Optimisation in graph traversal for ISA-TAB serialisation #403
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Zigur
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This PR refactors the way the process sequence graph is built for both Study and Assay Table. The graph now only uses identifiers instead of the full objects.
This optimisation tremendously improves the serialisation performance of
isatab.dump()and associated functions (three to four orders of magnitude for datasets with thousands/tens of thousands of samples)