Tuning 2.0: Advanced Optimization Techniques Webinar

1. SigOpt. Conﬁdential. Tuning 2.0 Advanced Optimization Techniques Scott Clark, PhD — Founder and CEO Tuesday, September 10, 2019

2. SigOpt. Conﬁdential. Accelerate and amplify the impact of modelers everywhere

3. SigOpt. Confidential. Differentiated Models Tailored Models 10,000x Analytics 2.0 Models 100x 1x Modelers by Segment Value per Model Enterprise AI Goals: Differentiate Products Generate Revenue Requirements: Modelers with Expertise Best-in-Class Solutions

4. SigOpt. Confidential. Your firewall Training Data AI, ML, DL, Simulation Model Model Evaluation or Backtest Testing Data New Configurations Objective Metric Better Results EXPERIMENT INSIGHTS Track, organize, analyze and reproduce any model ENTERPRISE PLATFORM Built to fit any stack and scale with your needs OPTIMIZATION ENGINE Explore and exploit with a variety of techniques RESTAPI Configuration Parameters or Hyperparameters Your data and models stay private Iterative, automated optimization Integrates with any modeling stack

5. SigOpt. Conﬁdential. $300B+ in assets under management Current SigOpt algorithmic trading customers represent $500B+ in market capitalization Current SigOpt enterprise customers across six industries represent

6. SigOpt. Conﬁdential. Data Engineering Feature Engineering Metric Deﬁnition Model Search Model Training Model Tuning Model Evaluation Model Deployment

7. SigOpt. Conﬁdential. Data Engineering Feature Engineering Metric Deﬁnition Model Search Model Training Model Tuning Model Evaluation Model Deployment Hyperparameter Optimization (including long training cycles)

8. SigOpt. Conﬁdential. Data Engineering Feature Engineering Metric Deﬁnition Model Search Model Training Model Tuning Model Evaluation Model Deployment Early Stopping Convergence Monitoring

9. SigOpt. Conﬁdential. Data Engineering Feature Engineering Metric Deﬁnition Model Search Model Training Model Tuning Model Evaluation Model Deployment HPO with Conditional Parameters

10. SigOpt. Conﬁdential. Data Engineering Feature Engineering Metric Deﬁnition Model Search Model Training Model Tuning Model Evaluation Model Deployment Tuning Transformations

11. SigOpt. Conﬁdential. Data Engineering Feature Engineering Metric Deﬁnition Model Search Model Training Model Tuning Model Evaluation Model Deployment Multimetric HPO

12. SigOpt. Conﬁdential. Data Engineering Feature Engineering Metric Deﬁnition Model Search Model Training Model Tuning Model Evaluation Model Deployment Re-tuning

13. SigOpt. Conﬁdential. Data Engineering Feature Engineering Metric Deﬁnition Model Search Model Training Model Tuning Model Evaluation Model Deployment Tuning Transformations Balancing Metrics Tuning Architecture Early Stopping HPO (long training cycles) Re-tuning Opportunity Iteratively tune at all stages of the modeling lifecycle

14. SigOpt. Conﬁdential. Beneﬁts Learn fast, fail fast Give yourself the best chance at finding good use cases while avoiding false negatives Connect outputs to outcomes Define, select and iterate on your metrics with end-to-end evaluation Find the global maximum Early non-optimized decisions in the process limit your ability to maximize performance Boost productivity Automate modeling tasks so modelers spend more time applying their expertise

15. SigOpt. Confidential. Data Engineering Feature Engineering Metric Definition Model Search Model Training Model Tuning Model Evaluation Model Deployment Tuning Transformations Balancing Metrics Tuning Architecture Early Stopping HPO (long training cycles) Re-tuning Focus for today Metric Definition, Model Search, Long Training Cycles

16. SigOpt. Conﬁdential. Techniques 1. Metric deﬁnition: multimetric optimization 2. Model search: conditional parameters 3. Long training cycles: multitask optimization

17. SigOpt. Conﬁdential. Metric deﬁnition with multimetric optimization 1

18. SigOpt. Confidential. How it works: Multimetric optimization (with thresholds) ● Define two metrics instead of one ● Optimize against both metrics automatically and simultaneously ● Set thresholds on each individual metric to reflect business or modeling needs ● Compare a Pareto frontier of best model configurations that balance these two metrics ● Relevant docs ● Relevant blog post

19. SigOpt. Conﬁdential. Potential applications of multimetric optimization Balance Competing Objectives Deﬁne and Select Metrics Connect Metrics to Outcomes https://sigopt.com/blog/intro-to-multicriteria -optimization/ https://sigopt.com/blog/multimetric-updates- in-the-experiment-insights-dashboard/ https://sigopt.com/blog/metric-thresholds-a -new-feature-to-supercharge-multimetric- optimization/

20. Use Case: Balancing Speed & Accuracy in Deep Learning Multimetric Use Case 1 ● Category: Time Series ● Task: Sequence Classification ● Model: CNN ● Data: Diatom Images ● Analysis: Accuracy-Time Tradeoff ● Result: Similar accuracy, 33% the inference time Multimetric Use Case 2 ● Category: NLP ● Task: Sentiment Analysis ● Model: CNN ● Data: Rotten Tomatoes ● Analysis: Accuracy-Time Tradeoff ● Result: ~2% in accuracy versus 50% of training time Learn more https://devblogs.nvidia.com/sigopt-deep-learning- hyperparameter-optimization/

21. SigOpt. Confidential. Experiment Design for Sequence Classification Data ● Diatom Images ● Source: UCR Time Series Classification Model ● Convolutional Neural Network ● Source: Wang et al. (paper, code) ● Tensorflow via Keras Metrics ● Inference Time ● Accuracy HPO Methods (Implemented via SigOpt) ● Random Search ● Bayesian Optimization Note: Experiment code available here

22. SigOpt. Conﬁdential. Process: Tune variety of parameters, maximize metrics Network Architecture Stochastic Gradient Descent

23. SigOpt. Conﬁdential. Result: Bayesian outperforms random search ● Both methods were executed via the SigOpt API ● Bayesian optimization required 90% fewer training runs than random search ● Bayesian optimization found 85.7% of the combined Pareto frontier of optimal model conﬁgurations—almost 6x as many choices 10x random

24. SigOpt. Conﬁdential. Result: Minimal accuracy loss for 66% inference gain Maximize accuracy Minimize inference time Balance Both

25. SigOpt. Conﬁdential. Model search with conditional parameters2

26. SigOpt. Conﬁdential. How it works: Conditional parameters Take into account the conditionality of certain parameter types in the optimization process ● Establish conditionality between various parameters ● Use this conditionality to improve the Bayesian optimization process ● Boost results from the hyperparameter optimization process ● Example: Architecture parameters for deep learning models ● Example: Parameter types for SGD variants (to the right) ● Relevant docs

27. Use Case: Eﬀective and Eﬃcient NLP Optimization Use Case ● Category: NLP ● Task: Question Answering ● Model: MemN2N ● Data: bAbI ● Analysis: Performance benchmark ● Result: 4.84% gain, 30% the cost Learn more https://devblogs.nvidia.com/optimizing-end-to-end-memory- networks-using-sigopt-gpus/

28. SigOpt. Conﬁdential. Design: Question answering data and memory networks Data Model Sources: Facebook AI Research (FAIR) bAbI dataset: https://research.fb.com/downloads/babi/ Sukhbaatar et al.: https://arxiv.org/abs/1503.08895

29. SigOpt. Conﬁdential. Hyperparameter Optimization Experiment Setup Comparison of Bayesian Optimization and Random Search Standard Parameters Conditional Parameters

30. SigOpt. Conﬁdential. Result: Signiﬁcant boost in consistency, accuracy Comparison across random search versus Bayesian optimization with conditionals

31. SigOpt. Conﬁdential. Result: Highly cost eﬃcient accuracy gains Comparison across random search versus Bayesian optimization with conditionals SigOpt is 18.5x as efficient

32. SigOpt. Conﬁdential. Long training cycles with multitask optimization in parallel 3

33. SigOpt. Conﬁdential.33 How it works: Multitask Optimization Partial Full ● Introduce a variety of cheap and expensive tasks in a hyperparameter optimization experiment ● Use cheaper tasks earlier (explore) in the tuning process to inform more expensive tasks later (exploit) ● In the process, reduce the full time required to tune an expensive model ● Relevant docs Sources: Matthias Poloczek, Jialei Wang, Peter I. Frazier: https://arxiv.org/abs/1603.00389 Aaron Klein, Frank Hutter, et al.: https://arxiv.org/abs/1605.07079

34. SigOpt. Confidential. How it works: Combine multitask with parallelization Your firewall New Configurations Objective Metric Better Results EXPERIMENT INSIGHTS Track, organize, analyze and reproduce any model ENTERPRISE PLATFORM Built to fit any stack and scale with your needs OPTIMIZATION ENGINE Explore and exploit with a variety of techniques RESTAPI Configuration Parameters or Hyperparameters WorkerWorker Worker Worker

35. Use Case: Image Classification on a Budget Use Case ● Category: Computer Vision ● Task: Image Classification ● Model: CNN ● Data: Stanford Cars ● Analysis: Architecture Comparison ● Result: 2.4% accuracy gain for much cheaper model Learn more https://mlconf.com/blog/insights-for-building-high-performing- image-classification-models/

36. SigOpt. Conﬁdential. Data: Cars image classiﬁcation 36 Stanford CARS Dataset 16,185 images, 196 classes Labels: Car, Make, Year Source: Stanford CARS Dataset: https://ai.stanford.edu/~jkrause/cars/car_dataset.html

37. SigOpt. Conﬁdential. Architecture: Classifying images of cars using ResNet 37 Convolutions Classiﬁcation ResNet Input Acura TLX 2015 Output Label Sources: Kaiming He, Xiangyu Zhang, Shaoqing Ren, Jian Sun: https://arxiv.org/abs/1512.03385

38. SigOpt. Conﬁdential. Architecture Comparison Training Setup Comparison Experiment design scenarios 38 Baseline SigOpt Multitask ResNet 50 Scenario 1a Pre-Train on Imagenet Tune Fully Connected Layer Scenario 1b Optimize Hyperparameters to Tune the Fully Connected Layer ResNet 18 Scenario 2a Fine Tune Full Network Scenario 2b Optimize Hyperparameters to Fine Tune the Full Network

39. SigOpt. Conﬁdential. Training setup comparison ImageNet Pretrained Convolutional Layers Fully Connected Layer ImageNet Pretrained Convolutional Layers Fully Connected Layer Input Convolutional Features Classification Input Convolutional Features Classification Fine Tuning Feature Extractor Tuning Tuning

40. SigOpt. Conﬁdential. Hyperparameter setup 40 Hyperparameter Lower Bound Upper Bound Log Learning Rate 1.2e-4 1.0 Learning Rate Scheduler 0 0.99 Batch Size (powers of 2) 16 256 Nesterov False True Log Weight Decay 1.2e-5 1.0 Momentum 0 0.9 Scheduler Step 1 20

41. SigOpt. Confidential. Fine-tuning the smaller network significantly outperforms feature extraction on a bigger network Results: Optimizing and tuning the full network outperforms 41 Multitask optimization drives significant performance gains +3.92% +1.58%

42. SigOpt. Conﬁdential.42 Insight: Multitask eﬃciency at the hyperparameter level Example: Learning rate accuracy and values by cost of task over time Progression of observations over time Accuracy and value for each observation Parameter importance analysis

43. SigOpt. Conﬁdential. Insight: Parallelization further accelerates wall-clock time 43 928 total hours to optimize ResNet 18 220 observations per experiment 20 p2.xlarge AWS ec2 instances 45 hour actual wall-clock time

44. SigOpt. Confidential. Implication: Fine-tuning significantly outperforms Cost Breakdown for Multitask Optimization Cost efficiency Feature Extractor ResNet 50 Fine-Tuning ResNet 18 Hours per training 4.08 4.2 Observations 220 220 Number of Runs 1 1 Total compute hours 898 924 Cost per GPU-hour $0.90 $0.90 % Improvement 1.58% 3.92% Total compute cost $808 $832 cost ($) per % improvement $509 $20 Similar Compute Cost Fine-Tuning Significantly More Efficient and Effective Similar Wall-Clock Time

45. SigOpt. Confidential. Implication: Multiple benefits from multitask 45 Tuning ResNet-18 Cost efficiency Multitask Bayesian Random Hours per training 4.2 4.2 4.2 Observations 220 646 646 Number of Runs 1 1 20 Total compute hours 924 2,713 54,264 Cost per GPU-hour $0.90 $0.90 $0.90 Total compute cost $832 $2,442 $48,838 Time to optimize Multitask Bayesian Random Total compute hours 924 2,713 54,264 # of Machines 20 20 20 Wall-clock time (hrs) 46 136 2,713 1.7% the cost of random search to achieve similar performance 58x faster wall-clock time to optimize with multitask versus random search

46. SigOpt. Conﬁdential. Techniques 1. Metric deﬁnition: multimetric optimization Read the blog here. 2. Model search: conditional parameters Read the blog here. 3. Long training cycles: multitask optimization Read the blog here.

47. SigOpt. Conﬁdential. Try our solution Sign up at sigopt.com/try-it today. Register with code: 1SFSPON25 https://sanfrancisco.theaisummit.com September 25-26, 2019 Register with code: SIGOPT20 https://twimlcon.com/ October 1-2, 2019 Download eBook https://twimlai.com/announcing-our- ai-platforms-series-and-ebooks/

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