languages = ['id', 'uz', 'vi', 'en']
preferred_backends = ['ibm', 'russian', 'ibm', 'ibm']
avg_rewards = [0.84, 0.79, 0.82, 0.85]

colors = ['blue' if b == 'ibm' else 'red' for b in preferred_backends]
plt.bar(languages, avg_rewards, color=colors)
plt.title("Cross-Lingual Backend Preference")
plt.ylabel("Avg Reward")
plt.show()