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Friday, 13 March 2026

Identifying Interactions at Scale for LLMs

BAIR 4 months ago

Researchers developed SPEX and ProxySPEX, algorithms that efficiently identify influential feature interactions in large language models by leveraging sparsity and hierarchical properties to reduce computational costs from exponential to tractable levels. ProxySPEX achieves the same performance as SPEX with approximately 10 times fewer ablations required. The methods enable new applications in feature attribution, data attribution, and mechanistic interpretability across different scales of model analysis, with code made available in the SHAP-IQ repository.

LWiAI Podcast #236 - GPT 5.4, Gemini 3.1 Flash Lite, Supply Chain Risk

Last Week in AI 4 months ago 2 sources

OpenAI released GPT-5.4 Pro with a 1M-token context window and improved capabilities, while Google upgraded Gemini 3.1 Flash Lite with faster performance and agent integration tools for Gmail and Drive. Key announcements included Luma's multimodal AI agents completing a creative project in 40 hours for under $20,000 and OpenAI securing $110B in funding at a $730B valuation. Defense contracting controversies, consumer backlash, leadership departures at major AI companies, and ongoing policy debates around AI military applications and safety standards defined the broader landscape.

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