Skyborn now provides a fast PI backend aligned with tcpyPI, including log decomposition support

[QianyeSu]

Hi,

I wanted to share that I recently updated the GPI / PI module in my package, Skyborn, to stay closely aligned with tcpyPI.

Skyborn now exposes decomposition-related functionality corresponding to:

• log_decompose_pi
• pi_log_decomposition

These were added to match the newer tcpyPI workflow more closely.

Consistency with tcpyPI

I validated the Skyborn results directly against tcpyPI outputs using the sample/reference data from tcpyPI.

Current comparison shows that the agreement is very tight:

• core PI diagnostics remain highly consistent with tcpyPI
• RMSE for the main PI outputs is now on the order of 1e-4
• log-decomposition diagnostics also match very closely

Performance

Because Skyborn uses a compiled Fortran backend with whole-field processing, the same workflow is currently about 25x faster than point-by-point evaluation against tcpyPI in my benchmark setup.