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Mining Smartphone Data (with Python)
@neal_lathia
PyData London 2016
Smartphones have sensors!
● Accelerometer (acceleration)
● Gyroscope (orientation)
● GPS, Wi-Fi (location)
● ...
● Microphone (sound)
● Bluetooth (co-location)
Smartphones have sensors!
● Accelerometer (acceleration)
● Gyroscope (orientation)
● GPS, Wi-Fi (location)
● ...
● Microphone (sound)
● Bluetooth (co-location)
This talk
● Collecting accelerometer data
● A peek at the raw data
● Magnitude data
● Applications
● Feature extraction
● Focus on classifcation
● https://github.com/nlathia/pydata_2016
Collecting Data
Collecting Data
Collecting Data
The raw data
Raw: Standing
Raw: Walk
Raw: Run
Raw: Stairs
Raw: On a Train
The magnitude vector
● We don't know how the phone is oriented
● We want to capture what is happening in the 3
axes in a single time series
Applications
● Step counting
– Brajdic, Harle. “Walk detection and step counting on
unconstrainted smartphones.” ACM Ubicomp '13.
● Unsupervised learning (profling)
– Lathia et al. “Happy People Live Active Lives.” Under
Submission.
● Activity classifcation
Unsupervised learning
Activity Classifcation
Activity classifcation: overview
● Get the time series data into some way to train
a classifer
● Train a classifer
● Predict activities
● ??
● Proft
Related Problem
Windowing
● Extract features from each window
Extract features from windows
● Statistical (mean, std dev)
● Time-series (jitter, kurtosis)
● Signal (frequency)
Reading: Hemminki, Nurmi, Tarkoma.
“Accelerometer-based Transportation Mode
Detection on Smartphones.” ACM Sensys '13.
Extract features from windows
Extract features from windows
Extract features from windows
Extract features from windows
Label Features
Data is ready.. classify
Data is ready.. classify
Further thoughts
● Collecting data effciently
– Background processes use loads of battery
● Real data is messier
– This was one person, one phone
● Feature engineering
– This was just an example.
● Other favours of classifcation
– Binary: “Is this walking?”
– Personalized vs. global models
Conclusion
● Collecting accelerometer data
● A peek at the raw data
● Magnitude data
● Applications
● Feature extraction
● Focus on classifcation
Mining Smartphone Data (with Python)
@neal_lathia
PyData London 2016
https://github.com/nlathia/pydata_2016

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Mining Smartphone Data (with Python)