v2023.4.0

Feature

• Add API to download crypto sample data (6041ada)
• Support writing and reading from directory (2553366)
• Allow setting validity in fitting and transforming rolling risk model (32a1f6a)
• Support asymptotic principal components (APCA) (7169189)

Fix

• Align parameter n_components type in apca with scikit-learn (3394dbf)

Documentation

• Update example notebook (b102c02)
• Add apca section (7f41707)
• Change the weights to market cap sqrt (20574e4)