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# Sample-Efficient Optimization in the Latent Space of Deep Generative Models via Weighted Retraining

NIPS 2020, (2020)

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摘要

Many important problems in science and engineering, such as drug design, involve optimizing an expensive black-box objective function over a complex, high-dimensional, and structured input space. Although machine learning techniques have shown promise in solving such problems, existing approaches substantially lack sample efficiency. We...更多

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简介

- Many important problems in science and engineering can be formulated as optimizing an objective function over an input space.
- Machine learning has shown promising results in many problems that can be framed as optimization, such as conditional image [57, 40] and text [44] generation, molecular and materials design [11, 47], and neural architecture search [10]
- Despite these successes, using machine learning on structured input spaces and with limited data is still an open research area, making the use of machine learning infeasible for many practical applications

重点内容

- Many important problems in science and engineering can be formulated as optimizing an objective function over an input space
- While a large body of work is applicable to the general problem formulated in Section 2, we focus only on the most relevant machine learning literature
- We proposed a method for efficient black-box optimization over high-dimensional, structured input spaces, combining latent space optimization with weighted retraining
- We showed that while being conceptually simple and easy to implement on top of previous methods, weighted retraining significantly boosts their efficiency and performance on challenging real-world optimization problems
- We observed that weighted retraining was less beneficial when used with poorly-performing optimization algorithms
- A further interesting direction would be to consider different classes of weighting functions, those that are robust to noise in the objective function evaluations

结果

- Similar to Fig. 3, the performance can be seen to significantly improve immediately after several of the retraining steps, suggesting that the retraining does incorporate new information into the latent space, as conjectured.

结论

- The authors proposed a method for efficient black-box optimization over high-dimensional, structured input spaces, combining latent space optimization with weighted retraining.
- The authors showed that while being conceptually simple and easy to implement on top of previous methods, weighted retraining significantly boosts their efficiency and performance on challenging real-world optimization problems.
- The latent space of DGMs can be challenging to optimize over, motivating further research to optimize more effectively and/or make the space more amenable to optimization
- Another promising idea is the use of a weighting schedule instead of a fixed weighting, which may allow balancing exploration vs exploitation similar to simulated annealing [58].
- The authors envision weighted retraining to become a core component of model-based optimization methods, further establishing machine learning as a critical tool for advancing science and engineering

- Table1: Comparison of top 3 scores on chemical design task. Baseline results are copied from [<a class="ref-link" id="c65" href="#r65">65</a>]. All our results state the worst of 3 runs (unless otherwise stated), each run being 500 epochs
- Table2: Approximate runtimes of main experiments

相关工作

- While a large body of work is applicable to the general problem formulated in Section 2 (both using and not using machine learning), in this section we focus only on the most relevant machine learning literature. Early formulations of LSO were motivated by scaling Gaussian processes to high dimensional problems with simple linear manifolds, using either random projections [60] or a learned transformation matrix [12]. LSO using DGMs was first applied to chemical design in [13], and further built upon in subsequent papers [21, 29, 9, 24, 5, 15, 35]. It has also been applied to other field such as automatic machine learning [33, 34], and conditional image generation [41, 40]. If the optimization model is a Gaussian process, the DGM can be viewed as a form of “extended kernel”, making LSO conceptually related to deep kernel learning [63, 19].

There are several previous papers that have used ideas closely related to weighted retraining. Perhaps the closest model to ours is the Feedback GAN [17], wherein samples are generated with a GAN and evaluated, discarding samples with low scores. These n samples replace the n oldest points in the training set, after which the GAN is retrained on the new dataset. This can be viewed as a crude version of weighted retraining, only using the weights 0 and 1/N , and assigning weights not based on scores but on novelty. Similarly, in [48] a generative model is trained on drug-like molecules, then repeatedly sampled, evaluating all samples and keeping only those with high scores. The model is then fine-tuned on the high-scoring samples and this process is repeated. Again, this can be viewed as a special case of weighted retraining, where the weights are implicitly defined by the number of fine-tuning epochs. Furthermore, both of these techniques are purely generative and have no optimization component, so we believe that they are fundamentally sample inefficient.

基金

- AT acknowledges funding via a C T Taylor Cambridge International Scholarship
- ED acknowledges funding by the EPSRC and Qualcomm
- This work has been performed using resources provided by the Cambridge Tier-2 system operated by the University of Cambridge Research Computing Service (http://www.hpc.cam.ac.uk) funded by EPSRC Tier-2 capital grant EP/P020259/1

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