# diagram.py

import matplotlib.pyplot as plt
import tempfile

def show_transformer_diagram():
    fig, ax = plt.subplots(figsize=(6, 4))
    ax.text(0.5, 0.6, 'Input → Embedding → Self-Attention → FFN → Output',
            fontsize=12, ha='center', va='center', wrap=True)
    ax.axis('off')

    with tempfile.NamedTemporaryFile(delete=False, suffix=".png") as tmpfile:
        plt.savefig(tmpfile.name, bbox_inches="tight")
        return tmpfile.name