def test_bagging_classifier_with_missing_inputs():
# Check that BaggingClassifier can accept X with missing/infinite data
X = np.array([
[1, 3, 5],
[2, None, 6],
[2, np.nan, 6],
[2, np.inf, 6],
[2, np.NINF, 6],
])
y = np.array([3, 6, 6, 6, 6])
classifier = DecisionTreeClassifier()
pipeline = make_pipeline(
FunctionTransformer(replace, validate=False),
classifier
)
pipeline.fit(X, y).predict(X)
bagging_classifier = BaggingClassifier(pipeline)
bagging_classifier.fit(X, y)
y_hat = bagging_classifier.predict(X)
assert_equal(y.shape, y_hat.shape)
bagging_classifier.predict_log_proba(X)
bagging_classifier.predict_proba(X)
# Verify that exceptions can be raised by wrapper classifier
classifier = DecisionTreeClassifier()
pipeline = make_pipeline(classifier)
assert_raises(ValueError, pipeline.fit, X, y)
bagging_classifier = BaggingClassifier(pipeline)
assert_raises(ValueError, bagging_classifier.fit, X, y)
def preprocess(self,any_set,is_train):
if is_train:
dico_pattern={'match_lowercase_only':'\\b[a-z]+\\b',
'match_word':'\\w{2,}',
'match_word1': '(?u)\\b\\w+\\b',
'match_word_punct': '\w+|[,.?!;]',
'match_NNP': '\\b[A-Z][a-z]+\\b|\\b[A-Z]+\\b',
'match_punct': "[,.?!;'-]"
}
tfv_title = TfidfVectorizer(lowercase=True, stop_words='english', token_pattern=dico_pattern["match_word1"],
ngram_range=(1, 2), max_df=1.0, min_df=2, max_features=None,
vocabulary=None, binary=True, norm=u'l2',
use_idf=True, smooth_idf=True, sublinear_tf=True)
tfv_desc = TfidfVectorizer(lowercase=True, stop_words='english', token_pattern=dico_pattern["match_word1"],
ngram_range=(1, 2), max_df=1.0, min_df=2, max_features=None,
vocabulary=None, binary=True, norm=u'l2',
use_idf=True, smooth_idf=True, sublinear_tf=True)
title_pipe = make_pipeline(ColumnSelector(key='title'), tfv_title)
desc_pipe = make_pipeline(ColumnSelector(key='description'), tfv_desc)
self.pipeline = make_union(title_pipe, desc_pipe)
return self.pipeline.fit_transform(any_set)
else:
return self.pipeline.transform(any_set)
def test_pipeline_ducktyping():
pipeline = make_pipeline(Mult(5))
pipeline.predict
pipeline.transform
pipeline.inverse_transform
pipeline = make_pipeline(Transf())
assert_false(hasattr(pipeline, 'predict'))
pipeline.transform
pipeline.inverse_transform
pipeline = make_pipeline(None)
assert_false(hasattr(pipeline, 'predict'))
pipeline.transform
pipeline.inverse_transform
pipeline = make_pipeline(Transf(), NoInvTransf())
assert_false(hasattr(pipeline, 'predict'))
pipeline.transform
assert_false(hasattr(pipeline, 'inverse_transform'))
pipeline = make_pipeline(NoInvTransf(), Transf())
assert_false(hasattr(pipeline, 'predict'))
pipeline.transform
assert_false(hasattr(pipeline, 'inverse_transform'))
def get_pipeline(fsmethods, clfmethod):
"""Returns an instance of a sklearn Pipeline given the parameters
fsmethod1 and fsmethod2 will be joined in a FeatureUnion, then it will joined
in a Pipeline with clfmethod
Parameters
----------
fsmethods: list of estimators
All estimators in a pipeline, must be transformers (i.e. must have a transform method).
clfmethod: classifier
The last estimator may be any type (transformer, classifier, etc.).
Returns
-------
pipe
"""
feat_union = None
if not isinstance(fsmethods, list):
if hasattr(fsmethods, 'transform'):
feat_union = fsmethods
else:
raise ValueError('fsmethods expected to be either a list or a transformer method')
else:
feat_union = make_union(*fsmethods)
if feat_union is None:
pipe = make_pipeline(clfmethod)
else:
pipe = make_pipeline(feat_union, clfmethod)
return pipe
def test_pipeline_ducktyping():
pipeline = make_pipeline(Mult(5))
pipeline.predict
pipeline.transform
pipeline.inverse_transform
pipeline = make_pipeline(Transf())
assert not hasattr(pipeline, 'predict')
pipeline.transform
pipeline.inverse_transform
pipeline = make_pipeline('passthrough')
assert pipeline.steps[0] == ('passthrough', 'passthrough')
assert not hasattr(pipeline, 'predict')
pipeline.transform
pipeline.inverse_transform
pipeline = make_pipeline(Transf(), NoInvTransf())
assert not hasattr(pipeline, 'predict')
pipeline.transform
assert not hasattr(pipeline, 'inverse_transform')
pipeline = make_pipeline(NoInvTransf(), Transf())
assert not hasattr(pipeline, 'predict')
pipeline.transform
assert not hasattr(pipeline, 'inverse_transform')
def __init__(self, **config):
# Validate options are present
for option in _configuration_options:
if option not in config:
raise ValueError("Missing configuration "
"option {!r}".format(option))
# Feature extraction
sparse_features = parse_features(config["sparse_features"])
densifier = make_pipeline(Vectorizer(sparse_features, sparse=True),
ClassifierAsFeature())
dense_features = parse_features(config["dense_features"])
vectorization = make_union(densifier,
Vectorizer(dense_features, sparse=False))
# Classifier
try:
classifier = _valid_classifiers[config["classifier"]]
except KeyError:
raise ValueError("Unknown classification algorithm "
"{!r}".format(config["classifier"]))
classifier = classifier(**config["classifier_args"])
self.pipeline = make_pipeline(vectorization, StandardScaler())
self.classifier = classifier
def analysis(name, typ, condition=None, query=None, title=None):
"""Wrapper to ensure that we attribute the same function for each type
of analyses: e.g. categorical, regression, circular regression."""
# Define univariate analysis
erf_function = None # Default is fast_mannwhitneyu
# /!\ for categorical analyses, the contrast is min(y) - max(y)
# e.g. target_present==False - target_present==True
if typ == 'categorize':
# estimator is normalization + l2 Logistic Regression
clf = make_pipeline(
StandardScaler(),
force_predict(LogisticRegression(class_weight='balanced'), axis=1))
scorer = scorer_auc
chance = .5
elif typ == 'regress':
# estimator is normalization + l2 Ridge
clf = make_pipeline(StandardScaler(), Ridge())
scorer = scorer_spearman
chance = 0.
elif typ == 'circ_regress':
# estimator is normalization + l2 Logistic Regression on cos and sin
clf = make_pipeline(StandardScaler(), PolarRegression(Ridge()))
scorer = scorer_angle
chance = 0.
# The univariate analysis needs a different scorer
erf_function = scorer_circlin
if condition is None:
condition = name
return dict(name=name, condition=condition, query=query, clf=clf,
scorer=scorer, chance=chance, erf_function=erf_function,
cv=8, typ=typ, title=title, single_trial=True)
def main(met_fname, gday_outfname, var):
# Load met data
s = remove_comments_from_header(met_fname)
df_met = pd.read_csv(s, parse_dates=[[0,1]], skiprows=4, index_col=0,
sep=",", keep_date_col=True,
date_parser=date_converter)
# Need to build numpy array, so drop year, doy cols
met_data = df_met.ix[:,2:].values
met_data_train = df_met.ix[0:4000,2:].values
# Load GDAY outputs
df = pd.read_csv(gday_outfname, skiprows=3, sep=",", skipinitialspace=True)
df['date'] = make_data_index(df)
df = df.set_index('date')
target = df[var][0:4000].values
# BUILD MODELS
# hold back 40% of the dataset for testing
#X_train, X_test, Y_train, Y_test = \
# cross_validation.train_test_split(met_data, target, \
# test_size=0.4, random_state=0)
param_KNR = { "n_neighbors": [20], "weights": ['distance'] }
#regmod = DecisionTreeRegressor()
#regmod = RandomForestRegressor()
#regmod = SVR()
regmod = KNeighborsRegressor()
pipeit3 = lambda model: make_pipeline(StandardScaler(), PCA(), model)
pipeit2 = lambda model: make_pipeline(StandardScaler(), model)
regmod_p = pipeit2(regmod)
modlab = regmod_p.steps[-1][0]
par_grid = {'{0}__{1}'.format(modlab, parkey): pardat \
for (parkey, pardat) in param_KNR.iteritems()}
#emulator = GridSearchCV(regmod, param_grid=param_DTR, cv=5)
emulator = GridSearchCV(regmod_p, param_grid=par_grid, cv=5)
#emulator.fit(X_train, Y_train)
emulator.fit(met_data_train, target)
predict = emulator.predict(met_data)
df = pd.DataFrame({'DT': df.index, 'emu': predict, 'gday': df[var]})
plt.plot_date(df.index[4000:4383], df['emu'][4000:4383], 'o',
label='Emulator')
plt.plot_date(df.index[4000:4383], df['gday'][4000:4383], 'o',
label='GDAY')
plt.ylabel('GPP (g C m$^{-2}$ s$^{-1}$)')
plt.legend()
plt.show()
def cross_validation_LR(X,Y, n_folds, C_seq, K_seq, verbose = False):
'''
To classify Y using X, we first use ANOVA to choose K dimensions
in X, where the difference between different Ys are highest, then run
a logistic regression classifier with regularization parameter C on
the K dimensions.
To quantify how well X can classify Y, without specifying training and
testing partition, we do n_folds cross validation.
In each fold, during training, we do an inner loop cross validation to
select C and K that give the best classification accuracy from a given
range; and then we use this to classify the held-out testing data.
Inputs:
X, [n, p], n trials of p dimensional data, used for classification
Y, [n], class labels
n_folds,integer, split the data into n_folds for cross validation
C_seq, a sequence of regularizatioin parameters for logistic
regression classifiers, smaller values specify stronger
regularization.
e.g. C_seq = 10.0** np.arange(-3,1,1)
K_seq, a sequence of integers,
e.g. K_seq = (np.floor(np.arange(0.2,1,0.2)*p)).astype(np.int)
verbose: boolean, if ture, print the best C and K chosen
Output:
averaged classification accuracy of the n_folds
'''
cv0 = StratifiedKFold(Y,n_folds = n_folds)
cv_acc = np.zeros(n_folds)
for i in range(n_folds):
ind_test = cv0.test_folds == i
ind_train = cv0.test_folds != i
tmpX_train = X[ind_train,:]
tmpY_train = Y[ind_train]
tmpX_test = X[ind_test,:]
tmpY_test = Y[ind_test]
# grid search
tmp_cv_score = np.zeros([len(C_seq), len(K_seq)])
for j in range(len(C_seq)):
for k in range(len(K_seq)):
cv1 = StratifiedKFold(tmpY_train,n_folds = n_folds)
anova_filter = SelectKBest(f_regression, k = K_seq[k])
clf = LogisticRegression(C = C_seq[j], penalty = "l2")
anova_clf = make_pipeline(anova_filter, clf)
tmp_cv_score[j,k] = cross_val_score(anova_clf, tmpX_train,
tmpY_train, scoring = "accuracy", cv = cv1).mean()
best_ind = np.argmax(tmp_cv_score.ravel())
best_j, best_k = np.unravel_index(best_ind, tmp_cv_score.shape)
anova_filter = SelectKBest(f_regression, k = K_seq[k])
clf = LogisticRegression(C = C_seq[j], penalty = "l2")
anova_clf = make_pipeline(anova_filter, clf)
tmpY_predict = anova_clf.fit(tmpX_train, tmpY_train).predict(tmpX_test)
if verbose:
print C_seq[best_j],K_seq[best_k]
cv_acc[i] = np.mean(tmpY_test == tmpY_predict)
return np.mean(cv_acc)
def fit(self, X, y):
# Filthy hack
sids = X[:, -1]
all_pipelines = [make_pipeline(LogisticRegressionCV()).fit(X_s, y_s) for
X_s, y_s in subject_splitter(X[:, :-1], y, sids)]
f_union = make_union(*[FeatureUnionWrapper(p) for p in all_pipelines])
self.clf_ = make_pipeline(f_union, LogisticRegressionCV()).fit(X[:, :-1], y)
return self
def test_generator_ok(self):
pipeline = make_pipeline(FakeGenerator(fakes=['job', 'name', 'address'], nb_sample=20, random_state=40))
result = pipeline.fit_transform(None)
self.assertEqual(result.shape, (20, 3))
pipeline = make_pipeline(FakeGenerator(fakes=['job', 'name', 'address'], nb_sample=20, random_state=40))
result_2 = pipeline.fit_transform(None)
# Testing the seed
assert_frame_equal(result, result_2)
def test_make_pipeline_memory():
cachedir = mkdtemp()
memory = Memory(cachedir=cachedir)
pipeline = make_pipeline(DummyTransf(), SVC(), memory=memory)
assert_true(pipeline.memory is memory)
pipeline = make_pipeline(DummyTransf(), SVC())
assert_true(pipeline.memory is None)
shutil.rmtree(cachedir)
def test_generator_ok(self):
pipeline = make_pipeline(
TestGenerator(nb_sample=100, random_state=40, num_sample=(1, 3), categ_sample=['green', 'blue']))
result = pipeline.fit_transform(None)
self.assertEqual(result.shape, (100, 2))
self.assertEqual(result['number'].min(), 1)
self.assertEqual(result['number'].max(), 2)
pipeline = make_pipeline(
TestGenerator(nb_sample=100, random_state=40, num_sample=(1, 3), categ_sample=['green', 'blue']))
result_2 = pipeline.fit_transform(None)
# Testing the seed
assert_frame_equal(result, result_2)
def test_classes_property():
iris = load_iris()
X = iris.data
y = iris.target
reg = make_pipeline(SelectKBest(k=1), LinearRegression())
reg.fit(X, y)
assert_raises(AttributeError, getattr, reg, "classes_")
clf = make_pipeline(SelectKBest(k=1), LogisticRegression(random_state=0))
assert_raises(AttributeError, getattr, clf, "classes_")
clf.fit(X, y)
assert_array_equal(clf.classes_, np.unique(y))
def test_make_pipeline():
t1 = Transf()
t2 = Transf()
pipe = make_pipeline(t1, t2)
assert_true(isinstance(pipe, Pipeline))
assert_equal(pipe.steps[0][0], "transf-1")
assert_equal(pipe.steps[1][0], "transf-2")
pipe = make_pipeline(t1, t2, FitParamT())
assert_true(isinstance(pipe, Pipeline))
assert_equal(pipe.steps[0][0], "transf-1")
assert_equal(pipe.steps[1][0], "transf-2")
assert_equal(pipe.steps[2][0], "fitparamt")
def test_make_pipeline_memory():
cachedir = mkdtemp()
if LooseVersion(joblib_version) < LooseVersion('0.12'):
# Deal with change of API in joblib
memory = Memory(cachedir=cachedir, verbose=10)
else:
memory = Memory(location=cachedir, verbose=10)
pipeline = make_pipeline(DummyTransf(), SVC(), memory=memory)
assert_true(pipeline.memory is memory)
pipeline = make_pipeline(DummyTransf(), SVC())
assert_true(pipeline.memory is None)
shutil.rmtree(cachedir)
def __init__(self):
self.clf1 = [make_pipeline(Imputer(),
GradientBoostingRegressor(n_estimators=5000, max_depth=8)) for _ in range(5)]
self.clf2 = [make_pipeline(Imputer(strategy='median'),
ExtraTreesRegressor(n_estimators=5000, criterion='mse', max_depth=8,
min_samples_split=10, min_samples_leaf=1,
min_weight_fraction_leaf=0.0,
max_features='auto', max_leaf_nodes=None, bootstrap=False,
oob_score=False,
n_jobs=1, random_state=42, verbose=0, warm_start=True)) for _ in range(5)]
self.clf3 = [make_pipeline(Imputer(),
svm.LinearSVR()) for _ in range(5)]
self.clf = [linear_model.LinearRegression() for _ in range(5)]
def get_results(dataset):
X_full, y_full = dataset.data, dataset.target
n_samples = X_full.shape[0]
n_features = X_full.shape[1]
# Estimate the score on the entire dataset, with no missing values
estimator = RandomForestRegressor(random_state=0, n_estimators=100)
full_scores = cross_val_score(estimator, X_full, y_full,
scoring='neg_mean_squared_error')
# Add missing values in 75% of the lines
missing_rate = 0.75
n_missing_samples = int(np.floor(n_samples * missing_rate))
missing_samples = np.hstack((np.zeros(n_samples - n_missing_samples,
dtype=np.bool),
np.ones(n_missing_samples,
dtype=np.bool)))
rng.shuffle(missing_samples)
missing_features = rng.randint(0, n_features, n_missing_samples)
# Estimate the score after replacing missing values by 0
X_missing = X_full.copy()
X_missing[np.where(missing_samples)[0], missing_features] = 0
y_missing = y_full.copy()
estimator = RandomForestRegressor(random_state=0, n_estimators=100)
zero_impute_scores = cross_val_score(estimator, X_missing, y_missing,
scoring='neg_mean_squared_error')
# Estimate the score after imputation (mean strategy) of the missing values
X_missing = X_full.copy()
X_missing[np.where(missing_samples)[0], missing_features] = 0
y_missing = y_full.copy()
estimator = make_pipeline(
make_union(SimpleImputer(missing_values=0, strategy="mean"),
MissingIndicator(missing_values=0)),
RandomForestRegressor(random_state=0, n_estimators=100))
mean_impute_scores = cross_val_score(estimator, X_missing, y_missing,
scoring='neg_mean_squared_error')
# Estimate the score after chained imputation of the missing values
estimator = make_pipeline(
make_union(ChainedImputer(missing_values=0, random_state=0),
MissingIndicator(missing_values=0)),
RandomForestRegressor(random_state=0, n_estimators=100))
chained_impute_scores = cross_val_score(estimator, X_missing, y_missing,
scoring='neg_mean_squared_error')
return ((full_scores.mean(), full_scores.std()),
(zero_impute_scores.mean(), zero_impute_scores.std()),
(mean_impute_scores.mean(), mean_impute_scores.std()),
(chained_impute_scores.mean(), chained_impute_scores.std()))
def build_text_extraction(binary, min_df, ngram, stopwords,useTfIdf ):
if useTfIdf:
return make_pipeline(TfidfVectorizer(min_df=min_df,
max_df = 0.8,
sublinear_tf=True,
use_idf=True,
ngram_range=(1,3)), ClassifierOvOAsFeatures())
return make_pipeline(CountVectorizer(binary=binary,
tokenizer=lambda x: x.split(),
min_df=min_df,
ngram_range=(1, ngram),
stop_words=stopwords),
ClassifierOvOAsFeatures())
def out_fold_pred(params, X, y_array, y_ix, reps):
y = y_array[:, y_ix]
# cross validation here
preds = np.zeros((y_array.shape[0]))
clf = make_pipeline(StandardScaler(), LogisticRegression(**params))
for train_ix, test_ix in makeKFold(5, y, reps):
X_train, y_train = X[train_ix, :], y[train_ix]
X_test = X[test_ix, :]
clf = make_pipeline(StandardScaler(), LogisticRegression(**params))
clf.fit(X_train, y_train)
pred = clf.predict_proba(X_test)[:, 1]
preds[test_ix] = pred
return preds
def build_synset_extraction(binary, min_df, ngram, useTfIdf):
if useTfIdf:
return make_pipeline(MapToSynsets(),
TfidfVectorizer(min_df=min_df,
max_df = 0.8,
sublinear_tf=True,
use_idf=True,
ngram_range=(1,3)),
ClassifierOvOAsFeatures())
return make_pipeline(MapToSynsets(),
CountVectorizer(binary=binary,
tokenizer=lambda x: x.split(),
min_df=min_df,
ngram_range=(1, ngram)),
ClassifierOvOAsFeatures())
def check_pipeline_consistency(name, Estimator):
if name in ('CCA', 'LocallyLinearEmbedding', 'KernelPCA') and _is_32bit():
# Those transformers yield non-deterministic output when executed on
# a 32bit Python. The same transformers are stable on 64bit Python.
# FIXME: try to isolate a minimalistic reproduction case only depending
# scipy and/or maybe generate a test dataset that does not
# cause such unstable behaviors.
msg = name + ' is non deterministic on 32bit Python'
raise SkipTest(msg)
# check that make_pipeline(est) gives same score as est
X, y = make_blobs(n_samples=30, centers=[[0, 0, 0], [1, 1, 1]],
random_state=0, n_features=2, cluster_std=0.1)
X -= X.min()
y = multioutput_estimator_convert_y_2d(name, y)
estimator = Estimator()
set_fast_parameters(estimator)
set_random_state(estimator)
pipeline = make_pipeline(estimator)
estimator.fit(X, y)
pipeline.fit(X, y)
funcs = ["score", "fit_transform"]
for func_name in funcs:
func = getattr(estimator, func_name, None)
if func is not None:
func_pipeline = getattr(pipeline, func_name)
result = func(X, y)
result_pipe = func_pipeline(X, y)
assert_array_almost_equal(result, result_pipe)
def test_estimators_samples_deterministic():
# This test is a regression test to check that with a random step
# (e.g. SparseRandomProjection) and a given random state, the results
# generated at fit time can be identically reproduced at a later time using
# data saved in object attributes. Check issue #9524 for full discussion.
iris = load_iris()
X, y = iris.data, iris.target
base_pipeline = make_pipeline(SparseRandomProjection(n_components=2),
LogisticRegression())
clf = BaggingClassifier(base_estimator=base_pipeline,
max_samples=0.5,
random_state=0)
clf.fit(X, y)
pipeline_estimator_coef = clf.estimators_[0].steps[-1][1].coef_.copy()
estimator = clf.estimators_[0]
estimator_sample = clf.estimators_samples_[0]
estimator_feature = clf.estimators_features_[0]
X_train = (X[estimator_sample])[:, estimator_feature]
y_train = y[estimator_sample]
estimator.fit(X_train, y_train)
assert_array_equal(estimator.steps[-1][1].coef_, pipeline_estimator_coef)
def scipy_algo(dataset, abstract=False):
doc_proc = dp.DocumentsProcessor(dataset)
tfidf_matrix, f_score_dict = doc_proc.get_data(abstract)
svd = TruncatedSVD(tfidf_matrix.shape[0])
lsa = make_pipeline(svd, Normalizer(copy=False))
#tfidf_matrix = lsa.fit_transform(tfidf_matrix)
print 'starting clustering after lsa: found %s document and %s features' \
% (tfidf_matrix.shape[0], tfidf_matrix.shape[1])
linkage_matrix = hr.average(tfidf_matrix.toarray())
#linkage_matrix = hr.average(tfidf_matrix)
t = hr.to_tree(linkage_matrix, rd=True)
clusters = {}
for node in t[1]:
if not node.is_leaf():
l = []
clusters[node.get_id()] = collect_leaf_nodes(node, l)
f = f_score(clusters, f_score_dict)
print_f_score_dict(f)
avg_f_score = average_f_score(f, tfidf_matrix.shape[0])
print 'average f_score: %s' % avg_f_score
return avg_f_score
def train(param_search=False):
data = load_files(download())
y = [data.target_names[t] for t in data.target]
# The random state on the LR estimator is fixed to the most arbitrary value
# that I could come up with. It is biased toward the middle number keys on
# my keyboard.
clf = make_pipeline(TfidfVectorizer(min_df=2, dtype=float,
sublinear_tf=True,
ngram_range=(1, 2),
strip_accents='unicode'),
LogisticRegression(random_state=623, C=5000))
if param_search:
params = {'tfidf__ngram_range': [(1, 1), (1, 2)],
'lr__C': [1000, 5000, 10000]}
print("Starting parameter search for review sentiment classification")
# We ignore the original folds in the data, preferring a simple 5-fold
# CV instead; this is intended to get a working model, not results for
# publication.
gs = GridSearchCV(clf, params, cv=5, refit=True, n_jobs=-1, verbose=2)
gs.fit(data.data, y)
print("Parameters found:")
pprint(gs.best_params_)
print("Cross-validation accuracy: %.3f" % gs.best_score_)
return gs.best_estimator_
else:
print("Training logistic regression for movie review polarity")
return clf.fit(data.data, y)
def cluster_dandelion_2(dataset, gamma=0.91, filter=False):
#duplicato, mi serve solo per tornare la linkage_matrix
doc_proc = dp.DocumentsProcessor(dataset)
if gamma:
tfidf_matrix, f_score_dict, params = doc_proc.get_data_with_dandelion(
gamma=gamma, filter=filter)
else:
tfidf_matrix, f_score_dict, params = doc_proc.get_data_with_dandelion()
svd = TruncatedSVD(tfidf_matrix.shape[0])
lsa = make_pipeline(svd, Normalizer(copy=False))
tfidf_matrix = lsa.fit_transform(tfidf_matrix)
#linkage_matrix = hr.average(tfidf_matrix.toarray())
linkage_matrix = hr.average(tfidf_matrix)
t = hr.to_tree(linkage_matrix, rd=True)
clusters = {}
for node in t[1]:
if not node.is_leaf():
l = []
clusters[node.get_id()] = collect_leaf_nodes(node, l)
f = f_score(clusters, f_score_dict)
l = print_f_score_dict(f)
params['avg_f_score'] = average_f_score(f, tfidf_matrix.shape[0])
params['all_fscore'] = l
return linkage_matrix
def test_bagging_with_pipeline():
estimator = BaggingClassifier(make_pipeline(SelectKBest(k=1),
DecisionTreeClassifier()),
max_features=2)
estimator.fit(iris.data, iris.target)
assert_true(isinstance(estimator[0].steps[-1][1].random_state,
int))
def main():
if os.path.exists(args.out_svd_result_matrix):
print("Loading SVD matrix from file")
X = np.load(args.out_svd_result_matrix)
print("Loading corpus")
_, file_index = LoadCorpus(args.training_dir)
else:
print("Loading corpus")
corpus, file_index = LoadCorpus(args.training_dir)
print("Building TF-IDF")
tf_idf = TfidfVectorizer(input="content", lowercase=False)
X = tf_idf.fit_transform(corpus)
del corpus
print("Running LSA")
svd = TruncatedSVD(args.dimentionality)
normalizer = Normalizer(copy=False)
lsa = make_pipeline(svd, normalizer)
X = lsa.fit_transform(X)
print("Saving SVD results")
np.save(args.out_svd_result_matrix, X)
if (
os.path.exists(args.out_inv_idx)
and os.path.exists(args.out_unique_kmeans_labels)
and os.path.exists(args.out_idx)
):
print("Loading labels")
unique_labels = np.load(args.out_unique_kmeans_labels)
inv_idx = np.load(args.out_inv_idx)
idx = np.load(args.out_idx)
unique_X = X[idx]
else:
print("Unique matrix")
b = np.ascontiguousarray(X).view(np.dtype((np.void, X.dtype.itemsize * X.shape[1])))
_, idx, inv_idx = np.unique(b, return_index=True, return_inverse=True)
print("Saving inv_idx")
np.save(args.out_inv_idx, inv_idx)
print("Saving idx")
np.save(args.out_idx, idx)
unique_X = X[idx]
print("Running K-Means")
unique_labels, _ = KMeans(unique_X)
print("Save unique K-Means labels")
np.save(args.out_unique_kmeans_labels, unique_labels)
print("Re-label non-unique")
labels = unique_labels[inv_idx]
for l in range(unique_labels.max() + 1):
out_filename = args.out_unique_distance_matrix_prefix + str(l) + ".npy"
if os.path.exists(out_filename):
continue
print("Calculating distance matrix for label:", l)
D = CalcDistances(unique_labels, l, unique_X)
print("Saving to distance matrix to file")
np.save(out_filename, D)
if not os.path.exists(args.out_corpus_index):
print("Calculating corpus index")
corpus_index = GetCorpusIndex(file_index, labels, unique_labels, inv_idx)
print("Saving corpus index")
json.dump(corpus_index, open(args.out_corpus_index, "w"))
def get_input_vector(fields, vec_name, data):
"""Transform the input and create a 2D vector to cluster."""
transformer = create_input_transformer(fields, vec_name)
pipeline = make_pipeline(transformer, TruncatedSVD())
log_info('Transformation pipeline complete.')
return pipeline.fit_transform(data)
def build_lex_extraction(binary, min_df, ngram):
return make_pipeline(InquirerLexTransform(),
CountVectorizer(binary=binary,
tokenizer=lambda x: x.split(),
min_df=min_df,
ngram_range=(1, ngram)),
Densifier())
# Finally We want to find Data Series of late X and early X (train) for model generation and evaluation X_lately = X[-forecast_out:] X_train = X[:-forecast_out] # Separate label and identify it as y y = np.array(dfreg['label']) y_train = y[:-forecast_out] #Model Generation # Linear regression clfreg = LinearRegression(n_jobs=-1) clfreg.fit(X_train, y_train) # Quadratic Regression 2 clfpoly2 = make_pipeline(PolynomialFeatures(2), Ridge()) clfpoly2.fit(X_train, y_train) # Quadratic Regression 3 clfpoly3 = make_pipeline(PolynomialFeatures(3), Ridge()) clfpoly3.fit(X_train, y_train) # KNN Regression clfknn = KNeighborsRegressor(n_neighbors=2) clfknn.fit(X_train, y_train) #Evaluation #confidencereg = clfreg.score(X_test, y_test) #confidencepoly2 = clfpoly2.score(X_test,y_test) #confidencepoly3 = clfpoly3.score(X_test,y_test) #confidenceknn = clfknn.score(X_test, y_test)
def create_pipeline(search_space):
pipeline = make_pipeline(
SimpleImputer(**search_space['simpleimputer']),
LogisticRegression(solver='liblinear',
**search_space['logisticregression']))
return pipeline
# epochs = epochs.apply_baseline(baseline=(-0.2, 0))
######################
# MVPA
# Init Cross-validation instance
logo = LeaveOneGroupOut()
# Init Xdawn, classifier and time_decoder
xdawn = mne.preprocessing.Xdawn(n_components=6, reg='diagonal_fixed')
# Init classifier
class_weight = 'balanced' # None or 'balanced'
lr = LogisticRegression(solver='lbfgs', class_weight=class_weight)
svm = svm.SVC(gamma='scale', kernel='rbf', class_weight=class_weight)
# Init decoder
clf = make_pipeline(StandardScaler(), svm)
# Raw 3-D data decoder
raw_decoder = make_pipeline(mne.decoding.Vectorizer(), StandardScaler(), clf)
# Time resolution data decoder
time_decoder = SlidingEstimator(clf, n_jobs=n_jobs, scoring='f1', verbose=1)
# Init time information
times = epochs.times
n_times = len(times)
y_true = epochs.events[:, 2]
n_samples = len(y_true)
# Time window information
sfreq = epochs.info['sfreq']
window_info = {}
y_pred_timewindow = {}
for window_length in [0.1, 0.2, 0.3, 0.4]:
def test_in_pipeline():
from sklearn.pipeline import make_pipeline
X, y = make_classification(n_samples=100, n_features=5, chunksize=10)
pipe = make_pipeline(DoNothingTransformer(), LogisticRegression())
pipe.fit(X, y)
def train_classifier(input_features, test_features, classifier_type,
classifier_output, feat_names):
feats = []
labels = []
# Load features and labels and format them as numpy array
for line in input_features:
parts = line.rstrip("\n").split("\t")
feats.append([float(v) for v in parts[:-1]])
labels.append(int(parts[-1]))
dataset = dict()
dataset['data'] = np.array(feats)
dataset['target'] = np.array(labels)
# Train classifier
if classifier_type == "svm":
clf = make_pipeline(MinMaxScaler(),
svm.SVC(gamma=0.001, C=100., probability=True))
elif classifier_type == "mlp":
clf = MLPClassifier(verbose=True,
solver='adam',
alpha=1e-5,
hidden_layer_sizes=(100, ),
random_state=1,
shuffle=True,
early_stopping=True,
validation_fraction=0.1)
elif classifier_type == "extra_trees":
parameters = {
'criterion': ('gini', 'entropy'),
'n_estimators': [100, 200, 300, 400, 500],
}
clf = ExtraTreesClassifier(bootstrap=True,
class_weight=None,
criterion='gini',
max_depth=None,
max_features='auto',
max_leaf_nodes=None,
min_impurity_decrease=0.0,
min_impurity_split=None,
min_samples_leaf=1,
min_samples_split=2,
min_weight_fraction_leaf=0.0,
n_estimators=200,
n_jobs=1,
oob_score=False,
random_state=0,
verbose=0,
warm_start=False)
elif classifier_type == "nn":
clf = neighbors.KNeighborsClassifier(n_neighbors=5, n_jobs=-1)
elif classifier_type == "nn1":
clf = neighbors.KNeighborsClassifier(n_neighbors=1, n_jobs=-1)
elif classifier_type == "adaboost":
clf = AdaBoostClassifier(n_estimators=100)
elif classifier_type == "random_forest":
parameters = {
'criterion': ('gini', 'entropy'),
'n_estimators': [100, 200, 300, 400, 500],
}
clf = RandomForestClassifier(bootstrap=True,
class_weight=None,
criterion='gini',
max_depth=None,
max_features='auto',
max_leaf_nodes=None,
min_impurity_decrease=0.0,
min_impurity_split=None,
min_samples_leaf=1,
min_samples_split=2,
min_weight_fraction_leaf=0.0,
n_estimators=200,
n_jobs=1,
oob_score=False,
random_state=0,
verbose=0,
warm_start=False)
else:
logging.error("Unknown classifier: " + classifier_type)
sys.exit(1)
# If parameters is defined perform grid search
try:
parameters
except NameError:
pass
else:
clf = GridSearchCV(clf, parameters, n_jobs=-1)
clf.fit(dataset['data'], dataset['target'])
# Log sorted feature importances with their names
if classifier_type in ('random_forest', 'adaboost', 'extra_trees'):
if isinstance(clf, GridSearchCV):
feat_dict = dict(
zip(feat_names, clf.best_estimator_.feature_importances_))
else:
feat_dict = dict(zip(feat_names, clf.feature_importances_))
logging.info("Top 10 important features: ")
sorted_f = sorted(feat_dict.items(),
key=lambda item: item[1],
reverse=True)
for feat in sorted_f[:10]:
logging.info("\t{:.5f}: {}".format(feat[1], feat[0]))
# Save classifier and log best params found by grid search
if isinstance(clf, GridSearchCV):
joblib.dump(clf.best_estimator_, classifier_output, compress=3)
logging.info('Best classifier parameters found:')
for k, v in clf.best_params_.items():
logging.info('\t {}: {}'.format(k, v))
else:
joblib.dump(clf, classifier_output, compress=3)
feats = []
labels = []
for line in test_features:
parts = line.rstrip("\n").split("\t")
feats.append([float(v) for v in parts[:-1]])
labels.append(int(parts[-1]))
dataset = np.array(feats)
prediction = clf.predict_proba(dataset)
pos = 0
good = []
wrong = []
for pred in prediction:
if labels[pos] == 1:
good.append(pred[1])
else:
wrong.append(pred[1])
pos += 1
hgood = np.histogram(good, bins=np.arange(0, 1.1, 0.1))
hwrong = np.histogram(wrong, bins=np.arange(0, 1.1, 0.1))
return hgood[0].tolist(), hwrong[0].tolist()
print 'Accuracy = %s' % (float(equal)/len(Y_pred))
# Loading the dataset
dataset_url = 'http://mlr.cs.umass.edu/ml/machine-learning-databases/wine-quality/winequality-red.csv'
data = pd.read_csv(dataset_url, sep=';')
# Splitting into training and testing datasets
Y = data.quality
X = data.drop('quality', axis=1)
X_train, X_test, Y_train, Y_test = model_selection.train_test_split(
X, Y, test_size=0.25, random_state=123, stratify=Y)
# Preprocessing the Data
pipeline = make_pipeline(preprocessing.StandardScaler(),
RandomForestClassifier(n_estimators=500, criterion='entropy'))
# Setting the HyperParameters
hyperparameters = {'randomforestclassifier__max_features': [
'auto', 'sqrt', 'log2'], 'randomforestclassifier__max_depth': [None, 5, 3, 1, 7]}
# Fitting the classfier
clf = GridSearchCV(pipeline, hyperparameters, cv=5)
clf.fit(X_train, Y_train)
# Making prediction on the test set
Y_pred = clf.predict(X_test)
# Calculating Accuracy
accuracy(Y_test.tolist(), Y_pred)
from sklearn.linear_model import LogisticRegression
import mglearn
import matplotlib.pyplot as plt
from sklearn.model_selection import GridSearchCV
from sklearn.pipeline import make_pipeline
data = pd.read_excel("Data/Data_TrainProcessed.xlsx",
error_bad_lines=False,
encoding='utf-8')
y_score = (data['Rate'].values).reshape(-1, 1)
binaray = Binarizer(threshold=3)
y = binaray.fit_transform(y_score)
y_train = np.array(y).flatten()
pipe = make_pipeline(
TfidfVectorizer(min_df=5, max_df=0.8, max_features=3000,
sublinear_tf=True), LogisticRegression())
param_grid = {'logisticregression__C': [0.001, 0.01, 0.1, 1, 10]}
grid = GridSearchCV(pipe, param_grid, cv=5)
grid.fit(data['Review'].values.astype('U'), y_train)
vectorizer = grid.best_estimator_.named_steps["tfidfvectorizer"]
# transform the training dataset
X_train = vectorizer.transform(data['Review'].values.astype('U'))
# find maximum value for each of the features over the dataset
max_value = X_train.max(axis=0).toarray().ravel()
sorted_by_tfidf = max_value.argsort()
# get feature names
feature_names = np.array(vectorizer.get_feature_names())
mglearn.tools.visualize_coefficients(
grid.best_estimator_.named_steps["logisticregression"].coef_,
feature_names,
X_array = np.asarray(X)
X_array = np.asarray(X)
is_all_zero = np.all(X_array == 0)
if is_all_zero:
print('array is all zeros')
else:
print('Array is good')
choice_length = np.count_nonzero(~np.isnan(labels))
X, y = shuffle(X_array, labels)
X = X[:choice_length]
y = y[:choice_length].fillna(0)
scaler = MinMaxScaler(feature_range=(-1, 1))
mm = make_pipeline(MinMaxScaler(), Normalizer())
X = mm.fit_transform(X)
rbf_feature = RBFSampler(gamma=1.5, random_state=10)
ps = PolynomialCountSketch(degree=11, random_state=1)
X_rbf_features = rbf_feature.fit_transform(X)
X_poly_features = ps.fit_transform(X)
# We want to get TSNE embedding with 2 dimensions
n_components = 3
tsne = TSNE(n_components)
tsne_result = tsne.fit_transform(X_rbf_features)
locationFileName = os.path.join(
figuresDestination,
str(sorted(symbols)[symbolIdx]) + '_idx_' + str(idx) +
'date_' + str(dateIdx) + '_' + str(labelName) +
'_tsne_rbf_kernelised.png')
from sklearn.preprocessing import StandardScaler
from sklearn.decomposition import PCA
from sklearn.pipeline import make_pipeline
from sklearn import metrics
import os
train_prefix = "temp/final/train_5/"
test_prefix = "temp/final/test/"
input = []
label = []
for file in os.listdir(train_prefix):
data = open(train_prefix + file,"r")
data_read = csv.reader(data)
for lines in data_read:
input.append([float(elem) for elem in lines[0:-1]])
label.append(float(lines[-1]))
X = np.array(input)
Y = np.array(label)
h = .02 # step size in the mesh
X_train, X_test, y_train, y_test = train_test_split(X, Y,
test_size=0.2)
std_clf = make_pipeline(StandardScaler(), linear_model.LogisticRegression(C=1e5))
std_clf.fit(X_train, y_train)
pred_test_std = std_clf.predict(X_test)
print('{:.2%}\n'.format(metrics.accuracy_score(y_test, pred_test_std)))
data_cfg, **repr_cfg[utils_section])
# change y in case of classification
if 'classification' == task_cfg[utils_section]['task']:
log_scale = True if 'log' == data_cfg[csv_section]['scale'].lower().strip(
) else False
y = task_cfg[utils_section]['cutoffs'](y, log_scale)
test_y = task_cfg[utils_section]['cutoffs'](test_y, log_scale)
training_features = x
training_target = y
testing_features = test_x
# Average CV score on the training set was: 0.8734423037820145
exported_pipeline = make_pipeline(
Binarizer(threshold=0.15000000000000002),
ExtraTreesClassifier(bootstrap=False,
criterion="entropy",
max_depth=20,
max_features=0.15000000000000002,
max_samples=None,
min_samples_leaf=2,
min_samples_split=7,
n_estimators=500))
# Fix random state for all the steps in exported pipeline
set_param_recursive(exported_pipeline.steps, 'random_state', 666)
exported_pipeline.fit(training_features, training_target)
results = exported_pipeline.predict(testing_features)
print('Success.')
def calculate_score(deg, X, y):
pipe = make_pipeline(StandardScaler(), PolynomialFeatures(deg),
BayesianRidge(normalize=False)) # type: Pipeline
pipe.fit(X, y)
return pipe.score(X, y)
#Validation function
n_folds = 5
def rmsle_cv(model):
kf = KFold(
n_folds, shuffle=True, random_state=42).get_n_splits(train.values)
rmse = np.sqrt(-cross_val_score(
model, train.values, y_train, scoring="neg_mean_squared_error", cv=kf))
print("rmse", rmse)
return (rmse)
# 模型
# LASSO Regression :
lasso = make_pipeline(RobustScaler(), Lasso(alpha=0.0005, random_state=1))
# Elastic Net Regression
ENet = make_pipeline(
RobustScaler(), ElasticNet(
alpha=0.0005, l1_ratio=.9, random_state=3))
# Kernel Ridge Regression
KRR = KernelRidge(alpha=0.6, kernel='polynomial', degree=2, coef0=2.5)
# Gradient Boosting Regression
GBoost = GradientBoostingRegressor(
n_estimators=3000,
learning_rate=0.05,
max_depth=4,
max_features='sqrt',
min_samples_leaf=15,
min_samples_split=10,
loss='huber',
test = rated_df.loc[~rated_df.index.isin(train.index)]
print("Train rows: {}".format(len(train.index)))
print("Test rows: {}".format(len(test.index)))
# In[# Train Model with Data
from sklearn.preprocessing import StandardScaler
from sklearn.model_selection import LeaveOneOut
from sklearn.neural_network import MLPClassifier
from sklearn.model_selection import GridSearchCV
from sklearn.pipeline import make_pipeline
sc = StandardScaler()
mlc = MLPClassifier(activation='relu', random_state=1, nesterovs_momentum=True)
loo = LeaveOneOut()
pipe = make_pipeline(sc, mlc)
# Train the Model and check wich of the Parameters works best
parameters = {
"mlpclassifier__hidden_layer_sizes": [(300, ), (500, )],
"mlpclassifier__solver": ("sgd", "lbfgs"),
"mlpclassifier__max_iter": [500, 1000, 2000],
"mlpclassifier__learning_rate_init": [0.001, 0.1]
}
MLPClassifierModel = GridSearchCV(pipe, parameters, n_jobs=-1, cv=5)
MLPClassifierModel.fit(train[features], train[target])
# Save Model to file to used it later
file = open("test3_k_t_o_MLPClassifierModel_10_comp.pkl", 'wb')
pickle.dump(MLPClassifierModel, file)
file.close()
# %%
# Scikit-learn provides an estimator called
# :class:`~sklearn.linear_model.LinearLarsIC` that uses either Akaike's
# information criterion (AIC) or the Bayesian information criterion (BIC) to
# select the best model. Before fitting
# this model, we will scale the dataset.
#
# In the following, we are going to fit two models to compare the values
# reported by AIC and BIC.
from sklearn.preprocessing import StandardScaler
from sklearn.linear_model import LassoLarsIC
from sklearn.pipeline import make_pipeline
lasso_lars_ic = make_pipeline(StandardScaler(),
LassoLarsIC(criterion="aic",
normalize=False)).fit(X, y)
# %%
# To be in line with the defintion in [ZHT2007]_, we need to rescale the
# AIC and the BIC. Indeed, Zou et al. are ignoring some constant terms
# compared to the original definition of AIC derived from the maximum
# log-likelihood of a linear model. You can refer to
# :ref:`mathematical detail section for the User Guide <lasso_lars_ic>`.
def zou_et_al_criterion_rescaling(criterion, n_samples, noise_variance):
"""Rescale the information criterion to follow the definition of Zou et al."""
return criterion - n_samples * np.log(
2 * np.pi * noise_variance) - n_samples
data_path = os.path.join(os.path.expanduser('~'), 'kaggle/Caterpillar/data')
dataset = 'br6lin'
train = pd.read_csv(os.path.join(stage1, dataset, 'training.csv'))
target = train.cost
train.drop(['cost'], axis=1, inplace=True)
tube_assembly_ids = pd.read_csv(os.path.join(data_path, 'train_set.csv'), usecols=['tube_assembly_id'])
train['tube_assembly_id'] = tube_assembly_ids
test = pd.read_csv(os.path.join(stage1, dataset, 'testing.csv'))
test.drop(['cost'], axis=1, inplace=True)
preprocess = make_pipeline(
ScaleContinuousOnly(),
# StandardScaler(),
)
cwd = os.getcwd()
refit_train_val_dir = 'refit_train_val'
refit_train_dir = 'refit_train'
#epoch_save_range = range(30, 101, 5)
epoch_save_range = list(range(10, 11, 5))
t0 = time.time()
n_folds = 3
do_folds = 3
def KLabelFold(labels, n_folds=3, shuffle=False, random_state=None):
kfold = KFold(labels.nunique(), n_folds=n_folds, shuffle=shuffle, random_state=random_state)
y -= y.mean()
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.1,
random_state=0)
##############################################################################
# Partial Dependence computation for multi-layer perceptron
# ---------------------------------------------------------
#
# Let's fit a MLPRegressor and compute single-variable partial dependence
# plots
print("Training MLPRegressor...")
tic = time()
est = make_pipeline(QuantileTransformer(),
MLPRegressor(hidden_layer_sizes=(50, 50),
learning_rate_init=0.01,
early_stopping=True))
est.fit(X_train, y_train)
print("done in {:.3f}s".format(time() - tic))
print("Test R2 score: {:.2f}".format(est.score(X_test, y_test)))
##############################################################################
# We configured a pipeline to scale the numerical input features and tuned the
# neural network size and learning rate to get a reasonable compromise between
# training time and predictive performance on a test set.
#
# Importantly, this tabular dataset has very different dynamic ranges for its
# features. Neural networks tend to be very sensitive to features with varying
# scales and forgetting to preprocess the numeric feature would lead to a very
# poor model.
#
"classifier__solver":['newton-cg','saga','sag','liblinear'] ##This solvers don't allow L1 penalty
},
{"classifier": [RandomForestClassifier()],
"classifier__n_estimators": [10, 100, 1000],
"classifier__max_depth":[5,8,15,25,30,None],
"classifier__min_samples_leaf":[1,2,5,10,15,100],
"classifier__max_leaf_nodes": [2, 5,10]}]
# create a gridsearch of the pipeline, the fit the best model
gridsearch = GridSearchCV(pipe, grid_param, cv=5, verbose=0,n_jobs=-1) # Fit grid search
best_model = gridsearch.fit(X_train,y_train)
print(best_model.best_estimator_)
print("The mean accuracy of the model is:",best_model.score(X_test,y_test))
#MakePipelines In SKLearn
from sklearn.pipeline import make_pipeline
# Create a pipeline
pipe = make_pipeline((RandomForestClassifier()))
# Create dictionary with candidate learning algorithms and their hyperparameters
grid_param = [
{"randomforestclassifier": [RandomForestClassifier()],
"randomforestclassifier__n_estimators": [10, 100, 1000],
"randomforestclassifier__max_depth":[5,8,15,25,30,None],
"randomforestclassifier__min_samples_leaf":[1,2,5,10,15,100],
"randomforestclassifier__max_leaf_nodes": [2, 5,10]}]
# create a gridsearch of the pipeline, the fit the best model
gridsearch = GridSearchCV(pipe, grid_param, cv=5, verbose=0,n_jobs=-1) # Fit grid search
best_model = gridsearch.fit(X_train,y_train)
best_model.score(X_test,y_test)
print("%d sentences" % len(dataset.data))
print("%d categories" % len(dataset.target_names))
print()
print(
"Extracting features from the training dataset using a sparse vectorizer")
t0 = time()
if opts.use_hashing:
if opts.use_idf:
# Perform an IDF normalization on the output of HashingVectorizer
hasher = HashingVectorizer(n_features=opts.n_features,
stop_words='english',
alternate_sign=False,
norm=None,
binary=False)
vectorizer = make_pipeline(hasher, TfidfTransformer(norm=opts.norm))
else:
vectorizer = HashingVectorizer(n_features=opts.n_features,
stop_words='english',
alternate_sign=False,
norm=opts.norm,
binary=False)
else:
vectorizer = TfidfVectorizer(max_df=0.5,
max_features=opts.n_features,
min_df=2,
stop_words='english',
use_idf=opts.use_idf,
norm=opts.norm)
X = vectorizer.fit_transform(dataset.data)
# commented out after the run
#pipeline_optimizer.fit(train, train_labels)
# export optimized code
# commented out after the run
#pipeline_optimizer.export('tpot_titanic_pipeline.py')
# import libraries
from sklearn.pipeline import make_pipeline
# create the pipeline from TPOT
# original pipeline inluded a Binarizer and RBFSampler which scored only 0.78947
exported_pipeline = make_pipeline(
RandomForestClassifier(bootstrap=False,
criterion="gini",
max_features=0.45,
min_samples_leaf=14,
min_samples_split=13,
n_estimators=100))
# fit the pipeline on the train data
exported_pipeline.fit(train, train_labels)
# predict on the test data
results = exported_pipeline.predict(test)
# In[ ]:
# make a submission dataframe
submit = df_test.loc[:, ['PassengerId']]
submit.loc[:, 'Survived'] = results
km.labels_,
sample_size=1000,
random_state=random_state)
logger.debug("Silhouette Coefficient: %0.3f" %
silhouette_score)
logger.debug("Homogeneity: %0.3f" % homogeneity)
text_to_display = 'homogeneity: %.2f\nsilhouette: %.2f' % (
homogeneity, silhouette_score)
elif do_lsa:
topic_model_name = 'LSA'
n_components = 300
n_components = min(100, tfidf.shape[1] - 1)
svd = TruncatedSVD(n_components, random_state=random_state)
normalizer = Normalizer(copy=False)
lsa = make_pipeline(svd, normalizer)
lsa_results = lsa.fit_transform(tfidf)
explained_variance = svd.explained_variance_ratio_.sum()
logger.debug('Explained variance of the SVD step: %d' %
int(explained_variance * 100))
true_k = tfidf.shape[0] * tfidf.shape[1] / tfidf.nnz
logger.debug('we are looking for %d clusters' % true_k)
verbose = False
if minibatch:
km = MiniBatchKMeans(n_clusters=true_k,
init='k-means++',
n_init=1,
init_size=1000,
# 3. Load red wine data.
dataset_url = 'http://mlr.cs.umass.edu/ml/machine-learning-databases/wine-quality/winequality-red.csv'
data = pd.read_csv(dataset_url, sep=';')
# 4. Split data into training and test sets
y = data.quality
X = data.drop('quality', axis=1)
X_train, X_test, y_train, y_test = train_test_split(X,
y,
test_size=0.2,
random_state=123,
stratify=y)
# 5. Declare data preprocessing steps
pipeline = make_pipeline(preprocessing.StandardScaler(),
RandomForestRegressor(n_estimators=100))
# 6. Declare hyperparameters to tune
hyperparameters = {
'randomforestregressor__max_features': ['auto', 'sqrt', 'log2'],
'randomforestregressor__max_depth': [None, 5, 3, 1]
}
# 7. Tune model using cross-validation pipeline
clf = GridSearchCV(pipeline, hyperparameters, cv=10)
clf.fit(X_train, y_train)
# 8. Refit on the entire training set
# No additional code needed if clf.refit == True (default is True)
# or indices provided. We will obtain as many subsets as the number of # transformers passed into the `ColumnTransformer`. # * It **transforms each subsets**. A specific transformer is applied to # each subset: it will internally call `fit_transform` or `transform`. The # output of this step is a set of transformed datasets. # * It then **concatenate the transformed datasets** into a single dataset. # The important thing is that `ColumnTransformer` is like any other # scikit-learn transformer. In particular it can be combined with a classifier # in a `Pipeline`: # %% from sklearn.linear_model import LogisticRegression from sklearn.pipeline import make_pipeline model = make_pipeline(preprocessor, LogisticRegression(max_iter=500)) # %% [markdown] # Starting from `scikit-learn 0.23`, the notebooks can display an interactive # view of the pipelines. # %% from sklearn import set_config set_config(display='diagram') model # %% [markdown] # The final model is more complex than the previous models but still follows # the same API (the same set of methods that can be called by the user): # # - the `fit` method is called to preprocess the data and then train the
def PolynomialLasso(degree=1, alpha=1):
return make_pipeline(PolynomialFeatures(degree = degree,\
include_bias = False), StandardScaler(), Lasso(alpha = alpha))
def PolynomialRegression(degree=1):
return make_pipeline(PolynomialFeatures(degree = degree,\
include_bias = False), LinearRegression())
# Create separate object for target variable
y = df.<feature>
# Create separate object for input features
X = df.drop('<target feature>', axis = 1)
#Use to split data into train and test data
train_test_split
# Function for creating model pipelines
from sklearn.pipeline import make_pipeline
# For standardization
from sklearn.preprocessing import StandardScaler
#Good practice: create dictionary holding different algos
pipelines = {
'lasso': make_pipeline(StandardScaler(), lasso()),
...
}
#Do same thing for hyperparameters grid; one per algo
lasso_hyperparameters = {
'lasso__alpha' : [0.001, 0.005, 0.01, 0.05, 0.1, 0.5, 1, 5, 10]
}
# Create hyperparameters dictionary
hyperparameters = {
'lasso': lasso_hyperparameters,
...
}
# List tuneable hyperparameters of our Lasso pipeline
labels = epochs.events[:, -1]
evoked = epochs.average()
###############################################################################
# Decoding in tangent space with a logistic regression
n_components = 2 # pick some components
# Define a monte-carlo cross-validation generator (reduce variance):
cv = KFold(n_splits=10, shuffle=True, random_state=42)
epochs_data = epochs.get_data()
clf = make_pipeline(
XdawnCovariances(n_components),
TangentSpace(metric="riemann"),
LogisticRegression(),
)
preds = np.zeros(len(labels))
for train_idx, test_idx in cv.split(epochs_data):
y_train, y_test = labels[train_idx], labels[test_idx]
clf.fit(epochs_data[train_idx], y_train)
preds[test_idx] = clf.predict(epochs_data[test_idx])
# Printing the results
acc = np.mean(preds == labels)
print("Classification accuracy: %f " % (acc))
import numpy as np
import pandas as pd
from sklearn.ensemble import RandomForestClassifier
from sklearn.model_selection import train_test_split
from sklearn.neighbors import KNeighborsClassifier
from sklearn.pipeline import make_pipeline, make_union
from sklearn.preprocessing import Normalizer
from tpot.builtins import StackingEstimator
# NOTE: Make sure that the class is labeled 'target' in the data file
tpot_data = pd.read_csv('PATH/TO/DATA/FILE',
sep='COLUMN_SEPARATOR',
dtype=np.float64)
features = tpot_data.drop('target', axis=1).values
training_features, testing_features, training_target, testing_target = \
train_test_split(features, tpot_data['target'].values, random_state=42)
# Score on the training set was:0.032380308137753055
exported_pipeline = make_pipeline(
StackingEstimator(estimator=RandomForestClassifier(bootstrap=False,
criterion="gini",
max_features=0.55,
min_samples_leaf=2,
min_samples_split=4,
n_estimators=100)),
Normalizer(norm="l1"),
KNeighborsClassifier(n_neighbors=45, p=1, weights="uniform"))
exported_pipeline.fit(training_features, training_target)
results = exported_pipeline.predict(testing_features)
def test_bagging_with_pipeline():
estimator = BaggingClassifier(make_pipeline(SelectKBest(k=1),
DecisionTreeClassifier()),
max_features=2)
estimator.fit(iris.data, iris.target)
rf = RandomForestClassifier(n_estimators=400,
verbose=100,
n_jobs=-1,
random_state=0,
max_samples=5000)
rf.fit(X_train_rf, y_train)
feature_selector = SelectFromModel(rf, prefit=True, max_features=100000)
svc_set = pd.concat([X_train, y_train], axis=1)
svc_set = svc_set.sample(100000, random_state=0)
svc_X = svc_set['review']
svc_y = svc_set['label']
svc_X = vectorizer.transform(svc_X)
svc_X = feature_selector.transform(svc_X)
svc = SVC(cache_size=1000, random_state=0)
svc.fit(svc_X, svc_y)
final_pipe = make_pipeline(vectorizer, feature_selector, svc)
# 95.92% accuracy
final_pipe.score(X_test, y_test)
dump(final_pipe, 'trained_models/good_svc_pruned')
df = pd.read_csv('https://archive.ics.uci.edu/ml/'
'machine-learning-databases'
'/breast-cancer-wisconsin/wdbc.data', header=None)
X = df.loc[:, 2:].values
y = df.loc[:, 1].values
le = LabelEncoder()
y = le.fit_transform(y)
le.classes_
le.transform(['M', 'B'])
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.20, stratify=y, random_state=1)
pipe_lr = make_pipeline(StandardScaler(),
LogisticRegression(solver='liblinear',
penalty='l2',
random_state=1))
train_sizes, train_scores, test_scores = learning_curve(estimator=pipe_lr,
X=X_train,
y=y_train,
train_sizes=np.linspace(0.1, 1.0, 10),
cv=10,
n_jobs=1)
train_mean = np.mean(train_scores, axis=1)
train_std = np.std(train_scores, axis=1)
test_mean = np.mean(test_scores, axis=1)
test_std = np.std(test_scores, axis=1)
plt.plot(train_sizes, train_mean,