ValueError: numpy.ndarray size changed, may indicate binary incompatibility.

[ymd-h]

Recently, NumPy has changed its ABI at version 1.20.0 (Release Note, PR and Review)

Some variants of cpprb until v9.4.4 have been compiled with NumPy v1.20.0 without notice, and they produce runtime error with older NumPy; ValueError: numpy.ndarray size changed, may indicate binary incompatibility. Expected 88 from C header, got 80 from PyObject

From cpprb v9.4.5, we ensure compile with NumPy v1.19.5 or older.

When you encounter this problem, please update cpprb at least v9.4.5.
If you still cannot fix the problem after update, then you need to install from source by pip install --no-binary "cpprb>=9.4.5". For installation from source code, you need sufficient compiler. Please see the document for detail.

[ymd-h]

From cpprb v10.1.1, numpy<v1.20 are required at build phase. (setup_requires in setup.py)
This prevents unintentional binary incompatibility.