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cs.LG2016★ 2 cited
Word2Vec is a special case of Kernel Correspondence Analysis and Kernels for Natural Language Processing
Hirotaka Niitsuma, Minho Lee
We show that correspondence analysis (CA) is equivalent to defining a Gini index with appropriately scaled one-hot encoding. Using this relation, we introduce a nonlinear kernel ex…
cs.LG2007★ 1 cited
Covariance and PCA for Categorical Variables
Hirotaka Niitsuma, Takashi Okada
Covariances from categorical variables are defined using a regular simplex expression for categories. The method follows the variance definition by Gini, and it gives the covarianc…