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Progress in natural language processing research is catalyzed by the possibilities given by the widespread software frameworks. This paper introduces AdaptOr library 1 that transposes the traditional model-centric approach composed of pre-training + fine-tuning steps to objective-centric approach, composing the training process by applications of selected objectives. We survey research directions that can benefit from enhanced objective-centric experimentation in multitask training, custom objectives development, dynamic training curricula, or domain adaptation. AdaptOr aims to ease reproducibility of these research directions in practice. Finally, we demonstrate the practical applicability of AdaptOr in selected unsupervised domain adaptation scenarios."The measure of intelligence is the ability to change."-Albert Einstein

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