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(changelog)=
# Change Log
## Jan-29-2026: Version 1.6.1
- Refactored `matrix.py` and `eig_tools*.py`.
A- dded dependency constraint to exclude scipy 1.7.0.
## Nov-30-2025: Version 1.6.0
- Sparse solver for FC2.
- Deprecated `displacements` and `forces` parameters for instantiating the
`Symfc` class. Use its attributes after instantiation.
## Jul-21-2025: Version 1.5.4
- Improve eigensolver for large projector.
- Check symmetric property of projector and make it symmetric unless the
symmetry is largely broken.
## Jul-15-2025: Version 1.5.3
- More optimization for basis set computations.
## Jul-14-2025: Version 1.5.2
- Improve memory efficiency and calculation performance for basis set
computations using block matrix tree.
## Jul-10-2025: Version 1.5.1
- Improve memory efficiency and calculation performance for basis set
computations. The current implementation shows particular effectiveness with
`use_mkl=True` (requires sparse-dot-mkl) for large systems.
## Jul-3-2025: Version 1.5.0
- Improve memory efficiency in computing basis sets
## Jun-26-2025: Version 1.4.1
- Small fix for specific case
## May-31-2025: Version 1.4.0
- Maintenance release after refactoring
## Feb-25-2025: Version 1.3.4
- Maintenance release after refactoring
## Feb-11-2025: Version 1.3.3
- Fix minor translational invariance issues in O2, O3, and O4
## Feb-10-2025: Version 1.3.2
- Use numerically stable version of O3 translational invariance
## Feb-5-2025: Version 1.3.1
- Enabled cutoff parameter for fc2.
## Feb-4-2025: Version 1.3.0
- Add `Symfc.estimate_basis_set()`.
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