PyMC3 has been renamed PyMC about exoplanet

[dfm]

Yeah - exoplanet does not work with PyMC v4. You'll need to stick with PyMC3!

[dfm]

Great question and this is a good place to ask!

So far, I have updated all the backend packages (exoplanet-core, and celerite2) to be compatible with PyMC v4. This means that in principle it shouldn't be too hard to get the main package updated, but I haven't had the bandwidth to work on it!

For my own work, I've mostly been hacking on the JAX implementation (which is really more of a separate project, name TBD :D), but I definitely want to make sure that this package stays up to date. Maybe it makes sense to open a separate issue or PR to track these changes...

[catrionamurray]

Hi! I'm trying to use exoplanet with PyMC (v4) and I'm having trouble with defining the limb-darkening coeffs:
u_ld = xo.distributions.QuadLimbDark("u", testval=np.array(init_u))
Throws an error when defined under pm.Model() where pm is pyMC not pyMC3.

---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
~/opt/anaconda3/envs/py38/lib/python3.8/site-packages/pymc3/model.py in get_context(cls, error_if_none)
    320         try:
--> 321             candidate = cls.get_contexts()[-1]  # type: Optional[T]
    322         except IndexError as e:

IndexError: list index out of range

During handling of the above exception, another exception occurred:

TypeError                                 Traceback (most recent call last)
~/opt/anaconda3/envs/py38/lib/python3.8/site-packages/pymc3/distributions/distribution.py in __new__(cls, name, *args, **kwargs)
     85         try:
---> 86             model = Model.get_context()
     87         except TypeError:

~/opt/anaconda3/envs/py38/lib/python3.8/site-packages/pymc3/model.py in get_context(cls, error_if_none)
    325             if error_if_none:
--> 326                 raise TypeError("No %s on context stack" % str(cls))
    327             return None

TypeError: No <class 'pymc3.model.Model'> on context stack

During handling of the above exception, another exception occurred:

TypeError                                 Traceback (most recent call last)
/var/folders/6k/5j78gjkn74b4xb382c27jzwr0000gn/T/ipykernel_64514/3843441120.py in <module>
     17 
     18 # fit MCMC transit
---> 19 map_soln, model,[period,r,t0,b_ip,u_ld,mean] = fit_transit(x,y,yerr,init_r,init_t0, init_period,init_b,init_mean,init_u,period_error)
     20 # plot the fit
     21 plot_fit(x,y,yerr,map_soln)

~/Documents/Postdoc/CUBoulder/chromatic_fitting/src/recover_transit.py in fit_transit(x, y, yerr, init_r, init_t0, init_period, init_b, init_mean, init_u, period_error, fixed_var)
     86             u_ld = xo.distributions.QuadLimbDark("u", testval=np.array(init_u), observed=np.array(init_u))
     87         else:
---> 88             u_ld = xo.distributions.QuadLimbDark("u", testval=np.array(init_u))
     89 
     90         #         r = pm.Uniform(

~/opt/anaconda3/envs/py38/lib/python3.8/site-packages/pymc3/distributions/distribution.py in __new__(cls, name, *args, **kwargs)
     86             model = Model.get_context()
     87         except TypeError:
---> 88             raise TypeError(
     89                 "No model on context stack, which is needed to "
     90                 "instantiate distributions. Add variable inside "

TypeError: No model on context stack, which is needed to instantiate distributions. Add variable inside a 'with model:' block, or use the '.dist' syntax for a standalone distribution. 

[vandalt]

Hi, I'm not sure this is the best place to ask my question (sorry if it's not). I was wondering if there were plans to make exoplanet compatible with PyMC v4 or if the JAX backend (exo4jax I think?) was the main path forward in the future?

Thank you!

[dfm]

Quick update here that I'm working on the update to pymc v4 over here: #271