United States

The pursuit to generate visually pleasing images that are good representatives of a given category has been one of the driving forces of developments in generative vision models. One such model that is based on Generative Adversarial Networks (GAN) is called the Auxiliary Classifier Generative Adversarial Networks (AC-GAN). AC-GAN uses an auxiliary classifier to enable sampling from a class conditional distribution and is known to generate high-quality aesthetically pleasing synthetic data. Due to its simplicity, it is one of the popular GAN architectures for generating data. However, it has been shown that AC-GANs tend to learn data distributions that are biased away from the decision boundary of the auxiliary classifier. This bias away from the decision boundary is the unwanted by-product of a loss term in the AC-GAN formulation that favors high image quality and visual class coherence. That is, the AC-GAN generator is rewarded for generating samples that are towards the center of the decision region and discouraged from sampling near the class boundaries defined by the auxiliary classifier. In this work, we propose using a boundary aware loss in conjunction with the AC-GAN losses to mitigate the bias. We show that the introduction of the boundary-aware loss into AC-GAN formulation provides better sampling coverage within the underlying data distribution, increasing data diversity and reducing bias

NAML 2025

A Boundary Aware Loss for Mitigating the Boundary Bias in AC-GAN

generative modeling

decision boundary

poster

### Welcome to the 9th annual workshop on Naval Applications of Machine Learning!

NAML is the premier annual event showcasing current machine learning research relevant to Naval applications. We welcome participation from the defense community, industry, and academia. The NAML workshop is an opportunity for researchers from Navy research and development centers and our partner organizations to exchange technical ideas and to come together as a team. 
 Naval Information Warfare Center Pacific is partnering with AFCEA San Diego chapter to host the workshop.

The goals of NAML are:

* To spread awareness of current machine learning research relevant to Naval applications
* To connect machine learning researchers with experts in military requirements
* To build and strengthen collaborations within the defense research community

#### *"What we do as a Navy is a human business. Don’t pass up an opportunity to come together as a team. Don’t pass up leadership opportunities, and don’t outsource them to a PowerPoint. If you have an opportunity to come together as a team, to increase belonging, do it."*
Admiral John M. Richardson, 31st Chief of Naval Operations

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The 9th annual workshop on Naval Applications of Machine Learning is an opportunity for researchers from Navy research and development centers and our partner organizations to exchange technical ideas and to come together as a team. The goals of NAML are to spread awareness of current machine learning research relevant to Naval applications, to connect machine learning researchers with experts in military requirements and to build and strengthen collaborations within the defense research community.

Memory vulnerabilities allow adversaries to access memory and manipulate software to perform unintended actions. Memory vulnerabilities are commonly found in Memory Unsafe Languages(MULs), e.g. C and C++, which have been used to develop a wide range of software from personal use to critical systems. The Office of the National Cyber Director(ONCD) recommended developing future software with Memory Safe Languages (MSLs) to eliminate memory vulnerabilities introduced by MULs. Unfortunately, this does not address pre-existing software. One solution for pre-existing MUL based code is translating it from a MUL to MSL. However, this requires developers to have a strong understanding of both the MUL and MSL, as well as a considerable of time that is put into the translation and the follow up regression testing. 

Large Language Model (LLM) based Artificial Intelligence(AI) are now being used to support software development and can translate software written in a one language to another. LLM based translation could help reduce resource cost when translating MUL into am MSL to reduce memory-based software vulnerabilities. Although a review of the LLM translated code could mitigate these vulnerabilities, numerous peer reviewed articles have documented significant errors in AI translated code. The ACTA project will assess the efficacy of LLMs’ ability to translate software into MSL and, determine if they introduce other vulnerabilities during the process. The output of ACTA will be a report assessing the frequency and type of vulnerabilities produced for various LLMs which can be used to determine if LLMs can be used to assist in code translation. 


AI Code Translation Assessment (ACTA)

Title: "The Value of Multilingual Semantic Search for the U.S. Navy: Enhancing International Cooperation and Strategic Insights"

Abstract: The U.S. Navy's ability to operate in an increasingly globalized and interconnected world is dependent on its capacity to process and interpret vast amounts of multilingual information. Introducing multilingual semantic search technology significantly enhances the Navy's intelligence, surveillance, and reconnaissance capabilities. Oracle will present how Multilingual semantic search empowers sailors to conduct comprehensive searches across a multitude of foreign languages without having to declare what languages to search across, opening new avenues for international cooperation and strategic insights.

In today's complex geopolitical landscape, the U.S. Navy frequently engages in exercises and operations alongside partner Navies, emphasizing the need for seamless communication and information exchange. With multilingual semantic search, naval personnel can overcome language barriers and efficiently collaborate with allies. This capability enables the Navy to consolidate disparate pieces of information, identifying overarching trends and patterns hidden within vast datasets. 

Traditional workflows that rely entirely on machine translation often incorrectly translate documents and are cost prohibitive due to the scale of foreign language documentation. Multilingual semantic search can assist in identify trends through foreign language documentation that may otherwise be missed through traditional searches on machine translated text. 

By enabling sailors to query documentation in multiple languages, the multilingual semantic search helps uncovers hidden connections and facilitates a more comprehensive understanding of the situation at hand. The applications extend beyond international cooperation. Multilingual semantic search can aid in monitoring and analyzing global maritime trends, illegal activities, or emerging threats. It allows sailors to delve into foreign language sources, including local media, online forums, and international reports, potentially uncovering critical intelligence insights. By harnessing the power of semantic search, the Navy becomes better equipped to anticipate and respond to diverse scenarios, enhancing its situational awareness and strategic planning.

In summary, the implementation of multilingual semantic search represents a significant leap forward in the U.S. Navy's information management and analysis capabilities. It can support international collaboration, facilitates cultural understanding, and empowers sailors to make well-informed decisions in a multilingual world.

The Value of Multilingual Semantic Search for the U.S. Navy: Enhancing International Cooperation and Strategic Insights

Color correction is integral to the understanding and preservation of important underwater historical sites. The varying depths, as well as the inconsistent and artificial lighting of these sites, pose unique challenges that current state-of-the-art color correction algorithms are not able to successfully correct. These algorithms often overcompensate the red channel during inference, creating inaccurate and unrealistic images. In this paper, we use the depth map created by a monocular depth estimation algorithm to guide adjustments to the red channel of an underwater image prior to performing color correction. We test our methodology on four datasets; two open source, and two collected by Vulcan, LLC. This data was provided to us by the Naval Heritage and History Command (NHHC), as managers of Department of the Navy's sunken military craft, for the purposes of historical, archaeological, and educational research. Using our preprocessed images as the foundation, we are able to create more visually realistic images with true-to-life coloring. Finally, we create 3D reconstructions via Neural Radiance Fields (NeRFs) and Gaussian splats, with and without our preprocessing. We show that the inclusion of our preprocessing step produces more realistic images with fewer artifacts, resulting in a more accurate 3D reconstruction.

Color Correction of Deep Underwater Images Using Depth Maps

Naval tasking and new technologies often require intense cognitive engagement, but it has proven challenging to provide an objective evaluation of how these technological advances affect the warfighter user and thus how they affect decision-optimization. In this work, we address these challenges by using an AI/ML neuro-ergonomic approach that combines state-of-the-art concepts in brain computer interface (BCI) technology with cognitive state detection. We, the NeuroML Research Team of NIWC Pacific’s Intelligent Sensing Branch, build upon research in which we have addressed multiple key challenges contributing to the development of a passive BCI (pBCI), by developing a demonstration of a real-time cognitive workload classifier.

Real Time Cognitive Engagement Classification using CNNs

SeaVision is the U.S. Navy's unclassified data aggregation, data visualization, and sharing tool of tracks for maritime domain awareness (MDA), incorporating AIS, commercial satellite, RADAR, and other feeds into a unified picture. Currently, there is a need for higher-level sensemaking capabilities, including warning and event modules, to identify high-risk vessels and automate understanding of behaviors across an area of responsiblity (AOR). In this poster presentation, we demonstrate the process of identifying a high-risk vessel from a slice of historical data based on data processed from the SeaVision and highlight a hybrid-HPC/cloud development workflow that our team leverages to enable the cost-effective development and deployment of machine learning algorithms applied to these large-scale data. Finally, our team describes how system modeling techniques are leveraged to drive stakeholder engagment throughout the project.

MUSES: Multimodal Sensemaking in SeaVision

We investigate a real-time remote inference system where multiple correlated sources transmit observations over a communication channel to a receiver. The receiver utilizes these observations to infer multiple time-varying targets. Due to limited communication resources, the delivered observations may not be fresh. To quantify data freshness, we employ the Age of Information (AoI) metric. To minimize the inference error, we aim to design a signal-agnostic scheduling policy that leverages AoI without requiring knowledge of the actual target values or the source observations. This scheduling problem is a restless multi-armed bandit (RMAB) problem with a non-separable penalty function. Unlike traditional RMABs, the correlation among sources introduces a unique challenge: the penalty function of each source depends on the AoI of other correlated sources, preventing decomposition of the problem into multiple independent Markov Decision Processes (MDPs), a key step in applying traditional RMAB solutions. To address this, we propose a novel approach by approximating the penalty function of each source and establish an analytical bound on the approximation error. We then develop scheduling policies for two scenarios: (i) full knowledge of the penalty functions and signal distributions and (ii) no knowledge of the penalty functions and signal distributions. For the case of known penalty functions, we present a near-asymptotically optimal gain index-based policy. For the case of unknown penalty functions and signal distributions, we develop an online learning approach that utilizes feedback of the inference loss to learn an online Maximum Gain First (MGF) policy. Simulation results demonstrate the effectiveness of our proposed policies in minimizing inference error and achieving scalability in the number of sources.

AoI-based Scheduling of Correlated Sources for Timely Inference

Climate modelling has long been crucial to disaster management, protecting existing infrastructure, and tactical success, with weather forecasts informing critical military decisions since D-day. In the modern era, the vast majority of weather modelling relies on centralized numerical weather prediction (NWP) models which are incredibly expensive to run, develop, and ultimately have limited performance especially at longer timescales. 

However, nascent AI approaches have recently beat traditional modelling approaches across metrics, achieving greater accuracy for far less training, inference, and development time. ClimAI presents a novel geospatial foundation model (GFM) architecture improving the existing vision transformer (ViT) patch embedding. The ViT architecture uses patches representing regions of space and time over the input data. However, weather reanalysis datasets, such as ERA5, provide weather data as projections of the Earth’s spheroidal topology onto a rectangle. This introduces both position-dependent warping and an arbitrary seam at the 180° line of longitude. This may be eliminated by considering the topology of the ERA5 dataset as a cylinder, achieving a general topologically-informed patch embedding that is more robust and performant, ensuring consistent patch representation across latitudes and mitigating the 180° line of longitude seam in the Pacific. Further, we demonstrate that by selecting patches in spherical coordinates, the model weights geospatial weather data equally across the globe, improving the model’s generalization. 

GFM models are not only more accurate, but orders of magnitude cheaper to use than traditional NWP approaches, with our model being possible to perform inference in seconds on even CPU-only compute. Our team and NOAA stakeholders are excited about the future of AI enabling distributed and domain-specific geospatial modelling for specific needs without relying on requests to a centralized agency, such as NOAA’s existing supercompute infrastructure, enabling generalizable on-prem geospatial time-series forecasts.

ClimAI: Improving Patch Embeddings for Geospatial Foundation Models

Many of the current state of the art Intelligent Autonomous Systems (IAS) and robotics systems use Inertial Measurement Units (IMU) for navigation and control. The magnitude of the effect is unknown leaving a large gap in knowledge. We present our findings of a mobile robot operating on a ship deck that is underway. We operated our mobile robot at a Coastal Trident event collecting both GPS and IMU data while the mobile robot drove around the ship deck. This data give insight into how we can be to develop methods for accurate state estimation. This is the first critical step in developing robust controller for autonomous robots. The results show the robots reaction as the ship moves and sways. We compare the IMU on the robot to that of the ship to cancel out the motion of the ship.

Ship Experiments for Autonomous Locomotion and Euler Guidance Systems  (SEA LEGS) 

A system for the real-time estimation of an evolving underwater plume using a single sensor is presented. This system includes the plant, which models the evolving plume and provides synthetic data, and the estimator, which detects, measures, and reconstructs the plume using a hybrid Luenberger-naive observer. Preliminary results are shown, and current work in the measurement of gradients and trajectory planning are discussed.

Real-Time Plume Estimation with an Autonomous Underwater Vehicle

Data unification is the process of combining data from multiple sources into a single, consistent view. It helps resolve inconsistencies, redundancies, and discrepancies in the data. This creates benefits for many business operations such AI, Analytics, and Cyber Security analysis. Data unification also promotes data governance and trustworthy AI. Data Unification can also help Navy get around vendor lock. Data unification doesn't mean that Navy must move data. Many time it is often better to leave data where it is. Instead, we can utilize data unification tools to work with data where it currently resides.  This poster session will provide attendees with an overview of data unification tools, architecture, and processes beneficial to helping Navy achieve advance analysis, AI, and Cyber Security goals.

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A Boundary Aware Loss for Mitigating the Boundary Bias in AC-GAN

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AI Code Translation Assessment (ACTA)

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