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Model hyperparameters are free parameters of a model which control different aspects of the learning process of your model. Hyperparameter search is the process of finding the model hyperparameters which result in the most performant model. Spell lets you automate hyperparameter searches with the spell hyper command. For an interactive, runnable tutorial on hyperparameter search refer to our blog post: "An introduction to hyperparameter search with CIFAR10". The spell hyper command kicks off your hyperparameter search.