log_abs_det_jacobian will be recalculated when necessary
#2384
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This PR fixes a potential pitfall for bugs! Several of the transforms rely on cached values to calculate the log(abs(det(Jacobian))). However, you can call the
log_abs_det_jacobianmethod with any inputsx,yyou'd like, and if they don't match the values for the cached Jacobian then the wrong Jacobian is returned.My solution is to compare
x,yto the values that were used to calculate the Jacobian. If they don't match then the Jacobian is recached