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SUMMARY:Café Fortran - FGPT: Automatic Transpilation of Fortran to Python
 \, JAX\, and Automatic Differentiation
DTSTART:20261105T090000Z
DTEND:20261105T100000Z
DTSTAMP:20261008T040400Z
UID:indico-event-926@indico.mathrice.fr
CONTACT:fabrice.roy@obspm.fr
DESCRIPTION:Speakers: Kazem Ardaneh (IPSL)\, Shivamshan Sivanesan (IPSL)\n
 \nFGPT is a general-purpose source-to-source transpiler that modernizes le
 gacy Fortran. Its dependency-aware isolation frontend\, built on the fpars
 er parser\, uses breadth-first search to traverse module dependencies — 
 resolving declarations\, subroutine definitions\, interfaces\, and externa
 l procedures — and extracts each target procedure into a standalone unit
 . An AST-based middle-end then lowers Fortran into Python/NumPy\, differen
 tiable Fortran via Tapenade\, or GPU-adapted Fortran\, while a JAX backend
  produces Equinox modules for GPU acceleration and automatic differentiati
 on. Unlike LLM-based approaches\, FGPT preserves program semantics and val
 idates every output numerically against the original Fortran. Evaluated on
  some modules (~15\,000 lines) of the IPSL land-surface model (~300\,000 l
 ines)\, it delivers correct\, differentiable implementations with deviatio
 ns of 10⁻⁹–10⁻¹⁶ and up to 3.66× speedup in JAX over compiled 
 Fortran — no manual rewriting required.\n\nhttps://indico.mathrice.fr/ev
 ent/926/
URL:https://indico.mathrice.fr/event/926/
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