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Learning and Interpreting Gravitational-Wave Features from CNNs with a Random Forest Approach

Tian, Jun, Wang, He, He, Jibo, Pan, Yu, Cao, Shuo, Jiang, Qingquan

arXiv.org Artificial Intelligence

Convolutional neural networks (CNNs) have become widely adopted in gravitational wave (GW) detection pipelines due to their ability to automatically learn hierarchical features from raw strain data. However, the physical meaning of these learned features remains underexplored, limiting the interpretability of such models. In this work, we propose a hybrid architecture that combines a CNN-based feature extractor with a random forest (RF) classifier to improve both detection performance and interpretability. Unlike prior approaches that directly connect classifiers to CNN outputs, our method introduces four physically interpretable metrics - variance, signal-to-noise ratio (SNR), waveform overlap, and peak amplitude - computed from the final convolutional layer. These are jointly used with the CNN output in the RF classifier to enable more informed decision boundaries. Tested on long-duration strain datasets, our hybrid model outperforms a baseline CNN model, achieving a relative improvement of 21\% in sensitivity at a fixed false alarm rate of 10 events per month. Notably, it also shows improved detection of low-SNR signals (SNR $\le$ 10), which are especially vulnerable to misclassification in noisy environments. Feature attribution via the RF model reveals that both CNN-extracted and handcrafted features contribute significantly to classification decisions, with learned variance and CNN outputs ranked among the most informative. These findings suggest that physically motivated post-processing of CNN feature maps can serve as a valuable tool for interpretable and efficient GW detection, bridging the gap between deep learning and domain knowledge.


Researchers question reliability of Abbott's rapid malaria tests

Science

The World Health Organization (WHO) has sent an internal memo about potential problems with a major company's malaria tests after scientists reported issues with test sensitivity and warned it could delay patients' access to critical treatment. Abbott's Bioline rapid diagnostic tests (RDTs) for malaria are used by health workers around the world, particularly in remote areas where lab techniques such as microscopy and DNA detection aren't available. Investigations at several institutions in Southeast Asia suggest at least some of these RDTs fail to detect infections or show faint test lines for some positive cases. Daniel Ngamije Madandi, director of WHO's Global Malaria Programme (GMP), issued the memo to WHO's six regional offices on 30 April. It lists 11 "affected" lots from two Abbott RDTs--Pf/Pv and Pf/Pan--that were associated with "faint lines and false negative results" in reports from "multiple research groups." The memo follows a public notice by WHO in March that warned of reports of faint lines in malaria RDTs without mentioning particular brands or products.


Can Sam Altman Be Trusted with the Future?

The New Yorker

In 2017, soon after Google researchers invented a new kind of neural network called a transformer, a young OpenAI engineer named Alec Radford began experimenting with it. What made the transformer architecture different from that of existing A.I. systems was that it could ingest and make connections among larger volumes of text, and Radford decided to train his model on a database of seven thousand unpublished English-language books--romance, adventure, speculative tales, the full range of human fantasy and invention. Then, instead of asking the network to translate text, as Google's researchers had done, he prompted it to predict the most probable next word in a sentence. The machine responded: one word, then another, and another--each new term inferred from the patterns buried in those seven thousand books. Radford hadn't given it rules of grammar or a copy of Strunk and White.


Building Machine Learning Challenges for Anomaly Detection in Science

Campolongo, Elizabeth G., Chou, Yuan-Tang, Govorkova, Ekaterina, Bhimji, Wahid, Chao, Wei-Lun, Harris, Chris, Hsu, Shih-Chieh, Lapp, Hilmar, Neubauer, Mark S., Namayanja, Josephine, Subramanian, Aneesh, Harris, Philip, Anand, Advaith, Carlyn, David E., Ghosh, Subhankar, Lawrence, Christopher, Moreno, Eric, Raikman, Ryan, Wu, Jiaman, Zhang, Ziheng, Adhi, Bayu, Gharehtoragh, Mohammad Ahmadi, Monsalve, Saúl Alonso, Babicz, Marta, Baig, Furqan, Banerji, Namrata, Bardon, William, Barna, Tyler, Berger-Wolf, Tanya, Dieng, Adji Bousso, Brachman, Micah, Buat, Quentin, Hui, David C. Y., Cao, Phuong, Cerino, Franco, Chang, Yi-Chun, Chaulagain, Shivaji, Chen, An-Kai, Chen, Deming, Chen, Eric, Chou, Chia-Jui, Ciou, Zih-Chen, Cochran-Branson, Miles, Choi, Artur Cordeiro Oudot, Coughlin, Michael, Cremonesi, Matteo, Dadarlat, Maria, Darch, Peter, Desai, Malina, Diaz, Daniel, Dillmann, Steven, Duarte, Javier, Duporge, Isla, Ekka, Urbas, Heravi, Saba Entezari, Fang, Hao, Flynn, Rian, Fox, Geoffrey, Freed, Emily, Gao, Hang, Gao, Jing, Gonski, Julia, Graham, Matthew, Hashemi, Abolfazl, Hauck, Scott, Hazelden, James, Peterson, Joshua Henry, Hoang, Duc, Hu, Wei, Huennefeld, Mirco, Hyde, David, Janeja, Vandana, Jaroenchai, Nattapon, Jia, Haoyi, Kang, Yunfan, Kholiavchenko, Maksim, Khoda, Elham E., Kim, Sangin, Kumar, Aditya, Lai, Bo-Cheng, Le, Trung, Lee, Chi-Wei, Lee, JangHyeon, Lee, Shaocheng, van der Lee, Suzan, Lewis, Charles, Li, Haitong, Li, Haoyang, Liao, Henry, Liu, Mia, Liu, Xiaolin, Liu, Xiulong, Loncar, Vladimir, Lyu, Fangzheng, Makarov, Ilya, Mao, Abhishikth Mallampalli Chen-Yu, Michels, Alexander, Migala, Alexander, Mokhtar, Farouk, Morlighem, Mathieu, Namgung, Min, Novak, Andrzej, Novick, Andrew, Orsborn, Amy, Padmanabhan, Anand, Pan, Jia-Cheng, Pandya, Sneh, Pei, Zhiyuan, Peixoto, Ana, Percivall, George, Leung, Alex Po, Purushotham, Sanjay, Que, Zhiqiang, Quinnan, Melissa, Ranjan, Arghya, Rankin, Dylan, Reissel, Christina, Riedel, Benedikt, Rubenstein, Dan, Sasli, Argyro, Shlizerman, Eli, Singh, Arushi, Singh, Kim, Sokol, Eric R., Sorensen, Arturo, Su, Yu, Taheri, Mitra, Thakkar, Vaibhav, Thomas, Ann Mariam, Toberer, Eric, Tsai, Chenghan, Vandewalle, Rebecca, Verma, Arjun, Venterea, Ricco C., Wang, He, Wang, Jianwu, Wang, Sam, Wang, Shaowen, Watts, Gordon, Weitz, Jason, Wildridge, Andrew, Williams, Rebecca, Wolf, Scott, Xu, Yue, Yan, Jianqi, Yu, Jai, Zhang, Yulei, Zhao, Haoran, Zhao, Ying, Zhong, Yibo

arXiv.org Artificial Intelligence

Scientific discoveries are often made by finding a pattern or object that was not predicted by the known rules of science. Oftentimes, these anomalous events or objects that do not conform to the norms are an indication that the rules of science governing the data are incomplete, and something new needs to be present to explain these unexpected outliers. The challenge of finding anomalies can be confounding since it requires codifying a complete knowledge of the known scientific behaviors and then projecting these known behaviors on the data to look for deviations. When utilizing machine learning, this presents a particular challenge since we require that the model not only understands scientific data perfectly but also recognizes when the data is inconsistent and out of the scope of its trained behavior. In this paper, we present three datasets aimed at developing machine learning-based anomaly detection for disparate scientific domains covering astrophysics, genomics, and polar science. We present the different datasets along with a scheme to make machine learning challenges around the three datasets findable, accessible, interoperable, and reusable (FAIR). Furthermore, we present an approach that generalizes to future machine learning challenges, enabling the possibility of large, more compute-intensive challenges that can ultimately lead to scientific discovery.


The rage epidemic: is our modern world fuelling aggression?

The Guardian

Last week a video showing 60-year-old Peter Abbott screaming abuse at TV producer Samantha Isaacs gained a viral audience, after Abbott was found guilty at Poole magistrates court of "using threatening words or behaviour to cause alarm, distress or fear of violence". In the phone-filmed video, Abbott is seen snarling and shouting as he presses his face up against Isaacs' car window. He looks as if he's channelling the Harry Enfield character Angry Frank, so cartoonishly aggressive are his contorted facial expressions and confrontational behaviour. Not only did he hammer on Isaacs' car but he also called her a "slag" and a "whore". When another male driver pointed out the terrible optics of bullying a woman, he replied: "She's a fucking bloody annoying woman."


Cross-Temporal Spectrogram Autoencoder (CTSAE): Unsupervised Dimensionality Reduction for Clustering Gravitational Wave Glitches

Li, Yi, Wu, Yunan, Katsaggelos, Aggelos K.

arXiv.org Artificial Intelligence

The advancement of The Laser Interferometer Gravitational-Wave Observatory (LIGO) has significantly enhanced the feasibility and reliability of gravitational wave detection. However, LIGO's high sensitivity makes it susceptible to transient noises known as glitches, which necessitate effective differentiation from real gravitational wave signals. Traditional approaches predominantly employ fully supervised or semi-supervised algorithms for the task of glitch classification and clustering. In the future task of identifying and classifying glitches across main and auxiliary channels, it is impractical to build a dataset with manually labeled ground-truth. In addition, the patterns of glitches can vary with time, generating new glitches without manual labels. In response to this challenge, we introduce the Cross-Temporal Spectrogram Autoencoder (CTSAE), a pioneering unsupervised method for the dimensionality reduction and clustering of gravitational wave glitches. CTSAE integrates a novel four-branch autoencoder with a hybrid of Convolutional Neural Networks (CNN) and Vision Transformers (ViT). To further extract features across multi-branches, we introduce a novel multi-branch fusion method using the CLS (Class) token. Our model, trained and evaluated on the GravitySpy O3 dataset on the main channel, demonstrates superior performance in clustering tasks when compared to state-of-the-art semi-supervised learning methods. To the best of our knowledge, CTSAE represents the first unsupervised approach tailored specifically for clustering LIGO data, marking a significant step forward in the field of gravitational wave research. The code of this paper is available at https://github.com/Zod-L/CTSAE


Convolutional Neural Networks for signal detection in real LIGO data

Zelenka, Ondřej, Brügmann, Bernd, Ohme, Frank

arXiv.org Artificial Intelligence

Searching the data of gravitational-wave detectors for signals from compact binary mergers is a computationally demanding task. Recently, machine learning algorithms have been proposed to address current and future challenges. However, the results of these publications often differ greatly due to differing choices in the evaluation procedure. The Machine Learning Gravitational-Wave Search Challenge was organized to resolve these issues and produce a unified framework for machine-learning search evaluation. Six teams submitted contributions, four of which are based on machine learning methods and two are state-of-the-art production analyses. This paper describes the submission from the team TPI FSU Jena and its updated variant. We also apply our algorithm to real O3b data and recover the relevant events of the GWTC-3 catalog.


Compact Binary Systems Waveform Generation with Generative Pre-trained Transformer

Shi, Ruijun, Zhou, Yue, Zhao, Tianyu, Cao, Zhoujian, Ren, Zhixiang

arXiv.org Artificial Intelligence

Space-based gravitational wave detection is one of the most anticipated gravitational wave (GW) detection projects in the next decade, which is promising to detect abundant compact binary systems. However, the precise prediction of space GW waveforms remains unexplored. To solve the data processing difficulty in the increasing waveform complexity caused by detectors' response and second-generation time-delay interferometry (TDI 2.0), an interpretable pre-trained large model named CBS-GPT (Compact Binary Systems Waveform Generation with Generative Pre-trained Transformer) is proposed. For compact binary system waveforms, three models were trained to predict the waveforms of massive black hole binary (MBHB), extreme mass-ratio inspirals (EMRIs), and galactic binary (GB), achieving prediction accuracies of 99%, 91%, and 99%, respectively at most.The CBS-GPT model exhibits notable generalization and interpretability, with its hidden parameters effectively capturing the intricate information of waveforms, even with complex instrument response and a wide parameter range. Our research demonstrates the potential of large pre-trained models in gravitational wave realm, opening up new opportunities and guidance for future researches such as the complex waveforms generation, gap completion, and deep learning model design for GW science.


Biden does not have 'cognitive ability' to serve another term, says former WH doctor

FOX News

Rep. Ronny Jackson, R-Texas, on the health of the president as Biden turns 81 and Texas Gov. Abbott endorses Trump for the 2024 presidential election The former White House physician for Presidents Obama and Trump expressed concern Monday about President Biden's health and mental acuity as the president turns 81. Rep. Ronny Jackson, R-Texas, said on "FOX & Friends" that the growing concerns, including from the left, are valid. "I've been saying for quite some time now, when he was candidate Joe Biden, that I didn't think that he had the cognitive ability to do the job," said Jackson. Additionally, Jackson emphasized that Biden has "degenerated" over the last three years. "He's got these people that surround him that are inappropriately encouraging him to continue to run because it builds up who they are and what they do. But our border, our wars overseas, our economy, you know, it's just a disaster right now. And he just can't do the job. And it's just on display every day that he's not capable of doing this job anymore," Jackson warned.


The Download: digital hide-and-seek, and AI for African languages

MIT Technology Review

It's not a typical hide-and-seek game, though, but rather one for the digital age: both the seekers and the hiders chase and evade each other by following their real-time locations on a map on their phones.Our reporter Zeyi Yang played a game with 40 strangers in a seven-acre park built on the site of the infamous Kowloon Walled City. Inside a co-working space in the Rosebank neighborhood of Johannesburg, Jade Abbott popped open a tab on her computer and prompted ChatGPT to count from 1 to 10 in isiZulu, a language spoken by more than 10 million people in her native South Africa. The results were "mixed and hilarious," says Abbott, a computer scientist and researcher. Then she typed in a few sentences in isiZulu and asked the chatbot to translate them into English. Abbott's experience mirrors the situation faced by Africans who don't speak English.