Billy Don't Be a Hero Billy Don't Be a Hero "Billy Don't Be a Hero" is a 1974 pop song that was first a UK hit for Paper Lace and then, some months later, a US hit for Bo Donaldson and The Heywoods. The song was written and composed by two British songwriters, Mitch Murray and Peter Callander. Because the song was released in 1974, it was associated by some listeners with the Vietnam War, though the war to which it actually refers is never identified in the lyrics. It has been suggested that the drum pattern, references to a marching band leading soldiers in
Determining the number of clusters in a data set m by n, m: number of documents, n: number of terms) number of clusters can roughly be estimated by the following formula formula_12 where t is the number of non-zero entries in D. Note that in D each row and each column must contain at least one non-zero element. Kernel matrix defines the proximity of the input information. For example, in Gaussian Radial basis function, determines the dot product of the inputs in a higher-dimensional space, called feature space. It is believed that the data become more linearly separable in the feature space, and hence, linear algorithms can be applied