Jeremy Howard's video: Lesson 3 - Deep Learning for Coders 2020

NB: We recommend watching these videos through https://course.fast.ai rather than directly on YouTube, to get access to the searchable transcript, interactive notebooks, setup guides, questionnaires, and so forth. Today we finish creating and deploying our own app. We discuss data augmentation, and look at the most important types of augmentation used in modern computer vision models. We also see how fastai helps you process your images to get them ready for your model. We look at building GUIs, both for interactive apps inside notebooks, and also for standalone web applications. We discuss how to deploy web applications that incorporate deep learning models. In doing so, we look at the pros and cons of different approaches, such as server-based and edge-device deployment. Our final area for productionization is looking at what can go wrong, and how to avoid problems, and keep your data product working effectively in practice. Then we skip over to chapter 4 of the book, and learn about the underlying math and code of Stochastic Gradient Descent, which lies at the heart of neural network training. 0:00 - Recap of Lesson 2 + What's next 1:08 - Resizing Images with DataBlock 8:46 - Data Augmentation and item_tfms vs batch_tfms 12:28 - Training your model, and using it to clean your data 18:07 - Turning your model into an online application 36:12 - Deploying to a mobile phone 38:13 - How to avoid disaster 50:59 - Unforeseen consequences and feedback loops 57:20 - End of Chapter 2 Recap + Blogging 1:04:09 - Starting MNIST from scratch 1:06:58 - untar_data and path explained 1:10:57 - Exploring at the MNIST data 1:12:05 - NumPy Array vs PyTorch Tensor 1:16:00 - Creating a simple baseline model 1:28:38 - Working with arrays and tensors 1:30:50 - Computing metrics with Broadcasting 1:39:46 - Stochastic Gradient Descent (SGD) 1:54:40 - End-to-end Gradient Descent example 2:01:56 - MNIST loss function 2:04:40 - Lesson 3 review