遅延学習
Lazy learningは 機械学習 where the model does not attempt to generalize from the 訓練データ until a query is made. This approach contrasts with eager learning algorithms, which build a model during the training phase and make predictions based on the generalized model.
In lazy learning, the system stores the training data and waits until a request for a prediction is received. When a prediction is needed, the algorithm uses the stored instances to make a decision. This method is particularly useful in scenarios where the data is complex and diverse, potentially leading to better predictions without the bias of an oversimplified model.
レイジーラーニングの一般的な例には次のものがあります：
- クエリが k-Nearest Neighbors This algorithm classifies a new instance based on the majority class of its ‘k’ nearest training instances in the feature space.
- （k-NN）： ケースベース推論 This approach solves new problems based on the solutions of similar past problems.
Lazy learning has its advantages and disadvantages. One major advantage is that it can be more flexible and can adapt to 新しいデータ without needing to retrain a model. However, it can also be computationally expensive at the time of prediction, especially if the dataset is large, as it requires the algorithm to consider all stored instances to make accurate predictions.
（CBR）： 全体として、lazy learningは強力な機械 that prioritizes immediate data retrieval and analysis over upfront model construction, making it suitable for specific applications where data patterns may frequently change.