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The Whole Paper Fits in One Sigmoid: Implementing the SDAR Gate

The core SDAR mechanism is about fifteen lines of loss code - a detached log-prob gap, a sigmoid gate, and an asymmetric distillation term bolted onto GRPO. Here's the code, where it slots into verl-agent, and the four traps that turn it into a NaN. Part 3 of the series.

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domenica 14 giugno 2026·dev.to
The Whole Paper Fits in One Sigmoid: Implementing the SDAR Gate
The core SDAR mechanism is about fifteen lines of loss code - a detached log-prob gap, a sigmoid gate, and an asymmetric distillation term bolted onto GRPO. Here's the code, where…