K-means

Load Iris dataset and create clusters.

Import

from __future__ import annotations

from gemseo.api import configure_logger
from gemseo.api import load_dataset
from gemseo.core.dataset import Dataset
from gemseo.mlearning.api import create_clustering_model
from numpy import array

configure_logger()

<RootLogger root (INFO)>

Create dataset

We import the Iris benchmark dataset through the API.

iris = load_dataset("IrisDataset")

# Extract inputs as a new dataset
data = iris.get_data_by_group(iris.PARAMETER_GROUP)
variables = iris.get_names(iris.PARAMETER_GROUP)
print(variables)

dataset = Dataset("sepal_and_petal")
dataset.set_from_array(data, variables)

['sepal_length', 'sepal_width', 'petal_length', 'petal_width']

Create clustering model

We know that there are three classes of Iris plants. We will thus try to identify three clusters.

model = create_clustering_model("KMeans", data=dataset, n_clusters=3)
model.learn()
print(model)

KMeans(n_clusters=3, random_state=0, var_names=None)
   based on the scikit-learn library
   built from 150 learning samples

Predict output

Once it is built, we can use it for prediction.

input_value = {
    "sepal_length": array([4.5]),
    "sepal_width": array([3.0]),
    "petal_length": array([1.0]),
    "petal_width": array([0.2]),
}
output_value = model.predict(input_value)
print(output_value)

0

Plot clusters

Show cluster labels

dataset.add_variable(
    "km_specy", model.labels.reshape((-1, 1)), group="labels", cache_as_input=False
)
dataset.plot("ScatterMatrix", kde=True, classifier="km_specy")

/home/docs/checkouts/readthedocs.org/user_builds/gemseo/envs/4.2.0/lib/python3.9/site-packages/gemseo/post/dataset/scatter_plot_matrix.py:135: UserWarning: To output multiple subplots, the figure containing the passed axes is being cleared.
  sub_axes = scatter_matrix(

<gemseo.post.dataset.scatter_plot_matrix.ScatterMatrix object at 0x7fccd31d73d0>