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ADADELTA: gradient and update RMS rescaling

Contribution grade

Neural-network optimization · Human-designed research method or resource

Reference score120,000Provisional editorial estimate of this exact contribution; its grade is assessed separately.

What changed

Replaced AdaGrad's unbounded squared-gradient accumulation with a decaying average and used prior-update RMS over gradient RMS to form dimensionally matched coordinate updates.

Scientific scope

Replaced AdaGrad's unbounded squared-gradient accumulation with a decaying average and used prior-update RMS over gradient RMS to form dimensionally matched coordinate updates. Inherits AdaGrad and earlier adaptive-step methods. Original removes a manually set global learning rate but retains decay and numerical-stability hyperparameters; no universal tuning-free or convergence guarantee. The Hessian analogy motivates scaling, not actual exact second-order information or guaranteed optimum.

Evidence

The linked original sources describe the stated contribution and its evidence limits. WRS has not independently rerun the experiments or certified a proof. Inherits AdaGrad and earlier adaptive-step methods. Original removes a manually set global learning rate but retains decay and numerical-stability hyperparameters; no universal tuning-free or convergence guarantee. The Hessian analogy motivates scaling, not actual exact second-order information or guaranteed optimum.

Contributors

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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