课程

Machine Learning with caret in R

中级技能水平

更新时间 2023年11月

This course teaches the big ideas in machine learning like how to build and evaluate predictive models.

免费开始课程

RMachine Learning

4小时

24 视频

88 道练习

6,200 XP

60,659

成就证明

深受数千家公司学习者的喜爱

需要团队培训？

企业版试用

课程描述

Machine learning is the study and application of algorithms that learn from and make predictions on data. From search results to self-driving cars, it has manifested itself in all areas of our lives and is one of the most exciting and fast growing fields of research in the world of data science. This course teaches the big ideas in machine learning: how to build and evaluate predictive models, how to tune them for optimal performance, how to preprocess data for better results, and much more. The popular caret R package, which provides a consistent interface to all of R's most powerful machine learning facilities, is used throughout the course.

先决条件

Introduction to Regression in R

1

Regression Models: Fitting and Evaluating Their Performance

In the first chapter of this course, you'll fit regression models with train() and evaluate their out-of-sample performance using cross-validation and root-mean-square error (RMSE).

Welcome to the course

In-sample RMSE for linear regression

In-sample RMSE for linear regression on diamonds

Out-of-sample error measures

Out-of-sample RMSE for linear regression

Randomly order the data frame

Try an 80/20 split

Predict on test set

Calculate test set RMSE by hand

Comparing out-of-sample RMSE to in-sample RMSE

Cross-validation

Advantage of cross-validation

10-fold cross-validation

5-fold cross-validation

5 x 5-fold cross-validation

Making predictions on new data

2

Classification Models: Fitting and Evaluating Their Performance

3

Tuning Model Parameters to Improve Performance

In this chapter, you will use the train() function to tweak model parameters through cross-validation and grid search.

Random forests and wine

Random forests vs. linear models

Fit a random forest

Explore a wider model space

Advantage of a longer tune length

Try a longer tune length

Custom tuning grids

Advantages of a custom tuning grid

Fit a random forest with custom tuning

Introducing glmnet

Advantage of glmnet

Make a custom trainControl

Fit glmnet with custom trainControl

glmnet with custom tuning grid

Why a custom tuning grid?

glmnet with custom trainControl and tuning

Interpreting glmnet plots

4

Preprocessing Data

In this chapter, you will practice using train() to preprocess data before fitting models, improving your ability to making accurate predictions.

Median imputation

Median imputation vs. omitting rows

Apply median imputation

KNN imputation

Comparing KNN imputation to median imputation

Use KNN imputation

Compare KNN and median imputation

Multiple preprocessing methods

Order of operations

Combining preprocessing methods

Handling low-information predictors

Why remove near zero variance predictors?

Remove near zero variance predictors

preProcess() and nearZeroVar()

Fit model on reduced blood-brain data

Principle components analysis (PCA)

Using PCA as an alternative to nearZeroVar()

5

Selecting Models: A Case Study in Churn Prediction

In the final chapter of this course, you'll learn how to use resamples() to compare multiple models and select (or ensemble) the best one(s).

Reusing a trainControl

Why reuse a trainControl?

Make custom train/test indices

Reintroducing glmnet

glmnet as a baseline model

Fit the baseline model

Reintroducing random forest

Random forest drawback

Random forest with custom trainControl

Comparing models

Matching train/test indices

Create a resamples object

More on resamples

Create a box-and-whisker plot

Create a scatterplot

Ensembling models

Machine Learning with caret in R

课程完成

获得成就证明

将此证书添加到您的 LinkedIn 档案、简历或履历中
在社交媒体和绩效评估中分享立即注册

加入超过19百万学习者，今天就开始Machine Learning with caret in R！

通过 DataCamp for Mobile 提升您的数据技能

随时随地通过我们的移动课程和每日 5 分钟编程挑战提升技能。