Billy Don't Be a Hero blue, and "riding out" (cavalry) refer to the American Civil War. However the drum beat and cavalry "riding out" is not specific to the American Civil War, and blue uniforms were common in the 19th century. That being said, Paper Lace themselves performed the song on "Top of the Pops" wearing Union-style uniforms, as can be seen on YouTube. A young woman is distraught that her fiancé chooses to enlist with Army recruiters passing through the town, causing her to implore him: The song goes on to describe how Billy is killed in action in a pitched battle after volunteering
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