Exemplo n.º 1
0
def basic_iris():
    iris = datasets.load_iris()

    scaler = pre.Scaler()
    X = scaler.fit_transform(iris.data)
    
    y = ut.all_to_sparse( iris.target, max(iris.target) + 1 )
    X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(np.array(X), np.array(y), "iris")
    X_val = np.vstack([X_val, X_test]) 
    y_val = np.vstack([y_val, y_test]) 
    thetas, costs, val_costs = neur.gradient_decent(np.array(X), 
                                                    np.array(y),
                                                    #hidden_layer_sz = 11,
                                                    hidden_layer_sz = 20,
                                                    iter = 8000,
                                                    wd_coef = 0.0,
                                                    learning_rate = 0.07,
                                                    momentum_multiplier = 0.3,
                                                    rand_init_epsilon = 0.12,
                                                    do_early_stopping = True,
                                                    #do_dropout = True,
                                                    dropout_percentage = 0.9,
                                                    do_learning_adapt = True,
                                                    X_val = np.array(X_val),
                                                    y_val = np.array(y_val))
    h_x, a = neur.forward_prop(X_test, thetas)
    print "percentage correct predictions: ", ut.percent_equal(ut.map_to_max_binary_result(h_x), y_test)
    print "training error:",   costs[-1:][0]
    print "validation error:", val_costs[-1:][0]
    print "lowest validation error:", min(val_costs)
    plt.plot(costs, label='cost')
    plt.plot(val_costs, label='val cost')
    plt.legend()
    plt.ylabel('error rate')
    plt.show()        
Exemplo n.º 2
0
 def test_backprop(self):
     X = np.array([[1, 2, 3], [2, 3, 4]])
     y = np.array([[0, 0, 1], [0, 0, 1]])
     res, a = neur.forward_prop(X, [self.theta, self.theta2])
     grads = neur.backprop(a, y, [self.theta, self.theta2], 0)
     grads_check = neur.gradient_check(X, y, [self.theta, self.theta2], neur.logistic_squared_cost_function)
     self.equalish(grads[0], grads_check[0])
     self.equalish(grads[1], grads_check[1])
Exemplo n.º 3
0
    def test_forward_prop(self):
        X = np.array(([1, 2, 3], [2, 3, 4]))
        out, a = neur.forward_prop(X, [self.theta, self.theta2])

        expected_result = [[0.53407, 0.47487, 0.54053], [0.53427, 0.47419, 0.54133]]
        self.equalish(out, expected_result)
        self.equalish(a[2], out)
        self.equalish(a[1], [[1.00000, 0.59179, 0.56096], [1.00000, 0.61871, 0.58923]])
        self.equalish(a[0], [[1, 1, 2, 3], [1, 2, 3, 4]])

        out, a = neur.forward_prop(X, [self.theta, self.theta2, self.theta3])
        expected_result = [[0.52596, 0.46349], [0.52596, 0.46350]]
        self.equalish(out, expected_result)
        self.equalish(a[3], out)
        self.equalish(a[2], [[1.00000, 0.53407, 0.47487, 0.54053], [1.00000, 0.53427, 0.47419, 0.54133]])
        self.equalish(a[1], [[1.00000, 0.59179, 0.56096], [1.00000, 0.61871, 0.58923]])
        self.equalish(a[0], [[1, 1, 2, 3], [1, 2, 3, 4]])
Exemplo n.º 4
0
def basic_gradient_descent():
    data = np.genfromtxt('./stack_data_wide_val.csv', delimiter=',')
    X = data[:,:-1]
    y = data[:,-1:]

    scaler = pre.Scaler()
    X_val = scaler.fit_transform(X)

    y_val = np.array(map(lambda x: [0, 1] if x == 0 else [1, 0], y.flatten()))
    
    #X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(np.array(X), np.array(y), "basic_kaggle_data", True)
    #X_val = np.vstack([X_val, X_test]) 
    #y_val = np.vstack([y_val, y_test])

    hid_layer = 300

    mg = neur.split_xy(neur.mini_batch_gen_from_file('stack_data_wide_train.csv', 40), 
                       -1,
                       apply_x = lambda x: scaler.transform(x.astype(float)),
                       apply_y = lambda y: np.array(map(lambda x: [0, 1] if x == 0 else [1, 0], y.flatten()))
                       )

    #bm = rbm.RBM(13408, hid_layer)
    #costs = bm.optimize(neur.just_x(mg), 1000, 0.0007, val_set = X_val)

    #first_layer_weights = np.hstack([np.zeros((hid_layer,1)), bm.weights])
    #thetas  = neur.create_initial_thetas([64, hid_layer, 2], 0.12)
    #thetas[0] =  first_layer_weights

    # best so far minibatchsize 40 hidden layer 100 learning rate 0.01

    thetas, costs, val_costs = neur.gradient_decent_gen(mg, 
                                                    #hidden_layer_sz = 11,
                                                    hidden_layer_sz = hid_layer,
                                                    iter = 20000,
                                                    wd_coef = 0.0,
                                                    learning_rate = 0.01,
                                                    #thetas = thetas,
                                                    momentum_multiplier = 0.9,
                                                    rand_init_epsilon = 0.0012,
                                                    do_early_stopping = True,
                                                    #do_dropout = True,
                                                    #dropout_percentage = 0.5,
                                                    #do_learning_adapt = True,
                                                    X_val = np.array(X_val),
                                                    y_val = np.array(y_val)
                                                    )
    h_x, a = neur.forward_prop(X_val, thetas)
    binary_result = ut.map_to_max_binary_result(h_x)
    print "percentage correct predictions: ", ut.percent_equal(binary_result, y_val)
    print "training error:",   costs[-1:][0]
    print "validation error:", val_costs[-1:][0]
    print "lowest validation error:", min(val_costs)
    plt.plot(costs, label='cost')
    plt.plot(val_costs, label='val cost')
    plt.legend()
    plt.ylabel('error rate')
    plt.show()        
Exemplo n.º 5
0
 def test_backprop(self):
     X = np.array([[1, 2, 3], [2, 3, 4]])
     y = np.array([[0, 0, 1], [0, 0, 1]])
     res, a = neur.forward_prop(X, [self.theta, self.theta2])
     grads = neur.backprop(a, y, [self.theta, self.theta2], 0)
     grads_check = neur.gradient_check(X, y, [self.theta, self.theta2],
                                       neur.logistic_squared_cost_function)
     self.equalish(grads[0], grads_check[0])
     self.equalish(grads[1], grads_check[1])
Exemplo n.º 6
0
def autoencoder_example():
    mnist_train   = np.fromfile('mnist_training.csv', sep=" ")
    mnist_train   = np.array(mnist_train.reshape(256, 1000)).transpose()
    
    mnist_targets   = np.fromfile('mnist_training_targets.csv', sep=" ")
    mnist_targets   = np.array(mnist_targets.reshape(10, 1000)).transpose()
    
    X = mnist_train
    y = mnist_targets
    X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(np.array(X), np.array(y), "digits_rbm_mnist_autoencode")
    X_val = np.vstack([X_val, X_test]) 
    y_val = np.vstack([y_val, y_test]) 

    hid_layer = 300

    autoenc = ac.Autoencoder(X.shape[1], hid_layer, denoise = True, denoise_percent = 0.5)
    costs, val_costs = autoenc.optimize(X, iters = 1500, learning_rate = 0.1, val_set = X_val)

    print "::: first encoding done :::" 
    print "training error:",   costs[-1:][0]
    print "validation error:", val_costs[-1:][0]
    print "lowest validation error:", min(val_costs)
    plt.plot(costs, label='cost')
    plt.plot(val_costs, label='val cost')
    plt.legend()
    plt.ylabel('error rate')
    plt.show()        


    thetas  = neur.create_initial_thetas([64, hid_layer, 10], 0.12)
    thetas[0] = autoenc.encode_weights

    thetas, costs, val_costs = neur.gradient_decent(X, y,
                                                    learning_rate = 0.01,
                                                    hidden_layer_sz = hid_layer,
                                                    iter = 5000,
                                                    thetas = thetas,
                                                    X_val = X_val, 
                                                    y_val = y_val,
                                                    do_dropout = True,
                                                    dropout_percentage = 0.9,
                                                    do_early_stopping = True)

    h_x, a = neur.forward_prop(X_val, thetas)
    print "percentage correct predictions: ", ut.percent_equal(ut.map_to_max_binary_result(h_x), y_val)
    print "training error:",   costs[-1:][0]
    print "validation error:", val_costs[-1:][0]
    print "lowest validation error:", min(val_costs)
    plt.plot(costs, label='cost')
    plt.plot(val_costs, label='val cost')
    plt.legend()
    plt.ylabel('error rate')
    plt.show()        
Exemplo n.º 7
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    def test_forward_prop(self):
        X = np.array(([1, 2, 3], [2, 3, 4]))
        out, a = neur.forward_prop(X, [self.theta, self.theta2])

        expected_result = [[0.53407, 0.47487, 0.54053],
                           [0.53427, 0.47419, 0.54133]]
        self.equalish(out, expected_result)
        self.equalish(a[2], out)
        self.equalish(
            a[1], [[1.00000, 0.59179, 0.56096], [1.00000, 0.61871, 0.58923]])
        self.equalish(a[0], [[1, 1, 2, 3], [1, 2, 3, 4]])

        out, a = neur.forward_prop(X, [self.theta, self.theta2, self.theta3])
        expected_result = [[0.52596, 0.46349], [0.52596, 0.46350]]
        self.equalish(out, expected_result)
        self.equalish(a[3], out)
        self.equalish(a[2], [[1.00000, 0.53407, 0.47487, 0.54053],
                             [1.00000, 0.53427, 0.47419, 0.54133]])
        self.equalish(
            a[1], [[1.00000, 0.59179, 0.56096], [1.00000, 0.61871, 0.58923]])
        self.equalish(a[0], [[1, 1, 2, 3], [1, 2, 3, 4]])
Exemplo n.º 8
0
def rbm_example():
    digits = datasets.load_digits()
    X = digits.images.reshape((digits.images.shape[0], -1))
    X = (X / 16.0)
    y = ut.all_to_sparse(digits.target, max(digits.target) + 1)
    X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(
        np.array(X), np.array(y), "digits_rbm", True)
    X_val = np.vstack([X_val, X_test])
    y_val = np.vstack([y_val, y_test])

    hid_layer = 300

    bm = rbm.RBM(64, hid_layer)
    #exit()

    costs = bm.optimize(neur.mini_batch_generator(X), 2000, 0.08)
    print "validate squared_error", bm.validate(X_val)
    #exit()

    filename = './random_set_cache/data_rbm_run.pkl'

    first_layer_weights = np.hstack([np.zeros((hid_layer, 1)), bm.weights])
    #pickle.dump(first_layer_weights, open(filename, 'w'))

    # first_layer_weights = pickle.load(open(filename, 'r'))

    thetas = neur.create_initial_thetas([64, hid_layer, 10], 0.12)
    thetas[0] = first_layer_weights

    thetas, costs, val_costs = neur.gradient_decent_gen(
        izip(neur.mini_batch_generator(X, 10),
             neur.mini_batch_generator(y, 10)),
        learning_rate=0.05,
        hidden_layer_sz=hid_layer,
        iter=8000,
        thetas=thetas,
        X_val=X_val,
        y_val=y_val,
        do_early_stopping=True)

    h_x, a = neur.forward_prop(X_test, thetas)
    print "percentage correct predictions: ", ut.percent_equal(
        ut.map_to_max_binary_result(h_x), y_test)
    print "training error:", costs[-1:][0]
    print "validation error:", val_costs[-1:][0]
    print "lowest validation error:", min(val_costs)
    plt.plot(costs, label='cost')
    plt.plot(val_costs, label='val cost')
    plt.legend()
    plt.ylabel('error rate')
    plt.show()
Exemplo n.º 9
0
def rbm_example():
    digits = datasets.load_digits()
    X = digits.images.reshape((digits.images.shape[0], -1))
    X = (X / 16.0)
    y = ut.all_to_sparse( digits.target, max(digits.target) + 1 )
    X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(np.array(X), np.array(y), "digits_rbm", True)
    X_val = np.vstack([X_val, X_test]) 
    y_val = np.vstack([y_val, y_test]) 

    hid_layer = 300

    bm = rbm.RBM(64, hid_layer)
    #exit()
    
    costs = bm.optimize(neur.mini_batch_generator(X), 2000, 0.08)
    print "validate squared_error",  bm.validate(X_val)
    #exit()

    filename = './random_set_cache/data_rbm_run.pkl'

    first_layer_weights = np.hstack([np.zeros((hid_layer,1)), bm.weights])
    #pickle.dump(first_layer_weights, open(filename, 'w'))

    # first_layer_weights = pickle.load(open(filename, 'r'))

    thetas  = neur.create_initial_thetas([64, hid_layer, 10], 0.12)
    thetas[0] =  first_layer_weights

    thetas, costs, val_costs = neur.gradient_decent_gen(izip(neur.mini_batch_generator(X, 10), 
                                                             neur.mini_batch_generator(y, 10)),
                                                        learning_rate = 0.05,
                                                        hidden_layer_sz = hid_layer,
                                                        iter = 8000,
                                                        thetas = thetas, 
                                                        X_val = X_val, 
                                                        y_val = y_val,
                                                        do_early_stopping = True)

    h_x, a = neur.forward_prop(X_test, thetas)
    print "percentage correct predictions: ", ut.percent_equal(ut.map_to_max_binary_result(h_x), y_test)
    print "training error:",   costs[-1:][0]
    print "validation error:", val_costs[-1:][0]
    print "lowest validation error:", min(val_costs)
    plt.plot(costs, label='cost')
    plt.plot(val_costs, label='val cost')
    plt.legend()
    plt.ylabel('error rate')
    plt.show()        
Exemplo n.º 10
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def basic_gradient_descent():
    digits = datasets.load_digits()
    # iris = datasets.load_iris()
    X = digits.images.reshape((digits.images.shape[0], -1))

    scaler = pre.Scaler()
    X = scaler.fit_transform(X)

    y = ut.all_to_sparse(digits.target, max(digits.target) + 1)
    X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(
        np.array(X), np.array(y), "basic_grad_descent_digits")
    X_val = np.vstack([X_val, X_test])
    y_val = np.vstack([y_val, y_test])

    thetas, costs, val_costs = neur.gradient_decent_gen(
        izip(neur.mini_batch_generator(X, 10),
             neur.mini_batch_generator(y, 10)),
        #hidden_layer_sz = 11,
        hidden_layer_sz=100,
        iter=1000,
        wd_coef=0.0,
        learning_rate=0.1,
        momentum_multiplier=0.9,
        rand_init_epsilon=0.012,
        do_early_stopping=True,
        #do_dropout = True,
        #dropout_percentage = 0.8,
        #do_learning_adapt = True,
        X_val=np.array(X_val),
        y_val=np.array(y_val))
    h_x, a = neur.forward_prop(X_test, thetas)
    binary_result = ut.map_to_max_binary_result(h_x)
    print "percentage correct predictions: ", ut.percent_equal(
        binary_result, y_test)
    print "training error:", costs[-1:][0]
    print "validation error:", val_costs[-1:][0]
    print "lowest validation error:", min(val_costs)
    plt.plot(costs, label='cost')
    plt.plot(val_costs, label='val cost')
    plt.legend()
    plt.ylabel('error rate')
    plt.show()
Exemplo n.º 11
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def basic_gradient_descent():
    digits = datasets.load_digits()
    # iris = datasets.load_iris()
    X = digits.images.reshape((digits.images.shape[0], -1))

    scaler = pre.Scaler()
    X = scaler.fit_transform(X)

    y = ut.all_to_sparse(digits.target, max(digits.target) + 1)
    X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(
        np.array(X), np.array(y), "basic_grad_descent_digits"
    )
    X_val = np.vstack([X_val, X_test])
    y_val = np.vstack([y_val, y_test])

    thetas, costs, val_costs = neur.gradient_decent_gen(
        izip(neur.mini_batch_generator(X, 10), neur.mini_batch_generator(y, 10)),
        # hidden_layer_sz = 11,
        hidden_layer_sz=100,
        iter=1000,
        wd_coef=0.0,
        learning_rate=0.1,
        momentum_multiplier=0.9,
        rand_init_epsilon=0.012,
        do_early_stopping=True,
        # do_dropout = True,
        # dropout_percentage = 0.8,
        # do_learning_adapt = True,
        X_val=np.array(X_val),
        y_val=np.array(y_val),
    )
    h_x, a = neur.forward_prop(X_test, thetas)
    binary_result = ut.map_to_max_binary_result(h_x)
    print "percentage correct predictions: ", ut.percent_equal(binary_result, y_test)
    print "training error:", costs[-1:][0]
    print "validation error:", val_costs[-1:][0]
    print "lowest validation error:", min(val_costs)
    plt.plot(costs, label="cost")
    plt.plot(val_costs, label="val cost")
    plt.legend()
    plt.ylabel("error rate")
    plt.show()
Exemplo n.º 12
0
def basic_iris():
    iris = datasets.load_iris()

    scaler = pre.Scaler()
    X = scaler.fit_transform(iris.data)

    y = ut.all_to_sparse(iris.target, max(iris.target) + 1)
    X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(
        np.array(X), np.array(y), "iris")
    X_val = np.vstack([X_val, X_test])
    y_val = np.vstack([y_val, y_test])
    thetas, costs, val_costs = neur.gradient_decent(
        np.array(X),
        np.array(y),
        #hidden_layer_sz = 11,
        hidden_layer_sz=20,
        iter=8000,
        wd_coef=0.0,
        learning_rate=0.07,
        momentum_multiplier=0.3,
        rand_init_epsilon=0.12,
        do_early_stopping=True,
        #do_dropout = True,
        dropout_percentage=0.9,
        do_learning_adapt=True,
        X_val=np.array(X_val),
        y_val=np.array(y_val))
    h_x, a = neur.forward_prop(X_test, thetas)
    print "percentage correct predictions: ", ut.percent_equal(
        ut.map_to_max_binary_result(h_x), y_test)
    print "training error:", costs[-1:][0]
    print "validation error:", val_costs[-1:][0]
    print "lowest validation error:", min(val_costs)
    plt.plot(costs, label='cost')
    plt.plot(val_costs, label='val cost')
    plt.legend()
    plt.ylabel('error rate')
    plt.show()
Exemplo n.º 13
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def rbm_mnist_example():
    mnist_train   = np.fromfile('mnist_training.csv', sep=" ")
    mnist_train   = np.array(mnist_train.reshape(256, 1000)).transpose()
    
    mnist_targets   = np.fromfile('mnist_training_targets.csv', sep=" ")
    mnist_targets   = np.array(mnist_targets.reshape(10, 1000)).transpose()
    
    X = mnist_train
    y = mnist_targets
    X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(np.array(X), np.array(y), "digits_rbm_mnist")
    X_val = np.vstack([X_val, X_test]) 
    y_val = np.vstack([y_val, y_test]) 

    hid_layer = 300

    bm = rbm.RBM(256, hid_layer)
    #exit()
    
    costs = bm.optimize(X, 1000, 0.2, val_set = X_val)

    X = bm.prop_up(X)
    X_val = bm.prop_up(X_val)

    bm2 = rbm.RBM(hid_layer, hid_layer + 50)
    costs = bm2.optimize(X, 600, 0.2, val_set = X_val)

    X = bm2.prop_up(X)
    X_val = bm2.prop_up(X_val)

    bm3 = rbm.RBM(hid_layer + 50, hid_layer)
    costs = bm3.optimize(X, 600, 0.2, val_set = X_val)

    # lets change X


    
    filename = './random_set_cache/data_rbm_run_without_bias.pkl'

    first_layer_weights = np.hstack([np.zeros((hid_layer,1)), bm3.weights]) # without bias
    #first_layer_weights = np.hstack([bm.hidden_bias.reshape(hid_layer, 1), bm.weights]) # with bias

    #pickle.dump(first_layer_weights, open(filename, 'w'))

    #exit()

    #first_layer_weights = pickle.load(open(filename, 'r'))
    
    thetas  = neur.create_initial_thetas([64, hid_layer, 10], 0.12)
    thetas[0] =  first_layer_weights

    thetas, costs, val_costs = neur.gradient_decent(X, y,
                                                    learning_rate = 0.1,
                                                    hidden_layer_sz = hid_layer,
                                                    iter = 3000,
                                                    thetas = thetas,
                                                    X_val = X_val, 
                                                    y_val = y_val,
                                                    do_dropout = True,
                                                    dropout_percentage = 0.7,
                                                    do_early_stopping = True)

    h_x, a = neur.forward_prop(X_val, thetas)
    print "percentage correct predictions: ", ut.percent_equal(ut.map_to_max_binary_result(h_x), y_val)
    print "training error:",   costs[-1:][0]
    print "validation error:", val_costs[-1:][0]
    print "lowest validation error:", min(val_costs)
    plt.plot(costs, label='cost')
    plt.plot(val_costs, label='val cost')
    plt.legend()
    plt.ylabel('error rate')
    plt.show()        
Exemplo n.º 14
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def basic_gradient_descent():
    data = np.genfromtxt('./stack_data_wide_val.csv', delimiter=',')
    X = data[:, :-1]
    y = data[:, -1:]

    scaler = pre.Scaler()
    X_val = scaler.fit_transform(X)

    y_val = np.array(map(lambda x: [0, 1] if x == 0 else [1, 0], y.flatten()))

    #X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(np.array(X), np.array(y), "basic_kaggle_data", True)
    #X_val = np.vstack([X_val, X_test])
    #y_val = np.vstack([y_val, y_test])

    hid_layer = 300

    mg = neur.split_xy(neur.mini_batch_gen_from_file(
        'stack_data_wide_train.csv', 40),
                       -1,
                       apply_x=lambda x: scaler.transform(x.astype(float)),
                       apply_y=lambda y: np.array(
                           map(lambda x: [0, 1]
                               if x == 0 else [1, 0], y.flatten())))

    #bm = rbm.RBM(13408, hid_layer)
    #costs = bm.optimize(neur.just_x(mg), 1000, 0.0007, val_set = X_val)

    #first_layer_weights = np.hstack([np.zeros((hid_layer,1)), bm.weights])
    #thetas  = neur.create_initial_thetas([64, hid_layer, 2], 0.12)
    #thetas[0] =  first_layer_weights

    # best so far minibatchsize 40 hidden layer 100 learning rate 0.01

    thetas, costs, val_costs = neur.gradient_decent_gen(
        mg,
        #hidden_layer_sz = 11,
        hidden_layer_sz=hid_layer,
        iter=20000,
        wd_coef=0.0,
        learning_rate=0.01,
        #thetas = thetas,
        momentum_multiplier=0.9,
        rand_init_epsilon=0.0012,
        do_early_stopping=True,
        #do_dropout = True,
        #dropout_percentage = 0.5,
        #do_learning_adapt = True,
        X_val=np.array(X_val),
        y_val=np.array(y_val))
    h_x, a = neur.forward_prop(X_val, thetas)
    binary_result = ut.map_to_max_binary_result(h_x)
    print "percentage correct predictions: ", ut.percent_equal(
        binary_result, y_val)
    print "training error:", costs[-1:][0]
    print "validation error:", val_costs[-1:][0]
    print "lowest validation error:", min(val_costs)
    plt.plot(costs, label='cost')
    plt.plot(val_costs, label='val cost')
    plt.legend()
    plt.ylabel('error rate')
    plt.show()
Exemplo n.º 15
0
def rbm_mnist_example():
    mnist_train = np.fromfile('mnist_training.csv', sep=" ")
    mnist_train = np.array(mnist_train.reshape(256, 1000)).transpose()

    mnist_targets = np.fromfile('mnist_training_targets.csv', sep=" ")
    mnist_targets = np.array(mnist_targets.reshape(10, 1000)).transpose()

    X = mnist_train
    y = mnist_targets
    X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(
        np.array(X), np.array(y), "digits_rbm_mnist")
    X_val = np.vstack([X_val, X_test])
    y_val = np.vstack([y_val, y_test])

    hid_layer = 300

    bm = rbm.RBM(256, hid_layer)
    #exit()

    costs = bm.optimize(X, 1000, 0.2, val_set=X_val)

    X = bm.prop_up(X)
    X_val = bm.prop_up(X_val)

    bm2 = rbm.RBM(hid_layer, hid_layer + 50)
    costs = bm2.optimize(X, 600, 0.2, val_set=X_val)

    X = bm2.prop_up(X)
    X_val = bm2.prop_up(X_val)

    bm3 = rbm.RBM(hid_layer + 50, hid_layer)
    costs = bm3.optimize(X, 600, 0.2, val_set=X_val)

    # lets change X

    filename = './random_set_cache/data_rbm_run_without_bias.pkl'

    first_layer_weights = np.hstack([np.zeros((hid_layer, 1)),
                                     bm3.weights])  # without bias
    #first_layer_weights = np.hstack([bm.hidden_bias.reshape(hid_layer, 1), bm.weights]) # with bias

    #pickle.dump(first_layer_weights, open(filename, 'w'))

    #exit()

    #first_layer_weights = pickle.load(open(filename, 'r'))

    thetas = neur.create_initial_thetas([64, hid_layer, 10], 0.12)
    thetas[0] = first_layer_weights

    thetas, costs, val_costs = neur.gradient_decent(X,
                                                    y,
                                                    learning_rate=0.1,
                                                    hidden_layer_sz=hid_layer,
                                                    iter=3000,
                                                    thetas=thetas,
                                                    X_val=X_val,
                                                    y_val=y_val,
                                                    do_dropout=True,
                                                    dropout_percentage=0.7,
                                                    do_early_stopping=True)

    h_x, a = neur.forward_prop(X_val, thetas)
    print "percentage correct predictions: ", ut.percent_equal(
        ut.map_to_max_binary_result(h_x), y_val)
    print "training error:", costs[-1:][0]
    print "validation error:", val_costs[-1:][0]
    print "lowest validation error:", min(val_costs)
    plt.plot(costs, label='cost')
    plt.plot(val_costs, label='val cost')
    plt.legend()
    plt.ylabel('error rate')
    plt.show()
Exemplo n.º 16
0
def autoencoder_example():
    mnist_train = np.fromfile('mnist_training.csv', sep=" ")
    mnist_train = np.array(mnist_train.reshape(256, 1000)).transpose()

    mnist_targets = np.fromfile('mnist_training_targets.csv', sep=" ")
    mnist_targets = np.array(mnist_targets.reshape(10, 1000)).transpose()

    X = mnist_train
    y = mnist_targets
    X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(
        np.array(X), np.array(y), "digits_rbm_mnist_autoencode")
    X_val = np.vstack([X_val, X_test])
    y_val = np.vstack([y_val, y_test])

    hid_layer = 300

    autoenc = ac.Autoencoder(X.shape[1],
                             hid_layer,
                             denoise=True,
                             denoise_percent=0.5)
    costs, val_costs = autoenc.optimize(X,
                                        iters=1500,
                                        learning_rate=0.1,
                                        val_set=X_val)

    print "::: first encoding done :::"
    print "training error:", costs[-1:][0]
    print "validation error:", val_costs[-1:][0]
    print "lowest validation error:", min(val_costs)
    plt.plot(costs, label='cost')
    plt.plot(val_costs, label='val cost')
    plt.legend()
    plt.ylabel('error rate')
    plt.show()

    thetas = neur.create_initial_thetas([64, hid_layer, 10], 0.12)
    thetas[0] = autoenc.encode_weights

    thetas, costs, val_costs = neur.gradient_decent(X,
                                                    y,
                                                    learning_rate=0.01,
                                                    hidden_layer_sz=hid_layer,
                                                    iter=5000,
                                                    thetas=thetas,
                                                    X_val=X_val,
                                                    y_val=y_val,
                                                    do_dropout=True,
                                                    dropout_percentage=0.9,
                                                    do_early_stopping=True)

    h_x, a = neur.forward_prop(X_val, thetas)
    print "percentage correct predictions: ", ut.percent_equal(
        ut.map_to_max_binary_result(h_x), y_val)
    print "training error:", costs[-1:][0]
    print "validation error:", val_costs[-1:][0]
    print "lowest validation error:", min(val_costs)
    plt.plot(costs, label='cost')
    plt.plot(val_costs, label='val cost')
    plt.legend()
    plt.ylabel('error rate')
    plt.show()