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test-time adaptation
also TTA or source-free test-time adaptation
Definition of test-time adaptation
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: a family of methods that adjust a trained model, its internal statistics, or its predictions while it is being used on new data so it can better handle a changed target environment
- The vision system used test-time adaptation when weather conditions differed from its training images.
- Before enabling TTA in production, the team tested whether noisy batches could push the model in the wrong direction.
Two meanings, one word
In everyday English
Adaptation is a change that makes something better suited to new conditions.
In AI
A family of methods that adjust a trained model, its internal statistics, or its predictions while it is being used on new data so it can better handle a changed target…
Origin & history
Adapting models after deployment has older roots, but test-time adaptation became a standard category name around 2020 through work such as Tent, short for fully test-time adaptation by entropy minimization. The literature expanded rapidly as researchers studied source-free and continual variants.
Test yourself
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Cite this entry
"Test-time adaptation." AI Dictionary, Dadgogo, https://dadgogo.com/dictionary/test-time-adaptation/. Accessed 7 Oct. 2026.