Today’s pick is Learning Length-Extrapolatable Recurrent Models. The problem is simple to state and hard to solve: recurrent networks can, in principle, process arbitrarily long sequences, but models trained on short contexts often fall apart when you ask them to run much longer than they’ve seen before. The usual story blames vanishing or exploding gradients, but this paper argues that the deeper issue is how future losses send credit back to earlier hidden states. The authors introduce Credit Stabilization through Time, or CST, a backward-pass intervention that rescales this credit signal to keep it numerically stable without changing the forward computation. That means the model learns the same way at training time, but gets a better-behaved learning signal. The result is striking: on both synthetic tasks and real data, the method improves performance far beyond the training horizon, in some cases up to 128 times longer. For anyone interested in long-context AI, this is a practical step toward recurrent models that truly extrapolate.
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