mapping_handler.f90

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!
module mapping_handler
  use neko_config, only: neko_bcknd_device
  use num_types, only: rp
  use mapping, only: mapping_wrapper_t, mapping_t, &
       mapping_factory
  use field, only: field_t
  use field_list, only: field_list_t
  use json_utils, only: json_get, json_extract_item, json_get_or_default
  use json_module, only: json_file
  use coefs, only: coef_t
  use user_intf, only: user_t
  use field_math, only: field_rzero, field_copy
  use math, only: col2
  use device_math, only: device_col2
  use scratch_registry, only: neko_scratch_registry
  use utils, only: neko_warning
  use vector, only:vector_t
  use neko_ext, only: field_to_vector, vector_to_field
  use gather_scatter, only : gs_op_add
  implicit none
  private
 
  type, public :: mapping_handler_t
     class(mapping_wrapper_t), allocatable :: mapping_cascade(:)
     type(coef_t), pointer :: coef
 
   contains
     procedure, pass(this) :: init_base => mapping_handler_init_base
     procedure, pass(this) :: free => mapping_handler_free
     generic :: apply_forward => mapping_handler_apply_forward_field, &
          mapping_handler_apply_forward_vector
     procedure, pass(this) :: mapping_handler_apply_forward_field
     procedure, pass(this) :: mapping_handler_apply_forward_vector
     generic :: apply_backward => mapping_handler_apply_backward_field, &
          mapping_handler_apply_backward_vector
     procedure, pass(this) :: mapping_handler_apply_backward_field
     procedure, pass(this) :: mapping_handler_apply_backward_vector
     generic :: add => add_mapping, add_json_mappings
     procedure, pass(this) :: add_mapping => &
          mapping_handler_add_mapping
     procedure, pass(this) :: add_json_mappings => &
          mapping_handler_add_json_mappings
     procedure, pass(this) :: make_cts => mapping_handler_make_cts
  end type mapping_handler_t
 
contains
 
  subroutine mapping_handler_init_base(this, coef)
    class(mapping_handler_t), intent(inout) :: this
    type(coef_t), target, intent(in) :: coef
 
    call this%free()
 
    this%coef => coef
 
  end subroutine mapping_handler_init_base
 
 
  subroutine mapping_handler_free(this)
    class(mapping_handler_t), intent(inout) :: this
    integer :: i
 
    if (allocated(this%mapping_cascade)) then
       do i = 1, size(this%mapping_cascade)
          call this%mapping_cascade(i)%free()
       end do
       deallocate(this%mapping_cascade)
    end if
 
  end subroutine mapping_handler_free
 
  subroutine mapping_handler_apply_forward_field(this, X_out, X_in)
    class(mapping_handler_t), intent(inout) :: this
    type(field_t), intent(in) :: X_in
    type(field_t), intent(inout) :: X_out
    integer :: i
    type(field_t), pointer :: tmp_fld_in, tmp_fld_out
    integer :: temp_indices(2)
 
    call neko_scratch_registry%request_field(tmp_fld_in, temp_indices(1), &
         .false.)
    call neko_scratch_registry%request_field(tmp_fld_out, temp_indices(2), &
         .false.)
 
    ! Start by copying the first X_in into the tmp_fld_out to begin the
    ! cascade.
    call field_copy(tmp_fld_out, x_in)
 
    ! enforce continuity in the field
    call this%make_cts(tmp_fld_out)
 
    ! We enter the cascade
    if (allocated(this%mapping_cascade)) then
       do i = 1, size(this%mapping_cascade)
          ! the output from one mapping becomes the input for the next.
          call field_copy(tmp_fld_in, tmp_fld_out)
          ! apply the mapping on temp_fld
          call this%mapping_cascade(i)%mapping%apply_forward(tmp_fld_out, &
               tmp_fld_in)
 
       end do
 
    end if
 
    ! our final mapping should now live in tmp_fld_out
    call field_copy(x_out, tmp_fld_out)
 
    ! free the scratch.
    call neko_scratch_registry%relinquish_field(temp_indices)
 
  end subroutine mapping_handler_apply_forward_field
 
  subroutine mapping_handler_apply_forward_vector(this, X_out, X_in)
    class(mapping_handler_t), intent(inout) :: this
    type(vector_t), intent(in) :: X_in
    type(vector_t), intent(inout) :: X_out
    type(field_t), pointer :: tmp_fld_in, tmp_fld_out
    integer :: temp_indices(2)
 
    call neko_scratch_registry%request_field(tmp_fld_in, temp_indices(1), &
         .false.)
    call neko_scratch_registry%request_field(tmp_fld_out, temp_indices(2), &
         .false.)
 
    call vector_to_field(tmp_fld_in, x_in)
    call mapping_handler_apply_forward_field(this, tmp_fld_out, tmp_fld_in)
    call field_to_vector(x_out, tmp_fld_out)
 
    ! free the scratch.
    call neko_scratch_registry%relinquish_field(temp_indices)
 
  end subroutine mapping_handler_apply_forward_vector
 
  subroutine mapping_handler_apply_backward_field(this, sens_out, sens_in)
    class(mapping_handler_t), intent(inout) :: this
    type(field_t), intent(inout) :: sens_out
    type(field_t), intent(in) :: sens_in
    integer :: i
    type(field_t), pointer :: tmp_fld_in, tmp_fld_out
    integer :: temp_indices(2)
 
    call neko_scratch_registry%request_field(tmp_fld_in, temp_indices(1), &
         .false.)
    call neko_scratch_registry%request_field(tmp_fld_out, temp_indices(2), &
         .false.)
 
    ! Start by copying the first sens_in into the tmp_fld_out to begin the
    ! cascade.
    call field_copy(tmp_fld_out, sens_in)
 
    ! enforce continuity in the field
    call this%make_cts(tmp_fld_out)
 
    ! We enter the cascade
    if (allocated(this%mapping_cascade)) then
       do i = size(this%mapping_cascade), 1, -1
          ! the output from one mapping becomes the input for the next.
          call field_copy(tmp_fld_in, tmp_fld_out)
          ! apply the mapping on temp_fld
          ! NOTE
          ! all the X_in that is required to map backward should be held
          ! internally by each mapping
          call this%mapping_cascade(i)%mapping%apply_backward(tmp_fld_out, &
               tmp_fld_in)
 
       end do
 
    end if
 
    ! post-multiply by mass matrix
    if (neko_bcknd_device .eq. 1) then
       call device_col2(tmp_fld_out%x_d, this%coef%B_d, tmp_fld_out%size())
    else
       call col2(tmp_fld_out%x, this%coef%B, tmp_fld_out%size())
    end if
 
    ! our final mapping should now live in tmp_fld_out
    call field_copy(sens_out, tmp_fld_out)
 
    ! free the scratch.
    call neko_scratch_registry%relinquish_field(temp_indices)
 
 
  end subroutine mapping_handler_apply_backward_field
 
  subroutine mapping_handler_apply_backward_vector(this, X_out, X_in)
    class(mapping_handler_t), intent(inout) :: this
    type(vector_t), intent(in) :: X_in
    type(vector_t), intent(inout) :: X_out
    type(field_t), pointer :: tmp_fld_in, tmp_fld_out
    integer :: temp_indices(2)
 
    call neko_scratch_registry%request_field(tmp_fld_in, temp_indices(1), &
         .false.)
    call neko_scratch_registry%request_field(tmp_fld_out, temp_indices(2), &
         .false.)
 
    call vector_to_field(tmp_fld_in, x_in)
    call mapping_handler_apply_backward_field(this, tmp_fld_out, tmp_fld_in)
    call field_to_vector(x_out, tmp_fld_out)
 
    ! free the scratch.
    call neko_scratch_registry%relinquish_field(temp_indices)
 
  end subroutine mapping_handler_apply_backward_vector
 
  subroutine mapping_handler_add_json_mappings(this, json, name)
    class(mapping_handler_t), intent(inout) :: this
    type(json_file), intent(inout) :: json
    character(len=*), intent(in) :: name
 
    class(mapping_wrapper_t), dimension(:), allocatable :: temp
 
    ! A single mapping as its own json_file.
    type(json_file) :: mapping_subdict
    integer :: n_mappings, i, i0
 
    if (json%valid_path(name)) then
       ! Get the number of mapping_cascade.
       call json%info(name, n_children = n_mappings)
 
       if (allocated(this%mapping_cascade)) then
          i0 = size(this%mapping_cascade)
          call move_alloc(this%mapping_cascade, temp)
          allocate(this%mapping_cascade(i0 + n_mappings))
          if (allocated(temp)) then
             do i = 1, i0
                call move_alloc(temp(i)%mapping, &
                     this%mapping_cascade(i)%mapping)
             end do
          end if
       else
          i0 = 0
          allocate(this%mapping_cascade(n_mappings))
       end if
 
       do i = 1, n_mappings
          ! Create a new json containing just the subdict for this mapping.
          call json_extract_item(json, name, i, mapping_subdict)
          call mapping_factory(this%mapping_cascade(i + i0)%mapping, &
               mapping_subdict, this%coef)
       end do
    else
       ! I was considering an error, but maybe a warning is more appropriate
       call neko_warning("No mappings selected")
    end if
 
  end subroutine mapping_handler_add_json_mappings
 
  subroutine mapping_handler_add_mapping(this, mapping)
    class(mapping_handler_t), intent(inout) :: this
    class(mapping_t), intent(in) :: mapping
    class(mapping_wrapper_t), dimension(:), allocatable :: temp
 
    integer :: n_mappings, i
 
    if (allocated(this%mapping_cascade)) then
       n_mappings = size(this%mapping_cascade)
    else
       n_mappings = 0
    end if
 
    call move_alloc(this%mapping_cascade, temp)
    allocate(this%mapping_cascade(n_mappings + 1))
 
    if (allocated(temp)) then
       do i = 1, n_mappings
          call move_alloc(temp(i)%mapping, this%mapping_cascade(i)%mapping)
       end do
    end if
 
    this%mapping_cascade(n_mappings + 1)%mapping = mapping
 
  end subroutine mapping_handler_add_mapping
 
  subroutine mapping_handler_make_cts(this, fld)
    class(mapping_handler_t), intent(inout) :: this
    type(field_t), intent(inout) :: fld
 
    call this%coef%gs_h%op(fld, gs_op_add)
    if (neko_bcknd_device .eq. 1) then
       call device_col2(fld%x_d, this%coef%mult_d, fld%size())
    else
       call col2(fld%x, this%coef%mult, fld%size())
    end if
 
  end subroutine mapping_handler_make_cts
end module mapping_handler