Domain Adaptation and Generalization
Domain adaptation is a subfield of transfer learning focused on adapting models trained in one domain to perform well in another, related domain.
In domain adaptation, you work with a source domain, where you have labeled data and possibly a well-performing model, and a target domain, where the data distribution differs, and labels might be scarce or unavailable. The central idea is to bridge the gap between these domains so that knowledge gained in the source can be effectively transferred to the target.
One common approach in domain adaptation is domain mapping, which is often represented mathematically as
f:DSββDTβHere, DSβ stands for the source domain and DTβ for the target domain. The function f aims to transform or align features from the source domain to make them more similar to those in the target domain. The ultimate goal is to minimize the difference between the source and target data distributions, so that a model trained on the source can generalize well to the target.
Generalization is a fundamental concept in machine learning and transfer learning. It refers to the ability of a model to perform well on unseen data, especially from the target domain.
You improve generalization in transfer learning by using features shared between source and target domains, especially when labeled data is limited in the target. For instance, you might train a handwriting recognizer on English samples, then adapt it to French, where letter forms and accents differ. The bigger the difference between domainsβsuch as handwriting stylesβthe harder it is for the model to adapt and generalize without losing accuracy.
Techniques like feature alignment and adversarial training are often used to improve domain adaptation.
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Domain adaptation is a subfield of transfer learning focused on adapting models trained in one domain to perform well in another, related domain.
In domain adaptation, you work with a source domain, where you have labeled data and possibly a well-performing model, and a target domain, where the data distribution differs, and labels might be scarce or unavailable. The central idea is to bridge the gap between these domains so that knowledge gained in the source can be effectively transferred to the target.
One common approach in domain adaptation is domain mapping, which is often represented mathematically as
f:DSββDTβHere, DSβ stands for the source domain and DTβ for the target domain. The function f aims to transform or align features from the source domain to make them more similar to those in the target domain. The ultimate goal is to minimize the difference between the source and target data distributions, so that a model trained on the source can generalize well to the target.
Generalization is a fundamental concept in machine learning and transfer learning. It refers to the ability of a model to perform well on unseen data, especially from the target domain.
You improve generalization in transfer learning by using features shared between source and target domains, especially when labeled data is limited in the target. For instance, you might train a handwriting recognizer on English samples, then adapt it to French, where letter forms and accents differ. The bigger the difference between domainsβsuch as handwriting stylesβthe harder it is for the model to adapt and generalize without losing accuracy.
Techniques like feature alignment and adversarial training are often used to improve domain adaptation.
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