perf: batched transform_mapping_matrix in TransformerNUFFT (single nufft2d2 call)#305
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…fft2d2 call) The previous implementation looped over each source-pixel column in Python, scattering each into a (N_y, N_x) image and calling _forward_native separately. Under jax.jit this fully unrolled into n_src distinct nufft2d2 invocations in one trace, ballooning the JIT graph for pixelization-heavy fits — most visibly the rectangular_dspl JAX-likelihood script, where two source planes with mesh_shape=(30,30) gave 1800 inlined NUFFTs and caused 11+ minute slow-compile warnings (and OOM on 16 GB hosts). The replacement scatters all columns into a single (n_src, N_y, N_x) batched array and calls nufft2d2 once with batched f. nufftax natively supports the batched form. Numerical results unchanged (existing test_transformer.py passes); the JIT graph drops from O(n_src) NUFFTs to a single batched NUFFT call. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
TransformerNUFFT.transform_mapping_matrixpreviously looped over each source-pixel column in Python, scattering each into a(N_y, N_x)native image and calling_forward_nativeseparately. Underjax.jitthis fully unrolled inton_srcdistinctnufft2d2invocations in a single trace, ballooning the JIT graph for pixelization-heavy fits.This was most visible on
autolens_workspace_test/scripts/jax_likelihood_functions/interferometer/rectangular_dspl.py: two source planes withmesh_shape=(30, 30)gave 1800 inlined NUFFTs in the JIT trace and caused 11+ minute slow-compile warnings + OOM on the 16 GB CI box.The replacement scatters all columns into a single
(n_src, N_y, N_x)batched array and callsnufft2d2once with batchedf.nufftaxnatively supports the batched form. The JIT graph drops from O(n_src) NUFFTs to a single batched NUFFT call.API Changes
None. The method signature, return shape (
(M, n_src)), and numerical result are unchanged.Test plan
pytest test_autoarray/operators/test_transformer.py— 8/8 passpytest test_autoarray/— 750/750 passblack --checkcleaninterferometer/rectangular_dspl.py(with mesh reduced to 8x8) compiles in seconds and produces the same canonical likelihood as the old loop implementationCompanion PR
autolens_workspace_testwill follow with the JAX-likelihood cross-check that exercises this fast path end-to-end.🤖 Generated with Claude Code