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Based on the traditional polynomial regression, neural network is inspired by the "activation" phenomenon of the biological neural network, and the machine learning model is built up by the activation function.In the field of image processing, because of the large amount of data, the problem is that the number of
nnImporttorch.nn.functional as FclassNet (NN. Module):#defines the initialization function of NET, this function defines the basic structure of the neural network def __init__(self):#inherits the initialization method of the parent class, which is to run the nn first. initialization function of moduleSuper (Net,self).__init__() #define convolutional la
, such as the number of hidden nodes, whether the step is fixed, and not discussed here.Prospect:There have been more researches on neural networks, and many new extension algorithms have been produced, such as convolutional neural networks, deep neural networks, and impulsive neur
number of hidden layers, the construction method as described above, the training according to the actual situation of the selection of activation function, forward propagation to obtain cost function and then use the BP algorithm, reverse propagation, gradient decline to reduce the loss value.
Deep neural networks with multiple hidden layers are better able to solve some problems. For example, using a neural
kernel and step operation, There may be the wrong dimension (analogy 2x3 matrix can not be multiplied by the 2x4 matrix, you need to replace the 2x4 matrix into a 3x4 matrix, here is the matrix of the 2x4 to add a row of 0 elements, so that it becomes the matrix of 3x4), the default is 0, preferably set to (kW-1)/ 2, which is the width of the convolution core 1 and then divided by 2. The padh default is PADW, preferably set to (kH-1)/2, which is the high-1 convolution core and then divided by 2
Civilization number" and the Central State organ "youth civilization" title.Smart Apps
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Multilayer large-scale neural network ≈ convolutional Neural Network + LRM (different feature
0-Background
This paper introduces the deep convolution neural network based on residual network, residual Networks (resnets).Theoretically, the more neural network layers, the more complex model functions can be represented. CNN can extract the features of low/mid/high-lev
minimize the cost function to obtain parameters, in the neural network gradient descent algorithm has a special name called the inverse propagation algorithm. in the sample diagram of the neural network above, the input is directly connected to the hidden layer (hiddenlayer), and the output is called the output layer
. Aforge.net Home: http://www.aforgenet.com/Aforge.net Code Download: http://code.google.com/p/aforge/The class diagram for the Aforge.neuro project is as follows:Figure 10. Class diagram of Aforge.neuro class libraryHere are a few of the basic classes in Figure 9:Abstract base class for neuron-neuronsAbstract base class of layer-layer, consisting of multiple neuronsAbstract base class of network-neural
://www.cs.toronto.edu /~ Graves/preprinthistory.
The development of recurrent neural networks.
VanillaRNN-> Enhanced the hidden layer function-> Simple RNN-> GRU-> LSTM-> CW-RNN-> Bidirectional deepening Network-> Bidirectional RNN-> Keep Bidrectional RNN-> Combination of the two: DBLSTMRecurrent Neural Networks, Part 1-Introduction to RNNs http://www.wildml.com/
Next: convolutional neural network for image classification-medium9 ReLU (rectified Linear Units) LayersAfter each convolutional layer, an excitation layer is immediately entered, and an excitation function is called to add the nonlinear factor, and the problem of linear irreducible is rejected. Here we choose the meth
structure (1). Intuition of CNNIn deep learning book, author gives a very interesting insight. He consider convolution and pooling as a infinite strong prior distribution. The distribution indicates, all hidden units share the same weight, derived from certain amount of the input and has Parallel invariant feature.Under Bayesian statistics, prior distribuion is a subjective preference of the model based on experience. and the stronger the prior distribution is, the higher impact it'll has on th
implication of this is that the statistical characteristics of the part of the image are the same as the rest. This also means that the features we learn in this section can also be used in other parts, so we can use the same learning features for all the locations on this image.
More intuitively, when a small piece is randomly selected from a large image, such as 8x8 as a sample, and some features are learned from this small sample, we can apply the feature learned from this 8x8 sample as a de
convolutional neural Networks:step by step
Welcome to Course 4 ' s-A-assignment! In this assignment, you'll implement Convolutional (CONV) and pooling (POOL) layers in NumPy, including both forward pro Pagation and (optionally) backward propagation.
notation:
We assume that you are already familiar with numpy and/or have completed the previous courses. Let ' s g
Deep Learning Neural Network pure C language basic Edition
Today, Deep Learning has become a field of fire, and the performance of Deep Learning Neural Networks (DNN) in the field of computer vision is remarkable. Of course, convolutional neural networks are used in engineer
A course of recurrent neural Network (1)-RNN Introduction
source:http://www.wildml.com/2015/09/recurrent-neural-networks-tutorial-part-1-introduction-to-rnns/
As a popular model, recurrent neural Network (Rnns) has shown great app
, we can directly use the full connection of the neural network, to carry out the follow-up of these 120 neurons, the following specific how to do, as long as the knowledge of multi-layer sensors understand, do not explain.
The above structure, is only a reference, in the real use, each layer feature map needs how many, volume kernel size selection, as well as the pool when the sample rate to how much, and
At present, there are neural networks in all aspects of engineering application, and younger brother is now learning neural network, a little conjecture.Most of the current neural network is to adjust their own weights, so as to learn. Under the structure of a certain
, upload to the second cabinet, the machine identified some characteristics of the dog, very vague, continue to upload to the third cabinet, the other part of the dog features identified, the image is gradually clear up, so continue, like "winding" (convolution) action, has been "winding" to the tenth cabinet, the dog's face revealed the "truth", recognition task completed. Ah, it turns out to be the most popular image and speech recognition technology in the world today:
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