Public bug reported:

pymatgen 2025.10.7+dfsg1-1 FTBFS on armhf with numerous memory errors

>           dct = orjson.loads(file.read())
                  ^^^^^^^^^^^^^^^^^^^^^^^^^
E           orjson.JSONDecodeError: Not enough memory to allocate buffer for 
parsing: line 1 column 1 (char 0)

/<<PKGBUILDDIR>>/.pybuild/test_python3.13/tests/phonon/test_plotter.py:66:
JSONDecodeError

.

>       cdiff = np.subtract.outer(egrid, egrid) + csfhit
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
E       numpy._core._exceptions._ArrayMemoryError: Unable to allocate 137. MiB 
for an array with shape (3000, 3000) and data type complex128

/<<PKGBUILDDIR>>/.pybuild/test_python3.13/pymatgen/io/vasp/optics.py:467:
MemoryError

.

>           dist = inv_ms[:, :, None, :] - min_vecs[None, None, :, :]
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
E           numpy._core._exceptions._ArrayMemoryError: Unable to allocate 24.1 
MiB for an array with shape (3136, 3, 112, 3) and data type float64

/<<PKGBUILDDIR>>/.pybuild/test_python3.13/pymatgen/core/structure.py:2670:
MemoryError

** Affects: pymatgen (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: ftbfs

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https://bugs.launchpad.net/bugs/2140313

Title:
  pymatgen: FTBFS on armhf - memory errors

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