RankGraph-2: Lifecycle Co-Design for Billion-Node Graph Learning in Recommendation

Posted by klaurent Peking

Kavli Affiliate: Xian Chen| Summary: Graph-based retrieval at billion-node scale requires jointly solving three tightly coupled problems — graph construction, representation learning, and real-time serving — yet existing work addresses each in isolation. We present RankGraph-2, a framework deployed at Meta that co-designs all three lifecycle stages for similarity-based retrieval (U2U2I and U2I2I), where each […]


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Do Time Series Foundation Model Benchmarks Hide Regime-Dependent Failures? Evidence from Traffic Speed Forecasting

Posted by klaurent Caltech

Kavli Affiliate: Wei Gao| Summary:Standard benchmarks evaluate time series foundation models (TSFMs) using aggregate metrics, but these can mask severe failures in critical operating regimes. We introduce regime-stratified evaluation and apply it to three TSFMs on two standard traffic speed benchmarks. Traffic exhibits abrupt regime switching between free-flow and congested states, producing bimodal speed distributions […]


Continue.. Do Time Series Foundation Model Benchmarks Hide Regime-Dependent Failures? Evidence from Traffic Speed Forecasting

Do Time Series Foundation Model Benchmarks Hide Regime-Dependent Failures? Evidence from Traffic Speed Forecasting

Posted by klaurent Caltech

Kavli Affiliate: Wei Gao| Summary:Standard benchmarks evaluate time series foundation models (TSFMs) using aggregate metrics, but these can mask severe failures in critical operating regimes. We introduce regime-stratified evaluation and apply it to three TSFMs on two standard traffic speed benchmarks. Traffic exhibits abrupt regime switching between free-flow and congested states, producing bimodal speed distributions […]


Continue.. Do Time Series Foundation Model Benchmarks Hide Regime-Dependent Failures? Evidence from Traffic Speed Forecasting

Calsyntenin-1 and calsyntenin-3 coordinate TGN exit of axonal cargoes

Posted by dbos Yale

Kavli Affiliate: Shawn Ferguson | Authors: Derk Draper, Noortje Kersten, Shietela Sewnarain Sukul, Rebecca Jark, Inge Rothuis, Poorvi Ravindra, Aniruddha Mitra, Lukas C. Kapitein, Shawn Ferguson, Judith Klumperman and Ginny G. Farías | Summary: Neurons rely on precise biosynthetic protein transport from the soma to the axon and dendrites. Brain-enriched calsyntenins (CSTN1–3) are unique transmembrane […]


Continue.. Calsyntenin-1 and calsyntenin-3 coordinate TGN exit of axonal cargoes

Late-time JWST/NIRCam Observations of the Extremely Long-duration GRB 250702B/EP 250702a and Its Host Galaxy

Posted by klaurent MIT

Kavli Affiliate: Dheeraj Pasham | Summary:We present JWST/NIRCam observations of the extremely long-duration gamma-ray burst (GRB) 250702B taken at ~ 95 days post-GRB (observer frame). The observations of the host galaxy reveal a single galaxy with a prominent dust lane observed nearly edge-on. Prospector modeling of the host galaxy photometry finds a high stellar mass […]


Continue.. Late-time JWST/NIRCam Observations of the Extremely Long-duration GRB 250702B/EP 250702a and Its Host Galaxy

Kes 75 with IXPE: Detection of Nebular X-ray Polarization and Change in Pulsar Lightcurve

Posted by klaurent Stanford

Kavli Affiliate: Roger Romani | Summary:We present the first X-ray polarization measurements of the PSR/PWN complex within SNR Kes 75. Two $rm sim,500,ks$ IXPE observations were conducted in October/November 2024 and April 2025. The second observation yields a significant phase-average 2-8 keV polarization degree $rm PD = 9.9% pm 2.5%$ at $rm PA=36.8^circ pm 7.3^circ$, […]


Continue.. Kes 75 with IXPE: Detection of Nebular X-ray Polarization and Change in Pulsar Lightcurve

Experimental Characterization and Modeling of Measurement-Induced State-Transitions in a Fluxonium Superconducting Qubit

Posted by klaurent Delft

Kavli Affiliate: Christian Andersen | Summary: Superconducting qubits are most often measured using dispersive readout, which, ideally, implements a projective quantum non-demolition (QND) measurement. While a larger readout drive can increase the signal and, thus, reduce discrimination errors in the readout, strong microwave drives may also cause non-QND errors by driving the qubit to a […]


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Tracing the very early disruption of the Sagittarius dwarf galaxy in the distant Milky Way halo

Posted by klaurent Chicago

Kavli Affiliate: Alexander Ji | Summary:Current models predict that at distances beyond 80 kpc in the Milky Way halo, we can find the earliest escaped stars from the merging Sagittarius dwarf galaxy. However, observational data on the Sagittarius stream at these distances is limited. This study examines an overdensity of red giant branch (RGB) stars […]


Continue.. Tracing the very early disruption of the Sagittarius dwarf galaxy in the distant Milky Way halo

SpecGen: Accelerating Agentic Kernel Optimization with Speculative Generation

Posted by klaurent Caltech

Kavli Affiliate: Wei Gao| Summary:Agentic kernel optimization automates manual GPU kernel tuning via iterative generation, validation, and profiling with reasoning LLMs, casting the optimization task as feedback-guided search. However, our workload characterization reveals three system-level inefficiencies that limit search efficiency: (1) long generation latency due to LLM reasoning, (2) insufficient profiling feedback, and (3) underutilized […]


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Characterization of ultrathin nickel films deposited by thermal laser evaporation

Posted by klaurent Caltech

Kavli Affiliate: Austin Minnich | Summary:Thermal laser evaporation is a physical vapor deposition technique of increasing interest because of its ability to evaporate essentially any solid element, even the most refractory such as W. However, many films deposited by this method, especially non-epitaxial films, remain to be characterized; further, key system components such as the […]


Continue.. Characterization of ultrathin nickel films deposited by thermal laser evaporation