Feature set (Intermediate feature files)

Inside the data/featureset or data/pkl folder, you won’t find any files in this folder until you run the codes. Files in data/featureset folder are in .csv format and files in data/pkl folder are in binary format .pkl. Both will share the same filename and have the same content/values once loaded in the program.

[session name]_[feature set type].[window size].[data type].csv
[session name]_[feature set type].[window size].[data type].pkl

There will be two data types: one is for feature vector (.data.csv or .data.pkl) and the other is for class label (.class.csv or .class.pkl). They are associated with each other.

For example, session1_BFW.40.data.csv represents feature vectors for session 1 and the features are computed with data from both wrists and with window size of 40 samples (which is 1s under 40 Hz sampling rate).

As another example, session_all_DW.600.class.csv represents class labels for all sessions and the corresponding .data.csv is computed with dominant wrist accelerometer data with window size 600 samples (which is 15s under 40 Hz sampling rate).

Feature vector file format

There will be a header row. The first column is the index of current segment (start from 0). And the rest columns are different features. It’s easy to understand the meaning through the names, or you may refer to the documentation of the source codes.

Class label file format

There will be a header row with all necessary or unnecessary columns, you can choose to use any of them.

Column name	Meaning
segment	index of current segment (start from 0)
STARTTIME	start time of current segment
ENDTIME	end time of current segment
seg duration	the duration of current segment in seconds
session	the number indicate which session current segment belongs to
sensor	which sensor does current segment row belongs to (DW, NDW, and BFW), refer to footnote 5 for explanation.
inside puff/puff duration	The duration of puffing happens within current segment / the duration of this current puffing
inside puff/segment duration	The duration of puffing happens within current segment / the duration of this current segment
prototypical?	Whether it’s prototypical puff or not (0, 1) if no-puff, leave empty string
puff index	the index of puff for current segment from current sensor
puff side	left or right
car percentage	The percentage of time that in-car activity occupies current segment
talk percentage	The percentage of time that talking activity occupies current segment
unknown percentage	The percentage of time that unknown-activity occupies current segment
drinking percentage	The percentage of time that drinking-beverage activity occupies current segment
reading percentage	The percentage of time that reading-paper activity occupies current segment
eating percentage	The percentage of time that eating-a-meal activity occupies current segment
smoking percentage	The percentage of time that smoking activity occupies current segment
computer percentage	The percentage of time that using-computer activity occupies current segment
phone percentage	The percentage of time that using-phone activity occupies current segment
walking percentage	The percentage of time that walking posture occupies current segment
superposition percentage	The percentage of time that activity superposition happens during current segment[6]</sup>
name	The name of the class assigned to this segment
target	The index of the class assigned to this segment