//
//  OutputLayer.cpp
//
//  Created by Marc Melikyan on 11/4/20.
//

#include "output_layer.h"
#include "../lin_alg/lin_alg.h"
#include "../utilities/utilities.h"

#include <iostream>
#include <random>


OutputLayer::OutputLayer(int n_hidden, std::string activation, std::string cost, std::vector<std::vector<double>> input, std::string weightInit, std::string reg, double lambda, double alpha) :
		n_hidden(n_hidden), activation(activation), cost(cost), input(input), weightInit(weightInit), reg(reg), lambda(lambda), alpha(alpha) {
	weights = Utilities::weightInitialization(n_hidden, weightInit);
	bias = Utilities::biasInitialization();

	activation_map["Linear"] = &Activation::linear;
	activationTest_map["Linear"] = &Activation::linear;

	activation_map["Sigmoid"] = &Activation::sigmoid;
	activationTest_map["Sigmoid"] = &Activation::sigmoid;

	activation_map["Swish"] = &Activation::swish;
	activationTest_map["Swish"] = &Activation::swish;

	activation_map["Mish"] = &Activation::mish;
	activationTest_map["Mish"] = &Activation::mish;

	activation_map["SinC"] = &Activation::sinc;
	activationTest_map["SinC"] = &Activation::sinc;

	activation_map["Softplus"] = &Activation::softplus;
	activationTest_map["Softplus"] = &Activation::softplus;

	activation_map["Softsign"] = &Activation::softsign;
	activationTest_map["Softsign"] = &Activation::softsign;

	activation_map["CLogLog"] = &Activation::cloglog;
	activationTest_map["CLogLog"] = &Activation::cloglog;

	activation_map["Logit"] = &Activation::logit;
	activationTest_map["Logit"] = &Activation::logit;

	activation_map["GaussianCDF"] = &Activation::gaussianCDF;
	activationTest_map["GaussianCDF"] = &Activation::gaussianCDF;

	activation_map["RELU"] = &Activation::RELU;
	activationTest_map["RELU"] = &Activation::RELU;

	activation_map["GELU"] = &Activation::GELU;
	activationTest_map["GELU"] = &Activation::GELU;

	activation_map["Sign"] = &Activation::sign;
	activationTest_map["Sign"] = &Activation::sign;

	activation_map["UnitStep"] = &Activation::unitStep;
	activationTest_map["UnitStep"] = &Activation::unitStep;

	activation_map["Sinh"] = &Activation::sinh;
	activationTest_map["Sinh"] = &Activation::sinh;

	activation_map["Cosh"] = &Activation::cosh;
	activationTest_map["Cosh"] = &Activation::cosh;

	activation_map["Tanh"] = &Activation::tanh;
	activationTest_map["Tanh"] = &Activation::tanh;

	activation_map["Csch"] = &Activation::csch;
	activationTest_map["Csch"] = &Activation::csch;

	activation_map["Sech"] = &Activation::sech;
	activationTest_map["Sech"] = &Activation::sech;

	activation_map["Coth"] = &Activation::coth;
	activationTest_map["Coth"] = &Activation::coth;

	activation_map["Arsinh"] = &Activation::arsinh;
	activationTest_map["Arsinh"] = &Activation::arsinh;

	activation_map["Arcosh"] = &Activation::arcosh;
	activationTest_map["Arcosh"] = &Activation::arcosh;

	activation_map["Artanh"] = &Activation::artanh;
	activationTest_map["Artanh"] = &Activation::artanh;

	activation_map["Arcsch"] = &Activation::arcsch;
	activationTest_map["Arcsch"] = &Activation::arcsch;

	activation_map["Arsech"] = &Activation::arsech;
	activationTest_map["Arsech"] = &Activation::arsech;

	activation_map["Arcoth"] = &Activation::arcoth;
	activationTest_map["Arcoth"] = &Activation::arcoth;

	costDeriv_map["MSE"] = &Cost::MSEDeriv;
	cost_map["MSE"] = &Cost::MSE;
	costDeriv_map["RMSE"] = &Cost::RMSEDeriv;
	cost_map["RMSE"] = &Cost::RMSE;
	costDeriv_map["MAE"] = &Cost::MAEDeriv;
	cost_map["MAE"] = &Cost::MAE;
	costDeriv_map["MBE"] = &Cost::MBEDeriv;
	cost_map["MBE"] = &Cost::MBE;
	costDeriv_map["LogLoss"] = &Cost::LogLossDeriv;
	cost_map["LogLoss"] = &Cost::LogLoss;
	costDeriv_map["CrossEntropy"] = &Cost::CrossEntropyDeriv;
	cost_map["CrossEntropy"] = &Cost::CrossEntropy;
	costDeriv_map["HingeLoss"] = &Cost::HingeLossDeriv;
	cost_map["HingeLoss"] = &Cost::HingeLoss;
	costDeriv_map["WassersteinLoss"] = &Cost::HingeLossDeriv;
	cost_map["WassersteinLoss"] = &Cost::HingeLoss;
}

void OutputLayer::forwardPass() {
	LinAlg alg;
	Activation avn;
	z = alg.scalarAdd(bias, alg.mat_vec_mult(input, weights));
	a = (avn.*activation_map[activation])(z, 0);
}

void OutputLayer::Test(std::vector<double> x) {
	LinAlg alg;
	Activation avn;
	z_test = alg.dot(weights, x) + bias;
	a_test = (avn.*activationTest_map[activation])(z_test, 0);
}