def check_folding(classifier, check_instance=True, has_staged_pp=True, has_importances=True):
X, y, sample_weight = generate_classification_data(distance=0.6)
assert classifier == classifier.fit(X, y, sample_weight=sample_weight)
assert list(classifier.features) == list(X.columns)
check_classification_model(classifier, X, y, check_instance=check_instance, has_staged_pp=has_staged_pp,
has_importances=has_importances)
def mean_vote(x):
return numpy.mean(x, axis=0)
labels = classifier.predict(X, mean_vote)
proba = classifier.predict_proba(X, mean_vote)
assert numpy.all(proba == classifier.predict_proba(X, mean_vote))
score = accuracy_score(y, labels)
print(score)
assert score > 0.7
assert numpy.allclose(proba.sum(axis=1), 1), 'probabilities do not sum to 1'
assert numpy.all(proba >= 0.), 'negative probabilities'
auc_score = roc_auc_score(y, proba[:, 1])
print(auc_score)
assert auc_score > 0.8
if has_staged_pp:
for p in classifier.staged_predict_proba(X, mean_vote):
assert p.shape == (len(X), 2)
# checking that last iteration coincides with previous
assert numpy.all(p == proba)
def test_quality(n_samples=3000):
testX, testY = generate_sample(n_samples, 10, 0.6)
trainX, trainY = generate_sample(n_samples, 10, 0.6)
params = {
'n_neighbors': 10,
'n_estimators': 10,
'uniform_variables': ['column0'],
'base_estimator':
DecisionTreeClassifier(min_samples_leaf=20, max_depth=5)
}
for algorithm in ['SAMME', 'SAMME.R']:
uboost_classifier = uBoostClassifier(
algorithm=algorithm, efficiency_steps=5, **params)
bdt_classifier = uBoostBDT(algorithm=algorithm, **params)
for classifier in [bdt_classifier, uboost_classifier]:
classifier.fit(trainX, trainY)
predict_proba = classifier.predict_proba(testX)
predict = classifier.predict(testX)
assert roc_auc_score(testY, predict_proba[:, 1]) > 0.7, \
"quality is awful"
print("Accuracy = %.3f" % accuracy_score(testY, predict))
def test_categorical_gb(n_samples=100000, n_features=10, p=0.7):
y = numpy.random.random(n_samples) > 0.5
X = numpy.random.randint(40, size=[n_samples, n_features]) * 2
X += numpy.random.random(size=[n_samples, n_features]) > p
X += y[:, numpy.newaxis]
from sklearn.cross_validation import train_test_split
trainX, testX, trainY, testY = train_test_split(X, y)
boosters = {
'old': GradientBoostingClassifier(n_estimators=100, min_samples_split=50, max_depth=5),
'cat': CommonGradientBoosting(loss=AdaLossFunction(), subsample=0.5, dtype=int,
base_estimator=CategoricalTreeRegressor()),
'cat2': TreeGradientBoostingClassifier(loss=BinomialDeviance(), dtype='int', update_tree=False,
base_estimator=SimpleCategoricalRegressor(n_features=2, n_attempts=3, method='cv')),
'cat3': TreeGradientBoostingClassifier(loss=BinomialDeviance(), dtype='int', update_tree=False,
base_estimator=ObliviousCategoricalRegressor(n_features=10, n_categories_power=5, splits=1, pfactor=0.5)),
'cat2-2': TreeGradientBoostingClassifier(loss=BinomialDeviance(), dtype='int', update_tree=False, n_threads=2,
base_estimator=SimpleCategoricalRegressor(n_features=2, n_attempts=1)),
'cat-linear': CategoricalLinearClassifier(),
}
for name, booster in boosters.items():
start = time.time()
booster.fit(trainX, trainY)
auc = roc_auc_score(testY, booster.predict_proba(testX)[:, 1])
print(name, "spent:{:3.2f} auc:{}".format(time.time() - start, auc))
def test_factory():
factory = ClassifiersFactory()
try:
from rep.estimators.tmva import TMVAClassifier
factory.add_classifier('tmva', TMVAClassifier())
except ImportError:
pass
factory.add_classifier('rf', RandomForestClassifier(n_estimators=10))
factory.add_classifier('ada', AdaBoostClassifier(n_estimators=20))
X, y, sample_weight = generate_classification_data()
assert factory == factory.fit(X, y, sample_weight=sample_weight, features=list(X.columns), parallel_profile='threads-4')
for cl in factory.values():
assert list(cl.features) == list(X.columns)
proba = factory.predict_proba(X, parallel_profile='threads-4')
labels = factory.predict(X, parallel_profile='threads-4')
for key, val in labels.items():
score = accuracy_score(y, val)
print(key, score)
assert score > 0.7, key
for key, val in proba.items():
assert numpy.allclose(val.sum(axis=1), 1), 'probabilities do not sum to 1'
assert numpy.all(val >= 0.), 'negative probabilities'
auc_score = roc_auc_score(y, val[:, 1])
print(auc_score)
assert auc_score > 0.8
for key, iterator in factory.staged_predict_proba(X).items():
assert key != 'tmva', 'tmva does not support staged pp'
for p in iterator:
assert p.shape == (len(X), 2)
# checking that last iteration coincides with previous
assert numpy.all(p == proba[key])
# testing picklability
dump_string = cPickle.dumps(factory)
clf_loaded = cPickle.loads(dump_string)
assert type(factory) == type(clf_loaded)
probs1 = factory.predict_proba(X)
probs2 = clf_loaded.predict_proba(X)
for key, val in probs1.items():
assert numpy.all(val == probs2[key]), 'something strange was loaded'
report = ClassificationReport({'rf': factory['rf']}, LabeledDataStorage(X, y, sample_weight))
report.feature_importance_shuffling(roc_auc_score_mod).plot(new_plot=True, figsize=(18, 3))
report = factory.test_on_lds(LabeledDataStorage(X, y, sample_weight))
report = factory.test_on(X, y, sample_weight=sample_weight)
val = numpy.mean(X['column0'])
check_report_with_mask(report, "column0 > %f" % (val / 2.), X)
check_report_with_mask(report, lambda x: numpy.array(x['column0']) < val * 2., X)
check_report_with_mask(report, None, X)
def test_workability(n_samples=10000, n_features=10, distance=0.5):
trainX, trainY = generate_sample(n_samples=n_samples, n_features=n_features, distance=distance)
testX, testY = generate_sample(n_samples=n_samples, n_features=n_features, distance=distance)
for booster in [FoldingGBClassifier, TreeGradientBoostingClassifier]:
for loss in [BinomialDeviance(), AdaLossFunction()]:
for update in [True, False]:
for base in [FastTreeRegressor(max_depth=3), FastNeuroTreeRegressor(max_depth=3)]:
if numpy.random.random() > 0.7:
clf = booster(loss=loss, n_estimators=100,
base_estimator=base, update_tree=update)
clf.fit(trainX, trainY)
auc = roc_auc_score(testY, clf.predict_proba(testX)[:, 1])
print('booster', booster, loss, 'update=', update, ' base=', base.__class__,
' quality=', auc)
assert auc > 0.8
def generate_split_result(model_config, X, y, split_id, splitter, cvgroup, reraise=False):
# Splitting
train_indices, trest_indices = splitter.split()
fold_group = cvgroup.require_group(split_id)
try:
fold_group.attrs['config'] = splitter.what().id()
fold_group.create_dataset('test_indices', data=trest_indices, compression=compression) # uncompressible
fold_group.create_dataset('y_test', data=y[trest_indices], compression=compression)
except:
pass # Dodgy
# Model configuration
model_group = fold_group.require_group('model=%s' % model_config.nickname)
try:
# already done?
if 'DONE' in fold_group.keys():
print '%s already done, skipping...' % model_group.name
return
if 'FAILED' in fold_group.keys():
print '%s already failed, skipping...' % model_group.name
return
# compute the result
scores, model, train_time, test_time = \
train_test(model_config.seed_model(expid), X, y, train_indices, trest_indices)
# save scores, auc, times
try:
model_group.attrs['auc'] = roc_auc_score(y[trest_indices], scores)
except:
model_group.attrs['auc'] = None
model_group.attrs['train_time'] = train_time
model_group.attrs['test_time'] = test_time
model_group.create_dataset('test_scores', data=scores, compression=compression)
# save whatever from the model
model_config.storer.to_hdf5(model, model_group, compression=compression)
# done
model_group['DONE'] = 'Finished on %s' % strftime("%c")
except Exception:
model_group['FAILED'] = format_exc()
if reraise:
raise
def test_gb_quality(n_samples=10000, n_features=10, distance=0.5):
trainX, trainY = generate_sample(n_samples=n_samples, n_features=n_features, distance=distance)
testX, testY = generate_sample(n_samples=n_samples, n_features=n_features, distance=distance)
# Multiplying by random matrix
multiplier = numpy.random.normal(size=[n_features, n_features])
shift = numpy.random.normal(size=[1, n_features]) * 5
trainX = numpy.dot(trainX.values, multiplier) + shift
testX = numpy.dot(testX.values, multiplier) + shift
boosters = {
'old_boost': GradientBoostingClassifier(n_estimators=100, min_samples_split=50, max_depth=5, subsample=0.3),
'fast+old_tree': CommonGradientBoosting(n_estimators=100,
base_estimator=DecisionTreeRegressor(min_samples_split=50, max_depth=5)),
'fast+neuro': TreeGradientBoostingClassifier(n_estimators=100, update_tree=True,
base_estimator=FastNeuroTreeRegressor()),
'fold+tree': FoldingGBClassifier(loss=BinomialDeviance(), n_estimators=10, update_tree=True,
base_estimator=FastNeuroTreeRegressor()),
'ugb': uGradientBoostingClassifier(loss=AdaLossFunction(),
n_estimators=100, min_samples_split=50, max_depth=5, update_tree=True, subsample=0.3)
}
for criterion in ['mse', # 'fmse', # 'pvalue',
# 'significance',
'significance2',
# 'gini',
'entropy',
'poisson'
]:
boosters['fast-' + criterion[:4]] = TreeGradientBoostingClassifier(n_estimators=100, update_tree=True,
base_estimator=FastTreeRegressor(criterion=criterion))
for name, booster in boosters.items():
start = time.time()
booster.fit(trainX, trainY)
auc = roc_auc_score(testY, booster.predict_proba(testX)[:, 1])
print(name, "spent:{:3.2f} auc:{}".format(time.time() - start, auc))
def test_refitting(n_samples=10000, n_features=10, distance=0.5):
trainX, trainY = generate_sample(n_samples=n_samples, n_features=n_features, distance=distance)
testX, testY = generate_sample(n_samples=n_samples, n_features=n_features, distance=distance)
booster = TreeGradientBoostingClassifier(n_estimators=100, update_tree=True,
base_estimator=FastTreeRegressor())
booster.fit(trainX, trainY)
print(roc_auc_score(testY, booster.predict_proba(testX)[:, 1]))
print(roc_auc_score(trainY, booster.predict_proba(trainX)[:, 1]))
booster.refit_trees(trainX, trainY)
print(roc_auc_score(testY, booster.predict_proba(testX)[:, 1]))
print(roc_auc_score(trainY, booster.predict_proba(trainX)[:, 1]))
booster.refit_trees(testX, testY)
print(roc_auc_score(testY, booster.predict_proba(testX)[:, 1]))
print(roc_auc_score(trainY, booster.predict_proba(trainX)[:, 1]))
def fit_logregs(dest_dir=MALARIA_LOGREGS_EXPERIMENT_ROOT,
# Logreg params
logreg_penalty='l1',
logreg_C=1.0,
logreg_class_weight_auto=False,
logreg_dual=False,
logreg_tol=1e-4,
logreg_fit_intercept=True,
logreg_intercept_scaling=1,
# CV params
num_cv_folds=10,
cv_seeds=(0,),
save_unlabelled_predictions=False,
save_fold_model=False,
min_fold_auc=0.88,
# Fingerprint folding params
fingerprint_folder_seed=0,
fingerprint_fold_size=1023,
# Computational requirements params
force=False,
chunksize=1000000):
"""Logistic regression experiment using the liblinear wrapper in sklearn.
Generates cross-val results
"""
### TODO Remove
if logreg_tol < 1E-5:
info('Ignoring long intolerant experiments')
return
info('Malaria logregs experiment')
# Command line type inference is rotten...
logreg_C = float(logreg_C)
logreg_tol = float(logreg_tol)
logreg_intercept_scaling = float(logreg_intercept_scaling)
num_cv_folds = int(num_cv_folds)
min_fold_auc = float(min_fold_auc)
fingerprint_folder_seed = int(fingerprint_folder_seed)
fingerprint_fold_size = int(fingerprint_fold_size)
chunksize = int(chunksize)
# Example providers
folder = None if fingerprint_fold_size < 1 else MurmurFolder(seed=fingerprint_folder_seed,
fold_size=fingerprint_fold_size)
rf_lab, rf_amb, rf_unl, rf_scr = malaria_logreg_fpt_providers(folder)
info('Data description: %s' % rf_lab.configuration().id(full=True))
# Experiment context: data
data_id = rf_lab.configuration().id(full=True)
data_dir = op.join(dest_dir, data_id)
ensure_dir(data_dir)
for cv_seed in cv_seeds:
# Command line type inference is rotten...
cv_seed = int(cv_seed)
# Deterministic randomness
my_rng = np.random.RandomState(seed=cv_seed)
# Experiment context: model
logreg_params = OrderedDict((
('penalty', logreg_penalty),
('C', logreg_C),
('class_weight', 'auto' if logreg_class_weight_auto else None),
('dual', logreg_dual),
('tol', logreg_tol),
('fit_intercept', logreg_fit_intercept),
('intercept_scaling', logreg_intercept_scaling),
('random_state', my_rng.randint(low=0, high=1000 ** 4)),
))
model_setup = LogisticRegression(**logreg_params)
model_id = 'skllogreg__%s' % '__'.join(['%s=%s' % (k, str(v)) for k, v in logreg_params.iteritems()])
model_dir = op.join(data_dir, model_id)
ensure_dir(model_dir)
info('Model: %s' % model_id)
# Experiment context: eval
eval_id = 'cv__cv_seed=%d__num_folds=%d' % (cv_seed, num_cv_folds)
eval_dir = op.join(model_dir, eval_id)
ensure_dir(eval_dir)
info('Eval: %d-fold cross validation (seed=%d)' % (num_cv_folds, cv_seed))
# Already done?
info_file = op.join(eval_dir, 'info.json')
if op.isfile(info_file) and not force:
info('\tAlready done, skipping...')
return # Oh well, a lot have been done up to here... rework somehow
# Anytime we see this file, we know we need to stop
stop_computing_file = op.join(eval_dir, 'STOP_BAD_FOLD')
#---------
#--------- Time to work!
#---------
# Save model config
joblib.dump(model_setup, op.join(model_dir, 'model_setup.pkl'), compress=3)
# Read labelled data in
info('Reading data...')
X, y = rf_lab.Xy()
info('ne=%d; nf=%d' % rf_lab.X().shape)
# Save molids... a bit too ad-hoc...
save_molids(data_dir, 'lab', rf_lab.ids())
if save_unlabelled_predictions:
save_molids(data_dir, 'unl', rf_unl.ids())
save_molids(data_dir, 'scr', rf_scr.ids())
save_molids(data_dir, 'amb', rf_amb.ids())
# Save folding information.
# By now, all the folds have already been computed:
# - because we cached X
# - and in this case we are warranted that no new unfolded features will appear at test time
if folder is not None:
info('Saving the map folded_features -> unfolded_feature...')
folded2unfolded_file = op.join(data_dir, 'folded2unfolded.h5')
if not op.isfile(folded2unfolded_file):
with h5py.File(folded2unfolded_file) as h5:
h5['f2u'] = folder.folded2unfolded()
folder_light_file = op.join(data_dir, 'folder.pkl')
if not op.isfile(folder_light_file):
folder_light = copy(folder) # Shallow copy
folder_light.clear_cache()
joblib.dump(folder_light, folder_light_file, compress=3)
# Cross-val splitter
cver = cv_splits(num_points=len(y),
Y=y,
num_folds=num_cv_folds,
rng=my_rng,
stratify=True)
# Fit and classify
for cv_fold_num in xrange(num_cv_folds):
fold_info_file = op.join(eval_dir, 'fold=%d__info.json' % cv_fold_num)
if op.isfile(fold_info_file):
info('Fold %d already done, skipping' % cv_fold_num)
continue
if op.isfile(stop_computing_file):
info('Bad fold detected, no more computations required')
break
# Split into train/test
train_i, test_i = cver(cv_fold_num)
Xtrain, ytrain = X[train_i, :], y[train_i]
Xtest, ytest = X[test_i, :], y[test_i]
# Copy the model...
model = clone(model_setup)
start = time()
info('Training...')
model.fit(Xtrain, ytrain)
train_time = time() - start
info('Model fitting has taken %.2f seconds' % train_time)
if save_fold_model:
info('Saving trained model')
joblib.dump(model, op.join(eval_dir, 'fold=%d__fitmodel.pkl' % cv_fold_num), compress=3)
info('Predicting and saving results...')
with h5py.File(op.join(eval_dir, 'fold=%d__scores.h5' % cv_fold_num), 'w') as h5:
start = time()
# Test indices
h5['test_indices'] = test_i
# Model
h5['logreg_coef'] = model.coef_
h5['logreg_intercept'] = model.intercept_
# Test examples
info('Scoring test...')
scores_test = model.predict_proba(Xtest)
fold_auc = roc_auc_score(ytest, scores_test[:, 1])
fold_enrichment5 = enrichment_at(ytest, scores_test[:, 1], percentage=0.05)
info('Fold %d ROCAUC: %.3f' % (cv_fold_num, fold_auc))
info('Fold %d Enrichment at 5%%: %.3f' % (cv_fold_num, fold_enrichment5))
h5['test'] = scores_test.astype(np.float32)
if save_unlabelled_predictions:
predict_malaria_unlabelled(model,
h5,
rf_amb=rf_amb,
rf_scr=rf_scr,
rf_unl=rf_unl,
chunksize=chunksize)
test_time = time() - start
info('Predicting has taken %.2f seconds' % test_time)
# Finally save meta-information for the fold
metainfo = mlexp_info_helper(
title='malaria-trees-oob',
data_setup=data_id,
model_setup=model_id,
exp_function=giveupthefunc(),
)
metainfo.update((
('train_time', train_time),
('test_time', test_time),
('auc', fold_auc),
('enrichment5', fold_enrichment5),
))
with open(fold_info_file, 'w') as writer:
json.dump(metainfo, writer, indent=2, sort_keys=False)
# One last thing, should we stop now?
if fold_auc < min_fold_auc:
stop_message = 'The fold %d was bad (auc %.3f < %.3f), skipping the rest of the folds' % \
(cv_fold_num, fold_auc, min_fold_auc)
info(stop_message)
with open(stop_computing_file, 'w') as writer:
writer.write(stop_message)
# Summarize cross-val in the info file
metainfo = mlexp_info_helper(
title='malaria-trees-oob',
data_setup=data_id,
model_setup=model_id,
exp_function=giveupthefunc(),
)
metainfo.update((
('num_cv_folds', num_cv_folds),
('cv_seed', cv_seed),
))
metainfo.update(logreg_params.items())
with open(info_file, 'w') as writer:
json.dump(metainfo, writer, indent=2, sort_keys=False)
def roc_auc_score_mod(y_true, prob, sample_weight=None):
return roc_auc_score(y_true, prob[:, 1], sample_weight=sample_weight)
nb.fit(train_dtm, y_train)
y_pred = nb.predict(test_dtm)
from sklearn.metrics import metrics
print metrics.accuracy_score(y_test, y_pred)
#92% Accuracy
#Task 6
# Map five to 1 and 1 to 0
y_test[y_test ==1] = 0
y_test[y_test == 5 ] = 1
y_pred_prob = nb.predict_proba(test_dtm)[:,1]
print metrics.roc_auc_score(y_test, y_pred_prob)
#Task 7
import matplotlib.pyplot as plt
fpr, tpr, thresholds = metrics.roc_curve(y_test, y_pred_prob)
plt.plot(fpr, tpr)
plt.xlim([0.0, 1.0])
plt.ylim([0.0, 1.0])
plt.xlabel('False Positive Rate (1 - Specificity)')
plt.ylabel('True Positive Rate (Sensitivity)')
#Task 8
print metrics.confusion_matrix(y_test, y_pred)
sensitivity = 126 / float(25 + 126)
specificity = 813/ float(813 + 58)
#Task 9
false_positives = X_test[y_test < y_pred] # false positives
