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

#include "hidden_layer.h"
#include "../activation/activation.h"
#include "../lin_alg/lin_alg.h"
#include "../utilities/utilities.h"

#include <iostream>
#include <random>


MLPPHiddenLayer::MLPPHiddenLayer(int n_hidden, std::string activation, std::vector<std::vector<double>> input, std::string weightInit, std::string reg, double lambda, double alpha) :
		n_hidden(n_hidden), activation(activation), input(input), weightInit(weightInit), reg(reg), lambda(lambda), alpha(alpha) {
	weights = MLPPUtilities::weightInitialization(input[0].size(), n_hidden, weightInit);
	bias = MLPPUtilities::biasInitialization(n_hidden);

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	activation_map["Arcoth"] = &MLPPActivation::arcoth;
	activationTest_map["Arcoth"] = &MLPPActivation::arcoth;
}

void MLPPHiddenLayer::forwardPass() {
	MLPPLinAlg alg;
	MLPPActivation avn;
	z = alg.mat_vec_add(alg.matmult(input, weights), bias);
	a = (avn.*activation_map[activation])(z, 0);
}

void MLPPHiddenLayer::Test(std::vector<double> x) {
	MLPPLinAlg alg;
	MLPPActivation avn;
	z_test = alg.addition(alg.mat_vec_mult(alg.transpose(weights), x), bias);
	a_test = (avn.*activationTest_map[activation])(z_test, 0);
}