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Implementing Industrial Inference Pipelines for Smart Manufacturing

Using an NVIDIA Triton Inference Server, industrial manufacturer Sansera improved quality control and documentation through a custom AI pipeline.

Implementing quality control and assurance methodology in manufacturing processes and quality management systems ensures that end products meet customer requirements and satisfaction. Surface defect detection systems can use image data to perform inspections and classifications for delivering high-quality products. With advancements in AI, real-time defect detection is streamlined and automated using sensors and pretrained AI models for replicable quality control.

Sweden-based company Sansera—a producer of connecting rods for diesel engines—collaborated with AI company Aixia to implement an automated, deep learning defect detection system in their production process using computer vision.

Found in buses, trucks, and ships, every rod in the manufacturing production process must be high quality, consistent, reliable, and documented. It is imperative that the high-resolution, visual inspection system detects and classifies defects in real time.  

To help Sansera reach its manufacturing process quality control goals, Aixia developed and deployed a rod inspection and detection pipeline at Sansera’s production site. At the heart of the pipeline, is an NVIDIA Triton Inference Server deployed on the NVIDIA Jetson edge AI platform and data center servers. It is implemented on an x86 server with NVIDIA A10 GPUs for inference.

Using a quality vision inspection system, robots lift and display connecting rods to a set of AI-enabled cameras. The cameras take multiple photos to capture imprints and serial numbers, which are sent through AI-based computer vision models for inspection in a controlled lighting environment. The evaluations are performed in sequence and the results provide quality control documentation. Several deep learning inferences are performed per camera view.

A robot picks up the rod for three cameras mounted left, right, and bottom.
Figure 1. Automatic inspection of a connecting rod. A robot picks up the rod for three cameras mounted left, right, and bottom.

Each connecting rod is inspected and documented properly before release. The job of this inference workflow is to detect the imprints, inspect their quality, and provide necessary details for the product documentation. The workflow is deployed and optimized on an NVIDIA Triton Inference Server, using different frameworks and consolidates quality use cases in a streamlined fashion. 

Several models, in both pre-and post-processing, are consolidated within one server instance.

Framework of NVIDIA Triton inference server with here the pre-and post-processing of the image.
Figure 2. Scalable deployment of NVIDIA Triton inference server with here the pre-and post-processing of the image.

Using NVIDIA Triton, Aixia deploys optimized versions of the pretrained models, in the data center using high-performance GPUs, or on the edge close to the data using the Jetson edge AI platform. 

Learn more about how NVIDIA Triton and NVIDIA Jetson can be used to run models at the edge.

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Misc

Better Together: Accelerating AI Model Development with Lexset Synthetic Data and NVIDIA TAO

Train highly accurate computer vision models with Lexset synthetic data and the NVIDIA TAO Toolkit.

To develop an accurate computer vision AI application, you need massive amounts of high-quality data. With a traditional dataset, you might spend months collecting images, getting annotations, and cleaning data. When it’s done, you could find edge cases and need more data, starting the cycle all over again.

For years, this cycle has held back AI, especially in computer vision. Lexset builds tools that enable you to generate data to solve this bottleneck. Powerful new workflows with training data can be developed and iterated as part of the AI training cycle.

Lexset’s Seahaven platform generates fully annotated datasets, including photorealistic RGB images, semantic segmentation, and depth maps, in a matter of minutes. Iteration to improve your model’s accuracy is fast and effective. It’s not a months-long process to find data for unusual events or rare conditions anymore. Just quickly adjust your configuration and generate new data to make your model better than ever.

The synthetic data generated from Seahaven can be used to fine-tune and customize pretrained models from the NVIDIA TAO Toolkit. The TAO Toolkit, a low-code AI model development solution, abstracts the complexity of AI frameworks and enables you to create custom, production-ready models for your specific use case with transfer learning.

Reduce time and increase accuracy significantly by using both Seahaven and TAO Toolkit in creating an initial dataset. Most importantly, you can use synthetic data to quickly adapt a model to changing conditions and increased complexity.

Solution overview

For this experiment, you take a simple use case and build a computer vision model capable of finding and differentiating between a common hardware item, such as screws. You start with a simple background and introduce more complexity to show how adaptable synthetic data is to changing conditions.

We created a dataset containing images with annotations of the four screws and used the TAO Toolkit Object Detection model to get started. We used Faster R-CNN, RetinaNet, and YOLOv3.

In this post, I cover the steps required to run this sample dataset, which you can download, through Faster R-CNN. To run RetinaNet or YOLOv3, the steps are the same and are in the provided Jupyter notebook.

I also share how the Lexset synthetic data can be used in concert with model training to quickly address accuracy issues that may arise as use cases become more complex.

Picture of synthetic screws randomly placed on the floor. Picture of semantic segmentation between the screws and the floor. Picture of all the screws with 2D bounding boxes around each of them.
Figure 1. Synthetic screws generated by Lexset in RGB, Semantic Segmentation, and with 2D Bounding boxes.

To make your own dataset to use with TAO Toolkit, follow the instructions at Using Seahaven and the Seahaven documentation.

To reproduce the results described, follow these main steps:

  • Use a pretrained ResNet-18 model and train a ResNet-18 Faster RCNN model on Lexset’s four screws synthetic dataset.
  • Use the best trained weights on the synthetic dataset and fine-tune them with 10% of the real-world four-screw dataset.
  • Evaluate the best trained and fine-tuned weights on the real screws validation dataset.
  • Run inference on the trained model.

Prerequisites

NVIDIA TAO Toolkit requires an NVIDIA GPU (for example, A100) and driver to use their Docker container, so you must have one to proceed.

You also need at least 16 GBs physical RAM, 50 GB of available memory, and an 8-Core. We tested on Python 3.6.9 and used Ubuntu 18.04. TAO Toolkit requires NVIDIA driver 455.xx or later.

Download the dataset

Download the dataset from the Google Drive folder (link also provided in the notebook), which contains all the zip files for synthetic and real images of screws.

●	synthetic_dataset_without_complex_phase1.zip
●	synthetic_dataset_with_complex_phase2.zip
●	real_dataset.zip

Extract the dataset inside synthetic_dataset_without_complex_phase1.zip and real_dataset.zip into the /data directory. The dataset directory structure should look like the following:

├── real_test
├── real_train
├── synthetic_test
└── synthetic_train

TAO Toolkit supports datasets in KITTI format, and the provided dataset is already in that format. To verify it further, see KITTI file format.

Environment setup

Create a new virtual environment using virtualenvwrapper. For more information, see Virtual Environments in the Python Guide.

When you have followed the instructions to install virtualenv and virtualenvwrapper, set the Python version:

echo "export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python3" >> ~/.bashrc
source ~/.bashrc
mkvirtualenv launcher -p /usr/bin/python3

Clone the repository:

git clone https://github.com/Lexset/NVIDIA-TAO-Toolkit---Synthetic-Data.git
cd tao-screws

To install the required dependencies for the environment, install the requirements.txt file:

pip3 install -r requirements.txt

Start the Jupyter notebook:

cd faster_rcnn
jupyter notebook --ip 0.0.0.0 --allow-root --port 8888

Setting up TAO Toolkit mounts

The notebook has a script to generate a ~/.tao_mounts.json file.

{
      "Mounts": [
        {
            "source": "ABSOLUTE_PATH_TO_PROJECT_NETWORK_DIRECTORY",
            "destination": "/workspace/tao-experiments"
        },
        {
         "source": "ABSOLUTE_PATH_TO_PROJECT_NETWORK_SPECS_DIRECTORY",
            "destination": "/workspace/tao-experiments/faster_rcnn/specs"
        }
    ],
     "Envs": [
         {
             "variable": "CUDA_VISIBLE_DEVICES",
             "value": "0"
         }
     ],
     "DockerOptions": {
         "shm_size": "16G",
         "ulimits": {
             "memlock": -1,
             "stack": 67108864
         },
         "user": "1001:1001"
     }
 }

The code example generates the global ~/.tao_mounts.json file at the Ubuntu home directory.

Processing the dataset into TFRecords

When the dataset is downloaded and placed in a data directory, the next step is to convert the KITTI files into the TFRecord format used by NVIDIA TAO Toolkit. Generate TFrecords for both the synthetic and real datasets. This code example from the Jupyter notebook generates TFrecords:

#KITTI trainval
!tao faster_rcnn dataset_convert --gpu_index $GPU_INDEX -d $SPECS_DIR/faster_rcnn_tfrecords_kitti_synth_train.txt 
                    -o $DATA_DOWNLOAD_DIR/tfrecords/kitti_synthetic_train/kitti_synthetic_train

!tao faster_rcnn dataset_convert --gpu_index $GPU_INDEX -d $SPECS_DIR/faster_rcnn_tfrecords_kitti_synth_test.txt 
                    -o $DATA_DOWNLOAD_DIR/tfrecords/kitti_synthetic_test/kitti_synthetic_test

The same conversion is applied on the real dataset by the next code example in the notebook.

Download the ResNet-18 convolutional backbone

On the setup of NGC CLI locally, download the convolutional backbone, ResNet-18.

!ngc registry model list nvidia/tao/pretrained_object_detection*

Run a benchmark experiment using synthetic data

The following commands start the training on synthetic data and all the logs are saved on out_resnet18_synth_amp16.log file. To see the logs, open the file or refresh the tab if the file was already opened.

!tao faster_rcnn train --gpu_index $GPU_INDEX -e $SPECS_DIR/default_spec_resnet18_synth_train.txt --use_amp > out_resnet18_synth_amp16.log

Alternatively, you can use the tail command to see the last few lines of the logs.

!tail -f ./out_resnet18_synth_amp16.log

After the training is completed on the synthetic dataset, you can evaluate the synthetically trained model on 10% synthetic validation dataset using the following commands:

!tao faster_rcnn evaluate --gpu_index $GPU_INDEX -e $SPECS_DIR/default_spec_resnet18_synth_train.txt

You see the results like the following.

mAP@0.5 = 0.9986

You also see the individual mAP scores for each class.

Fine-tuning the synthetic-trained model with real data

Now, use the best trained weights from synthetic training and perform the fine-tuning on 10% of the real-world screw dataset. The /train folder inside real_train is already at a 10% split and you can start the fine-tuning using the following commands:

!tao faster_rcnn train --gpu_index $GPU_INDEX -e $SPECS_DIR/default_spec_resnet18_real_train.txt --use_amp > out_resnet18_synth_fine_tune_10_amp16.log

Results: Improvements on 10% of the real data

Per epoch, the mAP score looks like the following data:

mAP@0.5 = 0.9408              
mAP@0.5 = 0.9714              
mAP@0.5 = 0.9732              
mAP@0.5 = 0.9781              
mAP@0.5 = 0.9745              
mAP@0.5 = 0.9780              
mAP@0.5 = 0.9815              
mAP@0.5 = 0.9820              
mAP@0.5 = 0.9803              
mAP@0.5 = 0.9796              
mAP@0.5 = 0.9810              
mAP@0.5 = 0.9817

Fine tuning on just 10% of the real-world screw dataset improves the results quickly and the mAP score above 98%. The features learned from the synthetic dataset helped during the fine-tuning on just 10% of the real-world screw dataset.

Add a complex background in the synthetic screws validation dataset

To further validate the synthetically trained model, we added 300 more images to the complex background dataset. As the initial synthetic dataset was not taken with a complex background, the mean average precision drops significantly.

Just like the real world, as the use case becomes more complex, the accuracy suffers. When validated on images containing more complex or adversarial backgrounds, the mAP score dropped from around 98% to 83.5%. 

Retrain the synthetic dataset with complex backgrounds

This is where synthetic data really shines. To mitigate the loss in mAP when validated on complex images, I generated additional images with more complex backgrounds to add to the training data. I just adjusted the backgrounds so that the new training data set was ready in a manner of seconds. After being introduced, the new dataset boosted performance by an incredible 10-12% with no additional changes.

The dataset with the complex backgrounds is inside the zip file synthetic_dataset_with_complex.zip mentioned earlier. Extract this file and replace the folders inside the /data directory with the same names to have an updated synthetic dataset with a complex background.

Average Mean Precision:
mAP= 94.97%

Increase in mAP score: 11.47%

Specifically, the accuracy of the system with complex backgrounds rose as much as 11.47%, to 94.97%, after just a few minutes of work.

Conclusion

The results showed just how effective and quick it is to iterate with synthetic data and the TAO Toolkit. Using Lexset’s Seahaven, you can generate new data in a matter of minutes and use it to resolve the accuracy issues encountered with introduced complex backgrounds.

The importance of the synthetic dataset is now clear, as the performance of the fine-tuned model on the 90% validation dataset for real-world screw data is extremely good. Use a synthetic dataset for initial feature learning when you have less actual or real-world data. Synthetic datasets can save significant time and cost while producing superior results.

I believe this is the future of computer vision development, where data production occurs in tandem with model iteration. This will give greater controls to the user and enabling you to build the best systems the world has ever seen.

Get started by downloading the Jupyter notebook and sample dataset.

To create your own data, sign up for an account with Lexset.

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Misc

The Future of Computer Vision

Demonstrate your computer vision expertise by mastering cloud services, AutoML, and Transformer architectures.

Computer vision is a rapidly growing field in research and applications. Advances in computer vision research are now more directly and immediately applicable to the commercial world.

AI developers are implementing computer vision solutions that identify and classify objects and even react to them in real time. Image classification, face detection, pose estimation, and optical flow are some of the typical tasks. Computer vision engineers are a subset of deep learning (DL) or machine learning (ML) engineers that program computer vision algorithms to accomplish these tasks.

The structure of DL algorithms lend themselves well to solving computer vision problems. The architectural characteristics of convolutional neural networks (CNNs) enable the detection and extraction of spatial patterns and features present in visual data.

The field of computer vision is rapidly transforming industries like automotive, healthcare, and robotics, and it can be difficult to stay up-to-date on the latest discoveries, trends, and advancements. This post highlights the core technologies that are influencing and will continue to shape the future of computer vision development in 2022 and beyond:

  • Cloud computing services that help scale DL solutions.
  • Automated ML (AutoML) solutions that reduce the repetitive work required in a standard ML pipeline.
  • Transformer architectures developed by researchers that optimize computer vision tasks.
  • Mobile devices incorporating computer vision technology.

Cloud computing

Cloud computing provides data storage, application servers, networks, and other computer system infrastructure to individuals or businesses over the internet. Cloud computing solutions offer quick, cost-effective, and scalable on-demand resources.

Storage and high processing power are required for most ML solutions. The early-phase development of dataset management (aggregation, cleaning, and wrangling) often requires cloud computing resources for storage or access to solution applications like BigQuery, Hadoop, or BigTable.

Image of data center servers.
Figure 1. Interconnected data center, representing the need for cloud computing and cloud services
(Photo by Taylor Vick on Unsplash)

Recently, there has been a notable increase in devices and systems enabled with computer vision capabilities, such as pose estimation for gait analysis, face recognition for smartphones, and lane detection in autonomous vehicles.

The demand for cloud storage is growing rapidly, and it is projected that this industry will be valued at $390.33B—five times the market’s current value in 2021. The increased market size will lead to an increase in the use of inbound data to train ML models. This correlates directly to larger data storage capacity requirements and increasingly more powerful compute resources.

GPU availability has accelerated computer vision solutions. However, GPUs alone aren’t always enough to provide the scalability and uptime required by these applications, especially when servicing thousands or even millions of consumers. Cloud computing provides the needed resources to startup and supplement existing on-premises infrastructure gaps.

Cloud computing platforms, including Amazon Web Services (AWS), Google Cloud Platform (GCP), and Microsoft Azure, provide end-to-end solutions to core components of the ML and data science project pipeline, including data aggregation, model implementation, deployment, and monitoring. For computer vision developers designing vision systems, it’s important to be aware of these major cloud service providers their strengths, and how they can be configured to meet specific and complex pipeline needs.

Computer vision at scale requires cloud service integration

The following are examples of NVIDIA services that support typical computer vision systems.

The NGC Catalog of pretrained DL models reduces the complexity of model training and implementation.

DL scripts provide ready-made customizable pipelines. The robust model deployment solution automates delivery to end users.

NVIDIA Triton Inference Server enables the deployment of models from frameworks such as TensorFlow and PyTorch on any GPU– or CPU-based infrastructure. Triton Inference Server provides scalability of models across various platforms, including cloud, edge, and embedded devices.

The NVIDIA partnership with cloud service providers such as AWS enables the deployment of computer vision-based assets, so computer vision engineers can focus more on model performance and optimization.

Businesses reduce costs and optimize strategies wherever feasible. Cloud computing and cloud service providers accomplish both by providing billed solutions based on usage and scaling based on demand.

AutoML

ML algorithms and model development involve a number of tasks that can benefit from automation like, feature engineering and model selection.

Feature engineering involves the detection and selection of relevant characteristics, properties, and attributes from datasets.

Model selection involves evaluating the performance of a group of ML classifiers, algorithms, or solutions to a given problem.

Both feature engineering and model selection activities require considerable time for ML engineers and data scientists to complete. Software developers frequently revisit these phases of the workflow to enhance model performance or accuracy.

Image of an analytics dashboard.
Figure 2. AutoML enables the automation of repetitive tasks such as numeric calculations
(Photo by Stephen Dawson on Unsplash)

There are several large ongoing projects to simplify the intricacies of an ML project pipeline. AutoML focuses on automating and augmentation workflows and their procedures to make ML easy accessible, and less manually intensive for non-ML experts.

Looking at the market value, projections expect the AutoML market to reach $14 billion by 2030. This would mean an increase ~42x higher than its current value.

This particular marriage of ML and automation is gaining traction, but there are limitations.

AutoML in practice

AutoML saves data scientists and computer engineers time. AutoML capabilities enable computer vision developers to dedicate more effort to other phases of the computer vision development pipeline that best use their skillset like model training, evaluation, and deployment. AutoML helps accelerate data aggregation, preparation, and hyperparameter optimization, but these parts of the workflow still require human input.

Data preparation and aggregation are needed to build the right model, but they are repetitive, time-consuming tasks that depend on locating appropriate data quality sources.

Likewise, hyperparameter tuning can take a lot of time to iterate to get the right algorithm performance. It involves a trial-and-error process with educated guesses. The amount of repeated work that goes into finding the appropriate hyperparameters can be tedious but critical for enabling the model’s training to achieve the desired accuracy.

For those interested in exploring GPU-powered AutoML, the widely used Tree-based Pipeline Optimization Tool (TPOT) is an automated ML library aimed at optimizing ML processes and pipelines through the utilization of genetic programming. RAPIDS cuML provides TPOT functionalities accelerated with GPU compute resources. For more information, see Faster AutoML with TPOT and RAPIDS.

Machine learning libraries and frameworks

ML libraries and frameworks are essential elements in any computer vision developer’s toolkit. Major DL libraries such as TensorFlow, PyTorch, Keras, and MXNet received continuous updates and fixes in 2021, and will likely continue to do so in the future.

More recently, there have been exciting advances going on in mobile-focused DL libraries and packages that optimize commonly used DL libraries.

MediaPipe extended its pose estimation capabilities in 2021 to provide 3D pose estimation through the BlazePose model, and this solution is available in the browser and on mobile environments. In 2022, expect to see more pose estimation applications in use cases involving dynamic movement and those that require robust solutions, such as motion analysis in dance and virtual character motion simulation.

PyTorch Lightning is becoming increasingly popular among researchers and professional ML practitioners due to its simplicity, abstraction of complex neural network implementation details, and augmentation of hardware considerations.

State-of-the-art deep learning

DL methods have long been used to tackle computer vision challenges. Neural network architectures for face detection, lane detection, and pose estimation all use deep consecutive layers of CNNs. A new architecture for computer vision algorithms is emerging: transformers.

The Transformer is a DL architecture introduced in Attention Is All You Need. The paper methodology creates a computational representation of data by using the attention mechanism to derive the significance of one part of the input data relative to other segments of the input data.

The Transformer does not use the conventions of CNNs, but research has shown the applications of transformer models in vision-related tasks. Transformers have made a considerable impact within the NLP domain. For more information, see Generative Pre-trained Transformer (GPT) and Bidirectional Encoder Representation From Transformer (BERT).

Explore a transformer model through the NGC Catalog that includes details of the architecture and utilization of an actual transformer model in PyTorch.

For more information about applying the Transformer network architecture to computer vision, see the Transformers in Vision: A Survey paper.

Mobile devices

Edge devices are becoming increasingly powerful. On-device inference capabilities are a must-have feature for mobile applications used by customers who expect quick service delivery and AI features.

Image of a smartphone on a table.
Figure 3. Mobile devices are a direct commercial application of computer vision features
(Photo by Homescreenify on Unsplash)

The incorporation of computer vision-enabling functionalities within mobile devices, like image and pattern recognition, reduces the latency for obtaining model inference results and provides benefits such as the following:

  • Reduced waiting time for obtaining inference results due to on-device computing.
  • Enhanced privacy and security due to the limited transfer of data between and to cloud servers.
  • Reduced cost of removing dependencies on cloud GPU and the CPU server for inference.

Many businesses are exploring mobile offerings, which includes exploring how existing AI functionality can be replicated on mobile devices. Here are several platforms, tools, and frameworks to implement mobile-first AI solutions:

Summary

Computer vision technology continues to increase as AI becomes more integrated in our daily lives. Computer vision is also becoming more and more common in the latest news headlines. As this technology scales, the demand for specialists with knowledge in computer vision systems will also rise due to trends in cloud computing service, Auto ML pipelines, transformers, mobile-focused DL libraries, and computer vision mobile applications.

In 2022, increased development in augmented and VR applications will enable computer vision developers to extend their skills into new domains, like developing intuitive and efficient methods of replicating and interacting with real objects in a 3D space. Looking ahead, computer vision applications will continue to change and influence the future.

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Newbie could use some guidance

I’ve been reading about TensorFlow for a few days now but it’s pretty overwhelming and I’m at that stage where everything I read makes me more confused and I need to get my foot in the door. I’m trying to use AI as part of a project I’m working on and maybe use it for other things in the future.

So what I’m working on needs to perform classification on time series. Most time series stuff is about forecasting, and what little I’ve found on time series classification only seems to have one attribute. I have multiple time series which have about 45 columns and about 250 rows and I’m reading them in from an SQL database and I will put them into NumPy for TF to use. I also have a few other little bits of data which may help with the prediction but aren’t really part of the time series. So each example will consist of a 45×250 array and a 3×1 array. How do I start with this?

I understand Flatten will turn the big array into a 11250×1 array, then I could (somehow) join it with the 3×1 array. Will this mess anything up? Does TensorFlow need to understand that these are values that are changing over time or does it not care?

I also have a column which has the day of the week in text, do I need to do something with this so that TF understands it? I figure I need to turn it into an integer but then TF needs to understand that it only goes from 1 – 7 and that after 7 it loops back to 1, rather than 8.

Last of all I need to understand how to build my neural network but don’t really have a clue how to do this. are there any recommended guides out there for someone who’s coming from a Python programming background rather than a statistical analysis background?

Sorry for the stupid questions, I appreciate any help I can get.

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Energy Grids Plug into AI for a Brighter, Cleaner Future

Electric utilities are taking a course in machine learning to create smarter grids for tough challenges ahead. The winter 2021 megastorm in Texas left millions without power. Grid failures the past two summers sparked devastating wildfires amid California’s record drought. “Extreme weather events of 2021 highlighted the risks climate change is introducing, and the importance Read article >

The post Energy Grids Plug into AI for a Brighter, Cleaner Future appeared first on NVIDIA Blog.

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Misc

A couple of questions about an UNET CNN implementation in Tensorflow

So I am a beginner in this field, for a summer project, I took datasets of chest CT scans and lesions and aimed to segment them, and to diagnose specific ILDs(interstitial lung diseases) based on them. My chest segmentation model runs very well(acc>98%), but its the lesion segmentation part(which I hope will diagnose specific diseases) which is giving me problems. So my model is a multi-class model, with 17 classes(same as labels and features too right?) such as ground_glass, fibrosis, bronchial_wall_thickening and so on,and the way it works is that if the input has a specific set of these features, a specific disease can be diagnosed. 17 classes seem too much for my system(32 gb DDR4, RTX 2060 mobile), and the code crashes during the train-test split part. The code runs well if I do not read the full dataset(which contains 1724 train and 431 test images, all 512x512x1), but then I get confused which classes are being processed, and how significant are the parameter values. How should I proceed to run my model without my IDE crashing due to RAM overload, and will Colab pro do the trick? Also what can I optimize in my code, will resizing the images to 128x128x1 help? And if yes how do I proceed with that?

P.S: Here my code(the dataset is not uploaded haha but my thought process would be better understood there)

P.Sx2: Also posted this on the DeepLearning sub, my apologies if you had to read this twice.

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Upcoming Event: How to Build an Edge Solution

​Join us on June 16 to take a deep dive into AI at the edge and learn how you can build an edge computing solution that delivers real-time results.

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What is Extended Reality?

Advances in extended reality have already changed the way we work, live and play, and it’s just getting started. Extended reality, or XR, is an umbrella category that covers a spectrum of newer, immersive technologies, including virtual reality, augmented reality and mixed reality. From gaming to virtual production to product design, XR has enabled people Read article >

The post What is Extended Reality? appeared first on NVIDIA Blog.

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Best Practices: Explainable AI Powered by Synthetic Data

Learn how financial institutions are using high-quality synthetic data to validate explainable AI models and comply with data privacy regulations.

Data sits at the heart of model explainability. Explainable AI (XAI) is a rapidly advancing field looking to provide insights into the complex decision-making processes of AI algorithms.

Where AI has a significant impact on individuals’ lives, like credit risk scoring, managers and consumers alike rightfully demand insight into these decisions. leading financial institutions are already leveraging XAI for validating their models. Similarly, regulators are also demanding insight into financial institutions’ algorithmic environment. But how is it possible to do that in practice?

Pandora’s closed box

The more advanced AI gets, the more important data becomes for explainability.

Modern day ML algorithms have ensemble methods and deep learning that result in thousands, if not millions of model parameters. They are impossible to grasp without seeing them in action when applied to actual data.

The need for broad access to data is apparent even and especially in cases where the training data is sensitive. Financial and healthcare data used for credit scoring and insurance pricing are some of the most frequently used, but also some of the most sensitive data types in AI.

It’s a conundrum of opposing needs: You want your data protected and you want a transparent decision.

Explainable AI needs data

So, how can these algorithms be made transparent? How can you judge model decisions made by machines? Given their complexity, disclosing the mathematical model, implementation, or the full training data won’t serve the purpose.

Instead, you have to explore a system’s behavior by observing its decisions across a variety of actual cases and probe its sensitivity with respect to modifications. These sample-based, what-if explorations help our understanding of what drives the decision of a model.

This simple yet powerful concept of systematically exploring changes in model output given variations of input data is also referred to as local interpretability and can be performed domain– and model-agnostic at scale. Thus, the same principle can be applied to help interpret credit-scoring systems, sales demand forecasts, fraud detection systems, text classifiers, recommendation systems, and more.

However, local interpretability methods like SHAP require access not only to the model but also to a large number of representative and relevant data samples.

Figure 1 shows a basic demonstration, performed on a model, predicting customer response to marketing activity within the finance industry. Looking at the corresponding Python calls reveals the need for the trained model, as well as a representative dataset for performing these types of analyses. However, what if that data is actually sensitive and can’t be accessed by AI model validators?

Driver analysis and dependency plots based on real-world data are built using SHAP, a local interpretability method.
Figure 1. Example of model explainability through SHAP using actual data

Synthetic data for scaling XAI across teams

In the early days of AI adoption, it was typically the same group of engineers who developed models and validated them. In both cases, they used real-world production data.

Given the real-world impact of algorithms on individuals, it is now increasingly understood that independent groups should inspect and assess models and their implications. These people would ideally bring diverse perspectives to the table from engineering and non-engineering backgrounds.

External auditors and certification bodies are being contracted to establish additional confidence that the algorithms are fair, unbiased, and nondiscriminative. However, privacy concerns and modern-day data protection regulations, like GDPR, limit access to representative validation data. This severely hampers model validation being broadly conducted.

Fortunately, model validation can be performed using high-quality AI-generated synthetic data that serves as a highly accurate, anonymized, drop-in replacement for sensitive data. For example, MOSTLY AI’s synthetic data platform enables organizations to generate synthetic datasets in a fully self-service, automated manner.

Figure 2 shows the XAI analysis being performed for the model with synthetic data. There are barely any discernible differences in results when comparing Figure 1 and Figure 2. The same insights and inspections are possible by leveraging MOSTLY AI’s privacy-safe synthetic data, which finally enables true collaboration to perform XAI at scale and on a continuous basis.

Driver analysis and dependency plots based on synthetic data are built using SHAP, a local interpretability method.
Figure 2. Example of model explainability through SHAP using synthetic data

Figure 3 shows the process of scaling model validation across teams. An organization runs a state-of-the-art synthetic data solution within their controlled compute environment. It continuously generates synthetic replicas of their data assets, which can be shared with a diverse team of internal and external AI validators.

Flow diagram depicting financial institutions using real-world data to generate synthetic data for external AI auditing and validation.
Figure 3. Process flow for model validation through synthetic data

Scaling to real-world data volumes with GPUs

GPU-accelerated libraries, like RAPIDS and Plotly, enable model validation at the scale required for real-world use cases encountered in practice. The same applies to generating synthetic data, where AI-powered synthetization solutions such as MOSTLY AI can benefit significantly from running on top of a full-stack accelerated computing platform. For more information, see Accelerating Trustworthy AI for Credit Risk Management.

To demonstrate, we turned to the mortgage loan dataset published by Fannie Mae (FNMA) for the purpose of validating an ML model for loan delinquencies. We started by generating a statistical representative synthetic replica of the training data, consisting of tens of millions of synthetic loans, composed of dozens of synthetic attributes (Figure 4).

All data is being artificially created and no single record can be linked back to any actual record from the original dataset. However, the structure, patterns, and correlations of the data are faithfully retained in the synthetic dataset.

This ability to capture the diversity and richness of data is critical for model validation. The process seeks to validate model behavior not only on the dominant majority classes but also on under-represented and most vulnerable minority segments within a population.

Comparison of real and synthetic Fannie Mae mortgage loan datasets used to validate machine learning models for loan delinquencies.
Figure 4. A snapshot of real and synthetic data samples

Given the generated synthetic data, you can then use GPU-accelerated XAI libraries to compute statistics of interest to assess model behavior.

Figure 5, for example, displays a side-by-side comparison of SHAP values: the loan delinquency model being explained on the real data and after being explained on the synthetic data. The same conclusions regarding the model can be reliably derived by using high-quality synthetic data as a drop-in alternative to the sensitive original data.

Side-by-side comparison of SHAP values for loan delinquency models explained by real-world and synthetic data shows similar conclusions.
Figure 5. SHAP values of the ML model for loan delinquencies

Figure 5 shows that synthetic data serves as a safe drop-in replacement for the actual data for explaining model behavior.

Further, the ability of synthetic data generators to yield an arbitrary amount of new data enables you to improve the model validation significantly for smaller groups.

Figure 6 shows a side-by-side comparison of SHAP values for a specific ZIP code found within the dataset. While the original data had less than 100 loans for a given geography, we leverage 10x the data volume to inspect the model behavior in that area, enabling more detail and richer insights.

Side-by-side comparison of SHAP values for a specific ZIP code found within the mortgage loan delinquency dataset using synthetic data oversampling for richer insights.
Figure 6. Richer insights by performing model validation with synthetic oversampling

Individual-level inspection with synthetic samples

While summary statistics and visualizations are key to analyzing the general model behavior, our understanding of models further benefits from inspecting individual samples on a case-by-case basis.

XAI tooling reveals the impact of multiple signals on the final model decision. These cases need not necessarily be actual cases, as long as synthetic data is realistic and representative.

Figure 7 displays four randomly generated synthetic cases with their final model predictions and corresponding decomposition for each of the input variables. This enables you to gain insights on what factor contributed to what extent and what direction to the model decision for unlimited potential cases without exposing the privacy of any individual.

Four randomly generated synthetic datasets with final model predictions and corresponding decomposition for each of the input variables.
Figure 7. Inspecting model predictions of four randomly sampled synthetic records

Effective AI governance with synthetic data

AI-powered services are becoming more present across private and public sectors, playing an ever bigger role in our daily lives. Yet, we are only at the dawn of AI governance.

While regulations, like Europe’s proposed AI Act, will take time to manifest, developers and decision-makers must act responsibly today and adopt XAI best practices. Synthetic data enables a collaborative, broad setting, without putting the privacy of customers at risk. It’s a powerful, novel tool to support the development and governance of fair and robust AI.

For more information about AI explainability in banking, see the following resources: