8000 BUG: circular import error with `linalg._matfuncs_sqrtm_triu` on 1.16.0rc1 · Issue #23037 · scipy/scipy · GitHub
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BUG: circular import error with linalg._matfuncs_sqrtm_triu on 1.16.0rc1 #23037

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jorenham opened this issue May 22, 2025 · 3 comments
Open

BUG: circular import error with linalg._matfuncs_sqrtm_triu on 1.16.0rc1 #23037

jorenham opened this issue May 22, 2025 · 3 comments
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defect A clear bug or issue that prevents SciPy from being installed or used as expected scipy.linalg
Milestone
1.17.0

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@jorenham
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Describe your issue.

from scipy.linalg import _matfuncs_sqrtm_triu raises an ImportError

Reproducing Code Example

>>> from scipy.linalg import _matfuncs_sqrtm_triu
Traceback (most recent call last):
  File "<python-input-0>", line 1, in <module>
    from scipy.linalg import _matfuncs_sqrtm_triu
  File "scipy/linalg/_matfuncs_sqrtm_triu.pyx", line 2, in init scipy.linalg._matfuncs_sqrtm_triu
  File "/home/joren/.pyenv/versions/3.13.3/lib/python3.13/site-packages/scipy/linalg/_matfuncs_sqrtm.py", line 17, in <module>
    from ._matfuncs_sqrtm_triu import within_block_loop  # noqa: E402
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ImportError: cannot import name 'within_block_loop' from partially initialized module 'scipy.linalg._matfuncs_sqrtm_triu' (most likely due to a circular import) (/home/joren/.pyenv/versions/3.13.3/lib/python3.13/site-packages/scipy/linalg/_matfuncs_sqrtm_triu.cpython-313-x86_64-linux-gnu.so)

Error message

Traceback (most recent call last):
  File "<python-input-0>", line 1, in <module>
    from scipy.linalg import _matfuncs_sqrtm_triu
  File "scipy/linalg/_matfuncs_sqrtm_triu.pyx", line 2, in init scipy.linalg._matfuncs_sqrtm_triu
  File "/home/joren/.pyenv/versions/3.13.3/lib/python3.13/site-packages/scipy/linalg/_matfuncs_sqrtm.py", line 17, in <module>
    from ._matfuncs_sqrtm_triu import within_block_loop  # noqa: E402
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ImportError: cannot import name 'within_block_loop' from partially initialized module 'scipy.linalg._matfuncs_sqrtm_triu' (most likely due to a circular import) (/home/joren/.pyenv/versions/3.13.3/lib/python3.13/site-packages/scipy/linalg/_matfuncs_sqrtm_triu.cpython-313-x86_64-linux-gnu.so)

SciPy/NumPy/Python version and system information

>>> import sys, scipy, numpy; print(scipy.__version__, numpy.__version__, sys.version_info); scipy.show_config()
1.16.0rc1 2.2.6 sys.version_info(major=3, minor=13, micro=3, releaselevel='final', serial=0)
/home/joren/.pyenv/versions/3.13.3/lib/python3.13/site-packages/scipy/__config__.py:154: UserWarning: Install `pyyaml` for better output
  warnings.warn("Install `pyyaml` for better output", stacklevel=1)
{
  "Compilers": {
    "c": {
      "name": "gcc",
      "linker": "ld.bfd",
      "version": "10.2.1",
      "commands": "cc"
    },
    "cython": {
      "name": "cython",
      "linker": "cython",
      "version": "3.1.1",
      "commands": "cython"
    },
    "c++": {
      "name": "gcc",
      "linker": "ld.bfd",
      "version": "10.2.1",
      "commands": "c++"
    },
    "fortran": {
      "name": "gcc",
      "linker": "ld.bfd",
      "version": "10.2.1",
      "commands": "gfortran"
    },
    "pythran": {
      "version": "0.17.0",
      "include directory": "../../tmp/pip-build-env-81uwjfeo/overlay/lib/python3.13/site-packages/pythran"
    }
  },
  "Machine Information": {
    "host": {
      "cpu": "x86_64",
      "family": "x86_64",
      "endian": "little",
      "system": "linux"
    },
    "build": {
      "cpu": "x86_64",
      "family": "x86_64",
      "endian": "little",
      "system": "linux"
    },
    "cross-compiled": false
  },
  "Build Dependencies": {
    "blas": {
      "name": "scipy-openblas",
      "found": true,
      "version": "0.3.28",
      "detection method": "pkgconfig",
      "include directory": "/opt/_internal/cpython-3.13.2/lib/python3.13/site-packages/scipy_openblas32/include",
      "lib directory": "/opt/_internal/cpython-3.13.2/lib/python3.13/site-packages/scipy_openblas32/lib",
      "openblas configuration": "OpenBLAS 0.3.28 DYNAMIC_ARCH NO_AFFINITY Haswell MAX_THREADS=64",
      "pc file directory": "/project"
    },
    "lapack": {
      "name": "scipy-openblas",
      "found": true,
      "version": "0.3.28",
      "detection method": "pkgconfig",
      "include directory": "/opt/_internal/cpython-3.13.2/lib/python3.13/site-packages/scipy_openblas32/include",
      "lib directory": "/opt/_internal/cpython-3.13.2/lib/python3.13/site-packages/scipy_openblas32/lib",
      "openblas configuration": "OpenBLAS 0.3.28 DYNAMIC_ARCH NO_AFFINITY Haswell MAX_THREADS=64",
      "pc file directory": "/project"
    },
    "pybind11": {
      "name": "pybind11",
      "version": "2.13.6",
      "detection method": "config-tool",
      "include directory": "unknown"
    }
  },
  "Python Information": {
    "path": "/opt/python/cp313-cp313/bin/python",
    "version": "3.13"
  }
}
@jorenham jorenham added the defect A clear bug or issue that prevents SciPy from being installed or used as expected label May 22, 2025
@j-bowhay j-bowhay added this to the 1.16.0 milestone May 22, 2025
@ilayn
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ilayn commented May 22, 2025

This is known and will go away once we rewrite logm. Here is a similar comment inside logm

scipy/scipy/linalg/_matfuncs.py

Lines 216 to 217 in 6519720

# Avoid circular import ... this is OK, right?
import scipy.linalg._matfuncs_inv_ssq

The reason why sqrtm rewrite still left this piece in is because internally logm is still using this piece written in Cython/Pythran.

@jorenham
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jorenham commented May 22, 2025 •
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This is known and will go away once we rewrite logm

will that rewrite be included in 1.16.0?

@ilayn
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ilayn commented May 22, 2025

No 1.17 earliest I think

@lucascolley lucascolley modified the milestones: 1.16.0, 1.17.0 May 23, 2025
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defect A clear bug or issue that prevents SciPy from being installed or used as expected scipy.linalg
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