feat: WeakDataset catalog IO + reduced shear (weak series step 7a) - #589
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Real-catalogue interface for the weak-lensing series (phase 7a of #588): - WeakDataset.from_arrays / to_csv / from_csv (columns name,y,x,gamma_2, gamma_1,noise[,redshift]) and from_fits (binary table, explicit column mapping, hdu select) — loaders default is_reduced=True since real catalogues measure ellipticities (reduced shear) - weights= alternative to noise_map on all loaders (sigma = w**-0.5) - Optional per-galaxy redshifts stored for provenance / future sigma_crit scaling (single-effective-source-plane remains the fit assumption) - Reduced shear g = gamma/(1-kappa): SimulatorShearYX(reduced=True) simulates it (convergence via the same Hessian dispatch), WeakDataset.is_reduced declares it, FitWeak computes the matching model quantity - 7 new tests: loader validation, csv/fits/json round trips, weights conversion, reduced round-trip + mislabel guard Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
Real-catalogue interface for the weak-lensing series (phase 7a of #588):
WeakDataset.from_arrays/to_csv/from_csv/from_fits(FITS binary tables with explicit column mapping), inverse-varianceweights=(σ = w^(−1/2)), optional per-galaxy source-redshift storage, and end-to-end reduced shear —SimulatorShearYX(reduced=True)simulates g = γ/(1−κ),WeakDataset.is_reduceddeclares it,FitWeakcomputes the matching model quantity via the same Hessian primitive. Loaders defaultis_reduced=True(real catalogues measure ellipticities); the simulator defaults to plain γ, matching the earlier tutorials.API Changes
Added only — no existing symbol removed, renamed or changed;
WeakDataset.__init__gains optionalredshifts=/is_reduced=(defaults preserve existing behaviour and JSON round-trips).al.WeakDataset.from_arrays / to_csv / from_csv / from_fitsal.SimulatorShearYX(reduced=)See full details in the issue plan (feat: weak lensing real-data support — catalog IO, reduced shear, A2744 (weak series step 7) #588).
Test Plan
test_autolens/suite: 364 passed (48 weak, 7 new).Validation checklist (--auto run)
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