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2026-10-24

AWS Machine Learning Blog01:48

Amazon SageMaker AI has launched a Multi-Step Reinforcement Learning (MTRL) framework, supporting end-to-end training of agents to accomplish multi-step tasks.

AWS has launched the Multi-Turn Reinforcement Learning (MTRL) feature, enabling users to train large‑model agents on SageMaker AI using full task trajectories and final outcome feedback, without requiring step‑level annotations. A end-to-end demonstration is provided using Wordle as an example, covering AgentCore deployment, data preparation, GRPO training, reward design, and cost analysis.

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2026-10-22

Google Research00:23

AI-assisted “blind-scan” ultrasound technology supports maternal and child health care at the grassroots level: A multi-center, prospective study validates its cross-regional generalizability.

Google’s research team, in collaboration with clinical institutions, conducted a prospective multicenter study that demonstrated an AI‑driven “blind‑scan” ultrasound protocol—using low‑cost, portable probes operated by non‑ultrasound specialists—achieved gestational age assessment accuracy comparable to expert‑level ultrasonic biometry in both Chicago and Nairobi (mean absolute error of 4.18 days vs. 4.48 days), without requiring local data fine‑tuning. This offers a viable pathway to expand prenatal ultrasound coverage in resource‑limited settings.

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2026-10-21

NVIDIA Blog18:45

Google Cloud and NVIDIA have announced the official commercial availability of the NVIDIA Vera Rubin infrastructure: A5X instances are now live, focusing on large-scale reinforcement learning and agent reasoning.

Google Cloud and NVIDIA have announced that the A5X instances, built on the Vera Rubin architecture, will officially go commercial starting next month, initially available in the United States and later expanding to Europe. The platform integrates NVL72 GPUs, ConnectX-9 SuperNICs, the Virgo network, and fourth-generation liquid cooling technology, and is specifically designed for high-density computing workloads such as large-scale reinforcement learning and generative agent inference.

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AWS Machine Learning Blog01:48

GPT-OSS-20B Multilingual Reasoning Fine-Tuning Experiment: SFT Enables Zero-Base Behavior Acquisition, while GRPO Only Effectively Improves Performance When a Probabilistic Headspace Exists

The AWS team conducted multilingual inference fine-tuning experiments on Amazon SageMaker HyperPod using GPT‑OSS‑20B, employing LoRA for parameter-efficient fine-tuning. SFT boosted the correctness rate of inference in five languages (English, French, German, Spanish, and Italian) from 22% to 100%, though the correctness rate for the answer language remained at only 62%. GRPO further improved the answer-language correctness rate to 70% without compromising inference-language performance; however, the gains varied across languages—for example, Spanish saw a +30 percentage-point increase, while Italian experienced a -20 percentage-point decline. The experiments clearly demonstrated that GRPO cannot bootstrap new capabilities from scratch and can only optimize behaviors that already occur sporadically.

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