Non-linear perturbation theory extension of the Boltzmann code CLASS
  We present a new open-source code that calculates one-loop power auto- and
cross-power spectra for matter fields and biased tracers in real and redshift
space. These spectra incorporate all ingredients required for a direct
application to data: non-linear bias, redshift-space distortions, infra-red
resummation, counterterms, and the Alcock-Paczynski effect. Our code is based
on the Boltzmann solver CLASS and inherits its advantage: user friendliness,
ease of modification, high speed, and simple interface with other software. We
present detailed descriptions of the theoretical model, the code structure,
approximations, and accuracy tests. A typical end-to-end run for one cosmology
takes $\sim 0.3$ seconds, which is sufficient for Markov Chain Monte Carlo
parameter extraction. As an example, we apply the code to data from the Baryon
Oscillation Spectroscopic Survey (BOSS) and infer cosmological parameters from
the shape of the galaxy power spectrum.
