Deep Learning: Practical Neural Networks with Java

Preprocessing

Raw data collected from a data source usually presents different particularities, such as data range, sampling, and category. Some variables result from measurements while others are summarized or even calculated. Preprocessing means to adapt these variable values to a range that neural networks can handle properly.

Regarding weather variables, let's take a look at their range, sampling, and type:

Variable	Unit	Range	Sampling	Type
Mean temperature	º C	10.86 – 29.25	Hourly	Average of hourly measurements
Precipitation	mm	0 – 161.20	Daily	Accumulation of daily rain
Insolation	hours	0 – 10.40	Daily	Count of hours receiving sun radiation
Mean humidity	%	45.00 – 96.00	Hourly	Average of hourly measurements
Mean wind ...