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When you post-train a Mixture-of-Experts (MoE) model with Reinforcement Learning from Human Feedback (RLHF) or Group Relative Policy Optimization (GRPO) at scale, three simultaneous challenges emerge... The first requires coordinating heterogeneous compute for rollout generation and policy training... However, sparsity doesn’t remove infrastructure complexity in training... As part of the standa...

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Reinforcement learning (RL) post-training is becoming a standard step in building capable language model agents... Running this at scale, across multiple nodes with hundreds of GPU-hours of rollouts per training run, requires persistent cluster infrastructure... That infrastructure needs to sustain long jobs, recover from hardware failures without losing progress, and provide visibility into train...

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Real-Time Streaming Evaluation validates each paragraph the moment it’s produced, overlapping quality checks with generation... The Composite Evaluation Framework runs multiple independent evaluators in parallel against each paragraph... Paragraph independence Validating output paragraph N does not require waiting for paragraph N+1 to be generated... In a sequential pipeline, users wait for all...

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Treasury yields continued to rise on Thursday, reaching new multi-decade highs...This relatively weak performance in recent weeks highlights a growing gap versus the broad market, a gap that’s likely to widen if Treasury yields continue to rise... Several factors are driving the bond market’s repricing of yields, including inflation expectations, uncertainty surrounding the Iran conflict, co...

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Organizations building event-driven applications on Amazon EventBridge typically start with a single custom event bus in one account... To route events between them, teams create multiple event buses connected through cross-account rules or bus-to-bus configurations... Platform teams lose visibility into who is subscribing to which events, cross-account and bus-to-bus routing charges compound quic...

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You deploy it to an Amazon SageMaker AI real-time or asynchronous endpoint without building a custom image... In this post, we show how to deploy both endpoint types and when to choose each... Request format: The endpoint expects multipart/form-data, with the audio as the file part plus optional string fields such as language, diarize, and response_format... Output formats: json, verbose_json, ...

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Enterprises increasingly want AI agents that can reason over data spread across many AWS accounts without copying or centralizing it... But an agent that sees only one account’s data delivers limited value, and connecting it to distributed sources usually means replicating data or untangling cross-account AWS Identity and Access Management (IAM)... In this post, you build a multi-account archite...