ガウス過程と機械学習 第1章 linear.py

202004262249.jl

# ==================================================================================================================================
# ISBN 978-4-06-152926-7
# ガウス過程と機械学習
# [reference]
# http://chasen.org/~daiti-m/gpbook/python/linear.py
# http://chasen.org/~daiti-m/gpbook/data/linear.dat
# ==================================================================================================================================


module ISBN9784061529267

    import Printf
    export main


    mutable struct LearningData
        size :: Core.Int64
        x    :: Base.Vector{Core.Float64}
        y    :: Base.Vector{Core.Float64}
    end


    function read_data(file_path::Core.AbstractString)

        # step.01
        # open file
        fstream = Base.open(Base.joinpath( Base.pwd() , file_path ), "r")

        # step.02
        # read all lines as Core.String
        data = Base.readlines(fstream)

        # step.03
        # initialize variables/arrays to store read data
        size     = Base.size(data, 1)
        buffer_x = Base.zeros(Core.Float64, size)
        buffer_y = Base.zeros(Core.Float64, size)

        # step.04
        # convert the read data from Core.String to Core.Float64
        for itr = 1:1:size
            buffer = Base.split(data[itr],"\t")
            buffer_x[itr] = Base.parse(Core.Float64, buffer[1])
            buffer_y[itr] = Base.parse(Core.Float64, buffer[2])
        end

        # step.05
        # close the file
        Base.close(fstream)

        return LearningData(size, buffer_x, buffer_y)

    end


    function show_data(obj::LearningData)

        for itr = 1:1obj.size
            Printf.@printf("%2d %5.2f %5.2f\n", itr, obj.x[itr], obj.y[itr])
        end

    end


    function main()

        obj = read_data("downloaded\\chap02\\linear.dat")
        show_data(obj)

    end

end


# ==================================================================================================================================


@time ISBN9784061529267.main()


# ==================================================================================================================================
# EOF
# ==================================================================================================================================