def performNN(all_extracted_features, all_targets):
from pyneurgen.neuralnet import NeuralNet
#from pyneurgen.nodes import BiasNode, Connection
net = NeuralNet()
net.init_layers(len(all_extracted_features[0]), [2], 1)
net.randomize_network()
net.set_halt_on_extremes(True)
# Set to constrain beginning weights to -5 to 5
# Just to show we can
#net.set_random_constraint(.5)
net.set_learnrate(.001)
net.set_all_inputs(all_extracted_features)
net.set_all_targets(all_targets)
length = len(all_extracted_features)
learn_end_point = int(length * .8)
net.set_learn_range(0, learn_end_point)
net.set_test_range(learn_end_point + 1, length - 1)
net.layers[1].set_activation_type('tanh')
net.learn(epochs=150, show_epoch_results=True, random_testing=True)
mse = net.test()
print mse
def buildIrisNetwork(all_inputs, all_targets):
net = NeuralNet()
net.init_layers(4, [6], 3)
net.randomize_network()
net.set_halt_on_extremes(True)
# Set to constrain beginning weights to -.5 to .5
# Just to show we can
#net.set_random_constraint(.5)
net.set_learnrate(.1)
net.set_all_inputs(all_inputs)
net.set_all_targets(all_targets)
length = len(all_inputs)
learn_end_point = int(length * .5)
net.set_learn_range(0, learn_end_point)
net.set_test_range(learn_end_point + 1, length-1)
net.layers[0].set_activation_type('tanh')
net.layers[1].set_activation_type('tanh')
net.layers[2].set_activation_type('threshold')
return net
def buildIrisNetwork(all_inputs, all_targets):
net = NeuralNet()
net.init_layers(4, [6], 3)
net.randomize_network()
net.set_halt_on_extremes(True)
# Set to constrain beginning weights to -.5 to .5
# Just to show we can
#net.set_random_constraint(.5)
net.set_learnrate(.1)
net.set_all_inputs(all_inputs)
net.set_all_targets(all_targets)
length = len(all_inputs)
learn_end_point = int(length * .5)
net.set_learn_range(0, learn_end_point)
net.set_test_range(learn_end_point + 1, length - 1)
net.layers[0].set_activation_type('tanh')
net.layers[1].set_activation_type('tanh')
net.layers[2].set_activation_type('threshold')
return net
from iris import neurgenData
from src.utilities import percentError
# Build the inputs
all_inputs, all_targets = neurgenData()
net = NeuralNet()
net.init_layers(4, [6], 3)
net.randomize_network()
net.set_halt_on_extremes(True)
# Set to constrain beginning weights to -.5 to .5
# Just to show we can
#net.set_random_constraint(.5)
net.set_learnrate(.1)
net.set_all_inputs(all_inputs)
net.set_all_targets(all_targets)
length = len(all_inputs)
learn_end_point = int(length * .5)
net.set_learn_range(0, learn_end_point)
net.set_test_range(learn_end_point + 1, length - 1)
net.layers[0].set_activation_type('tanh')
net.layers[1].set_activation_type('tanh')
net.layers[2].set_activation_type('tanh')
iterations = 500
scaler_x = MinMaxScaler()
x_train = scaler_x.fit_transform(x_train)
x_test = scaler_x.transform(x_test)
scaler_y = MinMaxScaler()
y_train = scaler_y.fit_transform(y_train)
y_test = scaler_y.transform(y_test)
x_input = np.concatenate(
(x_train, x_test, np.zeros((1, np.shape(x_train)[1]))))
y_input = np.concatenate((y_train, y_test, np.zeros((1, 1))))
#elaboracao do modelo de rede neural com os parametros definidos
fit1 = NeuralNet()
fit1.init_layers(input_nodes, [hidden_nodes], output_nodes,
ElmanSimpleRecurrent())
fit1.randomize_network()
fit1.layers[1].set_activation_type('sigmoid')
fit1.set_learnrate(0.05)
fit1.set_all_inputs(x_input)
fit1.set_all_targets(y_input)
fit1.set_learn_range(0, i)
fit1.set_test_range(i, i + 1)
fit1.learn(epochs=100, show_epoch_results=True, random_testing=False)
mse = fit1.test()
all_mse.append(mse)
print("test set MSE = ", np.round(mse, 6))
target = [item[0][0] for item in fit1.test_targets_activations]
target = scaler_y.inverse_transform(
np.array(target).reshape((len(target), 1)))
pred = [item[1][0] for item in fit1.test_targets_activations]
pred = scaler_y.inverse_transform(np.array(pred).reshape((len(pred), 1)))
real_y_test.append(target[0][0])
predicted_y_test.append(pred[0][0])
# Build the inputs
for position, target in population_gen(population):
pos = float(position)
all_inputs.append([random.random(), pos * factor])
all_targets.append([target])
net = NeuralNet()
net.init_layers(2, [10], 1)
net.randomize_network()
net.set_halt_on_extremes(True)
# Set to constrain beginning weights to -.5 to .5
# Just to show we can
net.set_random_constraint(.5)
net.set_learnrate(.1)
net.set_all_inputs(all_inputs)
net.set_all_targets(all_targets)
length = len(all_inputs)
learn_end_point = int(length * .8)
net.set_learn_range(0, learn_end_point)
net.set_test_range(learn_end_point + 1, length - 1)
net.layers[1].set_activation_type('tanh')
net.learn(epochs=125, show_epoch_results=True,
random_testing=False)
for position, target in population_gen(population):
pos = float(position)
all_inputs.append([random.random(), pos * factor])
all_targets.append([target])
# instantiate and initialize a neural network
net = NeuralNet()
net.init_layers(2, [10], 1)
net.randomize_network()
net.set_halt_on_extremes(True)
net.set_random_constraint(.5)
net.set_learnrate(.1) # alpha
net.set_all_inputs(all_inputs)
net.set_all_targets(all_targets)
length = len(all_inputs)
learn_end_point = int(length * .8)
net.set_learn_range(0, learn_end_point)
net.set_test_range(learn_end_point + 1, length - 1)
net.layers[1].set_activation_type(
'tanh') # set activation function of hidden layer
# start running
net.learn(epochs=125, show_epoch_results=True, random_testing=False)
def serNeural(sDay,nAhead,x0,hWeek):
nLin = sDay.shape[0] + nAhead
nFit = sDay.shape[0] if int(x0['obs_time']) <= 14 else int(x0['obs_time'])
predS = getHistory(sDay,nAhead,x0,hWeek)
weekS = [x.isocalendar()[1] for x in sDay.index]
population = [[float(i),sDay['y'][i],float(i%7),weekS[i]] for i in range(sDay.shape[0])]
all_inputs = []
all_targets = []
factorY = sDay['y'].mean()
factorT = 1.0 / float(len(population))*factorY
factorD = 1./7.*factorY
factorW = 1./52.*factorY
factorS = 4.*sDay['y'].std()
factorH = factorY/sDay['hist'].mean()
def population_gen(population):
pop_sort = [item for item in population]
# random.shuffle(pop_sort)
for item in pop_sort:
yield item
for t,y,y1,y2 in population_gen(population):
#all_inputs.append([t*factorT,(.5-random.random())*factorS+factorY,y1*factorD,y2*factorW])
all_inputs.append([y1*factorD,(.5-random.random())*factorS+factorY,y2*factorW])
all_targets.append([y])
if False:
plt.plot([x[0] for x in all_inputs],'-',label='targets0')
plt.plot([x[1] for x in all_inputs],'-',label='targets1')
plt.plot([x[2] for x in all_inputs],'-',label='targets2')
# plt.plot([x[3] for x in all_inputs],'-',label='targets3')
plt.plot([x[0] for x in all_targets],'-',label='actuals')
plt.legend(loc='lower left', numpoints=1)
plt.show()
net = NeuralNet()
net.init_layers(3,[10],1,NARXRecurrent(3,.6,2,.4))
net.randomize_network()
net.set_random_constraint(.5)
net.set_learnrate(.1)
net.set_all_inputs(all_inputs)
net.set_all_targets(all_targets)
#predS['pred'] = [item[0][0] for item in net.test_targets_activations]
length = len(all_inputs)
learn_end_point = int(length * .8)
# random.sample(all_inputs,10)
net.set_learn_range(0, learn_end_point)
net.set_test_range(learn_end_point + 1, length - 1)
net.layers[1].set_activation_type('tanh')
net.learn(epochs=125,show_epoch_results=True,random_testing=False)
mse = net.test()
#net.save(os.environ['LAV_DIR'] + "/out/train/net.txt")
test_positions = [item[0][0] for item in net.get_test_data()]
all_targets1 = [item[0][0] for item in net.test_targets_activations]
all_actuals = [item[1][0] for item in net.test_targets_activations]
# This is quick and dirty, but it will show the results
plt.subplot(3, 1, 1)
plt.plot([i for i in sDay['y']],'-')
plt.title("Population")
plt.grid(True)
plt.subplot(3, 1, 2)
plt.plot(test_positions, all_targets1, 'b-', label='targets')
plt.plot(test_positions, all_actuals, 'r-', label='actuals')
plt.grid(True)
plt.legend(loc='lower left', numpoints=1)
plt.title("Test Target Points vs Actual Points")
plt.subplot(3, 1, 3)
plt.plot(range(1, len(net.accum_mse) + 1, 1), net.accum_mse)
plt.xlabel('epochs')
plt.ylabel('mean squared error')
plt.grid(True)
plt.title("Mean Squared Error by Epoch")
plt.show()
input_nodes = 1
hidden_nodes = 10
output_nodes = 1
output_order = 1
input_order = 1
incoming_weight_from_output = 0.3
incoming_weight_from_input = 0.6
fit1 = NeuralNet()
fit1.init_layers(
input_nodes, [hidden_nodes], output_nodes,
NARXRecurrent(output_order, incoming_weight_from_output, input_order,
incoming_weight_from_input))
fit1.randomize_network()
fit1.layers[1].set_activation_type('sigmoid')
fit1.set_learnrate(0.35)
fit1.set_all_inputs(x)
fit1.set_all_targets(y)
length = len(x)
learn_end_point = int(length * 0.85)
fit1.set_learn_range(0, learn_end_point)
fit1.set_test_range(learn_end_point + 1, length - 1)
fit1.learn(epochs=10, show_epoch_results=True, random_testing=False)
mse = fit1.test()
print("MSE for test set: ", round(mse, 6))
plt.figure(figsize=(15, 6))
plt.plot(np.arange(len(fit1.accum_mse)), fit1.accum_mse)