| # About Local Density Penalty Described in the Original RePlace Paper | |
| Tool: Global Placement | |
| Subcategory: Code implementation query | |
| ## Conversation | |
| ### by1e11 | |
| Hi, guys | |
| After reading the paper and browsing the source codes, I cannot figure out which parts of the codes reflect the local density penalty described in the paper, could you please suggest where can I find that in the implementation? | |
| Thanks a lot for the nice work. | |
| Bo | |
| ### maliberty | |
| @mgwoo can you answer this? | |
| ### mangohehe | |
| A method related density computation seems to be removed in the CL https://github.com/The-OpenROAD-Project/OpenROAD/commit/0f82f83049733938c2fb5d6141b291409aa4678f , in which the original design calls updateDensityForceBin inside NesterovPlace::doNesterovPlace. (not sure if this can be related) | |
| @ahmadelrouby could you help understand the changes? thanks | |
| ### mgwoo | |
| I didn't decipher the local density features because of unstable issues. | |
| Please check the standalone repo for the local density calculation: https://github.com/The-OpenROAD-Project/RePlAce/blob/7c07cffdf419c4dbd315c73c235ec5d670fb0240/src/ns.cpp#L1011 | |