vastorbit.machine_learning.memmodel.cluster.NearestCentroid¶

class vastorbit.machine_learning.memmodel.cluster.NearestCentroid(clusters: Annotated[list | ndarray, 'Array Like Structure'], classes: Annotated[list | ndarray, 'Array Like Structure'], p: int = 2)¶

InMemoryModel implementation of NearestCentroid algorithm.

Parameters:

clusters (ArrayLike) – list of the model’s cluster centers.
classes (ArrayLike) – Names of the classes.
p (int, optional) – The p corresponding to one of the p-distances.

Variables:

input (Attributes are identical to the)
underscore (parameters, followed by an)
('_').

Examples

Initalization

Import the required module.

from vastorbit.machine_learning.memmodel.cluster import NearestCentroid

A NearestCentroid model is defined by its clusters centroids, classes and the p value. In this example, we will use the following:

clusters = [[0.5, 0.6], [1, 2], [100, 200]]
p = 2
classes = ['class_a', 'class_b', 'class_c']

Let’s create a NearestCentroid model.

model_nc = NearestCentroid(clusters, classes, p)

Create a dataset.

data = [[2, 3]]

Making In-Memory Predictions

Use predict() method to do predictions.

model_nc.predict(data)[0]

Use predict_proba() method to compute the predicted probabilities for each cluster.

model_nc.predict_proba(data)

Use transform() method to compute the distance from each cluster.

model_nc.transform(data)

Deploy SQL Code

Let’s use the following column names:

cnames = ['col1', 'col2']

Use predict_sql() method to get the SQL code needed to deploy the model using its attributes.

model_nc.predict_sql(cnames)

Use predict_proba_sql() method to get the SQL code needed to deploy the model that computes predicted probabilities.

model_nc.predict_proba_sql(cnames)

Use transform_sql() method to get the SQL code needed to deploy the model that computes distance from each cluster.

model_nc.transform_sql(cnames)

Hint

This object can be pickled and used in any in-memory environment, just like scikit-learn models.

__init__(clusters: Annotated[list | ndarray, 'Array Like Structure'], classes: Annotated[list | ndarray, 'Array Like Structure'], p: int = 2) → None¶

Methods

`__init__`(clusters, classes[, p])
`get_attributes`()	Returns the model attributes.
`predict`(X)	Predicts clusters using the input matrix.
`predict_proba`(X)	Predicts the probability of each input to belong to the model clusters.
`predict_proba_sql`(X)	Returns the SQL code needed to deploy the model probabilities.
`predict_sql`(X)	Returns the SQL code needed to deploy the model using its attributes.
`set_attributes`(**kwargs)	Sets the model attributes.
`transform`(X)	Transforms and returns the distance to each cluster.
`transform_sql`(X)	Transforms and returns the SQL distance to each cluster.

Attributes

object_type

Must be overridden in child class