| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | !!!############################################################################# | ||
| 2 | !!! Code written by Ned Thaddeus Taylor | ||
| 3 | !!! Code part of the ATHENA library - a feedforward neural network library | ||
| 4 | !!!############################################################################# | ||
| 5 | !!! module contains implementation of a 2D maxpooling layer | ||
| 6 | !!!############################################################################# | ||
| 7 | module maxpool2d_layer | ||
| 8 | use constants, only: real12 | ||
| 9 | use base_layer, only: pool_layer_type | ||
| 10 | implicit none | ||
| 11 | |||
| 12 | |||
| 13 | type, extends(pool_layer_type) :: maxpool2d_layer_type | ||
| 14 | real(real12), allocatable, dimension(:,:,:,:) :: output | ||
| 15 | real(real12), allocatable, dimension(:,:,:,:) :: di ! gradient of input (i.e. delta) | ||
| 16 | contains | ||
| 17 | procedure, pass(this) :: get_output => get_output_maxpool2d | ||
| 18 | procedure, pass(this) :: init => init_maxpool2d | ||
| 19 | procedure, pass(this) :: set_batch_size => set_batch_size_maxpool2d | ||
| 20 | procedure, pass(this) :: print => print_maxpool2d | ||
| 21 | procedure, pass(this) :: forward => forward_rank | ||
| 22 | procedure, pass(this) :: backward => backward_rank | ||
| 23 | procedure, private, pass(this) :: forward_4d | ||
| 24 | procedure, private, pass(this) :: backward_4d | ||
| 25 | end type maxpool2d_layer_type | ||
| 26 | |||
| 27 | |||
| 28 | interface maxpool2d_layer_type | ||
| 29 | module function layer_setup( & | ||
| 30 | input_shape, batch_size, & | ||
| 31 | pool_size, stride) result(layer) | ||
| 32 | integer, dimension(:), optional, intent(in) :: input_shape | ||
| 33 | integer, optional, intent(in) :: batch_size | ||
| 34 | integer, dimension(..), optional, intent(in) :: pool_size | ||
| 35 | integer, dimension(..), optional, intent(in) :: stride | ||
| 36 | type(maxpool2d_layer_type) :: layer | ||
| 37 | end function layer_setup | ||
| 38 | end interface maxpool2d_layer_type | ||
| 39 | |||
| 40 | |||
| 41 | private | ||
| 42 | public :: maxpool2d_layer_type | ||
| 43 | public :: read_maxpool2d_layer | ||
| 44 | |||
| 45 | |||
| 46 | contains | ||
| 47 | |||
| 48 | !!!############################################################################# | ||
| 49 | !!! get layer outputs | ||
| 50 | !!!############################################################################# | ||
| 51 | 3 | pure subroutine get_output_maxpool2d(this, output) | |
| 52 | implicit none | ||
| 53 | class(maxpool2d_layer_type), intent(in) :: this | ||
| 54 | real(real12), allocatable, dimension(..), intent(out) :: output | ||
| 55 | |||
| 56 | select rank(output) | ||
| 57 | rank(1) | ||
| 58 |
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6 | output = reshape(this%output, [size(this%output)]) |
| 59 | rank(2) | ||
| 60 | output = & | ||
| 61 |
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6 | reshape(this%output, [product(this%output_shape),this%batch_size]) |
| 62 | rank(4) | ||
| 63 |
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|
221 | output = this%output |
| 64 | end select | ||
| 65 | |||
| 66 | 3 | end subroutine get_output_maxpool2d | |
| 67 | !!!############################################################################# | ||
| 68 | |||
| 69 | |||
| 70 | !!!##########################################################################!!! | ||
| 71 | !!! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * !!! | ||
| 72 | !!!##########################################################################!!! | ||
| 73 | |||
| 74 | |||
| 75 | !!!############################################################################# | ||
| 76 | !!! forward propagation assumed rank handler | ||
| 77 | !!!############################################################################# | ||
| 78 | 1 | pure subroutine forward_rank(this, input) | |
| 79 | implicit none | ||
| 80 | class(maxpool2d_layer_type), intent(inout) :: this | ||
| 81 | real(real12), dimension(..), intent(in) :: input | ||
| 82 | |||
| 83 | select rank(input); rank(4) | ||
| 84 | 1 | call forward_4d(this, input) | |
| 85 | end select | ||
| 86 | 1 | end subroutine forward_rank | |
| 87 | !!!############################################################################# | ||
| 88 | |||
| 89 | |||
| 90 | !!!############################################################################# | ||
| 91 | !!! backward propagation assumed rank handler | ||
| 92 | !!!############################################################################# | ||
| 93 | 1 | pure subroutine backward_rank(this, input, gradient) | |
| 94 | implicit none | ||
| 95 | class(maxpool2d_layer_type), intent(inout) :: this | ||
| 96 | real(real12), dimension(..), intent(in) :: input | ||
| 97 | real(real12), dimension(..), intent(in) :: gradient | ||
| 98 | |||
| 99 | select rank(input); rank(4) | ||
| 100 | 1 | select rank(gradient); rank(4) | |
| 101 | 1 | call backward_4d(this, input, gradient) | |
| 102 | end select | ||
| 103 | end select | ||
| 104 | 1 | end subroutine backward_rank | |
| 105 | !!!############################################################################# | ||
| 106 | |||
| 107 | |||
| 108 | !!!##########################################################################!!! | ||
| 109 | !!! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * !!! | ||
| 110 | !!!##########################################################################!!! | ||
| 111 | |||
| 112 | |||
| 113 | !!!############################################################################# | ||
| 114 | !!! set up layer | ||
| 115 | !!!############################################################################# | ||
| 116 | #if defined(GFORTRAN) | ||
| 117 | module function layer_setup( & | ||
| 118 | input_shape, batch_size, & | ||
| 119 | pool_size, stride) result(layer) | ||
| 120 | implicit none | ||
| 121 | integer, dimension(:), optional, intent(in) :: input_shape | ||
| 122 | integer, optional, intent(in) :: batch_size | ||
| 123 | integer, dimension(..), optional, intent(in) :: pool_size | ||
| 124 | integer, dimension(..), optional, intent(in) :: stride | ||
| 125 | |||
| 126 | type(maxpool2d_layer_type) :: layer | ||
| 127 | #else | ||
| 128 |
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5 | module procedure layer_setup |
| 129 | implicit none | ||
| 130 | #endif | ||
| 131 | |||
| 132 | |||
| 133 |
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5 | layer%name = "maxpool2d" |
| 134 | 5 | layer%input_rank = 3 | |
| 135 | allocate( & | ||
| 136 | ✗ | layer%pool(layer%input_rank-1), & | |
| 137 |
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5 | layer%strd(layer%input_rank-1) ) |
| 138 | !!----------------------------------------------------------------------- | ||
| 139 | !! set up pool size | ||
| 140 | !!----------------------------------------------------------------------- | ||
| 141 |
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5 | if(present(pool_size))then |
| 142 | 4 | select rank(pool_size) | |
| 143 | rank(0) | ||
| 144 |
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6 | layer%pool = pool_size |
| 145 | rank(1) | ||
| 146 |
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2 | layer%pool(1) = pool_size(1) |
| 147 |
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4 | if(size(pool_size,dim=1).eq.1)then |
| 148 |
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1 | layer%pool(2) = pool_size(1) |
| 149 |
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1 | elseif(size(pool_size,dim=1).eq.2)then |
| 150 |
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1 | layer%pool(2) = pool_size(2) |
| 151 | end if | ||
| 152 | end select | ||
| 153 | else | ||
| 154 |
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3 | layer%pool = 2 |
| 155 | end if | ||
| 156 | |||
| 157 | |||
| 158 | !!----------------------------------------------------------------------- | ||
| 159 | !! set up stride | ||
| 160 | !!----------------------------------------------------------------------- | ||
| 161 |
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5 | if(present(stride))then |
| 162 | 4 | select rank(stride) | |
| 163 | rank(0) | ||
| 164 |
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6 | layer%strd = stride |
| 165 | rank(1) | ||
| 166 |
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2 | layer%strd(1) = stride(1) |
| 167 |
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4 | if(size(stride,dim=1).eq.1)then |
| 168 |
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1 | layer%strd(2) = stride(1) |
| 169 |
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1 | elseif(size(stride,dim=1).eq.2)then |
| 170 |
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1 | layer%strd(2) = stride(2) |
| 171 | end if | ||
| 172 | end select | ||
| 173 | else | ||
| 174 |
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3 | layer%strd = 2 |
| 175 | end if | ||
| 176 | |||
| 177 | |||
| 178 | !!-------------------------------------------------------------------------- | ||
| 179 | !! initialise batch size | ||
| 180 | !!-------------------------------------------------------------------------- | ||
| 181 |
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5 | if(present(batch_size)) layer%batch_size = batch_size |
| 182 | |||
| 183 | |||
| 184 | !!-------------------------------------------------------------------------- | ||
| 185 | !! initialise layer shape | ||
| 186 | !!-------------------------------------------------------------------------- | ||
| 187 |
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5 | if(present(input_shape)) call layer%init(input_shape=input_shape) |
| 188 | |||
| 189 | #if defined(GFORTRAN) | ||
| 190 | end function layer_setup | ||
| 191 | #else | ||
| 192 |
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10 | end procedure layer_setup |
| 193 | #endif | ||
| 194 | !!!############################################################################# | ||
| 195 | |||
| 196 | |||
| 197 | !!!############################################################################# | ||
| 198 | !!! initialise layer | ||
| 199 | !!!############################################################################# | ||
| 200 |
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1 | subroutine init_maxpool2d(this, input_shape, batch_size, verbose) |
| 201 | implicit none | ||
| 202 | class(maxpool2d_layer_type), intent(inout) :: this | ||
| 203 | integer, dimension(:), intent(in) :: input_shape | ||
| 204 | integer, optional, intent(in) :: batch_size | ||
| 205 | integer, optional, intent(in) :: verbose | ||
| 206 | |||
| 207 | integer :: verbose_ = 0 | ||
| 208 | |||
| 209 | |||
| 210 | !!-------------------------------------------------------------------------- | ||
| 211 | !! initialise optional arguments | ||
| 212 | !!-------------------------------------------------------------------------- | ||
| 213 |
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1 | if(present(verbose)) verbose_ = verbose |
| 214 |
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1 | if(present(batch_size)) this%batch_size = batch_size |
| 215 | |||
| 216 | |||
| 217 | !!-------------------------------------------------------------------------- | ||
| 218 | !! initialise input shape | ||
| 219 | !!-------------------------------------------------------------------------- | ||
| 220 |
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1 | if(.not.allocated(this%input_shape)) call this%set_shape(input_shape) |
| 221 | |||
| 222 | |||
| 223 | !!----------------------------------------------------------------------- | ||
| 224 | !! set up number of channels, width, height | ||
| 225 | !!----------------------------------------------------------------------- | ||
| 226 |
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1 | this%num_channels = this%input_shape(3) |
| 227 |
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1 | allocate(this%output_shape(3)) |
| 228 |
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1 | this%output_shape(3) = this%input_shape(3) |
| 229 | 5 | this%output_shape(:2) = & | |
| 230 |
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3 | floor( (this%input_shape(:2) - this%pool)/real(this%strd)) + 1 |
| 231 | |||
| 232 | |||
| 233 | !!-------------------------------------------------------------------------- | ||
| 234 | !! initialise batch size-dependent arrays | ||
| 235 | !!-------------------------------------------------------------------------- | ||
| 236 |
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1 | if(this%batch_size.gt.0) call this%set_batch_size(this%batch_size) |
| 237 | |||
| 238 | 1 | end subroutine init_maxpool2d | |
| 239 | !!!############################################################################# | ||
| 240 | |||
| 241 | |||
| 242 | !!!############################################################################# | ||
| 243 | !!! set batch size | ||
| 244 | !!!############################################################################# | ||
| 245 | 1 | subroutine set_batch_size_maxpool2d(this, batch_size, verbose) | |
| 246 | implicit none | ||
| 247 | class(maxpool2d_layer_type), intent(inout) :: this | ||
| 248 | integer, intent(in) :: batch_size | ||
| 249 | integer, optional, intent(in) :: verbose | ||
| 250 | |||
| 251 | integer :: verbose_ = 0 | ||
| 252 | |||
| 253 | |||
| 254 | !!-------------------------------------------------------------------------- | ||
| 255 | !! initialise optional arguments | ||
| 256 | !!-------------------------------------------------------------------------- | ||
| 257 |
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1 | if(present(verbose)) verbose_ = verbose |
| 258 | 1 | this%batch_size = batch_size | |
| 259 | |||
| 260 | |||
| 261 | !!-------------------------------------------------------------------------- | ||
| 262 | !! allocate arrays | ||
| 263 | !!-------------------------------------------------------------------------- | ||
| 264 |
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1 | if(allocated(this%input_shape))then |
| 265 |
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1 | if(allocated(this%output)) deallocate(this%output) |
| 266 | ✗ | allocate(this%output( & | |
| 267 | 2 | this%output_shape(1), & | |
| 268 | 2 | this%output_shape(2), this%num_channels, & | |
| 269 | this%batch_size), & | ||
| 270 |
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221 | source=0._real12) |
| 271 |
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1 | if(allocated(this%di)) deallocate(this%di) |
| 272 | ✗ | allocate(this%di( & | |
| 273 | 2 | this%input_shape(1), & | |
| 274 | 2 | this%input_shape(2), & | |
| 275 | 2 | this%input_shape(3), & | |
| 276 | this%batch_size), & | ||
| 277 |
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|
1031 | source=0._real12) |
| 278 | end if | ||
| 279 | |||
| 280 | 1 | end subroutine set_batch_size_maxpool2d | |
| 281 | !!!############################################################################# | ||
| 282 | |||
| 283 | |||
| 284 | !!!##########################################################################!!! | ||
| 285 | !!! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * !!! | ||
| 286 | !!!##########################################################################!!! | ||
| 287 | |||
| 288 | |||
| 289 | !!!############################################################################# | ||
| 290 | !!! print layer to file | ||
| 291 | !!!############################################################################# | ||
| 292 | ✗ | subroutine print_maxpool2d(this, file) | |
| 293 | implicit none | ||
| 294 | class(maxpool2d_layer_type), intent(in) :: this | ||
| 295 | character(*), intent(in) :: file | ||
| 296 | |||
| 297 | integer :: unit | ||
| 298 | |||
| 299 | !! open file with new unit | ||
| 300 | !!-------------------------------------------------------------------------- | ||
| 301 | ✗ | open(newunit=unit, file=trim(file), access='append') | |
| 302 | |||
| 303 | !! write convolution initial parameters | ||
| 304 | !!-------------------------------------------------------------------------- | ||
| 305 | ✗ | write(unit,'("MAXPOOL2D")') | |
| 306 | ✗ | write(unit,'(3X,"INPUT_SHAPE = ",3(1X,I0))') this%input_shape | |
| 307 | ✗ | if(all(this%pool.eq.this%pool(1)))then | |
| 308 | ✗ | write(unit,'(3X,"POOL_SIZE =",1X,I0)') this%pool(1) | |
| 309 | else | ||
| 310 | ✗ | write(unit,'(3X,"POOL_SIZE =",2(1X,I0))') this%pool | |
| 311 | end if | ||
| 312 | ✗ | if(all(this%strd.eq.this%strd(1)))then | |
| 313 | ✗ | write(unit,'(3X,"STRIDE =",1X,I0)') this%strd(1) | |
| 314 | else | ||
| 315 | ✗ | write(unit,'(3X,"STRIDE =",2(1X,I0))') this%strd | |
| 316 | end if | ||
| 317 | ✗ | write(unit,'("END MAXPOOL2D")') | |
| 318 | |||
| 319 | !! close unit | ||
| 320 | !!-------------------------------------------------------------------------- | ||
| 321 | ✗ | close(unit) | |
| 322 | |||
| 323 | ✗ | end subroutine print_maxpool2d | |
| 324 | !!!############################################################################# | ||
| 325 | |||
| 326 | |||
| 327 | !!!############################################################################# | ||
| 328 | !!! read layer from file | ||
| 329 | !!!############################################################################# | ||
| 330 | ✗ | function read_maxpool2d_layer(unit) result(layer) | |
| 331 | use infile_tools, only: assign_val, assign_vec | ||
| 332 | use misc, only: to_lower, icount | ||
| 333 | implicit none | ||
| 334 | integer, intent(in) :: unit | ||
| 335 | |||
| 336 | class(maxpool2d_layer_type), allocatable :: layer | ||
| 337 | |||
| 338 | integer :: stat | ||
| 339 | integer :: itmp1 | ||
| 340 | integer, dimension(2) :: pool_size, stride | ||
| 341 | integer, dimension(3) :: input_shape | ||
| 342 | character(256) :: buffer, tag | ||
| 343 | |||
| 344 | |||
| 345 | !! loop over tags in layer card | ||
| 346 | ✗ | tag_loop: do | |
| 347 | |||
| 348 | !! check for end of file | ||
| 349 | ✗ | read(unit,'(A)',iostat=stat) buffer | |
| 350 | ✗ | if(stat.ne.0)then | |
| 351 | ✗ | write(0,*) "ERROR: file encountered error (EoF?) before END MAXPOOL2D" | |
| 352 | ✗ | stop "Exiting..." | |
| 353 | end if | ||
| 354 | ✗ | if(trim(adjustl(buffer)).eq."") cycle tag_loop | |
| 355 | |||
| 356 | !! check for end of convolution card | ||
| 357 | ✗ | if(trim(adjustl(buffer)).eq."END MAXPOOL2D")then | |
| 358 | ✗ | backspace(unit) | |
| 359 | ✗ | exit tag_loop | |
| 360 | end if | ||
| 361 | |||
| 362 | ✗ | tag=trim(adjustl(buffer)) | |
| 363 | ✗ | if(scan(buffer,"=").ne.0) tag=trim(tag(:scan(tag,"=")-1)) | |
| 364 | |||
| 365 | !! read parameters from save file | ||
| 366 | ✗ | select case(trim(tag)) | |
| 367 | case("INPUT_SHAPE") | ||
| 368 | ✗ | call assign_vec(buffer, input_shape, itmp1) | |
| 369 | case("POOL_SIZE") | ||
| 370 | ✗ | call assign_vec(buffer, pool_size, itmp1) | |
| 371 | case("STRIDE") | ||
| 372 | ✗ | call assign_vec(buffer, stride, itmp1) | |
| 373 | case default | ||
| 374 | !! don't look for "e" due to scientific notation of numbers | ||
| 375 | !! ... i.e. exponent (E+00) | ||
| 376 | ✗ | if(scan(to_lower(trim(adjustl(buffer))),& | |
| 377 | 'abcdfghijklmnopqrstuvwxyz').eq.0)then | ||
| 378 | ✗ | cycle tag_loop | |
| 379 | ✗ | elseif(tag(:3).eq.'END')then | |
| 380 | ✗ | cycle tag_loop | |
| 381 | end if | ||
| 382 | ✗ | stop "Unrecognised line in input file: "//trim(adjustl(buffer)) | |
| 383 | end select | ||
| 384 | end do tag_loop | ||
| 385 | |||
| 386 | !! set transfer activation function | ||
| 387 | |||
| 388 | layer = maxpool2d_layer_type( input_shape=input_shape, & | ||
| 389 | pool_size = pool_size, stride = stride & | ||
| 390 | ✗ | ) | |
| 391 | |||
| 392 | !! check for end of layer card | ||
| 393 | ✗ | read(unit,'(A)') buffer | |
| 394 | ✗ | if(trim(adjustl(buffer)).ne."END MAXPOOL2D")then | |
| 395 | ✗ | write(*,*) trim(adjustl(buffer)) | |
| 396 | ✗ | stop "ERROR: END MAXPOOL2D not where expected" | |
| 397 | end if | ||
| 398 | |||
| 399 | ✗ | end function read_maxpool2d_layer | |
| 400 | !!!############################################################################# | ||
| 401 | |||
| 402 | |||
| 403 | !!!##########################################################################!!! | ||
| 404 | !!! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * !!! | ||
| 405 | !!!##########################################################################!!! | ||
| 406 | |||
| 407 | |||
| 408 | !!!############################################################################# | ||
| 409 | !!! forward propagation | ||
| 410 | !!!############################################################################# | ||
| 411 | 5 | pure subroutine forward_4d(this, input) | |
| 412 | implicit none | ||
| 413 | class(maxpool2d_layer_type), intent(inout) :: this | ||
| 414 |
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1 | real(real12), dimension( & |
| 415 |
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1 | this%input_shape(1), & |
| 416 | this%input_shape(2), & | ||
| 417 | this%num_channels, & | ||
| 418 | this%batch_size), & | ||
| 419 | intent(in) :: input | ||
| 420 | |||
| 421 | integer :: i, j, m, s | ||
| 422 | integer, dimension(2) :: stride_idx | ||
| 423 | |||
| 424 | |||
| 425 |
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|
221 | this%output = 0._real12 |
| 426 | !! perform the pooling operation | ||
| 427 | do concurrent(& | ||
| 428 | s = 1:this%batch_size, & | ||
| 429 | m = 1:this%num_channels, & | ||
| 430 | 2 | j = 1:this%output_shape(2), & | |
| 431 |
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1 | i = 1:this%output_shape(1)) |
| 432 | #if defined(GFORTRAN) | ||
| 433 | stride_idx = ([i,j] - 1) * this%strd + 1 | ||
| 434 | #else | ||
| 435 |
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192 | stride_idx(1) = (i-1) * this%strd(1) + 1 |
| 436 |
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192 | stride_idx(2) = (j-1) * this%strd(2) + 1 |
| 437 | #endif | ||
| 438 | 1536 | this%output(i, j, m, s) = maxval(& | |
| 439 |
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384 | input( & |
| 440 | 384 | stride_idx(1):stride_idx(1)+this%pool(1)-1, & | |
| 441 |
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|
3145 | stride_idx(2):stride_idx(2)+this%pool(2)-1, m, s)) |
| 442 | end do | ||
| 443 | |||
| 444 | 1 | end subroutine forward_4d | |
| 445 | !!!############################################################################# | ||
| 446 | |||
| 447 | |||
| 448 | !!!############################################################################# | ||
| 449 | !!! backward propagation | ||
| 450 | !!!############################################################################# | ||
| 451 | 9 | pure subroutine backward_4d(this, input, gradient) | |
| 452 | implicit none | ||
| 453 | class(maxpool2d_layer_type), intent(inout) :: this | ||
| 454 |
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1 | real(real12), dimension( & |
| 455 |
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1 | this%input_shape(1), & |
| 456 | this%input_shape(2), & | ||
| 457 | this%num_channels, & | ||
| 458 | this%batch_size), & | ||
| 459 | intent(in) :: input | ||
| 460 | real(real12), & | ||
| 461 |
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1 | dimension(& |
| 462 |
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1 | this%output_shape(1), & |
| 463 | this%output_shape(2), & | ||
| 464 | this%num_channels, & | ||
| 465 | this%batch_size), & | ||
| 466 | intent(in) :: gradient | ||
| 467 | |||
| 468 | integer :: i, j, m, s | ||
| 469 | integer, dimension(2) :: stride_idx, max_idx | ||
| 470 | |||
| 471 | |||
| 472 |
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|
1031 | this%di = 0._real12 |
| 473 | !! compute gradients for input feature map | ||
| 474 | do concurrent( & | ||
| 475 | s = 1:this%batch_size, & | ||
| 476 | m = 1:this%num_channels, & | ||
| 477 | 2 | j = 1:this%output_shape(2), & | |
| 478 |
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1 | i = 1:this%output_shape(1)) |
| 479 | #if defined(GFORTRAN) | ||
| 480 | stride_idx = ([i,j] - 1) * this%strd | ||
| 481 | #else | ||
| 482 |
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192 | stride_idx(1) = (i-1) * this%strd(1) |
| 483 |
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192 | stride_idx(2) = (j-1) * this%strd(2) |
| 484 | #endif | ||
| 485 | !! find the index of the maximum value in the corresponding pooling window | ||
| 486 | ✗ | max_idx = maxloc(input( & | |
| 487 | 384 | stride_idx(1)+1:stride_idx(1)+this%pool(1), & | |
| 488 |
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192 | stride_idx(2)+1:stride_idx(2)+this%pool(2), m, s)) |
| 489 | |||
| 490 | !! compute gradients for input feature map | ||
| 491 | 1536 | this%di( & | |
| 492 | stride_idx(1)+max_idx(1), & | ||
| 493 | stride_idx(2)+max_idx(2), m, s) = & | ||
| 494 | 1536 | this%di( & | |
| 495 | stride_idx(1)+max_idx(1), & | ||
| 496 |
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|
457 | stride_idx(2)+max_idx(2), m, s) + gradient(i, j, m, s) |
| 497 | |||
| 498 | end do | ||
| 499 | |||
| 500 | 1 | end subroutine backward_4d | |
| 501 | !!!############################################################################# | ||
| 502 | |||
| 503 |
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|
48 | end module maxpool2d_layer |
| 504 | !!!############################################################################# | ||
| 505 |