n.稀疏；稀少

Because the data it used was not users' rating but users' browse route, the problem of data sparseness and initial rating was resolved. 由于數(shù)據(jù)不是簡單的用戶評分，而是用戶瀏覽網(wǎng)頁的路徑，這樣就解決了數(shù)據(jù)稀疏問題和最初評價問題。

Based on the clustering method, the mixing matrix was first estimated by a new potential function using the sparseness of sources. 首先，利用變換后信源的稀疏特征，采用一新的勢函數(shù)通過聚類算法估計混疊矩陣。