Propose a method to estimate the absolute accuracy of both models (MA and MB) using importance sampling, given that you only have access to their ratio and limited computational resources. Explain any tradeoffs involved.

Implement simple importance sampling with an appropriate proposal distribution to estimate the partition functions individually. Since we know the ratio of two partition functions, we can use it as a reference point to normalize the estimated probabilities. This approach has the advantage of not requiring additional training data but may have higher computational costs due to Monte Carlo simulations.