Example sampler

[humnaawan]

Hi, so in my effort to get LSSLike to work, I am trying to get the example emcee sampler code to work. When I just try to read in the sim_sample/sims/sim_mean.sacc file, I get an error saying KeyError: "Unable to open object (object 'meta' doesn't exist)", which I assume is arising from a SACC incompatibility.

I then attempted to recreate the sims files using mk_sims.py. After a bit of work, I got it to create a sim_mean.sacc file (though not the rest of them .. yet). While I am able to read the new file, CCL throws an error saying

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-54-7e2c81c37fa2> in <module>
      6 p0[i_b2] = 1.0
      7 p0[i_b3] = 1.0
----> 8 print("This should be a small number: %lE"%(logprob(p0,lk)))

<ipython-input-51-740aec220aed> in logprob(p, lk)
     12                             p[i_b0],p[i_b1],p[i_b2],p[i_b3],
     13                             1.0]})
---> 14     cls=lt.get_prediction(dic)
     15     return lk(cls)

~/LSST/lsstRepos/LSSLike/desclss/lss_theory.py in get_prediction(self, dic_par)
     74         theory_out=np.zeros((self.s.size(),))
     75         cosmo=self.get_cosmo(dic_par)
---> 76         tr=self.get_tracers(cosmo,dic_par)
     77         for i1,i2,_,ells,ndx in self.s.sortTracers() :
     78             cls=ccl.angular_cl(cosmo,tr[i1],tr[i2],ells)

~/LSST/lsstRepos/LSSLike/desclss/lss_theory.py in get_tracers(self, cosmo, dic_par)
     33                                                        z = thistracer.z, n=(zbins, thistracer.Nz), bias = (z_b_arr, b_b_arr)))
     34             else :
---> 35                 raise ValueError("Only \"point\" tracers supported")
     36         return tr_out
     37 

ValueError: Only "point" tracers supported

I'd appreciate some insight into whats going wrong. At this point, I am basically trying to get a SACC object that actually works with LSSLike, and then I can proceed with creating the objects for my own analysis.