1 - Introduction

Introduction to tidymodels

Welcome!

Wi-Fi network name

TODO-ADD-LATER

Wi-Fi password

TODO-ADD-LATER

Venue information

• There are gender neutral bathrooms located on levels 3, 4, 5, 6 & 7

• A meditation/prayer room is located in 503
  (Mon & Tue 7am - 7pm, and Wed 7am - 5pm)

• A lactation room is located in 509
  (Mon & Tue 7am - 7pm, and Wed 7am - 5pm)

Workshop policies

• Please review the posit::conf code of conduct, which applies to all workshops: https://posit.co/code-of-conduct

• CoC site has info on how to report a problem (in person, email, phone)

• Please do not photograph people wearing red lanyards

Who are you?

• You can use the magrittr %>% or base R |> pipe

• You are familiar with functions from dplyr, tidyr, ggplot2

• You have some exposure to basic statistical concepts like linear models and residuals

• You do not need intermediate or expert familiarity with modeling or ML

Who are tidymodels?

• Simon Couch
• Hannah Frick
• Emil Hvitfeldt
• Max Kuhn

+ our TA today, Sara Altman!

Many thanks to Davis Vaughan, Julia Silge, David Robinson, Julie Jung, Alison Hill, and Desirée De Leon for their role in creating these materials!

Asking for help

🟪 “I’m stuck and need help!”

🟩 “I finished the exercise”

Discord

• pos.it/conf-event-portal (login)
• Click on “Join Discord, the virtual networking platform!”
• Browse Channels -> #workshop-tidymodels-intro

👀

👀

Plan for this workshop

• Your data budget
• What makes a model
• Evaluating models
• Tuning models

This workshop will well-prepare folks going on to the Advanced tidymodels workshop, which will cover feature engineering and much more on hyperparameter tuning.

Introduce yourself to your neighbors 👋

Log in to Posit Cloud (free): TODO-ADD-LATER

What is machine learning?

What is machine learning?

What is machine learning? (2024 edition)

In the early 2010s, “Artificial intelligence” (AI) was largely synonymous with what we’ll refer to as “machine learning” in this workshop. In the late 2010s and early 2020s, AI usually referred to deep learning methods. Since the release of ChatGPT in late 2022, “AI” has come to also encompass large language models / generative models.

What is machine learning?

Your turn

How are statistics and machine learning related?

How are they similar? Different?

03:00

the “two cultures”

model first vs. data first

inference vs. prediction

What is tidymodels?

library(tidymodels)
#> ── Attaching packages ──────────────────────────── tidymodels 1.2.0 ──
#> ✔ broom        1.0.6     ✔ rsample      1.2.1
#> ✔ dials        1.3.0     ✔ tibble       3.2.1
#> ✔ dplyr        1.1.4     ✔ tidyr        1.3.1
#> ✔ infer        1.0.7     ✔ tune         1.2.1
#> ✔ modeldata    1.4.0     ✔ workflows    1.1.4
#> ✔ parsnip      1.2.1     ✔ workflowsets 1.1.0
#> ✔ purrr        1.0.2     ✔ yardstick    1.3.1
#> ✔ recipes      1.1.0
#> ── Conflicts ─────────────────────────────── tidymodels_conflicts() ──
#> ✖ purrr::discard() masks scales::discard()
#> ✖ dplyr::filter()  masks stats::filter()
#> ✖ dplyr::lag()     masks stats::lag()
#> ✖ recipes::step()  masks stats::step()
#> • Use tidymodels_prefer() to resolve common conflicts.

The whole game

• Roadmap for today
• Minimal version of predictive modeling process
• Feature engineering and tuning as iterative extensions

The whole game

The whole game

Stress that we are not fitting a model on the entire training set other than for illustrative purposes in deck 2.

The whole game

The whole game

The whole game

The whole game

The whole game

Let’s install some packages

If you are using your own laptop instead of Posit Cloud:

# Install the packages for the workshop
pkgs <- 
  c("bonsai", "Cubist", "doParallel", "earth", "embed", "finetune", 
    "forested", "lightgbm", "lme4", "parallelly", "plumber", "probably", 
    "ranger", "rpart", "rpart.plot", "rules", "splines2", "stacks", 
    "text2vec", "textrecipes", "tidymodels", "vetiver")

install.packages(pkgs)

Our versions

R version 4.4.1 (2024-06-14), Quarto (1.6.1)

package	version
bonsai	0.3.1
broom	1.0.6
Cubist	0.4.4
dials	1.3.0
doParallel	1.0.17
dplyr	1.1.4
earth	5.3.3
embed	1.1.4
finetune	1.2.0
forested	0.1.0
Formula	1.2-5

package	version
ggplot2	3.5.1
lattice	0.22-6
lightgbm	4.3.0
lme4	1.1-35.5
modeldata	1.4.0
parallelly	1.38.0
parsnip	1.2.1
plotmo	3.6.3
plotrix	3.8-4
plumber	1.2.2
probably	1.0.3

package	version
purrr	1.0.2
ranger	0.16.0
recipes	1.1.0
rpart	4.1.23
rpart.plot	3.1.2
rsample	1.2.1
rules	1.0.2
scales	1.3.0
splines2	0.5.2
stacks	1.0.4
text2vec	0.6.4

package	version
textrecipes	1.0.6
tibble	3.2.1
tidymodels	1.2.0
tidyr	1.3.1
tune	1.2.1
vetiver	0.2.5
workflows	1.1.4
workflowsets	1.1.0
yardstick	1.3.1