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Depen Morwani

10 accepted papers

2026

Seesaw: Accelerating Training by Balancing Batch Size and Learning Rate Scheduling

ICLR 2026poster

Increasing the batch size during training --- a “batch ramp'' --- is a promising strategy to accelerate large language model pretraining. While for SGD, doubling the batch size can be equivalent to halving the learning rate, the optimal strategy for adaptive optimizers like Adam is less clear. As a…

Cited by 0SourceScholar
2026

The Potential of Second-Order Optimization for LLMs: A Study with Full Gauss-Newton

ICLR 2026poster

Recent efforts to accelerate LLM pretraining have focused on computationally-efficient approximations that exploit second-order structure. This raises a key question for large-scale training: how much performance is forfeited by these approximations? To probe this question, we establish a practical…

Cited by 0SourcecodeScholar
2025

A New Perspective on Shampoo's Preconditioner

ICLR 2025poster

Shampoo, a second-order optimization algorithm that uses a Kronecker product preconditioner, has recently received increasing attention from the machine learning community. Despite the increasing popularity of Shampoo, the theoretical foundations of its effectiveness are not well understood. The pre…

Cited by 11SourcePDFScholar
2025

Deconstructing What Makes a Good Optimizer for Autoregressive Language Models

ICLR 2025poster

Training language models becomes increasingly expensive with scale, prompting numerous attempts to improve optimization efficiency. Despite these efforts, the Adam optimizer remains the most widely used, due to a prevailing view that it is the most effective approach. We aim to compare several optim…

Cited by 0SourcePDFScholar
2025

How Does Critical Batch Size Scale in Pre-training?

ICLR 2025poster

Training large-scale models under given resources requires careful design of parallelism strategies. In particular, the efficiency notion of critical batch size (CBS), concerning the compromise between time and compute, marks the threshold beyond which greater data parallelism leads to diminishing r…

2025

SOAP: Improving and Stabilizing Shampoo using Adam for Language Modeling

ICLR 2025poster

There is growing evidence of the effectiveness of Shampoo, a higher-order preconditioning method, over Adam in deep learning optimization tasks. However, Shampoo's drawbacks include additional hyperparameters and computational overhead when compared to Adam, which only updates running averages of fi…

2024

Beyond Implicit Bias: The Insignificance of SGD Noise in Online Learning

ICML 2024spotlight

The success of SGD in deep learning has been ascribed by prior works to the *implicit bias* induced by finite batch sizes (''SGD noise''). While prior works focused on *offline learning* (i.e., multiple-epoch training), we study the impact of SGD noise on *online* (i.e., single epoch) learning. Thro…

Cited by 3SourcePDFScholar
2024

Feature emergence via margin maximization: case studies in algebraic tasks

ICLR 2024spotlight

Understanding the internal representations learned by neural networks is a cornerstone challenge in the science of machine learning. While there have been significant recent strides in some cases towards understanding *how* neural networks implement specific target functions, this paper explores a c…

Cited by 15SourcePDFScholar
2023

Feature-Learning Networks Are Consistent Across Widths At Realistic Scales

NeurIPS 2023poster

We study the effect of width on the dynamics of feature-learning neural networks across a variety of architectures and datasets. Early in training, wide neural networks trained on online data have not only identical loss curves but also agree in their point-wise test predictions throughout training.…

Cited by 31SourcePDFScholar
2023

Simplicity Bias in 1-Hidden Layer Neural Networks

NeurIPS 2023poster

Recent works have demonstrated that neural networks exhibit extreme *simplicity bias* (SB). That is, they learn *only the simplest* features to solve a task at hand, even in the presence of other, more robust but more complex features. Due to the lack of a general and rigorous definition of *featu…

Cited by 15SourcePDFScholar