| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | module athena__maxpool2d_layer | ||
| 2 | !! Module containing implementation of a 2D max pooling layer | ||
| 3 | !! | ||
| 4 | !! This module implements 2D max pooling for downsampling spatial dimensions | ||
| 5 | !! by selecting maximum values within pooling windows. | ||
| 6 | !! | ||
| 7 | !! Mathematical operation: | ||
| 8 | !! output[i,j,k] = max_{m∈[0,pool_h), n∈[0,pool_w)} input[i*stride+m, j*stride+n, k] | ||
| 9 | !! | ||
| 10 | !! where: | ||
| 11 | !! (i,j) are output spatial coordinates | ||
| 12 | !! k is the channel index | ||
| 13 | !! (pool_h, pool_w) is the pooling window size | ||
| 14 | !! stride controls the step size | ||
| 15 | !! | ||
| 16 | !! Reduces spatial dimensions while preserving important features. | ||
| 17 | !! Shape: (width, height, channels) -> (width//stride, height//stride, channels) | ||
| 18 | use coreutils, only: real32, stop_program | ||
| 19 | use athena__base_layer, only: pool_layer_type, base_layer_type | ||
| 20 | use athena__pad2d_layer, only: pad2d_layer_type | ||
| 21 | use athena__misc_types, only: & | ||
| 22 | onnx_node_type, onnx_initialiser_type, onnx_tensor_type | ||
| 23 | use diffstruc, only: array_type | ||
| 24 | use athena__diffstruc_extd, only: maxpool2d | ||
| 25 | implicit none | ||
| 26 | |||
| 27 | |||
| 28 | private | ||
| 29 | |||
| 30 | public :: maxpool2d_layer_type | ||
| 31 | public :: read_maxpool2d_layer | ||
| 32 | |||
| 33 | |||
| 34 | type, extends(pool_layer_type) :: maxpool2d_layer_type | ||
| 35 | !! Type for 2D max pooling layer with overloaded procedures | ||
| 36 | contains | ||
| 37 | procedure, pass(this) :: set_hyperparams => set_hyperparams_maxpool2d | ||
| 38 | !! Set hyperparameters for 2D max pooling layer | ||
| 39 | procedure, pass(this) :: read => read_maxpool2d | ||
| 40 | !! Read 2D max pooling layer from file | ||
| 41 | procedure, pass(this) :: build_from_onnx => build_from_onnx_maxpool2d | ||
| 42 | !! Build 2D max pooling layer from ONNX node and initialiser | ||
| 43 | |||
| 44 | procedure, pass(this) :: forward => forward_maxpool2d | ||
| 45 | !! Forward propagation derived type handler | ||
| 46 | |||
| 47 | end type maxpool2d_layer_type | ||
| 48 | |||
| 49 | interface maxpool2d_layer_type | ||
| 50 | !! Interface for setting up the 2D max pooling layer | ||
| 51 | module function layer_setup( input_shape, & | ||
| 52 | pool_size, stride, padding, verbose ) result(layer) | ||
| 53 | !! Set up the 2D max pooling layer | ||
| 54 | integer, dimension(:), optional, intent(in) :: input_shape | ||
| 55 | !! Input shape | ||
| 56 | integer, dimension(..), optional, intent(in) :: pool_size | ||
| 57 | !! Pool size | ||
| 58 | integer, dimension(..), optional, intent(in) :: stride | ||
| 59 | !! Stride | ||
| 60 | character(*), optional, intent(in) :: padding | ||
| 61 | !! Padding | ||
| 62 | integer, optional, intent(in) :: verbose | ||
| 63 | !! Verbosity level | ||
| 64 | type(maxpool2d_layer_type) :: layer | ||
| 65 | !! Instance of the 2D max pooling layer | ||
| 66 | end function layer_setup | ||
| 67 | end interface maxpool2d_layer_type | ||
| 68 | |||
| 69 | |||
| 70 | |||
| 71 | contains | ||
| 72 | |||
| 73 | !!!############################################################################# | ||
| 74 | !!! set up layer | ||
| 75 | !!!############################################################################# | ||
| 76 | 10 | module function layer_setup( & | |
| 77 |
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10 | input_shape, & |
| 78 | 10 | pool_size, stride, padding, verbose) result(layer) | |
| 79 | !! Set up the 2D max pooling layer | ||
| 80 | implicit none | ||
| 81 | |||
| 82 | ! Arguments | ||
| 83 | integer, dimension(:), optional, intent(in) :: input_shape | ||
| 84 | !! Input shape | ||
| 85 | integer, dimension(..), optional, intent(in) :: pool_size | ||
| 86 | !! Pool size | ||
| 87 | integer, dimension(..), optional, intent(in) :: stride | ||
| 88 | !! Stride | ||
| 89 | character(*), optional, intent(in) :: padding | ||
| 90 | !! Padding | ||
| 91 | integer, optional, intent(in) :: verbose | ||
| 92 | !! Verbosity level | ||
| 93 | |||
| 94 | type(maxpool2d_layer_type) :: layer | ||
| 95 | !! Instance of the 2D max pooling layer | ||
| 96 | |||
| 97 | ! Local variables | ||
| 98 | integer :: verbose_ = 0 | ||
| 99 | !! Verbosity level | ||
| 100 | integer, dimension(2) :: pool_size_, stride_ | ||
| 101 | !! Pool size and stride | ||
| 102 | character(len=20) :: padding_ | ||
| 103 | !! Padding | ||
| 104 | |||
| 105 |
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10 | if(present(verbose)) verbose_ = verbose |
| 106 | |||
| 107 | |||
| 108 | !--------------------------------------------------------------------------- | ||
| 109 | ! Set up pool size | ||
| 110 | !--------------------------------------------------------------------------- | ||
| 111 |
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10 | if(present(pool_size))then |
| 112 | 7 | select rank(pool_size) | |
| 113 | rank(0) | ||
| 114 |
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9 | pool_size_ = pool_size |
| 115 | rank(1) | ||
| 116 |
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4 | pool_size_(1) = pool_size(1) |
| 117 |
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8 | if(size(pool_size,dim=1).eq.1)then |
| 118 |
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1 | pool_size_(2) = pool_size(1) |
| 119 |
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3 | elseif(size(pool_size,dim=1).eq.2)then |
| 120 |
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3 | pool_size_(2) = pool_size(2) |
| 121 | end if | ||
| 122 | end select | ||
| 123 | else | ||
| 124 |
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9 | pool_size_ = 2 |
| 125 | end if | ||
| 126 | |||
| 127 | |||
| 128 | !--------------------------------------------------------------------------- | ||
| 129 | ! Set up stride | ||
| 130 | !--------------------------------------------------------------------------- | ||
| 131 |
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10 | if(present(stride))then |
| 132 | 7 | select rank(stride) | |
| 133 | rank(0) | ||
| 134 |
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9 | stride_ = stride |
| 135 | rank(1) | ||
| 136 |
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4 | stride_(1) = stride(1) |
| 137 |
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8 | if(size(stride,dim=1).eq.1)then |
| 138 |
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1 | stride_(2) = stride(1) |
| 139 |
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3 | elseif(size(stride,dim=1).eq.2)then |
| 140 |
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3 | stride_(2) = stride(2) |
| 141 | end if | ||
| 142 | end select | ||
| 143 | else | ||
| 144 |
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9 | stride_ = 2 |
| 145 | end if | ||
| 146 | |||
| 147 | |||
| 148 | !--------------------------------------------------------------------------- | ||
| 149 | ! Set up padding | ||
| 150 | !--------------------------------------------------------------------------- | ||
| 151 |
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10 | if(present(padding))then |
| 152 |
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2 | padding_ = padding |
| 153 | else | ||
| 154 | 8 | padding_ = "valid" | |
| 155 | end if | ||
| 156 | |||
| 157 | |||
| 158 | !--------------------------------------------------------------------------- | ||
| 159 | ! Set hyperparameters | ||
| 160 | !--------------------------------------------------------------------------- | ||
| 161 | call layer%set_hyperparams( & | ||
| 162 | pool_size=pool_size_, stride=stride_, & | ||
| 163 | padding=padding_, verbose=verbose_ & | ||
| 164 | 10 | ) | |
| 165 | |||
| 166 | |||
| 167 | !--------------------------------------------------------------------------- | ||
| 168 | ! Initialise layer shape | ||
| 169 | !--------------------------------------------------------------------------- | ||
| 170 |
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10 | if(present(input_shape)) call layer%init(input_shape=input_shape) |
| 171 | |||
| 172 |
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20 | end function layer_setup |
| 173 | !############################################################################### | ||
| 174 | |||
| 175 | |||
| 176 | !############################################################################### | ||
| 177 | 12 | subroutine set_hyperparams_maxpool2d( & | |
| 178 | this, pool_size, stride, padding, verbose & | ||
| 179 | ) | ||
| 180 | !! Set hyperparameters for 2D max pooling layer | ||
| 181 | use coreutils, only: to_lower | ||
| 182 | implicit none | ||
| 183 | |||
| 184 | ! Arguments | ||
| 185 | class(maxpool2d_layer_type), intent(inout) :: this | ||
| 186 | !! Instance of the 2D max pooling layer | ||
| 187 | integer, dimension(2), intent(in) :: pool_size | ||
| 188 | !! Pool size | ||
| 189 | integer, dimension(2), intent(in) :: stride | ||
| 190 | !! Stride | ||
| 191 | character(*), optional, intent(in) :: padding | ||
| 192 | !! Padding | ||
| 193 | integer, optional, intent(in) :: verbose | ||
| 194 | !! Verbosity level | ||
| 195 | |||
| 196 | ! Local variables | ||
| 197 | character(len=20) :: padding_ | ||
| 198 | |||
| 199 |
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12 | this%name = "maxpool2d" |
| 200 | 12 | this%type = "pool" | |
| 201 | 12 | this%subtype = "max" | |
| 202 | 12 | this%input_rank = 3 | |
| 203 | 12 | this%output_rank = 3 | |
| 204 |
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12 | if(allocated(this%pool)) deallocate(this%pool) |
| 205 |
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12 | if(allocated(this%strd)) deallocate(this%strd) |
| 206 | allocate( & | ||
| 207 | ✗ | this%pool(this%input_rank-1), & | |
| 208 | ✗ | this%strd(this%input_rank-1) & | |
| 209 |
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12 | ) |
| 210 |
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48 | this%pool = pool_size |
| 211 |
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48 | this%strd = stride |
| 212 | |||
| 213 | ! Handle padding | ||
| 214 |
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12 | if(present(padding))then |
| 215 |
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11 | padding_ = trim(adjustl(padding)) |
| 216 | else | ||
| 217 | 1 | padding_ = "valid" | |
| 218 | end if | ||
| 219 | |||
| 220 | 35 | select case(trim(adjustl(to_lower(padding_)))) | |
| 221 | case("valid", "none", "") | ||
| 222 | case default | ||
| 223 | this%pad_layer = pad2d_layer_type( & | ||
| 224 | 4 | padding = [ (this%pool-1)/2 ], & | |
| 225 | method = padding_ & | ||
| 226 |
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43 | ) |
| 227 | end select | ||
| 228 | |||
| 229 |
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12 | end subroutine set_hyperparams_maxpool2d |
| 230 | !############################################################################### | ||
| 231 | |||
| 232 | |||
| 233 | !##############################################################################! | ||
| 234 | ! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ! | ||
| 235 | !##############################################################################! | ||
| 236 | |||
| 237 | |||
| 238 | !############################################################################### | ||
| 239 | 1 | subroutine read_maxpool2d(this, unit, verbose) | |
| 240 | !! Read 2D max pooling layer from file | ||
| 241 | use athena__tools_infile, only: assign_val, assign_vec | ||
| 242 | use coreutils, only: to_lower, to_upper, icount | ||
| 243 | implicit none | ||
| 244 | |||
| 245 | ! Arguments | ||
| 246 | class(maxpool2d_layer_type), intent(inout) :: this | ||
| 247 | !! Instance of the 2D max pooling layer | ||
| 248 | integer, intent(in) :: unit | ||
| 249 | !! File unit | ||
| 250 | integer, optional, intent(in) :: verbose | ||
| 251 | !! Verbosity level | ||
| 252 | |||
| 253 | ! Local variables | ||
| 254 | integer :: verbose_ = 0 | ||
| 255 | !! Verbosity level | ||
| 256 | integer :: stat | ||
| 257 | !! File status | ||
| 258 | integer :: itmp1 | ||
| 259 | !! Temporary integer | ||
| 260 | integer, dimension(2) :: pool_size, stride | ||
| 261 | !! Pool size and stride | ||
| 262 | integer, dimension(3) :: input_shape | ||
| 263 | !! Input shape | ||
| 264 | character(256) :: buffer, tag, err_msg | ||
| 265 | !! Buffer for reading lines, tag for identifying lines, error message | ||
| 266 | |||
| 267 | |||
| 268 | ! Initialise optional arguments | ||
| 269 | !--------------------------------------------------------------------------- | ||
| 270 |
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1 | if(present(verbose)) verbose_ = verbose |
| 271 | |||
| 272 | |||
| 273 | ! Loop over tags in layer card | ||
| 274 | !--------------------------------------------------------------------------- | ||
| 275 | 3 | tag_loop: do | |
| 276 | |||
| 277 | ! Check for end of file | ||
| 278 | !------------------------------------------------------------------------ | ||
| 279 | 4 | read(unit,'(A)',iostat=stat) buffer | |
| 280 |
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4 | if(stat.ne.0)then |
| 281 | write(err_msg,'("file encountered error (EoF?) before END ",A)') & | ||
| 282 | ✗ | to_upper(this%name) | |
| 283 | ✗ | call stop_program(err_msg) | |
| 284 | ✗ | return | |
| 285 | end if | ||
| 286 |
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4 | if(trim(adjustl(buffer)).eq."") cycle tag_loop |
| 287 | |||
| 288 | ! Check for end of layer card | ||
| 289 | !------------------------------------------------------------------------ | ||
| 290 |
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8 | if(trim(adjustl(buffer)).eq."END "//to_upper(trim(this%name)))then |
| 291 | 1 | backspace(unit) | |
| 292 | 4 | exit tag_loop | |
| 293 | end if | ||
| 294 | |||
| 295 |
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3 | tag=trim(adjustl(buffer)) |
| 296 |
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3 | if(scan(buffer,"=").ne.0) tag=trim(tag(:scan(tag,"=")-1)) |
| 297 | |||
| 298 | ! Read parameters from save file | ||
| 299 | !------------------------------------------------------------------------ | ||
| 300 | 6 | select case(trim(tag)) | |
| 301 | case("INPUT_SHAPE") | ||
| 302 | 1 | call assign_vec(buffer, input_shape, itmp1) | |
| 303 | case("POOL_SIZE") | ||
| 304 | 1 | call assign_vec(buffer, pool_size, itmp1) | |
| 305 | case("STRIDE") | ||
| 306 | 1 | call assign_vec(buffer, stride, itmp1) | |
| 307 | case default | ||
| 308 | ! Don't look for "e" due to scientific notation of numbers | ||
| 309 | ! ... i.e. exponent (E+00) | ||
| 310 | ✗ | if(scan(to_lower(trim(adjustl(buffer))),& | |
| 311 | 'abcdfghijklmnopqrstuvwxyz').eq.0)then | ||
| 312 | ✗ | cycle tag_loop | |
| 313 | ✗ | elseif(tag(:3).eq.'END')then | |
| 314 | ✗ | cycle tag_loop | |
| 315 | end if | ||
| 316 | write(err_msg,'("Unrecognised line in input file: ",A)') & | ||
| 317 | ✗ | trim(adjustl(buffer)) | |
| 318 | ✗ | call stop_program(err_msg) | |
| 319 |
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6 | return |
| 320 | end select | ||
| 321 | end do tag_loop | ||
| 322 | |||
| 323 | |||
| 324 | ! Set hyperparameters and initialise layer | ||
| 325 | !--------------------------------------------------------------------------- | ||
| 326 | 1 | call this%set_hyperparams(pool_size=pool_size, stride=stride) | |
| 327 | 1 | call this%init(input_shape = input_shape) | |
| 328 | |||
| 329 | |||
| 330 | ! Check for end of layer card | ||
| 331 | !--------------------------------------------------------------------------- | ||
| 332 | 1 | read(unit,'(A)') buffer | |
| 333 |
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2 | if(trim(adjustl(buffer)).ne."END "//to_upper(trim(this%name)))then |
| 334 | ✗ | write(0,*) trim(adjustl(buffer)) | |
| 335 | ✗ | write(err_msg,'("END ",A," not where expected")') to_upper(this%name) | |
| 336 | ✗ | call stop_program(err_msg) | |
| 337 | 1 | return | |
| 338 | end if | ||
| 339 | |||
| 340 | end subroutine read_maxpool2d | ||
| 341 | !############################################################################### | ||
| 342 | |||
| 343 | |||
| 344 | !############################################################################### | ||
| 345 | 1 | function read_maxpool2d_layer(unit, verbose) result(layer) | |
| 346 | !! Read 2D max pooling layer from file and return layer | ||
| 347 | implicit none | ||
| 348 | |||
| 349 | ! Arguments | ||
| 350 | integer, intent(in) :: unit | ||
| 351 | !! File unit | ||
| 352 | integer, optional, intent(in) :: verbose | ||
| 353 | !! Verbosity level | ||
| 354 | class(base_layer_type), allocatable :: layer | ||
| 355 | !! Instance of the 2D max pooling layer | ||
| 356 | |||
| 357 | ! Local variables | ||
| 358 | integer :: verbose_ = 0 | ||
| 359 | !! Verbosity level | ||
| 360 | |||
| 361 |
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1 | if(present(verbose)) verbose_ = verbose |
| 362 |
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|
2 | allocate(layer, source=maxpool2d_layer_type()) |
| 363 | 1 | call layer%read(unit, verbose=verbose_) | |
| 364 | |||
| 365 | 2 | end function read_maxpool2d_layer | |
| 366 | !############################################################################### | ||
| 367 | |||
| 368 | |||
| 369 | !############################################################################### | ||
| 370 | 1 | subroutine build_from_onnx_maxpool2d( & | |
| 371 |
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1 | this, node, initialisers, value_info, verbose & |
| 372 | ) | ||
| 373 | !! Read ONNX attributes for 2D max pooling layer | ||
| 374 | implicit none | ||
| 375 | |||
| 376 | ! Arguments | ||
| 377 | class(maxpool2d_layer_type), intent(inout) :: this | ||
| 378 | !! Instance of the 2D max pooling layer | ||
| 379 | type(onnx_node_type), intent(in) :: node | ||
| 380 | !! ONNX node information | ||
| 381 | type(onnx_initialiser_type), dimension(:), intent(in) :: initialisers | ||
| 382 | !! ONNX initialiser information | ||
| 383 | type(onnx_tensor_type), dimension(:), intent(in) :: value_info | ||
| 384 | !! ONNX value info | ||
| 385 | integer, intent(in) :: verbose | ||
| 386 | !! Verbosity level | ||
| 387 | |||
| 388 | ! Local variables | ||
| 389 | integer :: verbose_ = 0 | ||
| 390 | !! Verbosity level | ||
| 391 | integer :: i | ||
| 392 | !! Loop index and temporary integer | ||
| 393 | integer, dimension(2) :: stride, pool_size, padding | ||
| 394 | !! Stride, kernel size, and padding | ||
| 395 | character(256) :: val | ||
| 396 | !! Attribute value | ||
| 397 | character(20) :: padding_method | ||
| 398 | !! Padding method | ||
| 399 | |||
| 400 | ! Set default values | ||
| 401 | 1 | padding = 0 | |
| 402 | |||
| 403 |
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3 | do i = 1, size(node%attributes) |
| 404 |
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2 | val = node%attributes(i)%val |
| 405 |
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5 | select case(trim(adjustl(node%attributes(i)%name))) |
| 406 | case("kernel_shape") | ||
| 407 | 1 | read(val,*) pool_size | |
| 408 | case("strides") | ||
| 409 | 1 | read(val,*) stride | |
| 410 | case("pads") | ||
| 411 | ✗ | read(val,*) padding | |
| 412 | case default | ||
| 413 | ! Do nothing | ||
| 414 | ✗ | write(0,*) "WARNING: Unrecognised attribute in ONNX MAXPOOL2D ", & | |
| 415 |
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4 | "layer: ", trim(adjustl(node%attributes(i)%name)) |
| 416 | end select | ||
| 417 | end do | ||
| 418 | |||
| 419 | |||
| 420 | ! Check size of initialisers is zero | ||
| 421 |
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1 | if(size(initialisers).ne.0)then |
| 422 | ✗ | write(0,*) "WARNING: initialisers not used for ONNX MAXPOOL2D layer" | |
| 423 | end if | ||
| 424 | |||
| 425 | ! Convert integer padding to character method | ||
| 426 |
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3 | if(any(padding.gt.0))then |
| 427 | ✗ | padding_method = "constant" | |
| 428 | else | ||
| 429 | 1 | padding_method = "valid" | |
| 430 | end if | ||
| 431 | |||
| 432 | call this%set_hyperparams( & | ||
| 433 | stride = stride, & | ||
| 434 | pool_size = pool_size, & | ||
| 435 | padding = padding_method & | ||
| 436 | 1 | ) | |
| 437 | |||
| 438 | 1 | end subroutine build_from_onnx_maxpool2d | |
| 439 | !############################################################################### | ||
| 440 | |||
| 441 | |||
| 442 | !##############################################################################! | ||
| 443 | ! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ! | ||
| 444 | !##############################################################################! | ||
| 445 | |||
| 446 | |||
| 447 | !############################################################################### | ||
| 448 |
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3 | subroutine forward_maxpool2d(this, input) |
| 449 | !! Forward propagation | ||
| 450 | implicit none | ||
| 451 | |||
| 452 | ! Arguments | ||
| 453 | class(maxpool2d_layer_type), intent(inout) :: this | ||
| 454 | !! Instance of the 2D max pooling layer | ||
| 455 | class(array_type), dimension(:,:), intent(in) :: input | ||
| 456 | !! Input values | ||
| 457 | |||
| 458 | ! Local variables | ||
| 459 | type(array_type), pointer :: ptr | ||
| 460 | !! Pointer array | ||
| 461 | |||
| 462 | |||
| 463 |
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3 | call this%output(1,1)%zero_grad() |
| 464 | 3 | select case(allocated(this%pad_layer)) | |
| 465 | case(.true.) | ||
| 466 | ✗ | call this%pad_layer%forward(input) | |
| 467 | ✗ | ptr => maxpool2d(this%pad_layer%output(1,1), this%pool, this%strd) | |
| 468 | case default | ||
| 469 |
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3 | ptr => maxpool2d(input(1,1), this%pool, this%strd) |
| 470 | end select | ||
| 471 |
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3 | call this%output(1,1)%assign_and_deallocate_source(ptr) |
| 472 |
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3 | this%output(1,1)%is_temporary = .false. |
| 473 | |||
| 474 | 3 | end subroutine forward_maxpool2d | |
| 475 | !############################################################################### | ||
| 476 | |||
| 477 |
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148 | end module athena__maxpool2d_layer |
| 478 |