model/ on SAFER Documentation

inferenceActivity.ts

Mon, 01 Jan 0001 00:00:00 +0000

Purpose

This module converts a rolling window of raw 3-axis accelerometer samples into a single physical activity intensity value expressed as Counts Per Minute (CPM).

Its responsibilities include:

Slicing the most recent 60-second window of samples from a stream
Computing a vector magnitude signal from XYZ axes
Applying a zero-phase bandpass filter (PAL4 coefficients, 0.6–6.2 Hz) to isolate locomotion frequencies
Segmenting the filtered signal into 30-sample epochs
Computing mean-removed area-under-the-curve (AUC) per epoch via trapezoidal integration
Scaling the summed AUC into a CPM value
Returning null on insufficient data, filter failures, or non-finite results

The resulting CPM value is suitable for downstream core temperature inference.

inferenceCoreTemp.ts

Mon, 01 Jan 0001 00:00:00 +0000

Purpose

This module predicts core body temperature (in Celsius) from physiological and environmental inputs using one of several ONNX model variants, with a physics-based fallback for environments where the ONNX runtime is unavailable.

inferenceWGBT.ts

Mon, 01 Jan 0001 00:00:00 +0000

Purpose

This module computes Wet Bulb Globe Temperature (WBGT) values from meteorological inputs using two XGBoost-derived ONNX models: one predicting Natural Wet Bulb temperature (NWB) and one predicting Globe Temperature (GT).

onnxAsset.ts

Mon, 01 Jan 0001 00:00:00 +0000

Purpose

This module handles the full lifecycle of ONNX model assets in an Expo React Native environment: locating bundled model files, copying them to the device cache directory on first use, and creating reusable InferenceSession instances.

onnxRuntime.ts

Mon, 01 Jan 0001 00:00:00 +0000

Purpose

This module provides safe, lazy access to the onnxruntime-react-native native module. Because the ONNX runtime requires a native build and is unavailable in Expo Go or stale builds, this module isolates the require() call, caches the result, and surfaces actionable error messages when the runtime cannot be loaded.

weatherTypes.ts

Mon, 01 Jan 0001 00:00:00 +0000

Purpose

This module defines the canonical type for a single normalized weather observation or forecast point used throughout the application.

It serves as the single source of truth for the weather data shape shared between: