Data voorbereiden voor modelleren met h2o

Om modellen te trainen met h2o, moet je de gegevens voorbereiden volgens de specifieke eisen van h2o. Hier doorloop je een veelgebruikte workflow voor gegevensvoorbereiding in h2o.

De bibliotheek h2o is al voor je geladen, net als het object seeds_train_data.

Dit hoofdstuk gebruikt functies die wat tijd kunnen kosten om uit te voeren, dus schrik niet als het iets langer duurt dan normaal om je antwoord te verzenden. In zeldzame gevallen kun je een serverfout krijgen. Ververs in dat geval gewoon de pagina.

Deze oefening maakt deel uit van de cursus

Hyperparameterafstelling in R

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Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

# Initialise h2o cluster
h2o.init()

# Convert data to h2o frame
seeds_train_data_hf <- ___(___)

Code bewerken en uitvoeren

Deze oefening maakt deel uit van de cursus

Hyperparameterafstelling in R

SkillTag.level.advancedSkillTag.label

4.8+

Begin de cursus gratis

Why do we use the strange word "hyperparameter"? What makes it hyper? Here, you will understand what model parameters are, and why they are different from hyperparameters in machine learning. You will then see why we would want to tune them and how the default setting of caret automatically includes hyperparameter tuning.

Exercise 1: Parameters vs hyperparameters Exercise 2: Model parameters vs. hyperparameters Exercise 3: Hyperparameters in linear models Exercise 4: What are the coefficients?Exercise 5: Recap of machine learning basics Exercise 6: Machine learning with caret Exercise 7: Resampling schemes Exercise 8: Hyperparameter tuning in caret Exercise 9: Hyperparameters in Stochastic Gradient Boosting Exercise 10: Changing the number of hyperparameters to tune Exercise 11: Tune hyperparameters manually

In this chapter, you will learn how to tune hyperparameters with a Cartesian grid. Then, you will implement faster and more efficient approaches. You will use Random Search and adaptive resampling to tune the parameter grid, in a way that concentrates on values in the neighborhood of the optimal settings.

Exercise 1: Hyperparameter tuning in caret Exercise 2: Finding hyperparameters Exercise 3: Cartesian grid search in caret Exercise 4: Plot hyperparameter model output Exercise 5: Grid vs. Random Search Exercise 6: Grid search with range of hyperparameters Exercise 7: Find train() option for random search Exercise 8: Random search with caret Exercise 9: Adaptive resampling Exercise 10: Advantages of Adaptive Resampling Exercise 11: Adaptive Resampling with caret

Here, you will use another package for machine learning that has very convenient hyperparameter tuning functions. You will define a Cartesian grid or perform Random Search, as well as advanced techniques. You will also learn different ways to plot and evaluate models with different hyperparameters.

Exercise 1: Machine learning with mlr Exercise 2: Machine Learning with mlr Exercise 3: Modeling with mlr Exercise 4: Grid and random search with mlr Exercise 5: Random search with mlr Exercise 6: Perform hyperparameter tuning with mlr Exercise 7: Evaluating hyperparameters with mlr Exercise 8: Why to evaluate tuning?Exercise 9: Evaluating hyperparameter tuning results Exercise 10: Advanced tuning with mlr Exercise 11: Define advanced tuning controls Exercise 12: Define aggregated measures Exercise 13: Setting hyperparameters

In this final chapter, you will use h2o, another package for machine learning with very convenient hyperparameter tuning functions. You will use it to train different models and define a Cartesian grid. Then, You will implement a Random Search use stopping criteria. Finally, you will learn AutoML, an h2o interface which allows for very fast and convenient model and hyperparameter tuning with just one function.

Exercise 1: Machine learning met h2o Exercise 2: Data voorbereiden voor modelleren met h2o

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Exercise 3: Modelleren met h2o Exercise 4: Grid- en random search met h2o Exercise 5: Grid search met h2o Exercise 6: Random search met h2o Exercise 7: Stopcriteria Exercise 8: Automatische Machine Learning met H2O Exercise 9: AutoML in h2o Exercise 10: Scores in de leaderboard Exercise 11: h2o-modellen extraheren en prestaties evalueren Exercise 12: Afronding