Open Access
Table 1
Operation schemes of the code, sorted by increasing computational complexity.
| Operating scheme | Inversion of the lens equation | Source position | Other source parameters | Notes |
|---|---|---|---|---|
| Source plane | None | Marginalized | Marginalized | Cannot discover new images |
| Fast image plane | Required | Marginalized | Marginalized | Laplace’s approximation |
| Standard image plane | Required | Free | Marginalized | Exact marginalization |
| Full image plane | Required | Free | Free | Rarely needed |
Notes. Gravity.jl allows the user to choose the operating scheme, and to take advantage of results obtained by a simpler scheme to speed up the inference process in a more complex one through the use of the reference distribution (see Sect. 2.2.1).
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