NMSE example 3.10
pf,          0
pd,       7081
test,         time,            max,            avg
if,         720282,              0,           -nan
id,     2.2948e+06,             63,        44.8311
of,         599101,              0,           -nan
od,     1.4392e+06,        61.9986,        5.14274
df,              0,              0
dd,        1.58496,            195