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Fixes for backpropogation

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Степанов Платон
2025-11-04 17:01:56 +04:00
parent 381b686997
commit 00edcfbd7e
4 changed files with 128 additions and 58 deletions
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src/main
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154
src/main.cpp
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@@ -38,7 +38,7 @@ public:
: Layer(layer), inputFeatures(inputFeatures),
weights(layer.getOuputFeatures(), inputFeatures) {}
ConnectedLayer(const Layer &a, const Layer &b)
: ConnectedLayer(b.getOuputFeatures(), a) {}
: ConnectedLayer(a.getOuputFeatures(), b) {}
int getInputFeatures() const { return inputFeatures; }
const Matrix &getWeights() const { return weights; }
@@ -47,7 +47,6 @@ public:
class LearnLayer : public ConnectedLayer {
protected:
// Matrix gradients;
Matrix internal;
Matrix outputs;
@@ -57,7 +56,7 @@ public:
internal(layer.getOuputFeatures(), inputFeatures, false),
outputs(layer.getOuputFeatures(), inputFeatures, false) {}
LearnLayer(const Layer &a, const Layer &b)
: LearnLayer(b.getOuputFeatures(), a) {}
: LearnLayer(a.getOuputFeatures(), b) {}
const Matrix &getInternal() const { return internal; }
const Matrix &getOutputs() const { return outputs; }
@@ -101,16 +100,16 @@ public:
// employ back
layers.push_back(LearnLayer(inputFeatures, l[0]));
for (size_t i = 1; i < l.size(); i++)
layers.push_back(LearnLayer(l[i - 1].getOuputFeatures(), l[i]));
layers.push_back(LearnLayer(l[i - 1], l[i]));
}
Matrix learn(Matrix inputs, Matrix target, float speed = 1.0f) {
MatrixMath mm;
VectorMath vm;
for (size_t i = 0; i < layers.size(); i++) {
layers[i].setInternal(mm.dot(i == 0 ? inputs : layers[i - 1].getOutputs(),
layers[i].getWeights(), false, true,
&layers[i].getBias()));
layers[i].setInternal(mm.dot(layers[i].getWeights(),
i == 0 ? inputs : layers[i - 1].getOutputs(),
false, false, &layers[i].getBias()));
layers[i].setOutputs(mm.activate(layers[i].getInternal(),
layers[i].getActivation(),
layers[i].getAlpha()));
@@ -120,17 +119,26 @@ public:
std::vector<float> io = inputs.toVector();
std::cout << "I: ";
for (size_t i = 0; i < io.size(); ++i)
printf("%5.3f ", io[i]);
printf("%4.2f ", io[i]);
std::vector<float> ni = layers[layers.size() - 1].getInternal().toVector();
std::cout << "| NNI: ";
for (size_t i = 0; i < ni.size(); ++i)
printf("%4.2f ", ni[i]);
std::vector<float> no = layers[layers.size() - 1].getOutputs().toVector();
std::cout << "| NN: ";
std::cout << "| NNO: ";
for (size_t i = 0; i < no.size(); ++i)
printf("%5.3f ", no[i]);
printf("%4.2f ", no[i]);
std::vector<float> to = target.toVector();
std::cout << "| T: ";
for (size_t i = 0; i < to.size(); ++i)
printf("%5.3f ", to[i]);
printf("%4.2f ", to[i]);
Matrix mse =
mm.loss(layers[layers.size() - 1].getOutputs(), target, Loss::MSE);
std::vector<float> lo = mse.toVector();
std::cout << "| L: ";
for (size_t i = 0; i < lo.size(); ++i)
@@ -139,25 +147,48 @@ public:
Matrix dAnl =
mm.d_loss(layers[layers.size() - 1].getOutputs(), target, Loss::MSE);
for (int i = layers.size() - 1; i >= 0; --i) {
printf("=== Layer %d ===\n", i + 1);
printf("dAnl: ");
dAnl.print();
Matrix dZl = mm.mult(dAnl, mm.d_activate(layers[i].getInternal()));
Matrix dWl = mm.mult(
mm.dot(dZl, i == 0 ? inputs : layers[i - 1].getOutputs(), true),
printf("dZl: ");
dZl.print();
Matrix dWl =
mm.mult(mm.dot(dZl, i == 0 ? inputs : layers[i - 1].getOutputs(),
false, true),
1.0f / (float)inputs.getRows());
printf("dWl: ");
dWl.print();
Vector dbl = mm.axis_sum(mm.mult(dZl, 1.0f / (float)inputs.getRows()));
dAnl = mm.dot(dZl, layers[i].getWeights(), false, false); // false true?!
printf("dbl: ");
dbl.print();
dAnl = mm.dot(layers[i].getWeights(), dZl, true); // false true?!
mm.await();
layers[i].setWeights(mm.add(layers[i].getWeights(), dWl, -speed));
printf("Weights %d: ", i + 1);
layers[i].getWeights().print();
layers[i].setBias(
vm.add(layers[i].getBias(), dbl, -speed / (float)inputs.getRows()));
printf("Bias %d: ", i + 1);
layers[i].getBias().print();
}
return mse;
}
const LearnLayer &getLayer(int i) const { return layers[i]; }
// delete
LearnLayer &getLayer(int i) { return layers[i]; }
};
#ifndef NOGPU
@@ -165,41 +196,80 @@ OpenCL openCL;
#endif
int main() {
// LearnNerualNetrowk nn(
// 3, {Layer(3, Activation::SIGMOID), Layer(3, Activation::SIGMOID)});
//
// Matrix weights1(3, 3,
// {0.88f, 0.39f, 0.9f, 0.37f, 0.14f, 0.41f, 0.96f, 0.5f,
// 0.6f});
// Matrix weights2(
// 3, 3, {0.29f, 0.57f, 0.36f, 0.73f, 0.53f, 0.68f, 0.01f, 0.02f, 0.58f});
//
// Vector bias1(std::vector<float>{0.23f, 0.89f, 0.08f});
// Vector bias2(std::vector<float>{0.78f, 0.83f, 0.8f});
//
// nn.getLayer(0).setWeights(weights1);
// nn.getLayer(0).setBias(bias1);
//
// nn.getLayer(1).setWeights(weights2);
// nn.getLayer(1).setBias(bias2);
//
// std::cout << std::endl;
//
// Matrix input(3, 1, {0.03f, 0.72f, 0.49f});
// Matrix target(3, 1, {0.93f, 0.74f, 0.17f});
//
// // for (int i = 0; i < 1000; i++)
// nn.learn(input, target, 0.01f);
LearnNerualNetrowk nn(
2, {Layer(2, Activation::TANH), Layer(1, Activation::SIGMOID)});
std::cout << std::endl;
2, {Layer(3, Activation::SIGMOID), Layer(1, Activation::SIGMOID)});
// Matrix input(4, 2);
// Matrix target(4, 1);
//
// for (int batch = 0; batch < 4; batch++) {
// for (int i = 0; i < 4; i++) {
// int v1 = (i / 2) % 2;
// int v2 = i % 2;
//
// input(i, 0) = static_cast<float>(v1);
// input(i, 1) = static_cast<float>(v2);
// target(i, 0) = static_cast<float>(v1 ^ v2);
// }
// }
//
// for (int i = 0; i < 10; i++) {
// printf("%4d | ", i + 1);
// Matrix mse = nn.learn(input, target, 0.1f * std::pow(0.99, i));
// }
Matrix input(2, 4);
Matrix target(1, 4);
for (int i = 0; i < 4 * 1000; i++) {
float min = 100.0f;
for (int batch = 0; batch < 4; batch++) {
for (int i = 0; i < 4; i++) {
int v1 = (i / 2) % 2;
int v2 = i % 2;
Matrix input(1, 2, {static_cast<float>(v1), static_cast<float>(v2)});
Matrix target(1, 1, static_cast<float>(v1 ^ v2));
printf("%5d | ", i + 1);
Matrix mse = nn.learn(input, target, 0.00003f);
if (i % 4 == 3)
std::cout << std::endl;
input(0, i) = static_cast<float>(v1);
input(1, i) = static_cast<float>(v2);
target(0, i) = static_cast<float>(v1 ^ v2);
}
}
for (int i = 0; i < 1000; i++) {
printf("%4d | ", i + 1);
Matrix mse = nn.learn(input, target, 0.0001f * std::pow(0.99f, i));
std::vector<float> lv = mse.toVector();
float loss = 0.0f;
for (size_t i = 0; i < lv.size(); ++i)
loss += lv[i];
if (loss < min)
min = loss;
}
std::cout << min << std::endl;
// LearnNerualNetrowk nn(
// 2, {Layer(3, Activation::SIGMOID), Layer(1, Activation::SIGMOID)});
// float min = 100.0f;
// for (int i = 0; i < 4 * 10000; i++) {
// int v1 = (i / 2) % 2;
// int v2 = i % 2;
//
// Matrix input(2, 1, {static_cast<float>(v1), static_cast<float>(v2)});
// Matrix target(1, 1, static_cast<float>(v1 ^ v2));
//
// printf("%5d | ", i + 1);
// Matrix mse = nn.learn(input, target, 0.0001f * std::pow(0.95f, i));
// if (i % 4 == 3)
// std::cout << std::endl;
// if (mse[0] < min)
// min = mse[0];
// }
// std::cout << min << std::endl;
return 0;
}

20
src/math/tensor/cpu/math.hpp
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@@ -116,13 +116,13 @@ private:
Tensor2 mse(const Tensor2 &a, const Tensor2 &b) {
Tensor2 result(a.getShape(), false);
for (size_t i = 0; i < result.getSize(); ++i)
result[i] += (a[i] - b[i]) * (a[i] - b[i]) / (float)a.getCols();
result[i] = (a[i] - b[i]) * (a[i] - b[i]) / (float)a.getCols();
return result;
}
Tensor2 dmse(const Tensor2 &a, const Tensor2 &b) {
Tensor2 d_mse(const Tensor2 &a, const Tensor2 &b) {
Tensor2 result(a.getShape(), false);
for (size_t i = 0; i < result.getSize(); ++i)
result[i] += 2 * (a[i] - b[i]) / (float)a.getCols();
result[i] = 2 * (a[i] - b[i]) / (float)a.getCols();
return result;
}
@@ -133,7 +133,7 @@ public:
float alpha = 0.01f) override {
validateMultDimensions(a, b, transpose_a, transpose_b);
if (bias != nullptr)
validateBiasDimensions(b, *bias, transpose_b);
validateBiasDimensions(a, *bias, transpose_a);
Tensor2 result(transpose_a ? a.getCols() : a.getRows(),
transpose_b ? b.getRows() : b.getCols(), 0.0f);
for (int i = 0; i < result.getRows(); ++i) {
@@ -143,7 +143,7 @@ public:
sum += (transpose_a ? a(k, i) : a(i, k)) *
(transpose_b ? b(j, k) : b(k, j));
result(i, j) =
activateX(sum + (bias == nullptr ? 0.0f : (*bias)(j)), type, alpha);
activateX(sum + (bias == nullptr ? 0.0f : (*bias)(i)), type, alpha);
}
}
return result;
@@ -162,18 +162,18 @@ public:
this->validateSameDimensions(a, b);
switch (type) {
case Loss::MSE:
return dmse(a, b);
return d_mse(a, b);
default:
throw std::invalid_argument("Unknown loss type");
}
}
Tensor1 axis_sum(const Tensor2 &m) override {
Tensor1 result(m.getCols(), 0.0f);
for (int i = 0; i < m.getCols(); ++i) {
Tensor1 result(m.getRows(), 0.0f);
for (int i = 0; i < m.getRows(); ++i) {
float sum = 0.0f;
for (int j = 0; j < m.getRows(); ++j)
sum += m(j, i);
for (int j = 0; j < m.getCols(); ++j)
sum += m(i, j);
result(i) = sum;
}
return result;

6
src/math/tensor/math.hpp
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@@ -64,9 +64,9 @@ public:
throw std::invalid_argument(
"Invalid matrix dimensions for multiplication");
};
void validateBiasDimensions(const M &a, const V &b, bool transpose) const {
if ((!transpose && a.getCols() != b.getSize()) ||
(transpose && a.getRows() != b.getSize()))
void validateBiasDimensions(const M &m, const V &v, bool transpose) const {
if ((transpose && (size_t)m.getCols() != v.getSize()) ||
(!transpose && (size_t)m.getRows() != v.getSize()))
throw std::invalid_argument("Invalid matrix bias");
};
};