Extended example to use logistic regression code

examples/android/android-simple/app/src/main/cpp/KomputeModelML.hpp

@@ -0,0 +1,85 @@
+
+#ifndef KOMPUTEMODELML_HPP
+#define KOMPUTEMODELML_HPP
+
+#include <vector>
+#include <string>
+
+#include "kompute/Kompute.hpp"
+
+class KomputeModelML {
+
+public:
+    KomputeModelML();
+    virtual ~KomputeModelML();
+
+    void train(std::vector<float> yData, std::vector<float> xIData, std::vector<float> xJData);
+
+    std::vector<float> predict(std::vector<float> xI, std::vector<float> xJ);
+
+    std::vector<float> get_params();
+
+private:
+    kp::Tensor mWeights;
+    kp::Tensor mBias;
+
+};
+
+static std::string LR_SHADER = R"(
+#version 450
+
+layout (constant_id = 0) const uint M = 0;
+
+layout (local_size_x = 1) in;
+
+layout(set = 0, binding = 0) buffer bxi { float xi[]; };
+layout(set = 0, binding = 1) buffer bxj { float xj[]; };
+layout(set = 0, binding = 2) buffer by { float y[]; };
+layout(set = 0, binding = 3) buffer bwin { float win[]; };
+layout(set = 0, binding = 4) buffer bwouti { float wouti[]; };
+layout(set = 0, binding = 5) buffer bwoutj { float woutj[]; };
+layout(set = 0, binding = 6) buffer bbin { float bin[]; };
+layout(set = 0, binding = 7) buffer bbout { float bout[]; };
+layout(set = 0, binding = 8) buffer blout { float lout[]; };
+
+float m = float(M);
+
+float sigmoid(float z) {
+    return 1.0 / (1.0 + exp(-z));
+}
+
+float inference(vec2 x, vec2 w, float b) {
+    // Compute the linear mapping function
+    float z = dot(w, x) + b;
+    // Calculate the y-hat with sigmoid
+    float yHat = sigmoid(z);
+    return yHat;
+}
+
+float calculateLoss(float yHat, float y) {
+    return -(y * log(yHat)  +  (1.0 - y) * log(1.0 - yHat));
+}
+
+void main() {
+    uint idx = gl_GlobalInvocationID.x;
+
+    vec2 wCurr = vec2(win[0], win[1]);
+    float bCurr = bin[0];
+
+    vec2 xCurr = vec2(xi[idx], xj[idx]);
+    float yCurr = y[idx];
+
+    float yHat = inference(xCurr, wCurr, bCurr);
+
+    float dZ = yHat - yCurr;
+    vec2 dW = (1. / m) * xCurr * dZ;
+    float dB = (1. / m) * dZ;
+    wouti[idx] = dW.x;
+    woutj[idx] = dW.y;
+    bout[idx] = dB;
+
+    lout[idx] = calculateLoss(yHat, yCurr);
+}
+)";
+
+#endif //ANDROID_SIMPLE_KOMPUTEMODELML_HPP