Adaptive.cpp

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/*
Created on Fri Jun 26 14:13:26 2020
Copyright 2020 Peter Rakyta, Ph.D.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

@author: Peter Rakyta, Ph.D.
*/
#include "Adaptive.h"
#include "common.h"



//static tbb::spin_mutex my_mutex;
Adaptive::Adaptive() : CRY() {

    // A string labeling the gate operation
    name = "Adaptive";

    // A string describing the type of the gate
    type = ADAPTIVE_OPERATION;

    limit = 1;

}



Adaptive::Adaptive(int qbit_num_in, int target_qbit_in, int control_qbit_in) : CRY(qbit_num_in, target_qbit_in, control_qbit_in) {

    // A string labeling the gate operation
    name = "Adaptive";

    // A string describing the type of the gate
    type = ADAPTIVE_OPERATION;

    limit = 1;
}


Adaptive::Adaptive(int qbit_num_in, int target_qbit_in, int control_qbit_in, int limit_in) : CRY(qbit_num_in, target_qbit_in, control_qbit_in) {

    // A string labeling the gate operation
    name = "Adaptive";

    // A string describing the type of the gate
    type = ADAPTIVE_OPERATION;

    limit = limit_in;
}

Adaptive::~Adaptive() {

}




void 
Adaptive::apply_to( Matrix_real& parameters, Matrix& input, int parallel ) {


    if (input.rows != matrix_size ) {
        std::string err("Adaptive::apply_to: Wrong input size in Adaptive gate apply.");
        throw err;    
    }

    double Phi = parameters[0];

    Matrix_real Phi_transformed(1,1);
//    Phi_transformed[0] = Phi;
//    Phi_transformed[0] = 0.5*(1.0-std::cos(Phi))*M_PI;
    Phi = activation_function( Phi, limit );
    Phi_transformed[0] = Phi;


/*
Phi = Phi + M_PI;
Phi = (1.0-std::cos(Phi/2))*M_PI;
Phi_transformed[0] = Phi - M_PI;
*/



    CRY::apply_to( Phi_transformed, input, parallel );



}



void 
Adaptive::apply_from_right( Matrix_real& parameters, Matrix& input ) {


    if (input.cols != matrix_size ) {
        std::stringstream sstream;
     sstream << "Wrong matrix size in Adaptive apply_from_right" << std::endl;
        print(sstream, 0);    
        exit(-1);
    }

    double Phi = parameters[0];

    Matrix_real Phi_transformed(1,1);
//    Phi_transformed[0] = Phi;
//    Phi_transformed[0] = 0.5*(1.0-std::cos(Phi))*M_PI;
    Phi = activation_function( Phi, limit );
    Phi_transformed[0] = Phi;
/*
Phi = Phi + M_PI;
Phi = (1.0-std::cos(Phi/2))*M_PI;
Phi_transformed[0] = Phi - M_PI;
*/

    CRY::apply_from_right( Phi_transformed, input );


}



std::vector<Matrix>
Adaptive::apply_derivate_to( Matrix_real& parameters, Matrix& input, int parallel ) {

    if (input.rows != matrix_size ) {
        std::stringstream sstream;
     sstream << "Wrong matrix size in Adaptive gate apply" << std::endl;
        print(sstream, 0);         
        exit(-1);
    }

    double Phi = parameters[0];

    Matrix_real Phi_transformed(1,1);
//    Phi_transformed[0] = Phi;
//    Phi_transformed[0] = 0.5*(1.0-std::cos(Phi))*M_PI;
    Phi = activation_function( Phi, limit );
    Phi_transformed[0] = Phi;


/*
Phi = Phi + M_PI;
Phi = (1.0-std::cos(Phi/2))*M_PI;
Phi_transformed[0] = Phi - M_PI;
*/



    return CRY::apply_derivate_to( Phi_transformed, input, parallel );



}

Adaptive* Adaptive::clone() {

    Adaptive* ret = new Adaptive(qbit_num, target_qbit, control_qbit);
    
    ret->set_parameter_start_idx( get_parameter_start_idx() );
    ret->set_parents( parents );
    ret->set_children( children );

    ret->set_limit( limit );


    return ret;

}



Matrix_real 
Adaptive::extract_parameters( Matrix_real& parameters ) {

    if ( get_parameter_start_idx() + get_parameter_num() > parameters.size()  ) {
        std::string err("Adaptive::extract_parameters: Cant extract parameters, since the dinput arary has not enough elements.");
        throw err;     
    }

    Matrix_real extracted_parameters(1,1);

    extracted_parameters[0] = std::fmod( 2*parameters[ get_parameter_start_idx() ], 4*M_PI);

    return extracted_parameters;

}



void 
Adaptive::set_limit( int limit_in ) {

    limit = limit_in;

}


int 
Adaptive::get_limit() {

    return limit;
}