Module library 

Fast spectral-library writer: decode Prosit intensity vectors into a DiaNN/ Spectronaut-style transition .tsv in parallel.

The per-peptide decode (PeptideSequence::associate_with_predicted_intensities) is already a Rust kernel in mscore; the slow part of a Python library builder is calling it millions of times across the PyO3 boundary and assembling a giant DataFrame. This does the whole batch in Rust with rayon and streams the rows straight to disk — turning a multi-hour build into seconds.

The caller (Python) supplies the cheap string columns it already has (ModifiedPeptide in DiaNN (UniMod:n) form, the stripped PeptideSequence) so this module needs no mod-notation regex; ordinals come from the fragment ion’s own amino_acid_count().

Constants

LIBRARY_HEADER

DiaNN/Spectronaut transition columns, in output order.

Functions

build_spectral_library_tsv

Decode one batch of peptides (parallel) and write/append their transitions to out_path as a DiaNN-style .tsv.