Перейти к основному содержимому

Course

Linear Classifiers in Python

СреднийУровень мастерства

Обновлено 10.2023

In this course you will learn the details of linear classifiers like logistic regression and SVM.

Начать Курс Бесплатно

PythonMachine Learning4 ч13 videos44 Exercises3,200 XP65,652Свидетельство о достижениях

Создайте бесплатный аккаунт

или

Продолжая, вы принимаете наши Условия использования, нашу Политику конфиденциальности и подтверждаете, что ваши данные хранятся в США.

Пользуется популярностью среди обучающихся в тысячах компаний.

Обучение двух или более человек?

Попробуйте DataCamp for Business

Описание курса

In this course you'll learn all about using linear classifiers, specifically logistic regression and support vector machines, with scikit-learn. Once you've learned how to apply these methods, you'll dive into the ideas behind them and find out what really makes them tick. At the end of this course you'll know how to train, test, and tune these linear classifiers in Python. You'll also have a conceptual foundation for understanding many other machine learning algorithms.

Предварительные требования

Supervised Learning with scikit-learn

1

Applying logistic regression and SVM

In this chapter you will learn the basics of applying logistic regression and support vector machines (SVMs) to classification problems. You'll use the scikit-learn library to fit classification models to real data.

scikit-learn refresher

KNN classification

Comparing models

Overfitting

Applying logistic regression and SVM

Running LogisticRegression and SVC

Sentiment analysis for movie reviews

Linear classifiers

Which decision boundary is linear?

Visualizing decision boundaries

Начало Главы

2

Loss functions

In this chapter you will discover the conceptual framework behind logistic regression and SVMs. This will let you delve deeper into the inner workings of these models.

Linear classifiers: the coefficients

How models make predictions

Changing the model coefficients

What is a loss function?

The 0-1 loss

Minimizing a loss function

Loss function diagrams

Classification loss functions

Comparing the logistic and hinge losses

Implementing logistic regression

Начало Главы

3

Logistic regression

In this chapter you will delve into the details of logistic regression. You'll learn all about regularization and how to interpret model output.

Logistic regression and regularization

Regularized logistic regression

Logistic regression and feature selection

Identifying the most positive and negative words

Logistic regression and probabilities

Getting class probabilities

Regularization and probabilities

Visualizing easy and difficult examples

Multi-class logistic regression

Counting the coefficients

Fitting multi-class logistic regression

Visualizing multi-class logistic regression

One-vs-rest SVM

Начало Главы

4

Support Vector Machines

In this chapter you will learn all about the details of support vector machines. You'll learn about tuning hyperparameters for these models and using kernels to fit non-linear decision boundaries.

Support vectors

Support vector definition

Effect of removing examples

Kernel SVMs

GridSearchCV warm-up

Jointly tuning gamma and C with GridSearchCV

Comparing logistic regression and SVM (and beyond)

An advantage of SVMs

An advantage of logistic regression

Using SGDClassifier

Начало Главы

Linear Classifiers in Python

Курс
завершен

Получите свидетельство о достижениях

Добавьте эти данные в свой профиль LinkedIn, резюме или CV.
Поделитесь этим в социальных сетях и в своем отчете об оценке эффективности работы.Запишитесь Прямо Сейчас

Присоединяйтесь 19 миллионов учащихся и начните Linear Classifiers in Python сегодня!

Создайте бесплатный аккаунт

или

Продолжая, вы принимаете наши Условия использования, нашу Политику конфиденциальности и подтверждаете, что ваши данные хранятся в США.

Развивайте свои навыки работы с данными с помощью DataCamp для мобильных устройств.

Успевайте в обучении на ходу с помощью наших мобильных курсов и ежедневных 5-минутных заданий по программированию.