Book Image

Modern Computer Vision with PyTorch

By : V Kishore Ayyadevara, Yeshwanth Reddy
5 (1)
Book Image

Modern Computer Vision with PyTorch

5 (1)
By: V Kishore Ayyadevara, Yeshwanth Reddy

Overview of this book

Deep learning is the driving force behind many recent advances in various computer vision (CV) applications. This book takes a hands-on approach to help you to solve over 50 CV problems using PyTorch1.x on real-world datasets. You’ll start by building a neural network (NN) from scratch using NumPy and PyTorch and discover best practices for tweaking its hyperparameters. You’ll then perform image classification using convolutional neural networks and transfer learning and understand how they work. As you progress, you’ll implement multiple use cases of 2D and 3D multi-object detection, segmentation, human-pose-estimation by learning about the R-CNN family, SSD, YOLO, U-Net architectures, and the Detectron2 platform. The book will also guide you in performing facial expression swapping, generating new faces, and manipulating facial expressions as you explore autoencoders and modern generative adversarial networks. You’ll learn how to combine CV with NLP techniques, such as LSTM and transformer, and RL techniques, such as Deep Q-learning, to implement OCR, image captioning, object detection, and a self-driving car agent. Finally, you'll move your NN model to production on the AWS Cloud. By the end of this book, you’ll be able to leverage modern NN architectures to solve over 50 real-world CV problems confidently.
Table of Contents (25 chapters)
1
Section 1 - Fundamentals of Deep Learning for Computer Vision
5
Section 2 - Object Classification and Detection
13
Section 3 - Image Manipulation
17
Section 4 - Combining Computer Vision with Other Techniques

Visualizing the outcome of feature learning

So far, we have learned about how CNNs help us classify images, even when the objects in the images have been translated. We have also learned that filters play a key role in learning the features of an image, which, in turn, help in classifying the image into the right class. However, we haven't mentioned what the filters learn that makes them powerful.

In this section, we will learn about what these filters learn that enables CNNs to classify an image correctly by classifying a dataset that contains images of X's and O's. We will also examine the fully connected layer (flatten layer) to understand what their activations look like. Let's take a look at what the filters learn:

The code for this section is available as Visualizing_the_features'_learning.ipynb in the Chapter04 folder of this book's GitHub repository - https://tinyurl.com/mcvp-packt.
  1. Download the dataset:
!wget https://www.dropbox.com/s/5jh4hpuk2gcxaaq...