Articles by category: deep-learning

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BERT, Part 3: BERT

23 Jun 2019

BERTIn the last two posts, we reviewed Deep Learning and The Transformer. Now we can discuss an interesting advance in NLP, BERT, Bidirectional Encoder Representations from Transformers (arxiv link).BERT is a self-supervised method, which uses just a large set of unlabeled textual data to learn representations broadly applicable for different language tasks.At a high level, BERT’s pre-training objective, which is what’s used to get its parameters, is a Language modelling (LM) problem. LM is a... Read More

BERT Prerequisite 2: The TransformerIn the last post, we took a look at deep learning from a very high level (Part 1). Here, we’ll cover the second and final prerequisite for setting the stage for discussion about BERT, the Transformer.The Transformer is a novel sequence-to-sequence architecture proposed in Google’s Attention is All You Need paper. BERT builds on this significantly, so we’ll discuss here why this architecture was important.The ChallengeRecall the language of the previous post... Read More

A Modeling Introduction to Deep LearningIn this post, I’d like to introduce you to some basic concepts of deep learning (DL) from a modeling perspective. I’ve tended to stay away from “intro” style blog posts because: There are so, so many of them. They’re hard to keep in focus.That said, I was presenting on BERT for a discussion group at work. This was our first DL paper, so I needed to warm-start a technical audience with a no-frills intro to modeling with deep nets. So here we are, tryin... Read More

Deep Learning Learning PlanThis is my plan to on-board myself with recent deep learning practice (as of the publishing date of this post). Comments and recommendations via GitHub issues are welcome and appreciated! This plan presumes some probability, linear algebra, and machine learning theory already, but if you’re following along Part 1 of the Deep Learning book gives an overview of prerequisite topics to cover.My notes on these sources are publicly available, as are my experiments. Intro... Read More

Non-convex First Order MethodsThis is a high-level overview of the methods for first order local improvement optimization methods for non-convex, Lipschitz, (sub)differentiable, and regularized functions with efficient derivatives, with a particular focus on neural networks (NNs).\[\argmin_\vx f(\vx) = \argmin_\vx \frac{1}{n}\sum_{i=1}^nf_i(\vx)+\Omega(\vx)\]Make sure to read the general overview post first. I’d also reiterate as Moritz Hardt has that one should be wary of only looking at con... Read More

Neural Network Optimization MethodsThe goal of this post and its related sub-posts is to explore at a high level how the theoretical guarantees of the various optimization methods interact with non-convex problems in practice, where we don’t really know Lipschitz constants, the validity of the assumptions that these methods make, or appropriate hyperparameters. Obviously, a detailed treatment would require delving into intricacies of cutting-edge research. That’s not the point of this post, w... Read More