StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics https://doi.org/10.1109/TVCG.2020.3030352
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StackGenVis/frontend/node_modules/mapbox-gl/src/shaders/heatmap.fragment.glsl

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uniform highp float u_intensity;
varying vec2 v_extrude;
#pragma mapbox: define highp float weight
// Gaussian kernel coefficient: 1 / sqrt(2 * PI)
#define GAUSS_COEF 0.3989422804014327
void main() {
#pragma mapbox: initialize highp float weight
// Kernel density estimation with a Gaussian kernel of size 5x5
float d = -0.5 * 3.0 * 3.0 * dot(v_extrude, v_extrude);
float val = weight * u_intensity * GAUSS_COEF * exp(d);
gl_FragColor = vec4(val, 1.0, 1.0, 1.0);
#ifdef OVERDRAW_INSPECTOR
gl_FragColor = vec4(1.0);
#endif
}