[source] # KNN Regressor K Nearest Neighbors (KNN) is a brute-force distance-based learner that locates the k nearest training samples from the training set and averages their labels to make a prediction. K Nearest Neighbors (KNN) is considered a *lazy* learner because it performs most of its computation at inference time. !!! note For a faster spatial tree-accelerated version of KNN, see [KD Neighbors Regressor](kd-neighbors-regressor.md). **Interfaces:** [Estimator](../estimator.md), [Learner](../learner.md), [Online](../online.md), [Persistable](../persistable.md) **Data Type Compatibility:** Depends on distance kernel ## Parameters | # | Name | Default | Type | Description | |---|---|---|---|---| | 1 | k | 5 | int | The number of nearest neighbors to consider when making a prediction. | | 2 | weighted | false | bool | Should we consider the distances of our nearest neighbors when making predictions? | | 3 | kernel | Euclidean | Distance | The distance kernel used to compute the distance between sample points. | ## Example ```php use Rubix\ML\Regressors\KNNRegressor; use Rubix\ML\Kernels\Distance\SafeEuclidean; $estimator = new KNNRegressor(5, false, new SafeEuclidean()); ``` ## Additional Methods This estimator does not have any additional methods.