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Tip Selection - memory efficient algorithm for computing comulative weights #558
Context: The whitepaper describes a need to perform cumulative weight calculations on the transactions in order to perform the MCMC algorithm.
Problem: There are two versions of the algorithm implemented in the code:
In use - a time and memory efficient algorithm that performs a different calculation than the one described in the WP. Each transaction sums the weight of its direct ancestors and adds itself. This way indirect ancestors may be counted more than once. This may cause weight to increase exponentially.
Solution: A space time efficient algorithm similar to algo (2). If you traverse the subtangle in topological order, you can dispose of sets you have used. See https://github.com/alongalky/iota-docs/blob/master/cumulative.md.