docs: public static void normalizeL2( TupleDesc_F64 desc ) {
  		double norm = 0;
  		for (int i = 0; i < desc.size(); i++) {
  			double v = desc.value[i];
  			norm += v*v;
  		}
  		if( norm == 0 )
  			return;
  
  		norm = Math.sqrt(norm);
  		for (int i = 0; i < desc.size(); i++) {
  			desc.value[i] /= norm;
  		}
  	}