NMSE example 3.10
pf,          0
pd,       7081
test,         time,            max,            avg
if,         721212,              0,           -nan
id,    2.29822e+06,             63,        44.8311
of,         598412,              0,           -nan
od,    1.43848e+06,        61.9986,        5.14274
df,              0,              0
dd,        1.58496,            195