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Identify the missing word(s) in the following sentence within the context of Microsoft Azure. Context: Simple models with small datasets can often be fit in a single step, whereas larger datasets and more complex models require iterative training—repeatedly using the model with training data, comparing outputs with expected labels, and adjusting until an optimal fit is achieved. Hyperparameters are values that modify how a model is trained during these iterative loops. Preprocessing refers to transformations applied to the data before it is passed to the model. The most common preprocessing step is to [____]. Question: Which word(s) correctly complete the sentence?