from PIL import Image
import io
import matplotlib.pyplot as plt
import networkx as nx

def plot_graph(self, G):
    plt.figure(figsize=(3, 2))
    nx.draw(G, with_labels=True, node_color="lightblue", font_weight="bold")
    plt.axis("off")
    plt.tight_layout()

    # Save the figure to a BytesIO buffer
    buf = io.BytesIO()
    plt.savefig(buf, format="png")
    plt.close()

    # Move to the beginning of the buffer before reading
    buf.seek(0)

    # Load the image from the buffer into a PIL Image
    image = Image.open(buf)
    return image