Address TODO items for version 2.0.1#61
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Python improvements: - Extract shared within-transformation logic to utils.py - New demean_by_group() for one-way fixed effects demeaning - New within_transform() for two-way (unit + time) FE transformation - Reduces code duplication across estimators.py, twfe.py, sun_abraham.py, bacon.py - Fix DataFrame fragmentation warning by building columns in batch Rust backend optimizations: - Use Cholesky factorization for matrix inversion in linalg.rs - More efficient for symmetric positive-definite matrices (X'X) - Approximately half the operations of general LU decomposition - Reduce bootstrap allocations in bootstrap.rs - Allocate directly into pre-allocated buffer - Eliminates intermediate Vec<Vec<f64>> -> flatten -> Array2 pattern - Single allocation instead of two Version bump: 2.0.0 -> 2.0.1
The Rust backend optimizations (Cholesky factorization, reduced allocations) could not be tested in CI due to missing OpenBLAS library. Reverting these changes to keep v2.0.1 focused on tested Python improvements only. The Rust optimizations remain in TODO.md for future implementation when proper testing infrastructure is available.
igerber
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Jan 13, 2026
Review of the TODO items v2.0.1 PR covering: - Methodology: Verified numerical equivalence of new utility functions - Code quality: Well-documented, consistent API design - Performance: ~5x speedup from pandas groupby vs numpy loops - Maintainability: Eliminates 4 duplicate implementations Recommendation: APPROVE
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Python Code Quality: Within-Transformation Extraction