Extended `nonzero_triples` with a boolean flag to conditionally skip sorting when input slots are already ordered. Updated call sites to pass appropriate flags, enabling a single-pass columnar traversal in the sparse matrix builder. Refactored `build_from_dense` into a batched processing pipeline that reduces repeated file access and improves sequential read performance. Added a diagnostic example to validate the new builder against existing dense matrices.
Eric Coissac
bb380d0c7d