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Neural Networks for Machine Learning Cheat Sheet by

Neural Networks for Machine Learning - showing neural networks types, applications, weight updates, python source code and links.

Neural Networks Types and Main Features

Feedfo­rward neural network
connec­tions between nodes do not have a cycle
Multilayer perceptron (MLP)
has at least three layers of nodes
Reccurent neural network (RNN)
connec­tions between units have a directed cycle
Self-O­rga­nising Maps (SOM)
convert input data to low dimens­ional space
Deep Belief Network (DBN)
has connec­tions between layers but not within layer
Convol­utional Neural Network (CNN)
has one or more convol­utional layers and then followed by one or more fully connected layers
Generative Advers­arial Networks (GAN)
system of two neural nets, contesting with each other
Spiking Neural Netorks (SNN)
time inform­ation is processed in the form of spikes and there is more than one synapse between neurons
Wavelet neural network
use wavelet function as activation function in the neuron
Wavelet convol­utional neural network
combine wavelet transform and CNN
Long short-term memory (LSTM)
type of RNN, model for the short-term memory which can last for a long period of time
 

Building Neural Network with Keras and Python

from keras.models import Sequential
model = Sequential()
from keras.layers import Dense

model.add(Dense(units=64, activation='relu', input_dim=100))
model.add(Dense(units=10, activation='softmax'))

model.compile(loss='categorical_crossentropy',
              optimizer='sgd',
              metrics=['accuracy'])
model.compile(loss=keras.losses.categorical_crossentropy,
              optimizer=keras.optimizers.SGD(lr=0.01, momentum=0.9, nesterov=True))

model.fit(x_train, y_train, epochs=5, batch_size=32)

model.train_on_batch(x_batch, y_batch)
loss_and_metrics = model.evaluate(x_test, y_test, batch_size=128)
classes = model.predict(x_test, batch_size=128)

Data Prepar­ation for Input to Neural Network

from sklearn import preprocessing

def normalize_data(m, XData):
    if m == "":
        m="scaling-no"
    if m == "scaling-no":
        return XData
    if m == "StandardScaler":
        std_scale = preprocessing.StandardScaler().fit(XData)
        XData_new = std_scale.transform(XData)
    if m == "MinMaxScaler":
        minmax_scale = preprocessing.MinMaxScaler().fit(XData)
        XData_new = minmax_scale.transform(XData)

    return XData_new

Cheat Sheets about Python and Machine Learning

 

Neural Network Applic­ations and Most Used Networks

Image classi­fic­ation
CNN
Image recogn­ition
CNN
Time series prediction
RNN, LSTM
Text generation
RNN, LSTM
Classi­fic­ation
MLP
Visual­ization
SOM

Neural Net Weight Update Methods

Adam
based on adaptive estimates of lower order moments
AdaGrad
Adagrad is an adaptive learning rate method
RMSProp
adaptive learning rate method, modifi­cation of Adagrad method
SGD
Stochastic gradient descent
AdaDelta
modifi­cation of Adagrad to reduce its aggres­sive, monoto­nically decreasing learning rate
Newton method
second order method, is not used in deep learning
Momentum
method that helps accelerate SGD in the relevant direction
Nesterov accele­rated gradient
evaluate the gradient at next position instead of current

Links

                           

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