matrix factorization machine learning

Customer Churn "Loss rate" is a business term that describes the customer's departure or stop payment of a product or service rate. This is a key figure in many organizations, as it is usually more expensive to get new customers than to retain the existing costs (in some cases, 5 to 20 times times the cost). Therefore, it is invaluable to understand that it is valuable to maintain customer engagement because it is a reasonable basis for developing retention policies and implementing operational

implementation.I explain this process as machine learning equals Matrix + statistics + optimization + algorithm . First, when the data is defined as an abstract representation, it often forms a matrix or a graph, which can be understood as a matrix. Statistics is the main t

Reprint Please specify source: http://www.cnblogs.com/ymingjingr/p/4271742.htmlDirectory machine Learning Cornerstone Note When you can use machine learning (1) Machine learning Cornerstone Note 2--When you can use

1. Decision Tree　　applicable conditions: The data of different class boundary is non-linear, and by continuously dividing the feature space into a matrix to simulate. There is a certain correlation between features. The number of feature values should be similar, because the information gain is biased towards more numerical characteristics.　　Advantages: 1. Intuitive decision-making rules; 2. Nonlinear characteristics can be handled; 3. The interaction

First, the machine learning algorithm engineers need to master the skills Machine Learning algorithm engineers need to master skills including (1) Basic data structure and algorithm tree and correlation algorithm graph and correlation algorithm hash table and correlation algorithm

I. Introduction of supervised learningThe supervised machine learning problem is nothing more than "Minimizeyour error while regularizing your parameters", which is to minimize errors while the parameters are being parameterized. The minimization error is to let our model fit our training data, and the rule parameter is to prevent our model from overfitting our training data. What a minimalist philosophy! B

The concept of extreme learning machineElm is a new fast learning algorithm, for TOW layer neural network, elm can randomly initialize input weights and biases and get corresponding output weights.For a single-hidden-layer neural network, suppose there are n arbitrary samples, where。 For a single hidden layer neural network with a hidden layer node, it can be expressed asWhere, for the activation function,

difficult to solve, through a certain free scaling to optimize the number of B and W;SVM dual problem variables is the number of training data N, Solve B and W by finding the support vector and the corresponding alpha.So that's enough for you? Remember when we first extended the dual problem, we wanted to solve SVM but computational complexity did not want to be related to D_telta, because D_telta could be infinite. It seems that the dual problem of SVM is only related to N, in fact, D_telta is

http://sourceforge.net/projects/numpy/files/download the corresponding version of the NumPy, everywhere, find a not python2.7Use Pip, please.Pip Install NumPyDownload finished, the hint does not install C + +, meaning is also to install VS2008, but installed is VS2012, had to download a VC for Pythonhttp://www.microsoft.com/en-us/download/confirmation.aspx?id=44266Re-pip, wait for the most of the day, the final count is successfulInput command introduced NumPyFrom numpy Import *Operation:InputRa

1. Common steps 2. Chinese participle 1 This is relative to the English text affective analysis, Chinese unique preprocessing. 2 Common methods: Based on the dictionary, rule-based, Statistical, based on the word annotation, based on artificial intelligence. 3 Common tools: Hit-language cloud, Northeastern University Niutrans statistical Machine translation system, the Chinese Academy of Sciences Zhang Huaping Dr. Ictclas, Posen technology, stutterin

Operation of matrices and images(1) Cvand functionIts structurevoid Cvand ( //Src1 and SRC2 by Pixel point "bitwise AND operation" Const cvarr* src1,//First Matrix const cvarr* src2,//second matrix cvarr* dst,//result Matrix Const Cvarr * Mask = null;//matrix by the line pixel point and the "switch");Program Examples#

) for in H: Print(i) for in H.flat: print(i)iterating over a multidimensional array is the first axis :if to perform operations on the elements in each array, we can use the flat property, which is an iterator to the array element :Np.flatten () returns an array that is collapsed into one dimension. However, the function can only be applied to the NumPy object, that is , an array or mat, the normal List of lists is not possible. A = Np.array ([[Up], [3, 4], [5, 6]])print(A.flatten

general, multiplication does not satisfy the exchange law: $ \ Matrix {A} \ times \ matrix {B} \ not = \ matrix {B} \ times \ matrix {A} $Special Matrix $ \ Matrix {I }=\ matrix {I _ {

"%Metrics.confusion_matrix (expected, predicted)) Images_and_predictions= List (Zip (digits.images[n_samples/2:], predicted)) forIndex, (image, prediction)inchEnumerate (images_and_predictions[:4]): Plt.subplot (2, 4, index + 5) Plt.axis ('off') plt.imshow (image, CMap=plt.cm.gray_r, interpolation='Nearest') Plt.title ('Prediction:%i'%prediction) Plt.show ()Output Result:Classification report forClassifier SVC (c=1.0, cache_size=200, Class_weight=none, coef0=0.0, degree=3, Gamma=0.001, kernel='R

. 7.5 910.5 . 13.5]]# n Powers of each element of the matrix: n=2mymatrix1 = Mat ([[[1,2,3],[4,5,6],[7,8,9]])print power (mymatrix1,2 1 4 9] [[49 6481]]# matrix multiplied by matrix mymatrix1 = Mat ([[1,2,3],[4,5,6],[7,8,9 = Mat ([[[1],[2],[3]])print mymatrix1*mymatrix2 output: [[[][+][50]]# Transpose of the matrix