def svm_cross_validate_category(X, y, category, C, penalty, sample_weights):
clf_svm_1 = SGDRegressor(loss=loss,
penalty=penalty,
epsilon=epsilon,
alpha=C,
shuffle=True)
clf_svm_2 = SGDRegressor(loss=loss,
penalty=penalty,
epsilon=epsilon,
alpha=C,
shuffle=True)
cv_indices = generate_cv_indices(category)
train_ids = cv_indices[0:N]
test_ids = cv_indices[N:2 * N]
clf_svm_1.fit(X[train_ids, :],
y[train_ids],
sample_weight=sample_weights[train_ids])
clf_svm_2.fit(X[test_ids, :],
y[test_ids],
sample_weight=sample_weights[test_ids])
score = np.zeros(2)
score[0] = clf_svm_1.score(X[test_ids, :], y[test_ids])
score[1] = clf_svm_2.score(X[train_ids, :], y[train_ids])
mean_score = np.mean(score)
y_1 = clf_svm_1.decision_function(X[test_ids, :])
y_2 = clf_svm_2.decision_function(X[train_ids, :])
u, indices = np.unique(category, return_inverse=True)
auc = np.zeros((2, len(u)))
for i in range(0, len(u)):
i_inds = indices == i
if (np.sum(test_ids & i_inds) != 0):
fpr, tpr, thresholds = metrics.roc_curve(y[test_ids & i_inds],
y_1[i_inds[test_ids]],
pos_label=1)
auc[0, i] = metrics.auc(fpr, tpr)
if (np.sum(train_ids & i_inds) != 0):
fpr, tpr, thresholds = metrics.roc_curve(y[train_ids & i_inds],
y_2[i_inds[train_ids]],
pos_label=1)
auc[1, i] = metrics.auc(fpr, tpr)
mean_auc = np.mean(auc, axis=0)
print("Finished running category cross-validation")
return mean_auc
def svm_cross_validate(X, y, category, C, penalty, sample_weights):
clf_svm_1 = SGDRegressor(loss=loss,
penalty=penalty,
epsilon=epsilon,
alpha=C,
shuffle=True)
clf_svm_2 = SGDRegressor(loss=loss,
penalty=penalty,
epsilon=epsilon,
alpha=C,
shuffle=True)
#N = len(category)
#half_data= np.floor(N/2)
#cv_indices_1= np.repeat([False],N)
#cv_indices_2= np.repeat([False],N)
#cv_indices_1[0:half_data] =True
#cv_indices_2[half_data:N] =True
#cv_indices= np.concatenate((cv_indices_1,cv_indices_2),axis=1)
cv_indices = generate_cv_indices_unbalanced(category)
train_ids = cv_indices[0:N]
test_ids = cv_indices[N:2 * N]
clf_svm_1.fit(X[train_ids, :],
y[train_ids],
sample_weight=sample_weights[train_ids])
clf_svm_2.fit(X[test_ids, :],
y[test_ids],
sample_weight=sample_weights[test_ids])
score = np.zeros(2)
score[0] = clf_svm_1.score(X[test_ids, :], y[test_ids])
score[1] = clf_svm_2.score(X[train_ids, :], y[train_ids])
mean_score = np.mean(score)
y_1 = clf_svm_1.decision_function(X[test_ids, :])
y_2 = clf_svm_2.decision_function(X[train_ids, :])
auc = np.zeros(2)
fpr, tpr, thresholds = metrics.roc_curve(y[test_ids], y_1, pos_label=1)
auc[0] = metrics.auc(fpr, tpr)
fpr, tpr, thresholds = metrics.roc_curve(y[train_ids], y_2, pos_label=1)
auc[1] = metrics.auc(fpr, tpr)
mean_auc = np.mean(auc, axis=0)
print("Finished running standard cross validation")
return mean_auc
class LinearRegressor(object):
def __init__(self,
decompose_func=None,
preprocessor=None,
nbits=15,
seed=1):
self.decompose_func = decompose_func
self.nbits = nbits
feature_size, bitmask = set_feature_size(nbits=nbits)
self.feature_size = feature_size
self.bitmask = bitmask
self.encoding_func = make_encoder(decompose_func,
preprocessors=preprocessor,
bitmask=self.bitmask,
seed=seed)
self.classifier = SGDRegressor(penalty='elasticnet')
def fit(self, graphs, targets):
data_mtx = vectorize_graphs(graphs,
encoding_func=self.encoding_func,
feature_size=self.feature_size)
# binarize
data_mtx.data = np.where(data_mtx.data > 0, 1, 0)
self.classifier.fit(data_mtx, targets)
return self
def decision_function(self, graphs):
# return probability associated to largest target type
data_mtx = vectorize_graphs(graphs,
encoding_func=self.encoding_func,
feature_size=self.feature_size)
# binarize
data_mtx.data = np.where(data_mtx.data > 0, 1, 0)
preds = self.classifier.decision_function(data_mtx)
return preds
def predict(self, graphs):
data_mtx = vectorize_graphs(graphs,
encoding_func=self.encoding_func,
feature_size=self.feature_size)
# binarize
data_mtx.data = np.where(data_mtx.data > 0, 1, 0)
preds = self.classifier.predict(data_mtx)
return preds
def decision_function(self, X, *args, **kw):
X = sp.csr_matrix(X)
return SGDRegressor.decision_function(self, X, *args, **kw)
coef_svm = clf_svm.coef_.ravel()
count = 0
outline = ""
out_coeffs = open("coeffs_full_huber_05172014_l2.csv", "w+")
for e, x in enumerate(header):
if (x == "label" or x == "id" or x == "category" or x == ""):
print(e, x, "nan")
count += 1
continue
print(e, x, coef_svm[e - count])
outline += x + "," + str(coef_svm[e - count]) + "\n"
out_coeffs.write(outline)
out_coeffs.close()
y_train = clf_svm.decision_function(X)
plt.scatter(y, y_train)
plt.show()
submission = np.array([ids, y_train])
submission = np.transpose(submission)
np.savetxt("temp.csv", submission, fmt="%d,%1.6f")
X_test, y_test, category_test, header_test, id_test = extract_data(loc_test)
#X_test_interactions = get_category_interactions_test(X_test,category_test)
#X_test = np.concatenate((X_test, X_test_interactions),axis=1)
X_test = StandardScaler().fit_transform(X_test)
y_test = clf_svm.decision_function(X_test)
def decision_function(self, X, *args, **kw):
X = sp.csr_matrix(X)
return SGDRegressor.decision_function(self, X, *args, **kw)
#High frequency words
def truncate(s,k):
return (s[0:k])
# <codecell>
truncated_Row = truncate(SmapSortedIndex_Dec,5000)
# <codecell>
#Stochastic Gradient Descent
#X_Test = X[:,0:1000]
#Y_Test = Y[0:1000]
clf = SGDRegressor(alpha=0.0001, eta0=0.01, fit_intercept=True,
learning_rate='invscaling', loss='squared_loss', n_iter=20, p=0.1,
penalty='l2', power_t=0.25, rho=0.85, seed=0, shuffle=True,
verbose=0, warm_start=False)
clf.fit(X.transpose(), Y)
# <codecell>
clf.decision_function(X.transpose())
# <codecell>
