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Softmax + Categorical Crossentropy

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I fixed the activation+loss function, you can't select it directly, it automaticly uses it if it can. I also fixed one-hot generator. Still haven't tested the activation + loss nor any other backward function. I'll do that when I get to the optimizers which is next.
This commit is contained in:
Bausager
2026-08-06 09:53:03 +02:00
parent fecb4c70b1
commit 642bba1198
18 changed files with 627 additions and 378 deletions
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include/neural_network/activation/activation_relu.hpp
+10
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@@ -70,6 +70,16 @@ struct activation_relu : public layer{
*/
~activation_relu() = default;
/**
* @brief get_type function for layer
*
* @returns the layer type
*
*/
layer_type get_type() const override {
return layer_type::activation_relu;
}
/**
* @brief Forward function for layer
*
include/neural_network/activation/activation_softmax.hpp
+11
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@@ -70,6 +70,17 @@ struct activation_softmax : public layer{
*/
~activation_softmax() = default;
/**
* @brief get_type function for layer
*
* @returns the layer type
*
*/
layer_type get_type() const override {
return layer_type::activation_softmax;
}
/**
* @brief Forward function for layer
*
include/neural_network/activation_loss/activation_softmax_loss_categorical_crossentropy.hpp
+2 -40
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@@ -54,47 +54,9 @@ namespace panic{
*
* The struct is used in PANIC nural_network library.
*/
struct activation_softmax_loss_categorical_crossentropy: loss{
activation_softmax activation;
loss_categorical_crossentropy loss;
/**
* @brief Empthy constructor
*
*/
activation_softmax_loss_categorical_crossentropy();
/**
* @brief Default de-constructor
*
*/
~activation_softmax_loss_categorical_crossentropy() = default;
/**
* @brief forward function to calculate losses
*
* @param y_pred Matrix of model predection.
* @param y_true Vector of true label of data.
*
*/
bool forward(const panic::tensor::real_matrix& y_pred, const panic::tensor::uint_vector& y_true) override;
/**
* @brief forward function to calculate losses
*
* @param y_pred Matrix of model predection.
* @param y_true Vector of true label of data.
*
* @Note Overloaded if one-shot endcoded
* is used.
*/
bool forward(const panic::tensor::real_matrix& y_pred, const panic::tensor::real_matrix& y_true) override;
struct activation_softmax_loss_categorical_crossentropy{
panic::tensor::real_matrix dinputs;
/**
* @brief backward function to calculate from losses
include/neural_network/layer/layer.hpp
+19 -1
View File
@@ -44,6 +44,14 @@ namespace panic{
enum struct layer_type {
unknown,
layer_dense,
activation_relu,
activation_softmax
};
/**
* @brief Base layer for the rest of the neural network library to use
*
@@ -85,6 +93,16 @@ struct layer{
virtual ~layer() = default;
/**
* @brief Virtual layer_type function for derivative layers
*
* @Note This returns the type of layer it is
* unknown be default
*/
virtual layer_type get_type() const {
return layer_type::unknown;
}
/**
* @brief Virtual forward function for derivative layers
*
@@ -103,7 +121,7 @@ struct layer{
* @Note It's equal to 0 because it make the derivative
* object NEEDS to have these function to work.
*/
virtual bool backward(const panic::tensor::real_matrix& dinputs) = 0;
virtual bool backward(const panic::tensor::real_matrix& dvalues) = 0;
};
include/neural_network/layer/layer_dense.hpp
+10 -24
View File
@@ -58,30 +58,6 @@ namespace panic{
*/
struct layer_dense : trainable_layer{
/**
* @brief Emphty matrix to store input data
*
*/
panic::tensor::real_matrix ipnuts;
/**
* @brief Emphty weight matrix to store layer weights
*
* Weight shape:
* input_size x neuron_count
*/
panic::tensor::real_matrix weights;
panic::tensor::real_matrix dweights;
/**
* @brief Emphty bias vector to store layer bias
*
* Bias shape:
* 1 x neuron_count
*/
panic::tensor::real_vector biases;
panic::tensor::real_vector dbiases;
/**
* @brief Empthy constructor
*
@@ -103,6 +79,16 @@ struct layer_dense : trainable_layer{
*/
~layer_dense() = default;
/**
* @brief get_type function for layer
*
* @returns the layer type
*
*/
layer_type get_type() const override {
return layer_type::layer_dense;
}
/**
* @brief Forward function for layer
*
include/neural_network/loss/loss.hpp
+22 -11
View File
@@ -44,6 +44,11 @@ namespace panic{
namespace neural_network{
enum struct loss_type {
unknown,
categorical_crossentropy
};
/**
* @brief Base loss for the rest of the neural network library to use
@@ -58,7 +63,7 @@ namespace panic{
struct loss{
/**
* @brief Emphty vector to store sample losses
* @brief Emphty vector to store sample losses for each sample in the batch.
*
*/
panic::tensor::real_vector sample_losses;
@@ -66,19 +71,15 @@ struct loss{
/**
* @brief Mean loss over the entire batch.
*/
panic::types::real_t data_loss;
panic::types::real_t data_loss = 0;
/**
* @brief Matrix for backwards pass
* @brief Gradient with respect to the loss input.
*
* This will be used later during the backward pass.
*/
panic::tensor::real_matrix dinputs;
/**
* @brief Matrix for output of loss function
*/
panic::tensor::real_matrix outputs;
/**
* @brief Default de-constructor
*
@@ -86,6 +87,16 @@ struct loss{
virtual ~loss() = default;
/**
* @brief Virtual loss_type function for derivative losses
*
* @Note This returns the type of loss it is
* unknown be default
*/
virtual loss_type get_type() const {
return loss_type::unknown;
}
/**
* @brief Virtual forward function for derivative loss functions
*
@@ -146,7 +157,7 @@ struct loss{
* @param y_true Vector of true label of data.
*
*/
virtual bool calculate(
bool calculate(
const panic::tensor::real_matrix& y_pred,
const panic::tensor::uint_vector& y_true);
@@ -157,7 +168,7 @@ struct loss{
* @param y_true Matrix of true label of data.
*
*/
virtual bool calculate(
bool calculate(
const panic::tensor::real_matrix& y_pred,
const panic::tensor::real_matrix& y_true);
include/neural_network/loss/loss_categorical_crossentropy.hpp
+14 -15
View File
@@ -53,10 +53,17 @@ namespace panic{
*
* The struct is used for PANIC neural_network library.
*/
struct loss_categorical_crossentropy: loss{
struct loss_categorical_crossentropy: public loss{
/**
* @brief get_type function for loss
*
* @returns the loss type
*
*/
loss_type get_type() const override {
return loss_type::categorical_crossentropy;
}
/**
* @brief forward function to calculate losses
@@ -65,9 +72,7 @@ struct loss_categorical_crossentropy: loss{
* @param y_true Vector of true label of data.
*
*/
bool forward(
const panic::tensor::real_matrix& y_pred,
const panic::tensor::uint_vector& y_true)override;
bool forward(const panic::tensor::real_matrix& y_pred, const panic::tensor::uint_vector& y_true) override;
/**
* @brief forward function to calculate losses
@@ -78,9 +83,7 @@ struct loss_categorical_crossentropy: loss{
* @Note Overloaded if one-shot endcoded
* is used.
*/
bool forward(
const panic::tensor::real_matrix& y_pred,
const panic::tensor::real_matrix& y_true)override;
bool forward(const panic::tensor::real_matrix& y_pred, const panic::tensor::real_matrix& y_true) override;
/**
@@ -90,9 +93,7 @@ struct loss_categorical_crossentropy: loss{
* @param y_true Vector of true label of data.
*
*/
bool backward(
const panic::tensor::real_matrix& dvalues,
const panic::tensor::uint_vector& y_true) override;
bool backward(const panic::tensor::real_matrix& dvalues, const panic::tensor::uint_vector& y_true) override;
/**
* @brief backward function to calculate from losses
@@ -103,9 +104,7 @@ struct loss_categorical_crossentropy: loss{
* @Note Overloaded if one-shot endcoded
* is used.
*/
bool backward(
const panic::tensor::real_matrix& dvalues,
const panic::tensor::real_matrix& y_true) override;
bool backward(const panic::tensor::real_matrix& dvalues, const panic::tensor::real_matrix& y_true) override;
};
include/neural_network/model/model.hpp
+82 -42
View File
@@ -44,6 +44,7 @@
#include <neural_network/layer/layer_dense.hpp> // fully connected dense layer
#include <neural_network/loss/loss.hpp>
#include <neural_network/activation_loss/activation_softmax_loss_categorical_crossentropy.hpp>
#include <neural_network/optimizers/optimizer.hpp>
#include <neural_network/optimizers/optimizer_sgd.hpp>
@@ -71,44 +72,77 @@ namespace panic{
struct model{
/**
* @brief a pointer to a pointer of layers
* @brief Array of pointers to all model layers.
*
* An example:
* layers[0] points to a layer_dense
* layers[1] points to an actication function
* layers[2] points to another layer_dense
*
* @note The model owns these layers and deletes them in clear().
*
* Example:
* layers[0] points to a layer_dense
* layers[1] points to an activation_ReLU
* layers[2] points to another layer_dense
*
* @note The model owns every object referenced by this array.
* clear() deletes each layer and then deletes the array.
*/
layer** layers;
/**
* @brief Number of layers currently stored in layers.
*/
panic::types::uint_t layer_count;
/**
* @brief Array of pointers to the trainable layers.
*
* @note These pointers refer to objects already owned through layers.
* Do not delete the individual objects through this array.
* Only the pointer array itself is owned separately.
*/
trainable_layer** trainable_layers;
/**
* @brief Number of trainable-layer pointers.
*/
panic::types::uint_t trainable_layer_count;
/**
* @brief Configured loss function.
*
* @note The model owns this object and deletes it in clear().
*/
loss* loss_function;
/**
* @brief Configured optimizer.
*
* @note The model owns this object and deletes it in clear().
*/
optimizer* optimizer_function;
/**
* @brief a pointer the loss function
* @brief Optimized backward helper for the combination of
* Softmax and categorical cross-entropy.
*
*
* @note The model owns these layers and deletes them in clear().
*
* This is a normal member object, not a dynamically allocated object.
*/
loss* loss_function;
activation_softmax_loss_categorical_crossentropy softmax_classifier_output;
// Number of layers currently stored in the model.
/**
* @brief Stores the number of layers
*
* @brief Whether the optimized Softmax + categorical
* cross-entropy backward path should be used.
*/
panic::types::uint_t layer_count;
bool use_softmax_classifier_output;
// model output (may be deleted and also used for debug)
/**
* @brief Output of the final model layer.
*/
panic::tensor::real_matrix outputs;
// model dinputs (may be deleted and also used for debug)
/**
* @brief Gradient with respect to the model input.
*/
panic::tensor::real_matrix dinputs;
/**
@@ -231,16 +265,32 @@ struct model{
*
* Computes:
* @code
* model.bacward(dvalues_data_matrix)
* model.backward(model_output, y_true_values)
* @endcode
*
* @param dvalues diput data.
* @param output Model output.
* @param y_true True values for data.
*
* @return true looped over every layer.
*
*
*/
bool backward(const panic::tensor::real_matrix& dvalues);
bool backward(const panic::tensor::real_matrix& output, const panic::tensor::uint_vector& y_true);
/**
* @brief Loops over all layers backward function
*
* Computes:
* @code
* model.backward(model_output, y_true_values)
* @endcode
*
* @param output Model output.
* @param y_true True values for data.
*
* @return true looped over every layer.
*
*/
bool backward(const panic::tensor::real_matrix& output, const panic::tensor::real_matrix& y_true);
/**
@@ -259,24 +309,6 @@ struct model{
bool add_loss_categorical_crossentropy();
/**
* @brief Adds activation softmax AND loss for categorical crossentropy.
*
* Computes:
* @code
* model.activation_softmax_loss_categorical_crossentropy();
* @endcode
*
*
* @return true if activation and loss is added
*
* @note This function is convenient, but it allocates a new layer.
*/
bool activation_softmax_loss_categorical_crossentropy();
/**
* @brief Adds optimizer_sgd to the model
*
@@ -295,7 +327,15 @@ struct model{
/**
* @brief Finalizes the model configuration.
*
* Detects whether the model can use the optimized
* Softmax + categorical-cross-entropy backward pass.
*
* @return true if the model configuration is valid.
*/
bool finalize();
/**
* @brief Trains the model with input data