کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
531620 | 869860 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Non-stationary data sequence classification using online class priors estimation
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی کامپیوتر
چشم انداز کامپیوتر و تشخیص الگو
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Online classification is important for real time data sequence classification. Its most challenging problem is that the class priors may vary for non-stationary data sequences. Most of the current online-data-sequence-classification algorithms assume that the class labels of some new-arrived data samples are known and retrain the classifier accordingly. Unfortunately, such assumption is often violated in real applications. But if we were able to estimate the class priors on the test data sequence accurately, we could adjust the classifier without retraining it while preserving a reasonable accuracy. There has been some work on the class priors estimation to classify static data sets using the offline iterative EM algorithm, which has been proved to be quite effective to adjust the classifier. Inspired by the offline iterative EM algorithm for static data sets, in this paper, we propose an online incremental EM algorithm to estimate the class priors along the data sequence. The classifier is adjusted accordingly to keep pace with the varying distribution. The proposed online algorithm is more computationally efficient because it scans the sequence only once. Experimental results show that the proposed algorithm indeed performs better than the conventional offline iterative EM algorithm when the class priors are non-stationary.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Pattern Recognition - Volume 41, Issue 8, August 2008, Pages 2656-2664
Journal: Pattern Recognition - Volume 41, Issue 8, August 2008, Pages 2656-2664
نویسندگان
Chunyu Yang, Jie Zhou,