doit toutner sur machine plutôt standard, utilisateur "lambda"
utiliser Rcpp ?
+=====
+
+trategies for upscaling
+From 25K to 25M : in 1000 chunks of 25K
+Reference values :
+ K 0 = 200 super consumers (SC)
+ K ∗ = 15 nal clusters
+1st strategy
+ Do 1000 times ONLY Energycon's 1st-step strategy on 25K clients
+ With the 1000 × K 0 SC perform a 2-step run leading to K ∗ clusters
+
+--> il faut s'arranger pour que
+
+2nd strategy
+ Do 1000 times Energycon's 2-step strategy on 25K clients leading to
+ 1000 × K ∗ intermediate clusters
+ Treat the intermediate clusters as individual curves and perform a
+ single 2-step run to get K ∗ nal clusters