As the kNN algorithm literally "learns by example" it is a case in point for starting to understand supervised machine learning. This chapter will introduce classification while working through the application of kNN to self-driving vehicle road sign recognition.

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Mengenali rambu jalan dengan kNN

Berpikir seperti kNN

Mengeksplorasi himpunan data rambu lalu lintas

Klasifikasi sekumpulan rambu jalan

Bagaimana dengan 'k' pada kNN?

Memahami dampak 'k'

Menguji nilai 'k' lainnya

Melihat bagaimana para tetangga memilih

Persiapan data untuk kNN

Mengapa menormalkan data?

k-Nearest Neighbors (kNN)

Naive Bayes uses principles from the field of statistics to make predictions. This chapter will introduce the basics of Bayesian methods while exploring how to apply these techniques to iPhone-like destination suggestions.

Understanding Bayesian methods

Computing probabilities

Understanding dependent events

A simple Naive Bayes location model

Examining "raw" probabilities

Understanding independence

Understanding NB's "naivety"

Who are you calling naive?

A more sophisticated location model

Preparing for unforeseen circumstances

Understanding the Laplace correction

Applying Naive Bayes to other problems

Handling numeric predictors

Naive Bayes

Logistic regression involves fitting a curve to numeric data to make predictions about binary events. Arguably one of the most widely used machine learning methods, this chapter will provide an overview of the technique while illustrating how to apply it to fundraising data.

Making binary predictions with regression

Building simple logistic regression models

Making a binary prediction

The limitations of accuracy

Model performance tradeoffs

Calculating ROC Curves and AUC

Comparing ROC curves

Dummy variables, missing data, and interactions

Coding categorical features

Handling missing data

Understanding missing value indicators

Building a more sophisticated model

Automatic feature selection

The dangers of stepwise regression

Building a stepwise regression model

Logistic Regression

Classification trees use flowchart-like structures to make decisions. Because humans can readily understand these tree structures, classification trees are useful when transparency is needed, such as in loan approval. We'll use the Lending Club dataset to simulate this scenario.

Making decisions with trees

Building a simple decision tree

Visualizing classification trees

Understanding the tree's decisions

Growing larger classification trees

Why do some branches split?

Creating random test datasets

Building and evaluating a larger tree

Conducting a fair performance evaluation

Tending to classification trees

Preventing overgrown trees

Creating a nicely pruned tree

Why do trees benefit from pruning?

Seeing the forest from the trees

Understanding random forests

Building a random forest model

Classification Trees

Lending Club loan data

Traffic sign image data

Donation data

Brett's location data

Pengantar Machine Learning tingkat pemula ini membahas empat algoritma klasifikasi yang paling umum. Anda akan memperoleh pemahaman dasar tentang cara setiap algoritma menyelesaikan tugas pembelajaran, serta mempelajari fungsi-fungsi R yang diperlukan untuk menerapkan alat ini pada pekerjaan Anda sendiri.

Intermediate R

Dalam kursus ini, Anda akan belajar dasar-dasar pembelajaran mesin untuk klasifikasi.

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