init_dropout Subroutine

  subroutine init_dropout(this, input_shape, verbose)
    !! Initialise dropout layer
    implicit none

    ! Arguments
    class(dropout_layer_type), intent(inout) :: this
    !! Instance of the dropout layer
    integer, dimension(:), intent(in) :: input_shape
    !! Input shape
    integer, optional, intent(in) :: verbose
    !! Verbosity level

    ! Local variables
    integer :: verbose_ = 0
    !! Verbosity level


    !---------------------------------------------------------------------------
    ! Initialise optional arguments
    !---------------------------------------------------------------------------
    if(present(verbose)) verbose_ = verbose


    !---------------------------------------------------------------------------
    ! Initialise input shape
    !---------------------------------------------------------------------------
    if(.not.allocated(this%input_shape)) call this%set_shape(input_shape)


    !---------------------------------------------------------------------------
    ! Set up number of channels, width, height
    !---------------------------------------------------------------------------
    allocate(this%output_shape(2))
    this%output_shape = this%input_shape


    !---------------------------------------------------------------------------
    ! Allocate mask
    !---------------------------------------------------------------------------
    allocate(this%mask(this%input_shape(1), this%num_masks), source=.true.)


    !---------------------------------------------------------------------------
    ! Generate mask
    !---------------------------------------------------------------------------
    call this%generate_mask()


    !---------------------------------------------------------------------------
    ! Generate mask
    !---------------------------------------------------------------------------
    if(this%use_graph_input)then
       call stop_program( &
            "Graph input not supported for dropout layer" &
       )
       return
    end if
    if(allocated(this%output)) deallocate(this%output)
    allocate( this%output(1,1) )

  end subroutine init_dropout