CPU backend not found when trying to run solve_sci

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#9 opened on Aug 26, 2026 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 55/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Active
Tech stack: python
Domain: backend

Research direction

Start at the solve_sci entry point and reproduce the reported mismatch between SBD Device Information and the runtime error. Trace how available backends are discovered and passed to solve_sci; done means the CPU backend is recognized and the example runs without Backend 'cpu' not available.

Written by the indexing model from the issue text.

Description

Following the examples the SBD available backends is listed as

SBD Device Information
============================================================
✓ GPU Available: CUDA
  GPU Count: 1
✓ CPU Available: Always
============================================================

but when running solve_sci I get:

RuntimeError: Backend 'cpu' not available. Available: []

indicating that I do not have any available backends

Dominant language: Python
Stars: 2
Forks: 0
Avg merge: 8h 45m
Merged PRs (30d): 23

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