What does "training a model" refer to in machine learning?

Training a model in machine learning refers to the process of teaching a model using training data. This involves feeding the model a dataset, which includes input features and the corresponding output labels, so the model can learn patterns and relationships inherent in the data. During this training phase, algorithms adjust the model's parameters to minimize the difference between the predicted outputs and the actual labels in the dataset.

Through this iterative process, the model refines its ability to make predictions or classifications on new, unseen data by developing an understanding of the underlying patterns. This is a critical step in creating an effective and functional machine learning model, as the quality of the training process directly impacts the model's performance in real-world applications.

The other options refer to different aspects of the machine learning lifecycle but do not capture the essence of what training a model entails. Deploying a model is about putting it into production; collecting data pertains to data acquisition, and analyzing results focuses on evaluating the model's performance after training has been completed.