Python svmutil.svm_train函数代码示例

def TrainSvmRbf(Y, X, sweep_c=range(-5,5), sweep_g=range(-5,5)):
    num_negatives = float(Y.count(-1))
    num_positives = float(Y.count(1))

    best_c = -1
    best_g = -1
    best_acc = -1
    for c_pow in sweep_c:
        for g_pow in sweep_g:
            current_c = np.power(2.0,c_pow)
            current_g = np.power(2.0,g_pow)
            prob = svm.svm_problem(Y,X)
            param = svm.svm_parameter('-v 5 -t 2 -c %f -g %f -w-1 %f -w1 %f -q' % (current_c,
                                                                                   current_g,
                                                                                   100/num_negatives,
                                                                                   100/num_positives))
            current_acc = svm.svm_train(prob, param)
            print 'c = %f, g = %f, cv acc = %f' % (current_c, current_g, current_acc)
            if best_acc < current_acc:
                best_acc = current_acc
                best_c = current_c
                best_g = current_g

    prob = svm.svm_problem(Y,X)
    param = svm.svm_parameter('-t 2 -c %f -g %f -w-1 %f -w1 %f -q' % (best_c, best_g,
                                                                      100/num_negatives,
                                                                      100/num_positives))
    svm_model = svm.svm_train(prob, param)
    p_labs, p_acc, p_vals = svm.svm_predict(Y, X, svm_model, '-q')
    pdb.set_trace()
    return svm_model

def calculate_race():
    correct = 0
    answers = []
    input = []
    count = 0
    for d in data:
        answers.append(question2b_race_truth.truth[count])
        input.append(d)
        if count == 49:
            break
        count += 1

    prob = svmutil.svm_problem(answers, input)
    param = svmutil.svm_parameter('-t 2 -c 4')
    param.cross_validation = 1
    param.nr_fold = 10
    cv = svmutil.svm_train(prob, param)

    param = svmutil.svm_parameter('-t 2 -c 4')
    m = svmutil.svm_train(prob, param)
    count = 0
    for d in data:
        if count < 50:
            count += 1
            continue
        else:
            x0, max_idx = gen_svm_nodearray(d)
            p = libsvm.svm_predict(m, x0)
            if p == question2b_race_truth.truth[count]:
                correct += 1
            count += 1
    return cv, correct / float(50) * 100

def TrainSvmLinear(Y, X, sweep_c=range(-2,8)):
    num_positives = float(Y.count(1))
    num_negatives = float(Y.count(-1))

    best_c = -1
    best_acc = -1
    for c_pow in sweep_c:
        current_c = np.power(2.0,c_pow)
        prob = svm.svm_problem(Y,X)
        param = svm.svm_parameter('-v 5 -t 0 -c %f -w-1 %f -w1 %f -q' % (current_c,
                                                                         100/num_negatives,
                                                                         100/num_positives))
        current_acc = svm.svm_train(prob, param)
        print '%f, %f' % (current_c, current_acc)
        if best_acc < current_acc:
            best_acc = current_acc
            best_c = current_c

        # recompute accuracy
        param = svm.svm_parameter('-t 0 -c %f -w-1 %f -w1 %f -q' % (best_c,
                                                                    100/num_negatives,
                                                                    100/num_positives))
        svm_model = svm.svm_train(prob, param)
        p_labs, p_acc, p_vals = svm.svm_predict(Y, X, svm_model, '-q')


    prob = svm.svm_problem(Y,X)
    param = svm.svm_parameter('-t 0 -c %f -w-1 %f -w1 %f -q' % (best_c,
                                                                100/num_negatives,
                                                                100/num_positives))
    svm_model = svm.svm_train(prob, param)
    p_labs, p_acc, p_vals = svm.svm_predict(Y, X, svm_model, '-q')
    pdb.set_trace()
    return svm_model

 def train(self):
     for i in range(4):
         self.convert()
         #rbf
         param1 = svmutil.svm_parameter("-t 2 -b 1 -c 1 -g 0.001")
         param2 = svmutil.svm_parameter("-t 2 -b 1 -c 0.1 -g 0.001")
         self.mr.append(svmutil.svm_train(self.problem[0], param1))#hist
         self.mr.append(svmutil.svm_train(self.problem[1], param2))#vector
         #linear
         param3 = svmutil.svm_parameter("-t 0 -b 1 -c 0.1")
         param4 = svmutil.svm_parameter("-t 0 -b 1 -c 0.01")
         self.ml.append(svmutil.svm_train(self.problem[0], param3))#hist
         self.ml.append(svmutil.svm_train(self.problem[1], param4))#vector
         self.images = self.images[1:]+self.images[:1]

def prob20():
    import random
    gamma = [1, 10, 100, 1000, 10000]
    chosen = {1:0, 10:0, 100:0, 1000:0, 10000:0}
    for _ in range(100):
        Eout = []
        for g in gamma:
            trainX, testX, trainy, testy = readdat()
            mul_label_2_bin(trainy, testy, 0)

            trainX = zip(trainX, trainy)
            random.shuffle(trainX)
            trainX, trainy = zip(*trainX)
            valX = trainX[:1000]
            valy = trainy[:1000]
            trainX = trainX[1000:]
            trainy = trainy[1000:]

            m = svmutil.svm_train(trainy, trainX, '-s 0 -t 2 -c 0.1 -g %f -h 0'%(g))
            p_label, p_acc, p_val = svmutil.svm_predict(valy, valX, m)

            Eout.append(100.0 - p_acc[0])
        chosen[gamma[Eout.index(min(Eout))]] += 1
    print "prob20: ",
    for k in chosen.keys():
        print "gamma=%d:%d, " % (k, chosen[k]),
    print ""

def CrossValidate(Y, X, param, k_folds=5):
    rand_idx = range(len(Y))
    random.shuffle(rand_idx)
    idx_groups = SplitIntoK(k_folds, rand_idx)
    pos_acc = 0
    neg_acc = 0
    for i in range(k_folds):
        test_idx = idx_groups[i]
        exclude_test = [idx_groups[j] for j in range(len(idx_groups)) if i != j]
        train_idx = list(chain(*exclude_test))

        Y_test = [Y[test_i] for test_i in test_idx]
        X_test = [X[test_i] for test_i in test_idx]        

        Y_train = [Y[train_i] for train_i in train_idx]
        X_train = [X[train_i] for train_i in train_idx]        

        # recompute accuracy
        prob = svm.svm_problem(Y_train,X_train)
        svm_model = svm.svm_train(prob, param)

        p_labs, p_acc, p_vals = svm.svm_predict(Y_test, X_test, svm_model, '-q')

        tps = sum([1 for j in range(len(p_labs)) if (p_labs[j]==1 and Y_test[j]==1)])
        fns = sum([1 for j in range(len(p_labs)) if (p_labs[j]==-1 and Y_test[j]==1)])

        tns = sum([1 for j in range(len(p_labs)) if (p_labs[j]==-1 and Y_test[j]==-1)])
        fps = sum([1 for j in range(len(p_labs)) if (p_labs[j]==1 and Y_test[j]==-1)])

        pos_acc += tps / float(tps + fns)
        neg_acc += tns / float(tns + fps)

    pos_acc = pos_acc / k_folds
    neg_acc = neg_acc / k_folds
    return (pos_acc, neg_acc)

    def train(cls, featuresets, params="-t 0 -q"):
        """Train a classifier using the given featuresets.

        Args:
            featuresets: List of featuresets.
            params: Parameter string to pass to svmutil.svm_parameter.

        Returns:
            SvmClassifier object.
        """
        all_features = set()
        all_labels = set()
        for featuredict, label in featuresets:
            all_features.update(set(featuredict.keys()))
            all_labels.add(label)
        all_labels = sorted(all_labels)
        all_features = sorted(all_features)
        featureindex = dict(zip(all_features, range(1, len(all_features) + 1)))
        labelindex = dict(zip(all_labels, range(1, len(all_labels) + 1)))
        vectors, labels = cls.featuresets_to_svm(featureindex, labelindex,
                                                 featuresets)
        prob = svmutil.svm_problem(labels, vectors)
        param = svmutil.svm_parameter(params)
        model = svmutil.svm_train(prob, param)
        return cls(featureindex, labelindex, model)

def main(path, k):
	
	prabs = []
	lns = []
	for kk in range(0,k-1):
		testLabel = []
		trainPoint = []
		trainLabel = []
		testPoint = []
		wcCount = 0
		for u in os.listdir(path): 
			if u[-2:] == 'WC':r
				wcCount += 1
				filePath = path+u
				WC = pickle.load(open(filePath, 'rb'))
				if wcCount % k == 0 + kk:
					testLabel.append(int(u[1]))
					testPoint.append(WC)
					
				else:
					trainLabel.append(int(u[1]))
					trainPoint.append(WC)

		lns.append(len(testLabel))
		prob = svmutil.svm_problem(trainLabel, trainPoint)
		param = svmutil.svm_parameter('-t 0 -c 4 -b 1 -q')


		m = svmutil.svm_train(prob, param)
		svmutil.svm_save_model('n.model', m)
		p_label, p_acc, p_val = svmutil.svm_predict(testLabel, testPoint, m, '-b 1')
		prabs.append(p_acc[0])

def train_test():
	train_subdir = "data/train/"
	test_subdir = "data/test/"
	img_kinds = ["happy", "anger", "neutral", "surprise"]
	models = {}
	params = "-t 0 -c 3"
	svm_params = {	"happy": params,
					"anger": params,
					"neutral": params,
					"surprise": params}

	#train the models
	print 'BUILDING TRAIN MODELS'
	for img_kind in img_kinds:
		print "\t" + img_kind
		problem = build_problem(img_kind, train_subdir)
		param = svm.svm_parameter(svm_params[img_kind])
		models[img_kind] = svmutil.svm_train(problem, param)
	print '================================'

	#for each image in test set let's see what is the answe
	total_count = 0
	correct_count = 0
	wrong_count = 0

	print 'TESTING MODELS'
	for img_kind in img_kinds:
		images = glob.glob(test_subdir + "f_" + img_kind + "*.jpg")
		for image in images:
			print "\t" + image
			image_data = cv.LoadImage(image)
			
			# Let's see what are the results from the models
			results = {}
			for kind in img_kinds:
				test_data = get_image_features(image_data, True, kind)
				predict_input_data = []
				predict_input_data.append(test_data)

				# do svm query
				(val, val_2, label) = svmutil.svm_predict([1] ,predict_input_data, models[kind])
				results[kind] = label[0][0]
			
			sorted_results = sorted(results.iteritems(), key=operator.itemgetter(1))
			result = sorted_results[len(sorted_results)-1][0]

			total_count += 1
			if result == img_kind:
				print 'YES :' + result
				correct_count += 1
			else:
				print 'NO  :' + result
				print sorted_results
				wrong_count += 1
			print '-----------------------'
	print '================================'
	print "Total Pictures: " + str(total_count)
	print "Correct: " + str(correct_count)
	print "Wrong: " + str(wrong_count)
	print "Accuracy: " + str(correct_count/float(total_count) * 100)

 def train(self,x,y):
     """
     training using y=list,x=dict
     parameter = string of parameters
     """
     prob=su.svm_problem(y,x)
     para=""
     para+= "-s %d -t %d -d %d -g %f -r %f -c %f -n %f -p %f -e %f -b %d" %\
         (
             self.type,
             self.kernel,
             self.degree,
             self.gamma,
             self.coef0,
             self.c,
             self.nu,
             self.p,
             self.eps,
             self.prob
         )
     if(self.v!=0):
         para+=" -v %d" % self.v
     if(self.q!=0):
         para+= " -q"
     print para
     para1=su.svm_parameter(para)
     self.model=su.svm_train(prob,para1)
     return True

 def __init__(self,train_feature_file = TRAIN_FEATURE_FILE):
     if os.path.exists(SAVED_MODEL):
         self.model = svmutil.svm_load_model(SAVED_MODEL)
     else:
         y, x = svmutil.svm_read_problem(train_feature_file)
         self.model = svmutil.svm_train(y, x, '-c 4')
         svmutil.svm_save_model(SAVED_MODEL,self.model)

def iqr_model_train(matrix_kernel_train, labels_train, idx2clipid,
                    svm_para = '-w1 50 -t 4 -b 1 -c 1'):
    """
    Light-weighted SVM learning module for online IQR

    @param matrix_kernel_train: n-by-n square numpy array with kernel values
        between training data
    @param labels_train: row-wise labels of training data (1 or True indicates
        positive, 0 or False otherwise
    @param idx2clipid: idx2clipid(row_idx) returns the clipid for the 0-base row
        in matrix
    @param svm_para: (optional) SVM learning parameter

    @rtype: dictionary with 'clipids_SV': list of clipids for support vectors
    @return: output as a dictionary with 'clipids_SV'

    """
    log = logging.getLogger('iqr_model_train')

    # set training inputs
    matrix_kernel_train = np.vstack((np.arange(1, len(matrix_kernel_train)+1),
                                     matrix_kernel_train)).T
    log.debug("Done matrix_kernel_train")

    problem = svm.svm_problem(labels_train.tolist(), matrix_kernel_train.tolist(), isKernel=True)
    log.debug("Done problem")
    svm_param = svm.svm_parameter(svm_para)
    log.debug("Done svm_param")

    # train model
    model = svmutil.svm_train(problem, svm_param)
    log.debug("Done train model")

    # release memory
    del problem
    del svm_param
    log.debug("Done release memory")

    # check learning failure
    if model.l == 0:
        raise Exception('svm model learning failure')
    log.debug("Done checking learning failure (no failure)")

    n_SVs = model.l
    clipids_SVs = []
    idxs_train_SVs = svmtools.get_SV_idxs_nonlinear_svm(model)
    for i in range(n_SVs):
        _idx_1base = idxs_train_SVs[i]
        _idx_0base = _idx_1base - 1
        clipids_SVs.append(idx2clipid[_idx_0base])
        model.SV[i][0].value = i+1 # within SVM model, index needs to be 1-base
    log.debug("Done collecting support vector IDs")

    #svmutil.svm_save_model(filepath_model, model)

    output = dict()
    output['model'] = model
    output['clipids_SVs'] = clipids_SVs

    return output

def train_test_model(train_datafile, test_datafile):
    from svmutil import svm_read_problem, svm_train, svm_predict
    y,x = svm_read_problem(train_datafile)
    m = svm_train(y,x,'-t 0 -e .01 -m 1000 -h 0')
    y_test,x_test = svm_read_problem(test_datafile)
    p_labs,p_acc,p_vals = svm_predict(y_test,x_test,m)
    return p_labs, p_acc, p_vals

	def valid(self,datasets,opt,opp,method = fold,part_ids = None,seed = None,test_data = None):
		if seed is None:
			# If seed is not set. UNIX time is used as seed.
			seed = time.time()
		saving_seed = "%s/log/%s.log.seed" % (self._dir,self._name)
		with open(saving_seed,"w") as fp:
			# Save used seed value.
			fp.write("seed:%f\n" % seed)
		
		if part_ids is None:
			part_ids = datasets.pids
		groups = [(test,train) for test,train in method(part_ids,seed = seed)]
		
		for cnt,pdtsts in enumerate(groups):
			# cnt is number of cluster.
			if test_data is None:
				test = False
				ltest,dtest,itest = test2svm_prob(datasets.mkTest(pdtsts[0]))
			else:
				test = True
				ltest,dtest,itest = test2svm_prob(test_data.mkTest(test_data.pids))

			print "start %s validation" % (cnt)
			ptrn,itrain = train2svm_prob(datasets.mkTrain(pdtsts[1]))
			#opt = svm.svm_parameter(opt)
			model = svmutil.svm_train(ptrn,opt)
			
			plbl,pacc,pval = svmutil.svm_predict(ltest,dtest,model,opp)

			# create saving direcotry
			#self._mkdir(cnt)
			# create log files
			self._save_log(itest,plbl,pval,cnt,test)
			model_name = "%s/model/%s.model.%s" % (self._dir,self._name,cnt)

def run_cross_validation(dTrain,dTest):
    'Work with Polynomal kernel with cross validation'
    print '--run_cross_validation--'

    print '-- 1 versus 5 with Q = 2 and Cross Validation--'

    Cs = [0.0001,0.001,0.01,0.1,1]
    Ecvs = [[],[],[],[],[]]
    
    print '-- Train and Test --'

    dTrain_shuffle = dTrain
    # Try 100 runs with different partitions
    for j in range(100):
        # roll those dices
        shuffle(dTrain_shuffle)
        # Get data and formated vectors
        dTrain_1vs5 = getDataOneVsOne(dTrain_shuffle,1,5)
        X_train_1vs5,Y_train_1vs5 = get_svm_vector_format(dTrain_1vs5)
        # Try all Cs with cross validation
        for i in range(len(Cs)):
            # Type = Polynomial. Degree = 2. Gamma 1.
            # Coef = 1. C = Cs[i].Cross Validation at 10. be quiet
            options = '-t 1 -d 2 -g 1 -r 1 -c '+str(Cs[i])+ ' -v 10 -q'
            m = svm_train(Y_train_1vs5,X_train_1vs5,options)
            Ecvs[i].append(100 - m)
    # display
    print
    for i in range(len(Ecvs)):
        print 'Ecv = %s \tfor C = %s'%(sum(Ecvs[i])/100.,Cs[i])
    print