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4 Model type
Recall that the goal of a machine-learning system is typically to estimate or generalize,
based on data provided. Below, we examine the role of model-making in machine learning.
4.1 No model
In some simple cases, in response to queries, we can generate predictions directly from
the training data, without the construction of any intermediate model. For example, in
regression or classification, we might generate an answer to a new query by averaging
answers to recent queries, as in the nearest neighbor method.
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