Search Results for author: Heinrich Matzinger

Found 6 papers, 0 papers with code

Recover the spectrum of covariance matrix: a non-asymptotic iterative method

no code implementations1 Jan 2022 Juntao Duan, Ionel Popescu, Heinrich Matzinger

It is well known the sample covariance has a consistent bias in the spectrum, for example spectrum of Wishart matrix follows the Marchenko-Pastur law.

Invariance principle of random projection for the norm

no code implementations1 Dec 2021 Juntao Duan, Ionel Popescu, Heinrich Matzinger

In particular we prove the distribution of the norm of random vector $X \in \mathbb{R}^n$, whose entries are i. i. d.

Centroid estimation based on symmetric KL divergence for Multinomial text classification problem

no code implementations29 Aug 2018 Jiangning Chen, Heinrich Matzinger, Haoyan Zhai, Mi Zhou

We define a new method to estimate centroid for text classification based on the symmetric KL-divergence between the distribution of words in training documents and their class centroids.

General Classification text-classification +1

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