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feat(vf): implement transform_to_unconstrained z-scoring for vector field estimators#1890

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feat(vf): implement transform_to_unconstrained z-scoring for vector field estimators#1890
BHARATH0153 wants to merge 1 commit into
sbi-dev:mainfrom
BHARATH0153:vf-estimators

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@BHARATH0153

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Vector field estimator portion of the transform_to_unconstrained feature (split from #1888).

6 files changed (no MDN changes):

  • ConditionalVectorFieldEstimator: add prior_transform property
  • FlowMatchingEstimator: apply transform in ode_fn() and loss()
  • ScoreEstimator (ConditionalScore, VP, SubVP, VE): same pattern
  • VectorFieldBasedPotential: transform theta, add log|det J| correction
  • VectorFieldPosterior: sample paths inverse-transform
  • build_vector_field_estimator: wire mcmc_transform, add x_dist param

Closes #1885 (vector field portion).

@BHARATH0153

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@janfb as you said removed vector field and just opened for referal thanks!

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bug: transform_to_unconstrained z-scoring is a silent no-op for nflows flows

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