and master the knowledge of gambling. There are two kinds of phenomena in the nature of , one is called the decisive phenomenon, and the characteristics of this kind of phenomenon are: under a set of conditions, the result is completely decided, either fully affirmed or totally negative, there is no other possibility. The decisive phenomenon is actually the phenomenon that can predict the result beforehand. There is also a class of phenomena called
) Call The kNN algorithm in scikit-learn.
# Call The knn algorithm package of scikit from sklearn. neighbors import into def knnClassify (trainData, trainLabel, testData): knnClf = encrypt () # default: k = 5, defined by yourself: KNeighborsClassifier (n_neighbors = 10) knnClf. fit (trainData, ravel (trainLabel) testLabel = knnClf. predict (testData) saveResult(testLabel,'sklearn_knn_Result.csv ') return testLabel
The kNN algorithm package can set its
common learning task, and we can predict Y based on a new sample of the input variable X. We do not know the appearance or form of function f. If we know it, we will use it directly, without using machine learning algorithms to learn from the data.The most common machine learning algorithm is to learn to map y = f (x) to predict the y of the new X. This is called predictive modeling or predictive analytics
weaknesses of the system, and then inspire you to improve it.The recommended method for building a learning algorithm is:1. Starting with a simple, fast-to-implement algorithm, this algorithm is implemented with cross-validation set data testing2. Draw the learning curve to decide whether to add more data, or more features, or other options3. Error Analysis: Manual Check Cross-validation sets the example of the prediction error in our algorithm to see if these instances have some systematic tre
to% input layer to 1th layer weights for j = 1:3 for k = 1:num_in W{1} (j,k) = W{1} (j,k)
+ inta*delta1 (j) *data_simple (k);
End ended end% gets the output of each node output ends percent prediction Classification result predict = zeros (1,length (test_data)); For i =1:length (test_data)% forward compute the output value of each layer node Data_simple = test_data (i,1:end-1); Net1 = data_simple*w{1} ';% first layer of hidden layer input
methods and models)
Step: 1. Convert business problems into data mining Problems
In Alice in Wonderland, Alice said, "I don't care where to go ". The cat said, "Well, it's okay for you to go any way ". Alice added: As long as I can reach somewhere. Cat: "Oh, you can do this, as long as you can walk for a long time ."
The cat may have another meaning. If there is no definite destination, it cannot be determined whether you have been walking for a long enough time.
The goal of a data mining proje
calculated based on the values of some variables and then classified based on the results. (The calculation result is finally classified into several discrete values, for example, dividing a group of data into two types: "may respond" or "may not respond ). Classification is often used to solve the filtering problem of mailing objects as described above. We will use data that has been classified based on historical experience to study their features, and then
vector (Word2vec), the more similar the vector of the word will be closer
New words can get shared parameters from context
Word2vec
Map each word to a list of vectors (that is, a embeddings), start at random, and use this embedding to predict
Context is the neighbor of the vector list
The goal is to place the words in the window adjacent to each other, that is, to predict the neig
Chemical mapping software ChemDraw is a software that can be used in the field of biochemistry, Norfloxacin is a commonly used enteritis drug, is a common research object in the field of biochemistry, in the course of research needs to predict its NMR spectra. This time, if you use the latest Chemoffice 15 component--chemdraw Professional 15 to predict the NMR spectra of organic compounds such as norfloxaci
investigate.7.2 Error AnalysisThe recommended Practices for solving machine learning problems are:
Start with a simple algorithm the can implement quickly. Implement it and test it on your cross-validation data.
Plot Learning curves to decide if more data, more features, etc. is likely to help.
The Error analysis:manually examine the examples (in cross validation set) is your algorithm made errors on. See if you spot any systematic trend in what type of examples it is making er
Directory what is support vector machine (SVM) feature selection using the ID3 algorithm to generate decision trees using the C4.5 algorithm to generate decision trees using the CART algorithm to generate decision tree pre-pruning and post-pruning applications: What to do if you encounter continuous and missing values? Multi-variable decision tree Python code (Sklearn Library)
What is support vector machine (SVM)
Cited examplesThe existing training set is as follows,
1.c4.5 algorithm2. K-mean-value clustering algorithm3. Support Vector Machine4. Apriori Correlation algorithm5.EM maximum expectation algorithm expectation maximization6. PageRank algorithm7. AdaBoost Iterative algorithm8. KNN algorithm9. Naive Bayesian algorithm10, CART classification algorithm.1.c4.5 algorithmWhat does C4.5 do? C4.5 constructs a classifier in the form of a decision tree. To do this, you need to give a collection of data that has been categorized by C4.5 expression content.Wait
Share some of the less-fitting and over-fitting in linear regression.In order to solve the situation of under-fitting, it is often necessary to improve the linear number of times to set up a model fitting curve, too many times will lead to overfitting, the number of times will not fit.When the higher function is established, the training data can be generated by using the polynomial feature generator.Let's show you the whole process.Simulates a process of predicting the price of a cake from an u
TCP connection is initialized in two parts A and B, the NAT device will assume that they trust each other and allow the connection between them.Figure 1 is an example of the goal of allowing A and B (respectively, after Nata and NATB) to establish a TCP connection.We discussed a variety of TCP connectivity scenarios in a particular NAT device environment.If our situation is as follows:1, can predict NA port, can
enterprise managers and more efforts of data mining personnel. Based on the experience of previous data mining projects, the author tries to explain some confusing problems.
1. Application of the results
Problem: The results of data mining are partly submitted in the form of probabilistic data, which is the most likely place for criticism. Business executives may ask, I want you to make predictions about my customer churn, why can't you tell me exactly which clients are going to lose next mon
, image labeling (images captioning), and so on, can refer to the second blog I recommend.
The specific success of the application is lstm, it is an upgraded version of RNN, it better deal with long-sequence dependency problem, he solved the problem of gradient disappear. LSTM (Long short term Memories) long sequence dependency problem
RNN Excellent processing sequence problem is that it connects the previous information for the current task, such as using the previous movie screen information t
complement the algorithm, the previous article we have introduced, when we face a bunch of data and to be based on a certain purpose to the data mining, feel that we do not know or choose the appropriate algorithm in DM, At this point we apply the Microsoft Neural Network analysis algorithm, and when we analyze the rules with the Microsoft Neural Network analysis algorithm, we use the Microsoft Linear regression analysis algorithm to predict the resu
function (Gauss),-t=3,sigmod kernel function, a new version of the-t=4, is expected to calculate the core (not yet);-G is the parameter coefficient of the kernel function,-C is the penalty factor coefficient,-V is the number of cross-validation, the default is 5, This parameter in Svmtrain write out use and do not write out when not used, the model came out of something different, do not write when, model for a structure, is a model, can be brought into the svmpredict directly use, write out wh
model. Let's talk about algorithms and learning strategies.
Procedure:
In step 2, how to update and match is determined by the learning strategy. Here, our loss function uses the total distance from all misclassified points to the superplane, that is, the set of misclassified points. According to the minimum gradient descent method ,,. This is all the algorithms of the sensor machine learning model. The following uses python to implement the sensor machine.0x03 code implementation
First, define
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