def create_network(hidden_layer_size):
"""Creates sin NN.
:param hidden_layer_size: size of hidden layer
:return: network
"""
# Create network
network = FeedForwardNetwork()
# Create network layers and bias
input_layer = LinearLayer(1)
hidden_layer = SigmoidLayer(hidden_layer_size)
output_layer = SigmoidLayer(1)
bias = BiasUnit()
# Create connections
input_hidden_connection = FullConnection(input_layer, hidden_layer)
hidden_output_connection = FullConnection(hidden_layer, output_layer)
bias_hidden_connection = FullConnection(bias, hidden_layer)
bias_output_connection = FullConnection(bias, output_layer)
# Add network layers and bias to network
network.addInputModule(input_layer)
network.addModule(hidden_layer)
network.addOutputModule(output_layer)
network.addModule(bias)
# Add connections between layers and bias
network.addConnection(input_hidden_connection)
network.addConnection(hidden_output_connection)
network.addConnection(bias_hidden_connection)
network.addConnection(bias_output_connection)
# Sort modules and return network
network.sortModules()
return network
def set_nn(inp, hid1, out):
# Make a new FFN object:
n = FeedForwardNetwork()
# Constructing the input, output and hidden layers:
inLayer = LinearLayer(inp)
hiddenLayer1 = TanhLayer(hid1)
# hiddenLayer2 = TanhLayer(hid2)
outLayer = LinearLayer(out)
# Adding layers to the network:
n.addInputModule(inLayer)
n.addModule(hiddenLayer1)
# n.addModule(hiddenLayer2)
n.addOutputModule(outLayer)
# determining how neurons should be connected:
in_to_hidden = FullConnection(inLayer, hiddenLayer1)
# hid_to_hid = FullConnection(hiddenLayer1,hiddenLayer2)
hidden_to_out = FullConnection(hiddenLayer1, outLayer)
# Adding connections to the network
n.addConnection(in_to_hidden)
# n.addConnection(hid_to_hid)
n.addConnection(hidden_to_out)
# Final step that makes our MLP usable
n.sortModules()
return n
def apply_custom_network(self, hidden_counts):
"""
Changes a network to a new one with possibly multiple layers with various hidden neurons count
:param hidden_counts: an array of numbers of hidden nodes in every hidden layer. For example:
[3, 4, 5] means a NN with 3 hidden layers with 3 hidden neurons on 1st layer and so on...
:return: self
"""
network = FeedForwardNetwork()
in_layer = LinearLayer(self.inp_cnt)
network.addInputModule(in_layer)
out_layer = SoftmaxLayer(self.out_cnt)
network.addOutputModule(out_layer)
hidden_layer = SigmoidLayer(hidden_counts[0])
network.addModule(hidden_layer)
in_to_hidden = FullConnection(in_layer, hidden_layer)
network.addConnection(in_to_hidden)
for i in range(1, len(hidden_counts)):
last_hidden_layer = hidden_layer
hidden_layer = SigmoidLayer(hidden_counts[i])
network.addModule(hidden_layer)
hidden_to_hidden = FullConnection(last_hidden_layer, hidden_layer)
network.addConnection(hidden_to_hidden)
hidden_to_out = FullConnection(hidden_layer, out_layer)
network.addConnection(hidden_to_out)
network.sortModules()
self.network = network
return self
def build_network(hidden_layer_size):
"""Creates network
:param hidden_layer_size: hidden layer size
:return:
"""
network = FeedForwardNetwork()
# Create layers and bias unit
input_layer = LinearLayer(5)
hidden_layer = SigmoidLayer(hidden_layer_size)
output_layer = SigmoidLayer(1)
# output_layer = LinearLayer(1)
bias = BiasUnit()
# Create connections
input_to_hidden = FullConnection(input_layer, hidden_layer)
hidden_to_output = FullConnection(hidden_layer, output_layer)
bias_to_hidden = FullConnection(bias, hidden_layer)
bias_to_output = FullConnection(bias, output_layer)
# Add layers to network
network.addInputModule(input_layer)
network.addModule(hidden_layer)
network.addOutputModule(output_layer)
network.addModule(bias)
# Add connections to network
network.addConnection(input_to_hidden)
network.addConnection(hidden_to_output)
network.addConnection(bias_to_hidden)
network.addConnection(bias_to_output)
# Sort modules and return
network.sortModules()
return network
def testBank():
D = readData()
print len(D), 'samples', D.indim, 'features'
from pybrain import LinearLayer, FullConnection, FeedForwardNetwork, BiasUnit, SigmoidLayer
net = FeedForwardNetwork()
net.addInputModule(LinearLayer(D.indim, name='in'))
net.addModule(BiasUnit(name='bias'))
net.addOutputModule(SigmoidLayer(1, name='out'))
net.addConnection(FullConnection(net['in'], net['out']))
net.addConnection(FullConnection(net['bias'], net['out']))
net.sortModules()
p = net.params
p *= 0.01
provider = ModuleWrapper(D, net, shuffling=False)
algo = SGD(provider, net.params.copy(), #callback=printy,
learning_rate=5.5e-5)
#algo = vSGDfd(provider, net.params.copy(), #callback=printy
# )
printy(algo, force=True)
algo.run(len(D))
printy(algo, force=True)
algo.run(len(D))
printy(algo, force=True)
algo.run(len(D))
printy(algo, force=True)
algo.run(len(D))
printy(algo, force=True)
algo.run(len(D))
printy(algo, force=True)
def set_nn(inp,hid1,out):
# Make a new FFN object:
n = FeedForwardNetwork()
# Constructing the input, output and hidden layers:
inLayer = LinearLayer(inp)
hiddenLayer1 = TanhLayer(hid1)
# hiddenLayer2 = TanhLayer(hid2)
outLayer = LinearLayer(out)
# Adding layers to the network:
n.addInputModule(inLayer)
n.addModule(hiddenLayer1)
# n.addModule(hiddenLayer2)
n.addOutputModule(outLayer)
# determining how neurons should be connected:
in_to_hidden = FullConnection(inLayer, hiddenLayer1)
# hid_to_hid = FullConnection(hiddenLayer1,hiddenLayer2)
hidden_to_out = FullConnection(hiddenLayer1, outLayer)
# Adding connections to the network
n.addConnection(in_to_hidden)
# n.addConnection(hid_to_hid)
n.addConnection(hidden_to_out)
# Final step that makes our MLP usable
n.sortModules()
return n
def testBank():
D = readData()
print len(D), 'samples', D.indim, 'features'
from pybrain import LinearLayer, FullConnection, FeedForwardNetwork, BiasUnit, SigmoidLayer
net = FeedForwardNetwork()
net.addInputModule(LinearLayer(D.indim, name='in'))
net.addModule(BiasUnit(name='bias'))
net.addOutputModule(SigmoidLayer(1, name='out'))
net.addConnection(FullConnection(net['in'], net['out']))
net.addConnection(FullConnection(net['bias'], net['out']))
net.sortModules()
p = net.params
p *= 0.01
provider = ModuleWrapper(D, net, shuffling=False)
algo = SGD(
provider,
net.params.copy(), #callback=printy,
learning_rate=5.5e-5)
#algo = vSGDfd(provider, net.params.copy(), #callback=printy
# )
printy(algo, force=True)
algo.run(len(D))
printy(algo, force=True)
algo.run(len(D))
printy(algo, force=True)
algo.run(len(D))
printy(algo, force=True)
algo.run(len(D))
printy(algo, force=True)
algo.run(len(D))
printy(algo, force=True)
def testTraining(D):
print len(D), 'samples'
from core.datainterface import ModuleWrapper
from algorithms import SGD, vSGDfd
import pylab
from pybrain.datasets import SupervisedDataSet
from pybrain import LinearLayer, FullConnection, FeedForwardNetwork, TanhLayer, BiasUnit
from pybrain.utilities import dense_orth
net = FeedForwardNetwork()
net.addInputModule(LinearLayer(D.indim, name='in'))
net.addModule(BiasUnit(name='bias'))
net.addModule(TanhLayer(14, name='h'))
net.addOutputModule(LinearLayer(1, name='out'))
net.addConnection(FullConnection(net['in'], net['h']))
net.addConnection(FullConnection(net['bias'], net['h']))
net.addConnection(FullConnection(net['h'], net['out']))
net.addConnection(FullConnection(net['bias'], net['out']))
net.sortModules()
# tracking progress by callback
ltrace = []
def storer(a):
if a._num_updates % 10 == 0:
a.provider.nextSamples(250)
ltrace.append(pylab.mean(a.provider.currentLosses(a.bestParameters)))
x = net.params
x *= 0.001
f = ModuleWrapper(D, net)
#algo = SGD(f, net.params.copy(), callback=storer, learning_rate=0.0001)
algo = vSGDfd(f, net.params.copy(), callback=storer)
algo.run(10000)
pylab.plot(ltrace, 'r-')
pylab.xlabel('epochs x10')
pylab.ylabel('MSE')
pylab.show()
dateparse = lambda dates: pd.datetime.strptime(dates, '%Y-%m')
data = pd.read_csv('AirPassengers.csv', parse_dates=['Month'], index_col='Month', date_parser=dateparse)
ts = data['#Passengers']
# Make a new FFN object:
n = FeedForwardNetwork()
# Constructing the input, output and hidden layers:
inLayer = LinearLayer(3)
hiddenLayer = SigmoidLayer(4)
outLayer = LinearLayer(1)
# Adding layers to the network:
n.addInputModule(inLayer)
n.addModule(hiddenLayer)
n.addOutputModule(outLayer)
# determining how neurons should be connected:
in_to_hidden = FullConnection(inLayer, hiddenLayer)
hidden_to_out = FullConnection(hiddenLayer, outLayer)
# Adding connections to the network
n.addConnection(in_to_hidden)
n.addConnection(hidden_to_out)
# Final step that makes our MLP usable
n.sortModules()
# Create samples Train & Validation
training_samples = []
class NeuronDecider(BaseDecider):
"""
The class is responsible for learning to recognize certain group of objects.
Attributes
-----------
hiden_neurons : int
Number of hiden neurons.
OUTPUT_NEURONS : int
Number of output neurons.
input_neurons : int
Number of input neurons.
X_train : numpy array of array of floats
Each item of the array contains specific "coordinates" of the train
object in array.
X_test : numpy array of array of floats
Each item of the array contains specific "coordinates" of the test
object in array.
y_train : numpy array of ints
Each item of the array contains a number of the group which the train
object belongs. Position in the array
corresponds to item in X_train.
y_test : numpy array of ints
Each item of the array contains a number of the group which the test
object belongs. Position in the array
corresponds to item in X_test.
maxErr : float
Maximal error which would satisfy trainer
maxEpochs : int
Maximum number of epochs for training
"""
OUTPUT_NEURONS = 1
def __init__(self,
treshold=0.5,
hidden_neurons=2,
maxErr=None,
maxEpochs=20000):
"""
Parameters
-----------
hidden_neurons: int
Number of hidden neurons
maxErr : NoneType, float
Maximal error which would satisfy the trainer. In case of None trainUntilConvergence methods
is used
maxEpochs : int
Maximum number of epochs for training
Note
-----
Attributes with None values will be updated by setTrainer
and train methods
"""
self.hiden_neurons = hidden_neurons
self.input_neurons = None
self.X = None
self.y = None
self.treshold = treshold
self.maxEpochs = maxEpochs
self.maxErr = maxErr
self.net = None
def learn(self, searched, others):
"""
This method loads lists of specific values of searched objects and
others. Then the sample will be divided into train and
test samples according to user.
Parameters
-----------
searched : iterable
List of searched objects values (their "coordinates")
others : iterable
List of other objects values (their "coordinates")
Returns
-------
NoneType
None
"""
if not len(searched) or not len(others):
raise QueryInputError(
"Decider can't be learned on an empty sample")
# Resolve number of input neurons
self.input_neurons = len(searched[0])
# Input is accepted as a numpy array or as a list
if type(searched) != list:
try:
X = searched.tolist() + others.tolist()
except AttributeError as err:
raise AttributeError("Wrong coordinates input: %s" % err)
elif type(searched) == list:
X = np.array(searched + others)
# Note searched objects as 1 and others as 0
self.y = np.array([1 for i in range(len(searched))] +
[0 for i in range(len(others))])
self.X = X
self.train()
def train(self):
"""Train neuron grid by training sample"""
self.net = FeedForwardNetwork()
inLayer = LinearLayer(self.input_neurons)
hiddenLayer = SigmoidLayer(self.hiden_neurons)
outLayer = LinearLayer(self.OUTPUT_NEURONS)
self.net.addInputModule(inLayer)
self.net.addModule(hiddenLayer)
self.net.addOutputModule(outLayer)
in_to_hidden = FullConnection(inLayer, hiddenLayer)
hidden_to_out = FullConnection(hiddenLayer, outLayer)
self.net.addConnection(in_to_hidden)
self.net.addConnection(hidden_to_out)
self.net.sortModules()
ds = ClassificationDataSet(self.input_neurons,
self.OUTPUT_NEURONS,
nb_classes=3)
for i, coord in enumerate(self.X):
ds.addSample(coord, (self.y[i], ))
trainer = BackpropTrainer(self.net,
dataset=ds,
momentum=0.1,
verbose=True,
weightdecay=0.01)
if self.maxErr:
for i in range(self.maxEpochs):
if trainer.train() < self.maxErr:
print "Desired error reached"
break
else:
trainer.trainUntilConvergence(maxEpochs=self.maxEpochs)
print "Successfully finished"
def evaluate(self, coords):
"""
Find if inspected parameter-space coordinates belongs to searched
object
Parameter
---------
coords : list of lists
Parameter-space coordinates of inspected objects
Returns
------
numpy.array
Probabilities of membership to searched group objects
"""
pred = []
for coord in coords:
p = self.net.activate(coord)[0]
if p < 0:
p = 0
elif p > 1:
p = 1
pred.append(p)
return np.array(pred)
parse_dates=['Month'],
index_col='Month',
date_parser=dateparse)
ts = data['#Passengers']
# Make a new FFN object:
n = FeedForwardNetwork()
# Constructing the input, output and hidden layers:
inLayer = LinearLayer(3)
hiddenLayer = SigmoidLayer(4)
outLayer = LinearLayer(1)
# Adding layers to the network:
n.addInputModule(inLayer)
n.addModule(hiddenLayer)
n.addOutputModule(outLayer)
# determining how neurons should be connected:
in_to_hidden = FullConnection(inLayer, hiddenLayer)
hidden_to_out = FullConnection(hiddenLayer, outLayer)
# Adding connections to the network
n.addConnection(in_to_hidden)
n.addConnection(hidden_to_out)
# Final step that makes our MLP usable
n.sortModules()
# Create samples Train & Validation
training_samples = []
