app.py

from functools import partial

import numpy as np
import matplotlib.pyplot as plt

from sklearn import svm, datasets
from sklearn.model_selection import train_test_split
from sklearn.metrics import ConfusionMatrixDisplay
import gradio as gr


def train_model(normalize):
    # import some data to play with
    iris = datasets.load_iris()
    X = iris.data
    y = iris.target
    class_names = iris.target_names

    # Split the data into a training set and a test set
    X_train, X_test, y_train, y_test = train_test_split(X, y, random_state=0)

    # Run classifier, using a model that is too regularized (C too low) to see
    # the impact on the results
    classifier = svm.SVC(kernel="linear", C=0.01).fit(X_train, y_train)

    np.set_printoptions(precision=2)

    title = (
        "Normalized confusion matrix" if normalize
        else "Confusion matrix, without normalization"
    )

    disp = ConfusionMatrixDisplay.from_estimator(
        classifier,
        X_test,
        y_test,
        display_labels=class_names,
        cmap=plt.cm.Blues,
        normalize='true' if normalize else None,
    )
    disp.ax_.set_title(title)

    return disp.figure_


title = "Confusion matrix"
description = "Example of confusion matrix usage to evaluate the quality of the output of a classifier on the iris data set"
with gr.Blocks() as demo:
    gr.Markdown(f"## {title}")
    gr.Markdown(description)

    normalize = gr.Checkbox(label="Normalize")
    plot = gr.Plot(label="Confusion matrix")

    fn = partial(train_model)
    normalize.change(fn=fn, inputs=[normalize], outputs=plot)


demo.launch(enable_queue=True, debug=True)