منابع مشابه
Learning Sparsely Used Overcomplete Dictionaries
We consider the problem of learning sparsely used overcomplete dictionaries, where each observation is a sparse combination of elements from an unknown overcomplete dictionary. We establish exact recovery when the dictionary elements are mutually incoherent. Our method consists of a clustering-based initialization step, which provides an approximate estimate of the true dictionary with guarante...
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Learning word embeddings on large unlabeled corpus has been shown to be successful in improving many natural language tasks. The most efficient and popular approaches learn or retrofit such representations using additional external data. Resulting embeddings are generally better than their corpus-only counterparts, although such resources cover a fraction of words in the vocabulary. In this pap...
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Vehicle dynamics is typically handled by models whose parameters are found through system identification or manually computed from the vehicle’s characteristics. While these methods provide accurate theoretical dynamical models, they may not take into account differences between individual vehicles, lack adaptability to new environments and may not handle sophisticated models, requiring hand-cr...
متن کاملJoint Dictionaries for Zero-Shot Learning
A classic approach toward zero-shot learning (ZSL) is to map the input domain to a set of semantically meaningful attributes that could be used later on to classify unseen classes of data (e.g. visual data). In this paper, we propose to learn a visual feature dictionary that has semantically meaningful atoms. Such dictionary is learned via joint dictionary learning for the visual domain and the...
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Sparsity as a powerful instrument in signal processing is now commonplace. However, it is also well known that certain classes of signals do not admit a sparse expansion in an orthonormal basis (e.g., a mixture of spikes and sinuoids is non-sparse in either the canonical or Fourier basis). Therefore, it is typical to use an overcomplete basis, or a redundant dictionary, for representing such co...
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ژورنال
عنوان ژورنال: IEEE Transactions on Image Processing
سال: 2007
ISSN: 1057-7149
DOI: 10.1109/tip.2007.901813