ximinf

Simulation-Based Inference of Cosmological Parameters in JAX using Type Ia Supernovae.

ximinf is a Python package for performing simulation-based inference (SBI) on cosmological parameters using type Ia supernova (SN Ia) data, built on top of JAX for fast, differentiable, and GPU/TPU-accelerated computation.

Installation

pip install ximinf

Requires Python >= 3.10.

Quickstart

import ximinf

See the documentation for full usage examples covering simulation, training, and inference.

Features

ximinf is organized into five core modules:

ximinf.generate_sim — Generates simulated SN Ia datasets. Includes Latin Hypercube Sampling (LHS) of cosmological/nuisance parameters under configurable priors (uniform, gaussian, half-gaussian, log-uniform, exponential, etc.), and per-dataset simulation via skysurvey.
ximinf.selection_effects — Tools for injecting realistic observational selection effects (e.g. Malmquist bias) into simulated supernova samples via stochastic magnitude-limited detection.
ximinf.nn_train — Training utilities for the neural network classifiers used in the inference step, including loss/accuracy functions, training/validation loops with early stopping, and JAX device setup helpers.
ximinf.nn_test — Diagnostics for validating inference quality, notably TARP (Tests of Accuracy with Random Points) coverage statistics computed across parameter groups.
ximinf.nn_inference — Neural posterior/likelihood-ratio inference. Builds and runs BlackJAX NUTS samplers over grouped parameter blocks, combining trained neural network outputs with analytic log-priors.

Typical workflow

Simulate — Draw parameter sets with generate_sim.scan_params and generate mock SN Ia samples with generate_sim.simulate_one.
(Optional) Apply selection effects — Use selection_effects.apply_malmquist_bias to emulate realistic detection thresholds.
Train — Train per-group neural classifiers on simulated data with nn_train.train_loop.
Infer — Sample the posterior over cosmological parameters with nn_inference.sample_posterior / nn_inference.inference_loop, using a NUTS kernel built on the trained networks.
Validate — Check calibration of the resulting posteriors with nn_test.compute_ecp_tarp_groups.

License

This project is licensed under the GNU General Public License v3.0 (GPLv3). See LICENSE for details.

Author

Adam Trigui — a.trigui@ip2i.in2p3.fr IP2I Lyon

Release files for ximinf 0.0.167

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