def pr_curve(i):
label = labels[i]
statistics_l = Statistics()
print('Doing label {}'.format(label))
for train_idx, valid_idx in folds:
rng = np.random.RandomState()
rng.seed(seeds[i])
training_fold = developement_df.loc[train_idx, ]
training_fold = training_fold.reset_index(drop=True)
validation_fold = developement_df.loc[valid_idx, ]
validation_fold = validation_fold.reset_index(drop=True)
base_estimators = make_classifiers(method, balanced, labels, random_state=rng)
# Find the best params, then do a final proper calibration.
base_estimator = base_estimators[label]
estimator = RandomizedSearchCV(
estimator=base_estimator, param_distributions=params,
n_iter=60, scoring='f1', cv=3, random_state=rng,
error_score=0.0, n_jobs=1, pre_dispatch='2*n_jobs',
refit=True
)
# Set up the vectorizer for the bag-of-words representation
if vectorizer_method == 'tf-idf':
vectorizer = TfidfVectorizer(
stop_words=['go', '', ' '], binary=binary, lowercase=True,
sublinear_tf=False, max_df=1.0, min_df=0
)
vectorizer.fit(training_fold['terms'].values)
elif vectorizer_method == 'count':
vectorizer = CountVectorizer(
stop_words=['go', '', ' '], binary=binary, lowercase=True
)
vectorizer.fit(training_fold['terms'].values)
# Fit an evaluate the performance of the classifier.
x_train = vectorizer.transform(training_fold['terms'].values)
y_train = np.asarray(training_fold[label].values, dtype=int)
x_valid = vectorizer.transform(validation_fold['terms'].values)
y_valid = np.asarray(validation_fold[label].values, dtype=int)
estimator.fit(x_train, y_train)
for t in thresholds:
y_pred = [int(p[1] >= t) for p in estimator.predict_proba(x_valid)]
precision = precision_score(y_valid, y_pred, labels=[0, 1], pos_label=1)
recall = recall_score(y_valid, y_pred, labels=[0, 1], pos_label=1)
f1 = f1_score(y_valid, y_pred, labels=[0, 1], pos_label=1)
statistics_l.update_statistics(label=t, s_type='Precision', data=precision)
statistics_l.update_statistics(label=t, s_type='Recall', data=recall)
statistics_l.update_statistics(label=t, s_type='F1-Score', data=f1)
statistics_l.frame()['reaction'] = label
return statistics_l
def do_iteration(i):
print("Iteration " + str(i+1))
dev_df = train.copy(deep=True)
test_df = test.copy(deep=True)
rng = np.random.RandomState()
rng.seed(seeds[i])
folds_i = iterative_stratification(dev_df, labels, cv_folds, rng)
# Create the appropriate statistics container for this iteration.
validation_stats_i = Statistics()
testing_stats_i = Statistics()
for train_idx, valid_idx in cv_iterator(folds_i):
training_fold = dev_df.loc[train_idx, ]
validation_fold = dev_df.loc[valid_idx, ]
# shuffle the folds
training_fold = training_fold.reindex(rng.permutation(training_fold.index))
validation_fold = validation_fold.reindex(rng.permutation(validation_fold.index))
stats_valid, stats_test = multi_label_crf(
labels=labels,
df_train=training_fold,
df_valid=validation_fold,
df_test=test_df,
binary=binary,
connectivity='full',
vectorizer_method=vectorizer_method
)
validation_stats_i.merge(stats_valid)
testing_stats_i.merge(stats_test)
log.write('Iteration {}\n'.format(i))
validation_stats_i.write(log, 'a')
testing_stats_i.write(log, 'a')
return validation_stats_i, testing_stats_i
def do_fold(j):
print("\tFold " + str(j+1))
train_idx = folds_i[j][0]
valid_idx = folds_i[j][1]
training_fold = developement_df.loc[train_idx, ]
training_fold = training_fold.reset_index(drop=True)
validation_fold = developement_df.loc[valid_idx, ]
validation_fold = validation_fold.reset_index(drop=True)
# shuffle the folds
training_stats_i_f = Statistics()
validation_stats_i_f = Statistics()
testing_stats_i_f = Statistics()
# Init the label ranking lists.
label_pred_proba_train = []
label_pred_proba_valid = []
label_pred_proba_test = []
label_y_train = []
label_y_valid = []
label_y_test = []
# Set up the vectorizer for the bag-of-words representation
if vectorizer_method == 'tf-idf':
vectorizer = TfidfVectorizer(
stop_words=['go', '', ' '], binary=binary, lowercase=True,
sublinear_tf=True, max_df=1.0, min_df=0
)
vectorizer.fit(training_fold['terms'].values)
alpha = None
percentile = 100
elif vectorizer_method == 'count':
vectorizer = CountVectorizer(
stop_words=['go', '', ' '], binary=binary, lowercase=True
)
vectorizer.fit(training_fold['terms'].values)
alpha = None
percentile = 100
else:
raise TypeError("Vectorizer_method has type {}.".format(type(vectorizer_method)))
selectors = generate_selectors(selection, vectorizer.get_feature_names(), dag)
base_estimators = make_classifiers(method, balanced, labels, selectors, selection, rng)
for label in sorted(labels):
print("\t\tFitting for label {}...".format(label))
# SVMs make the assumption of standardised features. Hence we scale the features
# avoiding the use of mean to maintain the structure of count sparsity. Scaling
# May also help with linear model convergence speed.
x_train_l = vectorizer.transform(training_fold['terms'].values)
y_train_l = np.asarray(training_fold[label].values, dtype=int)
x_valid_l = vectorizer.transform(validation_fold['terms'].values)
y_valid_l = np.asarray(validation_fold[label].values, dtype=int)
x_test_l = vectorizer.transform(testing_df['terms'].values)
y_test_l = np.asarray(test_df_i[label].values, dtype=int)
if scale:
x_train_l = mean_center(x_train_l, with_mean=False)
x_valid_l = mean_center(x_valid_l, with_mean=False)
x_test_l = mean_center(x_test_l, with_mean=False)
# We generate the folds for randomised search up-front. We hold out one of the folds for
# Probability calibration so each sampled param set gets calibrated on the same data.
# This leaves cv_folds-2 folds for randomised search cross-validation.
# cv_rand = StratifiedKFold(n_splits=3, shuffle=True, random_state=rng)
base_estimator_l = base_estimators[label]
fresh_estimator = clone(base_estimator_l)
# Find the best params, then do a final proper calibration.
params = sk_generate_params(method, selection)
estimator_l = RandomizedSearchCV(
estimator=base_estimator_l, param_distributions=params,
n_iter=60, scoring='f1', cv=3, random_state=rng,
error_score=0.0, n_jobs=1, pre_dispatch='2*n_jobs',
refit=True
)
# Test if there's any signal if we permute the labels.
# Classifier should do poorly if we do so.
if permute:
y_train_l = rng.permutation(y_train_l)
threshold = 0.5
estimator_l.fit(x_train_l, y_train_l)
best_params_l = estimator_l.best_params_
# Calibrate the random forest with the best hyperparameters.
if method not in ['lr']:
estimator_l = CalibratedClassifierCV(fresh_estimator.set_params(**best_params_l),
cv=3, method='sigmoid')
estimator_l.fit(x_train_l, y_train_l)
# Evaluate Performance characteristics and test on training to check overfitting.
y_train_prob_l = estimator_l.predict_proba(x_train_l)
y_valid_prob_l = estimator_l.predict_proba(x_valid_l)
y_test_prob_l = estimator_l.predict_proba(x_test_l)
training_stats_i_f.merge(evaluate_model(y_train_l, y_train_prob_l, label, threshold))
validation_stats_i_f.merge(evaluate_model(y_valid_l, y_valid_prob_l, label,threshold))
# Compute independent test data performance
testing_stats_i_f.merge(evaluate_model(y_test_l, y_test_prob_l, label, threshold))
# Get label ranking info
label_pred_proba_train.append([p[1] for p in y_train_prob_l])
label_pred_proba_valid.append([p[1] for p in y_valid_prob_l])
label_pred_proba_test.append([p[1] for p in y_test_prob_l])
label_y_train.append(y_train_l)
label_y_valid.append(y_valid_l)
label_y_test.append(y_test_l)
print(validation_stats_i_f.frame())
# Compute multi-label performance statistics
y = np.vstack(zip(*label_y_train))
y_prob = np.vstack(zip(*label_pred_proba_train))
training_stats_i_f.merge(multi_label_evaluate(y, y_prob, threshold))
y = np.vstack(zip(*label_y_valid))
y_prob = np.vstack(zip(*label_pred_proba_valid))
validation_stats_i_f.merge(multi_label_evaluate(y, y_prob, threshold))
y = np.vstack(zip(*label_y_test))
y_prob = np.vstack(zip(*label_pred_proba_test))
testing_stats_i_f.merge(multi_label_evaluate(y, y_prob, threshold))
return training_stats_i_f, validation_stats_i_f, testing_stats_i_f
labels = get_labels_from_file('data/labels.tsv')
n = len(labels)
split_train = {l:0 for l in labels}
for l in labels:
split_train[l] = sum(developement_df[l].values)
split_test = {l:0 for l in labels}
for l in labels:
split_test[l] = sum(testing_df[l].values)
n_samples_train = len(developement_df)
n_samples_test = len(testing_df)
# Create the appropriate statistics container for the whole experiment.
training_stats = Statistics()
validation_stats = Statistics()
testing_stats = Statistics()
seeds = create_seeds(iterations)
min_class_freq = min(split_train.values())
cv_folds = min([min_class_freq, cv_folds])
statistics_objects = []
best_params = {l: {'score': 0.0, 'params': {}} for l in labels}
print("Running Supervised Ensemble Classification...")
# def do_iteration(i):
for i in range(iterations):
print("Iteration " + str(i+1))
rng = np.random.RandomState()
rng.seed(seeds[i])
dev_df_i = developement_df.copy(deep=True)
def evaluate_crf_model(x, y, estimator, labels, uniprot=None, verbose=0):
y_pred = np.asarray(estimator.predict(x))
statistics = Statistics()
statistics.update_statistics('all_labels', 'accuracy', estimator.score(x, y))
bin_labels = [0, 1]
for i, l in enumerate(labels):
y_true_binary_l = y[:, i].astype(int)
y_pred_binary_l = y_pred[:, i].astype(int)
label_stats = compute_label_statistics(y_true_binary_l, y_pred_binary_l, labels=bin_labels)
statistics.update_statistics(l, 'Accuracy', accuracy_score(y_true_binary_l, y_pred_binary_l))
statistics.update_statistics(l, 'Specifcity', label_stats[1]['specificity'])
statistics.update_statistics(l, 'Recall', label_stats[1]['sensitivity'])
statistics.update_statistics(l, 'Precision', label_stats[1]['precision'])
statistics.update_statistics(l, 'FDR', label_stats[1]['fdr'])
statistics.update_statistics(l, 'F-Score (beta=0.5)', fbeta_score(
y_true_binary_l, y_pred_binary_l, beta=0.5, labels=bin_labels, average='binary'
))
statistics.update_statistics(l, 'F-Score (beta=1)', fbeta_score(
y_true_binary_l, y_pred_binary_l, beta=1.0, labels=bin_labels, average='binary'
))
try:
roc_auc = roc_auc_score(y_true_binary_l, y_pred_binary_l, average="binary")
statistics.update_statistics(l, 'ROC-AUC', roc_auc)
except (ValueError, AssertionError):
statistics.update_statistics(l, 'ROC-AUC', np.NaN)
try:
pr_auc = average_precision_score(y_true_binary_l, y_pred_binary_l, average="binary")
statistics.update_statistics(l, 'PR-AUC', pr_auc)
except (ValueError, AssertionError):
statistics.update_statistics(l, 'PR-AUC', np.NaN)
if verbose:
for l in labels:
statistics.print_statistics(l)
if uniprot and verbose:
for u, p1, p2 in zip(uniprot, y, y_pred):
print("\t\t\tResult for {} \n\t\t\t\tTrue: \t{} ||| Pred: \t{}".format(u, p1, p2))
return statistics
def multi_label_crf(
labels,
df_train,
df_valid,
df_test,
binary,
connectivity='full',
vectorizer_method='count'
):
"""
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one class? Do you have signs of labels have dependency? If you answered yes to at least
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@param labels:
@param df_train:
@param df_valid:
@param df_test:
@param connectivity:
@param vectorizer_method:
@return:
"""
stats_container_valid = Statistics()
stats_container_test = Statistics()
if vectorizer_method == 'tf-idf':
vectorizer_node = TfidfVectorizer(
stop_words=['go:', '', ' '], binary=binary, lowercase=True, sublinear_tf=False, max_df=1.0, min_df=0)
vectorizer_node.fit(df_train['terms'].values)
alpha = None
percentile = 100
elif vectorizer_method == 'count':
vectorizer_node = CountVectorizer(stop_words=['go', '', ' '], binary=binary, lowercase=True)
vectorizer_node.fit(df_train['terms'].values)
alpha = None
percentile = 100
else:
raise TypeError("Vectorizer_method has type {}.".format(type(vectorizer_method)))
x_node_train, y_train, feature_names, selector_node = prep.select_features(
df = df_train,
vectorizer=vectorizer_node,
feature_col='terms',
label_col='label',
select_method=None,
continuous_col=[],
alpha=alpha,
percentile=percentile
)
x_node_valid, y_valid = prep.transform_features(
df=df_valid,
vectorizer=vectorizer_node,
selector=selector_node,
feature_col='terms',
label_col='label',
continuous_cols=[]
)
y_train = np.asarray([prep.binarise_labels(x, labels) for x in y_train], dtype=int)
y_valid = np.asarray([prep.binarise_labels(x, labels) for x in y_valid], dtype=int)
if connectivity == 'full' or connectivity == 'tree':
n_labels = len(labels)
edges = np.vstack([x for x in itertools.combinations(range(n_labels), 2)])
model = MultiLabelClf(n_labels=len(labels), edges=edges, inference_method='ad3')
elif connectivity == 'tree':
edges = chow_liu_tree(y_train)
model = MultiLabelClf(n_labels=len(labels), edges=edges, inference_method='max-product')
else:
edges = None
model = MultiLabelClf(n_labels=len(labels), edges=edges, inference_method='unary')
x_train = x_node_train.toarray()
x_valid = x_node_valid.toarray()
# -------------------- MAKE THE ESTIMATOR -------------------- #
estimator = OneSlackSSVM(model, max_iter=2, tol=0.001, n_jobs=1)
# -------------------- LEARN/STATS -------------------- #
estimator.fit(x_train, y_train)
stats_container_valid.merge(evaluate_crf_model(x_valid, y_valid, estimator, labels))
if isinstance(df_test, pd.DataFrame):
x_node_test, y_test = prep.transform_features(
df=df_test,
vectorizer=vectorizer_node,
selector=selector_node,
feature_col='terms',
label_col='label',
continuous_cols=[]
)
y_test = np.asarray([prep.binarise_labels(x, labels) for x in y_test], dtype=int)
x_test = x_node_test.toarray()
stats_container_test.merge(evaluate_crf_model(x_test, y_test, estimator, labels))
# -------------------- RETURN -------------------- #
if isinstance(df_test, pd.DataFrame):
return stats_container_valid, stats_container_test
else:
return stats_container_valid
def multi_label_evaluate(y, y_prob, threshold):
statistics = Statistics()
y_pred = (y_prob >= threshold).astype(int)
y_pred_50 = (y_prob >= 0.5).astype(int)
ranking_loss = label_ranking_loss(y, y_pred)
lraps = label_ranking_average_precision_score(y, y_pred)
ranking_loss_50 = label_ranking_loss(y, y_pred_50)
lraps_50 = label_ranking_average_precision_score(y, y_pred_50)
f1_macro = f1_score(y, y_pred, average='macro')
f1_macro_50 = f1_score(y, y_pred_50, average='macro')
statistics.update_statistics("Multi-Label", "Ranking Loss", ranking_loss)
statistics.update_statistics("Multi-Label", "Ranking Precision", lraps)
statistics.update_statistics("Multi-Label", "Ranking Loss (t=0.5)", ranking_loss_50)
statistics.update_statistics("Multi-Label", "Ranking Precision (t=0.5)", lraps_50)
statistics.update_statistics("Multi-Label", "Macro F1", f1_macro)
statistics.update_statistics("Multi-Label", "Macro F1 (t=0.5)", f1_macro_50)
try:
auc_macro = roc_auc_score(y, y_pred, average='macro')
auc_macro_50 = roc_auc_score(y, y_pred_50, average='macro')
auc_pr_macro = roc_auc_score(y, y_prob, average='macro')
statistics.update_statistics("Multi-Label", "Macro AUC", auc_macro)
statistics.update_statistics("Multi-Label", "Macro AUC (t=0.5)", auc_macro_50)
statistics.update_statistics("Multi-Label", "Macro AUC (Pr)", auc_pr_macro)
except ValueError:
statistics.update_statistics("Multi-Label", "Macro AUC", np.NaN)
statistics.update_statistics("Multi-Label", "Macro AUC (t=0.5)", np.NaN)
statistics.update_statistics("Multi-Label", "Macro AUC (Pr)", np.NaN)
return statistics
def evaluate_model(y, y_prob, label, threshold):
statistics = Statistics()
y_pred = (y_prob[:, 1] >= threshold).astype(int)
bin_labels = [0, 1]
label_stats = compute_label_statistics(y, y_pred, labels=bin_labels)
statistics.update_statistics(label, 'F (beta=1)', f1_score(y, y_pred, average='binary', labels=[0,1], pos_label=1))
statistics.update_statistics(label, 'Specificity', label_stats[1]['specificity'])
statistics.update_statistics(label, 'Recall', label_stats[1]['sensitivity'])
statistics.update_statistics(label, 'Precision', label_stats[1]['precision'])
statistics.update_statistics(label, 'FDR', label_stats[1]['fdr'])
try:
statistics.update_statistics(label, 'ROC-AUC', roc_auc_score(y, y_pred, average='weighted'))
except (ValueError, AssertionError):
statistics.update_statistics(label, 'ROC-AUC', 0.0)
try:
pr_auc = average_precision_score(y, y_pred, average='weighted')
if str(pr_auc) == 'nan':
pr_auc = 0.0
statistics.update_statistics(label, 'PR-AUC', pr_auc)
except (ValueError, AssertionError):
statistics.update_statistics(label, 'PR-AUC', 0.0)
return statistics
def do_iteration(data):
# for i in xrange(iterations):
i = data[0]
print("Iteration " + str(i+1))
train_i = train.copy(deep=True)
rng = np.random.RandomState()
rng.seed(seeds[i])
su_make_dir('llda/models/iteration-{}'.format(i+1))
folds_i = iterative_stratification(train_i, labels, cv_folds, rng)
combinations = itertools.combinations(range(0, cv_folds), cv_folds-1)
# Create the appropriate statistics container for this iteration.
validation_stats_i = Statistics()
testing_stats_i = Statistics()
for n, j in enumerate(combinations):
# print('\tFold ' + str(n+1))
su_make_dir('llda/models/iteration-{}/fold-{}'.format(i+1, n+1))
file_path = 'llda/models/iteration-{}/fold-{}/'.format(i+1, n+1)
training_folds_j = folds_i[list(j)]
validation_fold_j = folds_i[[f for f in range(0, cv_folds) if f not in j]]
assert len(validation_fold_j) == 1
training_fold = reduce(
lambda x, y: pd.concat([x, y], ignore_index=True, copy=True),
training_folds_j[1:],
training_folds_j[0]
)
validation_fold = validation_fold_j[0]
# shuffle the folds
if balanced:
training_fold = training_fold.reindex(rng.permutation(training_fold.index))
training_fold = prep.reduce_label_bias(training_fold, labels, 'activation', 5, random_state=rng)
training_fold = training_fold.reindex(rng.permutation(training_fold.index))
validation_fold = validation_fold.reindex(rng.permutation(validation_fold.index))
write_tsv(training_fold, file_path + '/train.tsv', test=False)
write_tsv(validation_fold, file_path + '/valid.tsv', test=True)
write_tsv(test, file_path + '/test.tsv', test=True)
# ------------------ CALL JAVA TO LLDA ON THIS PARTAY ----------------- #
DEVNULL = open(os.devnull, 'w')
args = [
'java',
'-jar',
'-Xmx2048m',
'llda/tmt-0.4.0.jar',
'llda/llda.scala',
file_path,
'/train.tsv',
'/valid.tsv',
'/test.tsv',
'model-{}-{}'.format(i+1, n+1),
'{}-{}'.format(i+1, n+1)
]
p = Popen(args, stdout=DEVNULL, stderr=STDOUT)
p.wait()
# Perform evaluation
validation_proba = np.genfromtxt('llda/results/validation-{}-{}.csv'.format(i+1, n+1), delimiter=',')[:, 1:]
test_proba = np.genfromtxt('llda/results/test-{}-{}.csv'.format(i+1, n+1), delimiter=',')[:, 1:]
labels_j = get_labels_from_model(file_path + '/llda-cvb0-model-{}-{}'.format(1+i, n+1))
validation_stats_i_j = Statistics()
testing_stats_i_j = Statistics()
for l_index, l in enumerate(labels_j):
y_validation = [p for p in validation_fold[l].values]
y_proba_validation = [[1-p, p] for p in validation_proba[:, l_index]]
y_pred_validation = [int(p >= threshold) for p in validation_proba[:, l_index]]
y_hprd = [p for p in test[l].values]
y_proba_hprd = [[1-p, p] for p in test_proba[:, l_index]]
y_pred_hprd = [int(p >= threshold) for p in test_proba[:, l_index]]
validation_stats_i_j = evaluate_model(
y=y_validation,
y_pred=y_pred_validation,
y_pred_prob=y_proba_validation,
label=l,
statistics=validation_stats_i_j,
verbose=0
)
testing_stats_i_j = evaluate_model(
y=y_hprd,
y_pred=y_pred_hprd,
y_pred_prob=y_proba_hprd,
label=l,
statistics=testing_stats_i_j,
verbose=0
)
validation_stats_i.merge(validation_stats_i_j)
testing_stats_i.merge(testing_stats_i_j)
return validation_stats_i, testing_stats_i
# ----------------------------- LOAD DATA ----------------------------------- #
train, test = prep.prep_data_frames(selection, load_interactome=False)
labels = get_labels_from_file('data/labels.tsv')
n = len(labels)
split_train = {l:0 for l in labels}
for l in labels:
split_train[l] = sum(train[l].values)
split_test = {l:0 for l in labels}
for l in labels:
split_test[l] = sum(test[l].values)
# Create the appropriate statistics container for the whole experiment.
validation_stats = Statistics()
testing_stats = Statistics()
seeds = create_seeds(iterations)
print("Running Labeled Latent Dirichlet Allocation...")
def do_iteration(data):
# for i in xrange(iterations):
i = data[0]
print("Iteration " + str(i+1))
train_i = train.copy(deep=True)
rng = np.random.RandomState()
rng.seed(seeds[i])
su_make_dir('llda/models/iteration-{}'.format(i+1))
folds_i = iterative_stratification(train_i, labels, cv_folds, rng)
combinations = itertools.combinations(range(0, cv_folds), cv_folds-1)
