark = pd.concat([y_smt, X_smt], axis=1)
new_benchmark.to_csv("./data/feature_CC.csv", sep="\t", index=False)
def clustercentroidundersample(self, x_train, y_train):
cc = ClusterCentroids()
X_cc, y_cc = cc.fit_sample(x_train, y_train)
return X_cc, y_cc
#Separa los datos que corresponden a las características y a las Etiquetas
dataset = dataframe.values
X = dataset[0:8330, 0:138].astype(float)
Yn = dataset[0:8330:, 138]
Y = np_utils.to_categorical(Yn)
scaler = Normalizer('l2').fit(X)
X_normalized = scaler.transform(X)
#Separar los datos entrenamiento y validación 60-40
#Separar los datos entrenamiento y validación 60-40
X_train, X_test, y_train, y_test = train_test_split(X_normalized,
Yn,
test_size=0.4,
random_state=42)
##balancear datos con SMOTE
sm = SMOTE(random_state=12, ratio=1.0)
X_train1, Y_train1 = sm.fit_sample(X_train, y_train)
##Convertir en vectores binarios y_train y y_test
y_train1 = np_utils.to_categorical(Y_train1)
y_test1 = np_utils.to_categorical(y_test)
#Balancear datos con UNDERSAMPLING
#print(sorted(Counter(y_train).items()))
cc = ClusterCentroids(random_state=0)
X_train2, Y_train2 = cc.fit_sample(X_train, y_train)
#print(sorted(Counter(y_resampled).items())
y_train2 = np_utils.to_categorical(Y_train2)
y_test2 = np_utils.to_categorical(y_test)
adasyn_smote_accuracy_score: 0.3661544972905157
adasyn_f1_score: 0.3661544972905157
adasyn_cohen_kappa_score: 0.04467966548542168
adasyn_hamming_loss 0.6338455027094844
'''
'''
下采样(Under-sampling)
原型生成(prototype generation)
给定数据集S,原型生成算法将生成一个子集S’,其中|S’|<|S|,但是子集并非来自于原始数据集.
意思就是说:原型生成方法将减少数据集的样本数量,剩下的样本是由原始数据集生成的,而不是直接来源于原始数据集.
ClusterCentroids函数实现了上述功能: 每一个类别的样本都会用K-Means算法的中心点来进行合成, 而不是随机从原始样本进行抽取.
'''
from imblearn.under_sampling import ClusterCentroids
cc = ClusterCentroids(random_state=0)
X_resampled_cc, y_resampled_cc = cc.fit_sample(train_set_1_1, label)
print('ClusterCentroids:', sorted(Counter(y_resampled_cc).items()))
x_train_cc, x_test_cc, y_train_cc, y_test_cc = train_test_split(X_resampled_cc,
y_resampled_cc,
random_state=1)
# ClusterCentroids函数提供了一种很高效的方法来减少样本的数量, 但需要注意的是, 该方法要求原始数据集最好能聚类成簇.
# 此外, 中心点的数量应该设置好, 这样下采样的簇能很好地代表原始数据.
svm_clf.fit(x_train_cc, y_train_cc)
joblib.dump(svm_clf, '../model/cc_sample_model.pkl')
#smote评估
from sklearn.model_selection import cross_val_score
scores = cross_val_score(svm_clf, x_test_cc, y_test_cc, cv=5)
print('cc_score:', scores)
pred3 = svm_clf.predict(x_test_cc)
print('cc_accuracy_score:', metrics.accuracy_score(y_test_cc, pred3))
X_tl, y_tl, id_tl = tl.fit_sample(X, y)
print('Removed indexes:', id_tl)
plot_2d_space(X_tl, y_tl, 'Tomek links under-sampling')
from imblearn.under_sampling import ClusterCentroids
cc = ClusterCentroids(ratio={0: 10})
X_cc, y_cc = cc.fit_sample(X, y)
plot_2d_space(X_cc, y_cc, 'Cluster Centroids under-sampling')
from imblearn.over_sampling import SMOTE
smote = SMOTE(ratio='minority')
X_sm, y_sm = smote.fit_sample(X, y)
plot_2d_space(X_sm, y_sm, 'SMOTE over-sampling')
from sklearn.metrics import log_loss
from sklearn.neural_network import MLPClassifier
# import some data to play with
X = []
Y = []
reader = DictReader(open("picture.csv", 'r'))
for row in reader:
Y.append(row['win'])
del row['win']
X.append(row)
v = DictVectorizer(sparse=False)
X = v.fit_transform(X)
print('Original dataset shape {}'.format(Counter(Y)))
#sm = SMOTE(kind='svm')
sm = ClusterCentroids(random_state=42)
X, Y = sm.fit_sample(X, Y)
print('Resampled dataset shape {}'.format(Counter(Y)))
train_x, test_x, train_y, test_y = train_test_split(X, Y, test_size=0.25, random_state=0)
### building the classifiers
clfs = []
svc = SVC(kernel="linear", C=0.025,probability=True)
svc.fit(train_x, train_y)
print('SVC LogLoss {score}'.format(score=log_loss(test_y, svc.predict_proba(test_x))))
clfs.append(svc)
svc = SVC(kernel="linear", C=0.025,probability=True)
svc.fit(train_x, train_y)
print('SVC LogLoss {score}'.format(score=log_loss(test_y, svc.predict_proba(test_x))))
clfs.append(svc)
