ft_example_vector.cpp

This example show how to output a vector in FasTensor .

Author

Bin Dong (dbin@.nosp@m.lbl..nosp@m.gov)

Version

0.1

Date

2021-05-28

Copyright

Copyright (c) 2021

/*
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FasTensor (FT) Copyright (c) 2021, The Regents of the University of
California, through Lawrence Berkeley National Laboratory (subject to
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All rights reserved.
 
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please contact Berkeley Lab's Intellectual Property Office at
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NOTICE.  This Software was developed under funding from the U.S. Department
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such, the U.S. Government has been granted for itself and others acting on
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Software to reproduce, distribute copies to the public, prepare derivative 
works, and perform publicly and display publicly, and to permit others to do so.
 
 
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*** License Agreement ***
 
FasTensor (FT) Copyright (c) 2021, The Regents of the University of
California, through Lawrence Berkeley National Laboratory (subject to
receipt of any required approvals from the U.S. Dept. of Energy). 
All rights reserved.
 
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*/
 
#include <iostream>
#include <stdarg.h>
#include <vector>
#include <stdlib.h>
#include "ft.h"
 
using namespace std;
using namespace FT;
 
#define VEC_SIZE 8
 
inline Stencil<std::vector<float>> udf_vector(const Stencil<float> &iStencil)
{
 
    Stencil<std::vector<float>> oStencil;
    std::vector<float> temp_vec(VEC_SIZE);
 
    for (int i = 0; i < VEC_SIZE; i++)
    {
        temp_vec[i] = iStencil(0, i) * 2.0;
    }
    oStencil = temp_vec;
 
    std::vector<size_t> vector_shape(2);
    vector_shape[0] = 1;
    vector_shape[1] = VEC_SIZE;
    oStencil.SetShape(vector_shape);
    return oStencil;
}
 
int main(int argc, char *argv[])
{
    //Init the MPICH, etc.
    AU_Init(argc, argv);
 
    // set up the chunk size and the overlap size
    std::vector<int> chunk_size = {4, 16};
    std::vector<int> overlap_size = {0, 0};
 
    //Orginal data set
    FT::Array<float> *A = new Array<float>("EP_HDF5:./test-data/testf-16x16-vector.h5:/testg/testd", chunk_size, overlap_size);
 
    //Results data to be stored in a file
    FT::Array<float> *B = new Array<float>("EP_HDF5:./test-data/testf-16x16-vector-output.h5:/testg/testd");
 
    //Set the direction to flat vector of output
    //A->SetVectorDirection(AU_FLAT_OUTPUT_ROW);
 
    //Skip paramter, run the udf_vector on the first cell of each row
    std::vector<int> skip_size = {1, 16};
    A->EnableApplyStride(skip_size);
 
    //Run udf_vector
    A->Transform(udf_vector, B);
 
    //Clear
    delete A;
    delete B;
 
    AU_Finalize();
 
    return 0;
}