v0.4.0

ChenSignatures v0.4.0

Diff since v0.3.1

This release introduces standard path preprocessing techniques essential for robust signature applications in machine learning.
It is considered breaking as it is a new version.

New Features

• Time Augmentation: Added time_augment(path) to append a monotone time coordinate (ensures uniqueness of the signature).
• Lead–Lag Transform: Added lead_lag(path) to convert linear paths into axis-parallel paths (captures quadratic variation and removes tree-like equivalence issues).
• Convenience Wrappers: New shorthand functions to augment and compute in one step:
  • sig_time / logsig_time
  • sig_leadlag / logsig_leadlag

Python Wrapper (chen)

• Exposed all new augmentation functions (time_augment, lead_lag) and their signature wrappers to the Python API.

Merged pull requests:

• Add path augmentation helpers and bump to 0.4.0 (#44) (@aleCombi)