MullOverThings

Useful tips for everyday

# Why deep metric learning?

## Why deep metric learning?

In recent years, Metric/Distance learning using Deep learning has been shown to output highly satisfying results for many computer vision tasks such as face recognition, face verification, image classification, Anomaly detection, etc. Metric Learning only has a limited capability to capture non-linearity in the data.

## Is that you metric learning approaches for face identification?

Confidence scores obtained for face identification can be used for many applications e.g. clustering or recognition from a single training example. We show that our learned metrics also improve performance for these tasks.

## Why metric learning?

The goal of Metric Learning is to learn a representation function that maps objects into an embedded space. The distance in the embedded space should preserve the objects’ similarity — similar objects get close and dissimilar objects get far away. Various loss functions have been developed for Metric Learning.

## What is distance metric learning?

Distance metric learning is a branch of machine learning that aims to learn distances from the data, which enhances the performance of similarity-based algorithms. This tutorial provides a theoretical background and foundations on this topic and a comprehensive experimental analysis of the most-known algorithms.

## Is metric learning supervised?

Distance metric learning (or simply, metric learning) aims at automatically constructing task-specific distance metrics from (weakly) supervised data, in a machine learning manner. The learned distance metric can then be used to perform various tasks (e.g., k-NN classification, clustering, information retrieval).

## What is Hamming distance in machine learning?

Hamming Distance measures the similarity between two strings of the same length. The Hamming Distance between two strings of the same length is the number of positions at which the corresponding characters are different.

## What is Euclidean distance in machine learning?

Euclidean distance calculates the distance between two real-valued vectors. You are most likely to use Euclidean distance when calculating the distance between two rows of data that have numerical values, such a floating point or integer values.

## How does metric learning improve the scalability of a model?

Fig.1 Given two images of a chair and table, the idea of metric learning is to quantify the image similarity using an appropriate distance metric. When we aim to differentiate the objects and not to recognize them, it improves the model scalability to a great extent as we are no longer dependent on a class given image belongs to.

## How is metric learning used in image similarity search?

Metric learning aims to train models that can embed inputs into a high-dimensional space such that “similar” inputs, as defined by the training scheme, are located close to each other.

## How does deep metric learning improve object recognition?

When we aim to differentiate the objects and not to recognize them, it improves the model scalability to a great extent as we are no longer dependent on a class given image belongs to. To alleviate these issues, de e p learning and metric learning collectively form the concept of Deep Metric Learning (DML), also known as Distance Metric Learning.

## How are training data related in metric learning?

Metric learning provides training data not as explicit (X, y) pairs but instead uses multiple instances that are related in the way we want to express similarity. In our example we will use instances of the same class to represent similarity; a single training instance will not be one image, but a pair of images of the same class.