most common machine learning algorithms

This paper mainly includes the realization of common machine learning algorithms, in which the mathematical derivation, principle and parallel implementation will give the link. Machine Learning (machines

; Rsold =r " *R; for i=1:length (b) Ap =a*P; Alpha =rsold/(p " *ap); X=x+alpha*P; R =r-alpha*AP; Rsnew =r " *R; if sqrt (rsnew) break ; End P =r+ (rsnew/rsold) *P; Rsold =rsnew; EndEnd Back to top of 4. Heuristic Optimization methodHeuristic method refers to the method that people take when they solve the problem and find it according to the rule of experience. It is characterized by the use of past experience in the solution of problems, th

Introduction to several common optimization algorithms for machine learning789491451. Gradient Descent method (Gradient descent) 2. Newton's method and Quasi-Newton method (Newton ' s method Quasi-Newton Methods) 3. Conjugate gradient method (conjugate Gradient) 4. Heuristic Optimization Method 5. Solving constrained optimization problems--Lagrange multiplier me

exception, that is, the meaning of expectation. E-step is also the process of acquiring expectations. Based on the existing model, the results of each observation data input into the model are calculated. This process is called the expected value calculation process, the E process.The full name of M-step:m is maximization, which means maximizing. M-step is also the process of maximizing expectations. After you get a round of expectations, recalculate the model parameters to maximize the expecte

data to determine the classification, so there is a certain error rate in the classification decision.Application:(1) Sentiment analysis(2) Document classification(3) Junk Mail FilterSix, Aprior frequent item excavationBasic principle:(1) If a collection of items occurs frequently, all subsets of the item collection also appear frequently.(2) If the item collection does not appear frequently, all the superset of the item collection does not appear frequently.Advantages:(1) Easy to implement, an

, activating the back of the nerve layer, the final output layer of the nodes on the node on behalf of a variety of fractions, example to get the classification result of Class 1The same input is transferred to different nodes and the results are different because the respective nodes have different weights and biasThis is forward propagation.10. MarkovVideoMarkov Chains is made up of state and transitionsChestnuts, according to the phrase ' The quick brown fox jumps over the lazy dog ', to get

conjugate gradient method is not only one of the most useful methods to solve the large scale linear equations,is also one of the most effective algorithms for solving large-scale nonlinear optimization. In various optimization algorithms, the conjugate gradient method is very important. Its advantage is that the required storage capacity is small, has step convergence, high stability, and does not require

Recently learned about Python implementation of common machine learning algorithms on GitHubDirectory First, linear regression 1. Cost function2. Gradient Descent algorithm3. Normalization of the mean value4. Final running result5, using the linear model in the Scikit-learn library to implement S

the curve is above the Curve.The common convex functions are: exponential function f (x) =ax;a>1 Negative logarithm function? logax;a>1,x>0 Two-time function of opening up The decision of the convex function:1, If F is a first-order, x, y in any data domain satisfies F (y) ≥f (x) +f′ (x) (y?x)2. If f is a differentiable guide,Examples of convex optimization applications SVM: which consists of max|w| Turn min (12?| W|2)

, example to get the classification result of Class 1The same input is transferred to different nodes and the results are different because the respective nodes have different weights and biasThis is forward propagation.10. MarkovVideoMarkov Chains is made up of state and transitionsChestnuts, according to the phrase ' The quick brown fox jumps over the lazy dog ', to get Markov chainStep, set each word to a state, and then calculate the probability of transitions between statesThis is the proba

paper is usually European-style distance, Pearson coefficient or cosine similarity.Assuming that a matrix A is established, the M*n matrix, the rows are all users, n is all items, each element of the matrix represents the user's rating of the item, then the item-based or user-based recommendation is to calculate the similarity of all columns or all rows. In real life, this matrix is very sparse.Topic: Recommend users to buy TOPN itemsThe Matrix C is a m*n matrix, each row represents each user,

nodes on the node on behalf of a variety of fractions, example to get the classification result of Class 1The same input is transferred to different nodes and the results are different because the respective nodes have different weights and biasThis is forward propagation.10. MarkovVideoMarkov Chains is made up of state and transitionsChestnuts, according to the phrase ' The quick brown fox jumps over the lazy dog ', to get Markov chainStep, set each word to a state, and then calculate the prob