NMSE example 3.10
pf,          0
pd,       7081
test,         time,            max,            avg
if,         723551,              0,           -nan
id,    2.28894e+06,             63,        44.8311
of,         594272,              0,           -nan
od,    1.43225e+06,        61.9986,        5.14274
df,              0,              0
dd,        1.58496,            195