def crossValidate(x, y, cv=5, K=None):
"""
:param y: N*L ranking vectors
:return:
"""
results = {"perf": []}
## cross validation ##
np.random.seed(1100)
kf = KFold(n_splits=cv, shuffle=True, random_state=0)
for train, test in kf.split(x):
x_train = x[train, :]
y_train = y[train, :]
x_test = x[test, :]
y_test = y[test, :]
y_pred = KNNMallows(K=K).fit(x_train, y_train).predict(x_test)
# print y_pred ### test
results["perf"].append(perfMeasure(y_pred, y_test, rankopt=True))
# print results["perf"][-1]
for key in results.keys():
item = np.array(results[key])
mean = np.nanmean(item, axis=0)
std = np.nanstd(item, axis=0)
results[key] = [mean, std]
return results
def hyperParameter(x, y, x_valid=None, y_valid=None, cv=5, criteria=0):
if x_valid is None:
# no validation set, using cross validation #
alpha_perform = []
kf = KFold(n_splits=cv, shuffle=True, random_state=0)
for train, valid in kf.split(x):
x_train = x[train, :]
y_train = y[train, :]
x_valid = x[valid, :]
y_valid = y[valid, :]
tree = DecisionTree().buildtree(x_train, y_train)
alpha_list = tree.alphalist()
alpha_best = [-1, None]
for alpha in alpha_list:
y_pred = tree.predict(x_valid, alpha=alpha)
perf = perfMeasure(y_pred, y_valid, rankopt=True)
perf_criteria = perf[criteria]
if alpha_best[1] is not None and alpha_best[1] > perf_criteria:
pass
else:
alpha_best[0] = alpha
alpha_best[1] = perf_criteria
alpha_perform.append(alpha_best)
alpha_perform = np.array(alpha_perform, dtype=np.float32)
print "inside hyperparameter:", alpha_perform ### test
return np.average(alpha_perform, axis=0)[0]
else:
tree = DecisionTree().buildtree(x, y)
alpha_list = tree.alphalist()
alpha_best = [-1, None]
for alpha in alpha_list:
y_pred = tree.predict(x_valid, alpha=alpha)
perf = perfMeasure(y_pred, y_valid, rankopt=True)
perf_criteria = perf[criteria]
if alpha_best[1] is not None and alpha_best[1] > perf_criteria:
pass
else:
alpha_best[0] = alpha
alpha_best[1] = perf_criteria
return alpha_best[0]
def crossValidate(x,y, cv=5, alpha = 0.0, rank_weight = False, stop_criterion_mis_rate = None, stop_criterion_min_node = 1,
stop_criterion_gain = 0.0, prune_criteria = 0):
results = {"alpha": [], "perf": []}
# cross validation #
np.random.seed(1100)
kf = KFold(n_splits=cv, shuffle=True, random_state=0) ## for testing fixing random_state
for train, test in kf.split(x):
x_train = x[train, :]
y_train = y[train, :]
x_test = x[test, :]
y_test = y[test, :]
# training and predict
if alpha == None:
## nested select validate and test ##
print "start searching alpha:", datetime.now() ### test
alpha_sel = hyperParameter(x_train, y_train, criteria=prune_criteria)
print "finish searching alpha:", datetime.now(), alpha ### test
else:
alpha_sel = alpha
# weight #
if rank_weight:
weights = rank2Weight(y_train)
else:
weights = None
tree = DecisionTree().buildtree(x_train,y_train, weights,
stop_criterion_mis_rate= stop_criterion_mis_rate,
stop_criterion_min_node = stop_criterion_min_node,
stop_criterion_gain=stop_criterion_gain)
# prune #
alpha_list = tree.alphalist()
# performance measure
y_pred = tree.predict(x_test, alpha_sel)
results["perf"].append(perfMeasure(y_pred, y_test, rankopt=True))
results["alpha"].append(alpha_sel)
print alpha_sel, "alpha"
for key in results.keys():
item = np.array(results[key])
mean = np.nanmean(item, axis=0)
std = np.nanstd(item, axis=0)
results[key] = [mean, std]
return results
def crossValidate(x, y, cv=5):
results = {"perf": []}
np.random.seed(1100)
kf = KFold(n_splits=cv, shuffle=True, random_state=0)
for train, test in kf.split(x):
x_train = x[train, :]
y_train = y[train, :]
x_test = x[test, :]
y_test = y[test, :]
y_pred = LabelWiseRanking().fit(x_train, y_train).predict(x_test)
results["perf"].append(perfMeasure(y_pred, y_test, rankopt=True))
for key in results.keys():
item = np.array(results[key])
mean = np.nanmean(item, axis=0)
std = np.nanstd(item, axis=0)
results[key] = [mean, std]
return results
def crossValidate(x,y, method = "dT",cv=5, alpha = None, min_node = 1):
# error measure
results = []
if method == "logReg":
results = {"perf":[], "coef":[], "interc":[]}
elif method == "dT":
results = {"alpha": [], "perf":[]}
# cross validation #
np.random.seed(1100)
kf = KFold(n_splits = cv, shuffle = True, random_state = 0) ## for testing fixing random_state
for train,test in kf.split(x):
x_train = x[train,:]
y_train = y[train,:]
x_test = x[test,:]
y_test = y[test,:]
# training and predict
if alpha == None:
## nested select validate and test ##
# print "start searching alpha:", datetime.now() ### test
alpha_sel, perf = DTme.hyperParometer(x_train,y_train)
# print "finish searching alpha:", datetime.now(), alpha ### test
else:
alpha_sel = alpha
result = decisionTree(x_train, y_train, x_test, alpha = alpha_sel, min_node = min_node)
# performance measure
alpha_sel, y_pred = result
results["perf"].append(perfMeasure(y_pred,y_test,rankopt=True))
results["alpha"].append(alpha_sel)
print alpha_sel, "alpha"
for key in results.keys():
item = np.array(results[key])
mean = np.nanmean(item, axis = 0)
std = np.nanstd(item, axis = 0)
results[key] = [mean, std]
return results
def crossValidate(x, y, cv=5):
results = {"perf": [], "coef": [], "interc": []}
# cross validation #
np.random.seed(1100)
kf = KFold(n_splits=cv, shuffle=True,
random_state=0) ## for testing fixing random_state
for train, test in kf.split(x):
x_train = x[train, :]
y_train = y[train, :]
x_test = x[test, :]
y_test = y[test, :]
# from multilabel to multiclass based on independencec assumption
x_train, y_train = multiClass(x_train, y_train)
# feature standardization #
scaler = preprocessing.StandardScaler().fit(x_train)
x_train = scaler.transform(x_train)
x_test = scaler.transform(x_test)
# training and predict
result = logRegFeatureEmotion(x_train, y_train, x_test)
# performance measure
y_pred, coef, interc = result
results["perf"].append(perfMeasure(y_pred, y_test))
results["coef"].append(coef)
results["interc"].append(interc)
for key in results.keys():
item = np.array(results[key])
mean = np.nanmean(item, axis=0)
std = np.nanstd(item, axis=0)
results[key] = [mean, std]
return results
