pmlpp/mlpp/softmax_net/softmax_net.h

#ifndef MLPP_SOFTMAX_NET_H
#define MLPP_SOFTMAX_NET_H

//
//  SoftmaxNet.hpp
//
//  Created by Marc Melikyan on 10/2/20.
//

#include "core/math/math_defs.h"

#include <string>
#include <vector>



class MLPPSoftmaxNet {
public:
	MLPPSoftmaxNet(std::vector<std::vector<real_t>> inputSet, std::vector<std::vector<real_t>> outputSet, int n_hidden, std::string reg = "None", real_t lambda = 0.5, real_t alpha = 0.5);
	std::vector<real_t> modelTest(std::vector<real_t> x);
	std::vector<std::vector<real_t>> modelSetTest(std::vector<std::vector<real_t>> X);
	void gradientDescent(real_t learning_rate, int max_epoch, bool UI = 1);
	void SGD(real_t learning_rate, int max_epoch, bool UI = 1);
	void MBGD(real_t learning_rate, int max_epoch, int mini_batch_size, bool UI = 1);
	real_t score();
	void save(std::string fileName);

	std::vector<std::vector<real_t>> getEmbeddings(); // This class is used (mostly) for word2Vec. This function returns our embeddings.
private:
	real_t Cost(std::vector<std::vector<real_t>> y_hat, std::vector<std::vector<real_t>> y);

	std::vector<std::vector<real_t>> Evaluate(std::vector<std::vector<real_t>> X);
	std::tuple<std::vector<std::vector<real_t>>, std::vector<std::vector<real_t>>> propagate(std::vector<std::vector<real_t>> X);
	std::vector<real_t> Evaluate(std::vector<real_t> x);
	std::tuple<std::vector<real_t>, std::vector<real_t>> propagate(std::vector<real_t> x);
	void forwardPass();

	std::vector<std::vector<real_t>> inputSet;
	std::vector<std::vector<real_t>> outputSet;
	std::vector<std::vector<real_t>> y_hat;

	std::vector<std::vector<real_t>> weights1;
	std::vector<std::vector<real_t>> weights2;

	std::vector<real_t> bias1;
	std::vector<real_t> bias2;

	std::vector<std::vector<real_t>> z2;
	std::vector<std::vector<real_t>> a2;

	int n;
	int k;
	int n_class;
	int n_hidden;

	// Regularization Params
	std::string reg;
	real_t lambda;
	real_t alpha; /* This is the controlling param for Elastic Net*/
};


#endif /* SoftmaxNet_hpp */