[J-Endres]

MRzeroCore now depends on bifti>=0.3.0, but the playground notebooks install MRzeroCore with --no-deps, so bifti never gets installed.

Changes

• 18 playground notebooks (documentation/playground_mr0/**): added !pip install bifti --no-deps right after !pip install MRzeroCore --no-deps. Where a notebook silences that install with &> /dev/null, the new line does too.
• .github/workflows/playground_test.yml: added pip install bifti (with dependencies) after the MRzeroCore install, since the CI environment starts empty and needs bifti's nibabel and requests.

Note

In the notebooks bifti is installed with --no-deps, like MRzeroCore. Colab already has nibabel and requests, and this keeps pip from upgrading Colab's numpy to the numpy>=2.5.1 that bifti asks for, which would force a runtime restart. If bifti really needs that numpy version, drop --no-deps from those lines.

---

Generated by Claude Code

[github-actions]

Simulation test: main (before) vs. this PR (after)

Sequence	Status	max mag NRMSE	max phase RMSE	max runtime Δ
mr0_DREAM_STE_seq	✅	0.00e+00	0.00e+00	+0.4%
mr0_DWI_SE_EPI	✅	0.00e+00	0.00e+00	+0.6%
mr0_EPI_2D_seq	✅	0.00e+00	0.00e+00	+3.0%
mr0_FID_seq	✅	0.00e+00	0.00e+00	+5.3%
mr0_FLASH_2D_seq	✅	0.00e+00	0.00e+00	+1.1%
mr0_GRE_to_FLASH	⚠️	–	–	–
mr0_RARE_2D_seq	✅	0.00e+00	0.00e+00	+10.7%
mr0_SE_CPMG_seq	✅	0.00e+00	0.00e+00	+6.8%
mr0_STE_3pulses_5echoes_seq	✅	0.00e+00	0.00e+00	+9.8%
mr0_TSE_2D_multi_shot_seq	✅	0.00e+00	0.00e+00	+4.7%
mr0_bSSFP_2D_seq	✅	0.00e+00	0.00e+00	+1.4%
mr0_diffusion_prep_STEAM_2D_seq	✅	0.00e+00	0.00e+00	+9.1%

✅ mr0_DREAM_STE_seq: All tests passed.

✅ mr0_DWI_SE_EPI: All tests passed.

✅ mr0_EPI_2D_seq: All tests passed.

✅ mr0_FID_seq: All tests passed.

✅ mr0_FLASH_2D_seq: All tests passed.

⚠️ mr0_GRE_to_FLASH: No comparison possible: [Errno 2] No such file or directory: '/home/runner/work/MRzero-Core/MRzero-Core/tests/simulation_test/ref_files/mr0_GRE_to_FLASH.seq.npz'

✅ mr0_RARE_2D_seq: All tests passed.

✅ mr0_SE_CPMG_seq: All tests passed.

✅ mr0_STE_3pulses_5echoes_seq: All tests passed.

✅ mr0_TSE_2D_multi_shot_seq: All tests passed.

✅ mr0_bSSFP_2D_seq: All tests passed.

✅ mr0_diffusion_prep_STEAM_2D_seq: All tests passed.

Workflow run — raw .npz data is attached as artifacts.