Use interpax.interp1d to support non-monotonic temperature evolution (reheating)#16
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Use interpax.interp1d to support non-monotonic temperature evolution (reheating)#16
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Replace jnp.interp with interpax.interp1d in abundances.py, nuclear.py, and weak_rates.py to support reheating scenarios where photon temperature may not be monotonically decreasing. jnp.interp requires monotonically increasing x-coordinates, which breaks when T_g_vec is non-monotonic (e.g., during reheating where temperature can increase before decreasing again). The fix sorts arrays by the x-coordinate before interpolation. Changes: - Add interpax dependency to requirements.txt - abundances.py: Sort by log(T_g) for a_start, t_start, t_end interpolations and by log(rho_tot) for P_tot interpolations in get_t/get_a - weak_rates.py: Sort by Tg for neutrino-to-photon temperature ratio lookup - nuclear.py: Sort by T_interval for weak rate interpolations Note: thermo.py and reactions.py are unchanged as they use pre-tabulated data that is guaranteed to be monotonic. Closes #15 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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This looks great to me, thank you @smsharma ! I'm even seeing a ~25% speedup on M1 Mac (haven't tested other hardware yet)--with that in mind we should probably replace the jnp.interp's in thermo too, I see no reason not to. Passes the abundance test so I'm happy to merge pending @hongwanliu 's review. |
cgiovanetti
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Significant performance enhancement from interp1d over jnp.interp!
I'd hoped interp1d could take non-monotonic functions given their docs, but it seems like they just left that detail out; the sorting is a nice fix. Since we can still pass in T_g in any order we like this does not affect code output.
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Gonna merge in! |
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Follow-up to PR #16 which replaced jnp.interp with interpax in abundances.py. This change applies the same improvement to thermo.py for consistency and better performance. Changes: - Import interpax module - Flip QED correction tables at load time (instead of at each call) for monotonically increasing x coordinates required by interpax - Replace 6 jnp.interp calls with interpax.interp1d: - rho_EM_std: 2 calls for QED corrections - p_EM_std: 1 call for QED correction - rho_plus_p_EM_std: 1 call for QED correction - G_nue_with_me: 1 call for collision factor interpolation - G_numt_with_me: 1 call for collision factor interpolation Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
jnp.interpwithinterpax.interp1dinabundances.py,nuclear.py, andweak_rates.pyto support reheating scenarios where photon temperature may not be monotonically decreasingthermo.pyandreactions.pyare unchanged as they use pre-tabulated monotonic dataProblem
jnp.interprequires monotonically increasing x-coordinates, which breaks whenT_g_vecis non-monotonic (e.g., during reheating where temperature can increase before decreasing again). The previous code usedjnp.flip()assuming temperature always decreases, which doesn't work for reheating.Solution
Use
interpax.interp1dwith sorted arrays:interpax.interp1dwithmethod='linear'andextrap=TrueTest plan
pytest/test_abundances.py)cc @cgiovanetti (as requested)
Closes #15
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