message: Avoid CPU pinning in treelite
diff: #include <iostream>
  #include <stdio.h>
  #include <stdlib.h>
  +#include <TSystem.h>
  namespace {
  inline bool checkFile (const std::string name) {
  @@ -39,6 +40,7 @@ AliExternalBDT::AliExternalBDT(std::string name) :
  fOutSize{0u},
  fNumFeatures{0u}
  {
  + gSystem->Setenv("TREELITE_BIND_THREADS","0");
  }
  