LSTM unit.for the gradient explosion problem, it is usually a relatively simple strategy, such as Gradient clipping: in one iteration, the sum of the squares of each weighted gradient is greater than a certain threshold, and to avoid the weight matrix being updated too quickly, a scaling factor (the threshold divided by the sum of squares) is obtained, multiplying all the gradients by this factor. Resources:[1] The lecture notes on neural networks a
Here is the [1] derivation of the BP algorithm (backpropagation) steps to tidy up, memo Use. [1] the direct use of the matrix differential notation is deduced, the whole process is very concise. And there is a very big advantage of this matrix form is that it is very convenient to implement the programming Control.But its practical scalar calculation deduction also has certain advantages, for example, can clearly know that a weight is affected by who.Marking Conventions:$L $: The number of layer
Two types of classification: binary Multi-ClassThe following are two types of classification problems (one is binary classification, one is Multi-Class classification)If it is a binary classification classification problem, then the output layer has only one node (1 output unit, SL =1), hθ (x) is a real number,k=1 (K represents the node number in the output layer).Multi-Class Classification (with K categories): hθ (x) is a k-dimensional vector, SL =k, generally k>=3 (because if there are two cl
Artificial intelligence is not mysterious, will be a little subtraction enough.
For neurons, when nerves are stimulated, the neurotransmitter is released to the next neuron, and the amount of neurotransmitters released by the next neuron is different for different levels of stimulation, so mimic this process to build a neural network:
When entering a data x, simulate input an outside stimulus, after processing, the output of the result is f (x), the F
The neural network can be seen in two ways, one is the set of layers, the array of layers, and the other is the set of neurons, which is the graph composed of neuron.In a neuron-based implementation, you need to define two classes of Neuron, WeightAn instance of the neuron class is equivalent to a vertex,weight consisting of a linked list equivalent to an adjacency table and a inverse adjacency table.In the layer-based implementation, each layer corre
gradient descent algorithm to a normalized neural networkThe partial derivative of the normalized loss function is obtained:You can see the paranoid gradient drop. Learning rules do not change:And the weight of learning rules has become:This is the same as normal gradient descent learning rules, which adds a factor to readjust the weight of W. This adjustment is sometimes called weight decay .Then, the normalized learning rule for the weight of the r
+ b.tC. C = a.t + bD. C = a.t + b.t9. Please consider the following code: C results? (If you are unsure, run this lookup in Python at any time). AA = Np.random.randn (3, 3= NP.RANDOM.RANDN (3, 1= a*bA. This will trigger the broadcast mechanism, so B is copied three times, becomes (3,3), * represents the matrix corresponding element multiplied, so the size of C will be (3, 3)B. This will trigger the broadcast mechanism, so B is duplicated three times, becomes (3, 3), * represents matrix multipli
Recently in the study of Artificial neural network (Artificial neural netwroks), make notes, organize ideas
Discrete single output perceptron algorithm, the legendary MP
Two-valued Network: The value of the independent variable and its function, the value of the vector component only takes 0 and 1 functions, vectors
Weight vector: w= (W1,W2,W3.....WN)
Input vector: x= (X1,X2,X3.....XN)
Training Sample
1 Introduction
Remember when I first contacted RoboCup 2 years ago, I heard from my seniors that Ann (artificial neural network), this thing can be magical, he can learn to do some problems well enough to deal with. Just like us, we can learn new knowledge by studying.
But for 2 years, I've always wanted to learn about Ann, but I haven't been successful. The main reason for this is that the introduction of this technology in our domestic tutorials i
Http://blog.sina.com.cn/s/blog_98238f850102w7ik.htmlAll the current Ann neural network algorithm Daquan(2016-01-20 10:34:17)reproduced
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Overview1 BP Neural network1.1 Main functions1.2 Advantages and Limitations2 RBF (radial basis function) neural network2.1 Main functions2.2 Advantages and Limitations3 Sensor
Content Summary:(1) introduce the basic principle of neural network(2) Aforge.net method of realizing Feedforward neural network(3) the method of Matlab to realize feedforward neural network---cited Examples In this paper, fisher's iris data set is used as a test data set of neural network Program. The Iris data set ca
Why use convolution?
In traditional neural networks, such as Multilayer perceptron (MLP), whose input is usually a feature vector, requires manual design features, and then the values of these features to form a feature vector, in the past decades of experience, the characteristics of artificial found is not how to use, sometimes more, sometimes less, Sometimes the selected features do not work at all (the truly functional feature is inside the vast u
All the current Ann neural network algorithm DaquanOverview1 BP Neural network1.1 Main functions1.2 Advantages and Limitations2 RBF (radial basis function) neural network2.1 Main functions2.2 Advantages and Limitations3 Sensor Neural Network3.1 Main functions3.2 Advantages and Limitations4 Linear
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AI technology in game programming.
.(Serialization II)
3Digital neural networks (the digital version)
We have seen that the biological brain is composed of many neural cells. Similarly, the artificial neural network ANN that simulates the brain is composed of many artificial neural cells (Artificial Ne
Deep learning--the artificial neural network and the upsurge of researchHu XiaolinThe artificial neural network originates from the last century 40 's, to today already 70 years old. Like a person's life, has experienced the rise and fall, has had the splendor, has had the dim, has had the noisy, has been deserted. Generally speaking, the past 20 years of artificial neu
A reference to the artificial neural network should think of three basic knowledge points: One is the neuron model, the other is the neural network structure, and the third is the learning algorithm. There are many kinds of neural networks, but the classification basis cannot escape from the above basic knowledge points. So in learning if you can just hold the ab
Transfer from http://www.cnblogs.com/heaad/archive/2011/03/07/1976443.htmlThe main contents of this paper include: (1) Introduce the basic principle of neural network, (2) Aforge.net the method of realizing Feedforward neural Network, (3) Matlab to realize the method of Feedforward neural network.Section 0 section, introduction example In this paper, Fisher's Iri
absrtact : This paper will analyze the basic principle of deep neural network to recognize graphic images in detail. For convolutional neural Networks, this paper will discuss in detail the principle and function of each layer in the network in the image recognition, such as the convolution layer (convolutional layers), the sampling layer (pooling layer), the fully connected layer (hidden layers), the outpu
Introduction to machine learning--talking about neural network
This article transferred from: http://tieba.baidu.com/p/3013551686?pid=49703036815see_lz=1#Personal feel is very full, especially suitable for contact with neural network novice.
Start with the question of regression (Regression). I have seen a lot of people say that if you want to achieve strong AI, you have to let the machine learn to observe
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