This script draws how Additive Decrease Multiplicative Increase (AIMD) algorithm work in order to understand the algorithm visually.

draw_aimd.py

import numpy as np
import matplotlib.pyplot as plt
from tqdm import tqdm

def main():
    capacity = 100
    throughput = np.array([50., 2.])
    decrease = np.array([2., 2.])
    increase = np.array([3., 3.])

    for i in tqdm(range(100)):
        if capacity < throughput.sum():
            # multiplicative decrease
            throughput = throughput / decrease
        else:
            # additive increase
            throughput = throughput + increase

        plt.figure()
        plt.xlabel("throughput-1")
        plt.ylabel("throughput-2")
        plt.axis([0.0, 1.0, 0.0, 1.0])
        plt.plot(throughput[0]/capacity, throughput[1]/capacity, marker=".", color="red")
        plt.plot([0, 1], [0, 1], color="grey")
        plt.plot([0, 1], [1, 0], color="red")
        plt.savefig(f"{i:03d}.png")
        plt.close()

if __name__ == "__main__":
    main()