Comparison of denoised spectra given by RBM and PCA. The denoised spectra are obtained by using 1000 RBM components or PCs. The left panels show the results on stellar spectra, the middle panels show the results on galaxy spectra, and the right panels show the results on QSOs spectra. The figures show that in the denoising procedure PCA is more efficient at recovering the narrow line features, while RBM can better recover the broadband features. This indicates that RBM can be used to process the spectra with broadband features, such as the spectra of late-type stars. We have used other numbers of components to denoise spectra and find that the difference between these results is negligible.
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