| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | module athena__actv_layer | ||
| 2 | !! Module containing implementation of the activation layer | ||
| 3 | !! | ||
| 4 | !! This module wraps various activation functions into a layer type, | ||
| 5 | !! applying element-wise non-linear transformations to inputs. | ||
| 6 | !! | ||
| 7 | !! Mathematical operation: | ||
| 8 | !! y = σ(x) | ||
| 9 | !! | ||
| 10 | !! where σ is one of: relu, sigmoid, tanh, softmax, linear, etc. | ||
| 11 | !! | ||
| 12 | !! Properties: | ||
| 13 | !! - No learnable parameters (fixed non-linearity) | ||
| 14 | !! - Element-wise operation (preserves shape) | ||
| 15 | !! - Enables networks to learn non-linear functions | ||
| 16 | !! - Choice of activation affects gradient flow and convergence | ||
| 17 | use coreutils, only: real32, stop_program | ||
| 18 | use athena__base_layer, only: base_layer_type | ||
| 19 | use athena__misc_types, only: base_actv_type, & | ||
| 20 | onnx_node_type, onnx_initialiser_type, onnx_tensor_type | ||
| 21 | use diffstruc, only: array_type | ||
| 22 | implicit none | ||
| 23 | |||
| 24 | |||
| 25 | private | ||
| 26 | |||
| 27 | public :: actv_layer_type | ||
| 28 | public :: read_actv_layer, create_from_onnx_actv_layer | ||
| 29 | |||
| 30 | |||
| 31 | type, extends(base_layer_type) :: actv_layer_type | ||
| 32 | !! Layer type for activation layers | ||
| 33 | class(base_actv_type), allocatable :: activation | ||
| 34 | !! Activation function | ||
| 35 | contains | ||
| 36 | procedure, pass(this) :: set_rank => set_rank_actv | ||
| 37 | !! Set the input and output ranks of the layer | ||
| 38 | procedure, pass(this) :: set_hyperparams => set_hyperparams_actv | ||
| 39 | !! Set hyperparameters | ||
| 40 | procedure, pass(this) :: init => init_actv | ||
| 41 | !! Initialise layer | ||
| 42 | procedure, pass(this) :: print_to_unit => print_to_unit_actv | ||
| 43 | !! Print layer to unit | ||
| 44 | procedure, pass(this) :: read => read_actv | ||
| 45 | !! Read layer from file | ||
| 46 | procedure, pass(this) :: build_from_onnx => build_from_onnx_actv | ||
| 47 | !! Build activation layer from ONNX node and initialiser | ||
| 48 | |||
| 49 | procedure, pass(this) :: forward => forward_actv | ||
| 50 | !! Forward propagation derived type handler | ||
| 51 | |||
| 52 | end type actv_layer_type | ||
| 53 | |||
| 54 | |||
| 55 | interface actv_layer_type | ||
| 56 | !! Interface for the activation layer type | ||
| 57 | module function layer_setup( & | ||
| 58 | activation, & | ||
| 59 | input_shape, & | ||
| 60 | verbose & | ||
| 61 | ) result(layer) | ||
| 62 | !! Set up the activation layer | ||
| 63 | class(*), intent(in) :: activation | ||
| 64 | !! Activation function | ||
| 65 | integer, dimension(:), optional, intent(in) :: input_shape | ||
| 66 | !! Input shape | ||
| 67 | integer, optional, intent(in) :: verbose | ||
| 68 | !! Verbosity level | ||
| 69 | type(actv_layer_type) :: layer | ||
| 70 | !! Instance of the activation layer | ||
| 71 | end function layer_setup | ||
| 72 | end interface actv_layer_type | ||
| 73 | |||
| 74 | |||
| 75 | |||
| 76 | contains | ||
| 77 | |||
| 78 | !############################################################################### | ||
| 79 | 21 | module function layer_setup( & | |
| 80 | activation, & | ||
| 81 |
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21 | input_shape, & |
| 82 | verbose & | ||
| 83 | 21 | ) result(layer) | |
| 84 | !! Set up the activation layer | ||
| 85 | use athena__activation, only: activation_setup | ||
| 86 | implicit none | ||
| 87 | |||
| 88 | ! Arguments | ||
| 89 | class(*), intent(in) :: activation | ||
| 90 | !! Activation function | ||
| 91 | integer, dimension(:), optional, intent(in) :: input_shape | ||
| 92 | !! Input shape | ||
| 93 | integer, optional, intent(in) :: verbose | ||
| 94 | !! Verbosity level | ||
| 95 | type(actv_layer_type) :: layer | ||
| 96 | !! Instance of the activation layer | ||
| 97 | |||
| 98 | ! Local variables | ||
| 99 | 63 | class(base_actv_type), allocatable :: activation_ | |
| 100 | !! Activation function | ||
| 101 | integer :: verbose_ | ||
| 102 | !! Verbosity level | ||
| 103 | |||
| 104 | |||
| 105 | 21 | verbose_ = 0 | |
| 106 |
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21 | if(present(verbose)) verbose_ = verbose |
| 107 | |||
| 108 | !--------------------------------------------------------------------------- | ||
| 109 | ! Set activation function | ||
| 110 | !--------------------------------------------------------------------------- | ||
| 111 |
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21 | activation_ = activation_setup(activation) |
| 112 | |||
| 113 | |||
| 114 | !--------------------------------------------------------------------------- | ||
| 115 | ! set hyperparameters | ||
| 116 | !--------------------------------------------------------------------------- | ||
| 117 | call layer%set_hyperparams( & | ||
| 118 | activation = activation_, & | ||
| 119 | verbose = verbose_ & | ||
| 120 | 21 | ) | |
| 121 | |||
| 122 | |||
| 123 | !--------------------------------------------------------------------------- | ||
| 124 | ! initialise layer shape | ||
| 125 | !--------------------------------------------------------------------------- | ||
| 126 |
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21 | if(present(input_shape)) call layer%init( & |
| 127 | ✗ | input_shape=input_shape, & | |
| 128 | verbose=verbose_ & | ||
| 129 |
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17 | ) |
| 130 | |||
| 131 |
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42 | end function layer_setup |
| 132 | !############################################################################### | ||
| 133 | |||
| 134 | |||
| 135 | !############################################################################### | ||
| 136 | 23 | subroutine set_hyperparams_actv( & | |
| 137 | this, & | ||
| 138 | activation, & | ||
| 139 | input_rank, & | ||
| 140 | verbose & | ||
| 141 | ) | ||
| 142 | !! Set hyperparameters for activation layer | ||
| 143 | use athena__activation, only: activation_setup | ||
| 144 | use coreutils, only: to_lower | ||
| 145 | implicit none | ||
| 146 | |||
| 147 | ! Arguments | ||
| 148 | class(actv_layer_type), intent(inout) :: this | ||
| 149 | !! Instance of the activation layer | ||
| 150 | integer, optional, intent(in) :: input_rank | ||
| 151 | !! Input rank | ||
| 152 | class(base_actv_type), allocatable, intent(in) :: activation | ||
| 153 | !! Activation function | ||
| 154 | integer, optional, intent(in) :: verbose | ||
| 155 | !! Verbosity level | ||
| 156 | |||
| 157 | |||
| 158 |
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23 | this%name = "actv" |
| 159 | 23 | this%type = "actv" | |
| 160 | 23 | this%input_rank = 0 | |
| 161 |
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23 | if(present(input_rank)) this%input_rank = input_rank |
| 162 | 23 | this%output_rank = this%input_rank | |
| 163 |
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23 | if(.not.allocated(activation))then |
| 164 | ✗ | this%activation = activation_setup("none") | |
| 165 | else | ||
| 166 |
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23 | if(allocated(this%activation)) deallocate(this%activation) |
| 167 |
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23 | allocate(this%activation, source=activation) |
| 168 | end if | ||
| 169 |
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23 | this%subtype = trim(to_lower(this%activation%name)) |
| 170 | |||
| 171 |
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23 | if(present(verbose))then |
| 172 |
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22 | if(abs(verbose).gt.0)then |
| 173 | write(*,'("ACTV activation function: ",A)') & | ||
| 174 | ✗ | trim(this%activation%name) | |
| 175 | end if | ||
| 176 | end if | ||
| 177 | |||
| 178 | 23 | end subroutine set_hyperparams_actv | |
| 179 | !############################################################################### | ||
| 180 | |||
| 181 | |||
| 182 | !############################################################################### | ||
| 183 |
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21 | subroutine init_actv(this, input_shape, verbose) |
| 184 | !! Initialise activation layer | ||
| 185 | implicit none | ||
| 186 | |||
| 187 | ! Arguments | ||
| 188 | class(actv_layer_type), intent(inout) :: this | ||
| 189 | !! Instance of the activation layer | ||
| 190 | integer, dimension(:), intent(in) :: input_shape | ||
| 191 | !! Input shape | ||
| 192 | integer, optional, intent(in) :: verbose | ||
| 193 | !! Verbosity level | ||
| 194 | |||
| 195 | ! Local variables | ||
| 196 | integer :: verbose_ = 0 | ||
| 197 | !! Verbosity level | ||
| 198 | |||
| 199 | |||
| 200 | !--------------------------------------------------------------------------- | ||
| 201 | ! initialise optional arguments | ||
| 202 | !--------------------------------------------------------------------------- | ||
| 203 |
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21 | if(present(verbose)) verbose_ = verbose |
| 204 | |||
| 205 | |||
| 206 | !--------------------------------------------------------------------------- | ||
| 207 | ! initialise input shape | ||
| 208 | !--------------------------------------------------------------------------- | ||
| 209 |
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21 | this%input_rank = size(input_shape, dim=1) |
| 210 | 21 | this%output_rank = this%input_rank | |
| 211 |
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21 | if(.not.allocated(this%input_shape)) call this%set_shape(input_shape) |
| 212 |
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52 | this%output_shape = this%input_shape |
| 213 | |||
| 214 | |||
| 215 | !--------------------------------------------------------------------------- | ||
| 216 | ! Allocate arrays | ||
| 217 | !--------------------------------------------------------------------------- | ||
| 218 |
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21 | if(this%use_graph_input)then |
| 219 | call stop_program( & | ||
| 220 | "Graph input not supported for activation layer" & | ||
| 221 | ✗ | ) | |
| 222 | ✗ | return | |
| 223 | end if | ||
| 224 |
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21 | if(allocated(this%output)) deallocate(this%output) |
| 225 |
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63 | allocate(this%output(1,1)) |
| 226 | |||
| 227 | end subroutine init_actv | ||
| 228 | !############################################################################### | ||
| 229 | |||
| 230 | |||
| 231 | !############################################################################### | ||
| 232 | 6 | subroutine set_rank_actv(this, input_rank, output_rank) | |
| 233 | !! Set the input and output ranks of the activation layer | ||
| 234 | implicit none | ||
| 235 | |||
| 236 | ! Arguments | ||
| 237 | class(actv_layer_type), intent(inout) :: this | ||
| 238 | !! Instance of the activation layer | ||
| 239 | integer, intent(in) :: input_rank | ||
| 240 | !! Input rank | ||
| 241 | integer, intent(in) :: output_rank | ||
| 242 | !! Output rank | ||
| 243 | |||
| 244 | 6 | this%input_rank = input_rank | |
| 245 | 6 | this%output_rank = output_rank | |
| 246 |
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6 | if(this%input_rank.ne.this%output_rank)then |
| 247 | 2 | call stop_program("Warning: Activation layer input and output ranks differ") | |
| 248 | 2 | return | |
| 249 | end if | ||
| 250 |
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4 | if(this%input_rank.lt.1)then |
| 251 | ✗ | write(*,*) "Error: Activation layer input rank must be at least 1" | |
| 252 | ✗ | call stop_program("Invalid activation layer input rank") | |
| 253 | ✗ | return | |
| 254 | end if | ||
| 255 |
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4 | if(this%output_rank.lt.1)then |
| 256 | ✗ | write(*,*) "Error: Activation layer output rank must be at least 1" | |
| 257 | ✗ | call stop_program("Invalid activation layer output rank") | |
| 258 | ✗ | return | |
| 259 | end if | ||
| 260 | |||
| 261 | end subroutine set_rank_actv | ||
| 262 | !############################################################################### | ||
| 263 | |||
| 264 | |||
| 265 | !##############################################################################! | ||
| 266 | ! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ! | ||
| 267 | !##############################################################################! | ||
| 268 | |||
| 269 | |||
| 270 | !############################################################################### | ||
| 271 | 1 | subroutine print_to_unit_actv(this, unit) | |
| 272 | !! Print activation layer to unit | ||
| 273 | use coreutils, only: to_upper | ||
| 274 | implicit none | ||
| 275 | |||
| 276 | ! Arguments | ||
| 277 | class(actv_layer_type), intent(in) :: this | ||
| 278 | !! Instance of the activation layer | ||
| 279 | integer, intent(in) :: unit | ||
| 280 | !! File unit | ||
| 281 | |||
| 282 | |||
| 283 | ! Write initial parameters | ||
| 284 | !--------------------------------------------------------------------------- | ||
| 285 | 1 | write(unit,'(3X,"INPUT_SHAPE = ",3(1X,I0))') this%input_shape | |
| 286 |
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1 | if(this%activation%name .ne. 'none')then |
| 287 | 1 | call this%activation%print_to_unit(unit) | |
| 288 | end if | ||
| 289 | |||
| 290 | 1 | end subroutine print_to_unit_actv | |
| 291 | !############################################################################### | ||
| 292 | |||
| 293 | |||
| 294 | !############################################################################### | ||
| 295 | 1 | subroutine read_actv(this, unit, verbose) | |
| 296 | !! Read activation layer from file | ||
| 297 | use athena__tools_infile, only: assign_val, assign_vec | ||
| 298 | use coreutils, only: to_lower, to_upper | ||
| 299 | use athena__activation, only: read_activation | ||
| 300 | implicit none | ||
| 301 | |||
| 302 | ! Arguments | ||
| 303 | class(actv_layer_type), intent(inout) :: this | ||
| 304 | !! Instance of the activation layer | ||
| 305 | integer, intent(in) :: unit | ||
| 306 | !! File unit | ||
| 307 | integer, optional, intent(in) :: verbose | ||
| 308 | !! Verbosity level | ||
| 309 | |||
| 310 | ! Local variables | ||
| 311 | integer :: verbose_ = 0 | ||
| 312 | !! Verbosity level | ||
| 313 | integer :: stat | ||
| 314 | !! File status | ||
| 315 | integer :: itmp1, iline | ||
| 316 | !! Temporary integer and line counter | ||
| 317 | character(20) :: activation_name | ||
| 318 | !! Activation function name | ||
| 319 | 3 | class(base_actv_type), allocatable :: activation | |
| 320 | !! Activation function | ||
| 321 | integer, dimension(3) :: input_shape | ||
| 322 | !! Input shape | ||
| 323 | character(256) :: buffer, tag, err_msg | ||
| 324 | !! Buffer for reading lines, tag for identifying lines, error message | ||
| 325 | |||
| 326 | |||
| 327 | ! Initialise optional arguments | ||
| 328 | !--------------------------------------------------------------------------- | ||
| 329 |
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1 | if(present(verbose)) verbose_ = verbose |
| 330 | |||
| 331 | |||
| 332 | ! Loop over tags in layer card | ||
| 333 | !--------------------------------------------------------------------------- | ||
| 334 | 1 | iline = 0 | |
| 335 | 2 | tag_loop: do | |
| 336 | |||
| 337 | ! Check for end of file | ||
| 338 | !------------------------------------------------------------------------ | ||
| 339 | 3 | read(unit,'(A)',iostat=stat) buffer | |
| 340 |
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3 | if(stat.ne.0)then |
| 341 | write(err_msg,'("file encountered error (EoF?) before END ",A)') & | ||
| 342 | ✗ | to_upper(this%name) | |
| 343 | ✗ | call stop_program(err_msg) | |
| 344 | ✗ | return | |
| 345 | end if | ||
| 346 |
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3 | if(trim(adjustl(buffer)).eq."") cycle tag_loop |
| 347 | |||
| 348 | ! Check for end of layer card | ||
| 349 | !------------------------------------------------------------------------ | ||
| 350 |
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6 | if(trim(adjustl(buffer)).eq."END "//to_upper(trim(this%name)))then |
| 351 | 1 | backspace(unit) | |
| 352 | 3 | exit tag_loop | |
| 353 | end if | ||
| 354 | 2 | iline = iline + 1 | |
| 355 | |||
| 356 |
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2 | tag=trim(adjustl(buffer)) |
| 357 |
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2 | if(scan(buffer,"=").ne.0) tag=trim(tag(:scan(tag,"=")-1)) |
| 358 | |||
| 359 | ! Read parameters from save file | ||
| 360 | !------------------------------------------------------------------------ | ||
| 361 | 4 | select case(trim(tag)) | |
| 362 | case("INPUT_SHAPE") | ||
| 363 | 1 | call assign_vec(buffer, input_shape, itmp1) | |
| 364 | case("ACTIVATION") | ||
| 365 | 1 | iline = iline - 1 | |
| 366 | 1 | backspace(unit) | |
| 367 |
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1 | activation = read_activation(unit, iline) |
| 368 | case default | ||
| 369 | !! don't look for "e" due to scientific notation of numbers | ||
| 370 | !! ... i.e. exponent (E+00) | ||
| 371 | ✗ | if(scan(to_lower(trim(adjustl(buffer))),& | |
| 372 | 'abcdfghijklmnopqrstuvwxyz').eq.0)then | ||
| 373 | ✗ | cycle tag_loop | |
| 374 | ✗ | elseif(tag(:3).eq.'END')then | |
| 375 | ✗ | cycle tag_loop | |
| 376 | end if | ||
| 377 | write(err_msg,'("Unrecognised line in input file: ",A)') & | ||
| 378 | ✗ | trim(adjustl(buffer)) | |
| 379 | ✗ | call stop_program(err_msg) | |
| 380 |
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4 | return |
| 381 | end select | ||
| 382 | end do tag_loop | ||
| 383 | |||
| 384 | |||
| 385 | ! Set hyperparameters and initialise layer | ||
| 386 | !--------------------------------------------------------------------------- | ||
| 387 | call this%set_hyperparams( & | ||
| 388 | activation = activation & | ||
| 389 | 1 | ) | |
| 390 | 1 | call this%init(input_shape = input_shape) | |
| 391 | |||
| 392 | |||
| 393 | ! Check for end of layer card | ||
| 394 | !--------------------------------------------------------------------------- | ||
| 395 | 1 | read(unit,'(A)') buffer | |
| 396 |
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2 | if(trim(adjustl(buffer)).ne."END "//to_upper(trim(this%name)))then |
| 397 | ✗ | write(0,*) trim(adjustl(buffer)) | |
| 398 | ✗ | write(err_msg,'("END ",A," not where expected")') to_upper(this%name) | |
| 399 | ✗ | call stop_program(err_msg) | |
| 400 | 1 | return | |
| 401 | end if | ||
| 402 | |||
| 403 |
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1 | end subroutine read_actv |
| 404 | !############################################################################### | ||
| 405 | |||
| 406 | |||
| 407 | !############################################################################### | ||
| 408 | 1 | function read_actv_layer(unit, verbose) result(layer) | |
| 409 | !! Read activation layer from file | ||
| 410 | implicit none | ||
| 411 | |||
| 412 | ! Arguments | ||
| 413 | integer, intent(in) :: unit | ||
| 414 | !! File unit | ||
| 415 | integer, optional, intent(in) :: verbose | ||
| 416 | !! Verbosity level | ||
| 417 | class(base_layer_type), allocatable :: layer | ||
| 418 | !! Instance of the activation layer | ||
| 419 | |||
| 420 | ! Local variables | ||
| 421 | integer :: verbose_ = 0 | ||
| 422 | !! Verbosity level | ||
| 423 | |||
| 424 | |||
| 425 |
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1 | if(present(verbose)) verbose_ = verbose |
| 426 |
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2 | allocate(layer, source=actv_layer_type("none")) |
| 427 | 1 | call layer%read(unit, verbose=verbose_) | |
| 428 | |||
| 429 | 2 | end function read_actv_layer | |
| 430 | !############################################################################### | ||
| 431 | |||
| 432 | |||
| 433 | !############################################################################### | ||
| 434 | 3 | subroutine build_from_onnx_actv(this, node, initialisers, value_info, verbose ) | |
| 435 | !! Read ONNX attributes for activation layer | ||
| 436 | implicit none | ||
| 437 | |||
| 438 | ! Arguments | ||
| 439 | class(actv_layer_type), intent(inout) :: this | ||
| 440 | !! Instance of the activation layer | ||
| 441 | type(onnx_node_type), intent(in) :: node | ||
| 442 | !! ONNX node information | ||
| 443 | type(onnx_initialiser_type), dimension(:), intent(in) :: initialisers | ||
| 444 | !! ONNX initialiser information | ||
| 445 | type(onnx_tensor_type), dimension(:), intent(in) :: value_info | ||
| 446 | !! ONNX value info | ||
| 447 | integer, intent(in) :: verbose | ||
| 448 | !! Verbosity level | ||
| 449 | |||
| 450 | ! Local variables | ||
| 451 | integer :: verbose_ = 0 | ||
| 452 | !! Verbosity level | ||
| 453 | |||
| 454 | 3 | end subroutine build_from_onnx_actv | |
| 455 | !############################################################################### | ||
| 456 | |||
| 457 | |||
| 458 | !############################################################################### | ||
| 459 |
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3 | function create_from_onnx_actv_layer(node, initialisers, value_info, verbose) & |
| 460 | 3 | result(layer) | |
| 461 | !! Build activation layer from attributes and return layer | ||
| 462 | use athena__onnx_utils, only: onnx_to_athena_activation | ||
| 463 | implicit none | ||
| 464 | |||
| 465 | ! Arguments | ||
| 466 | type(onnx_node_type), intent(in) :: node | ||
| 467 | !! ONNX node information | ||
| 468 | type(onnx_initialiser_type), dimension(:), intent(in) :: initialisers | ||
| 469 | !! ONNX initialiser information | ||
| 470 | type(onnx_tensor_type), dimension(:), intent(in) :: value_info | ||
| 471 | !! ONNX value info | ||
| 472 | integer, optional, intent(in) :: verbose | ||
| 473 | !! Verbosity level | ||
| 474 | class(base_layer_type), allocatable :: layer | ||
| 475 | !! Instance of the activation layer | ||
| 476 | |||
| 477 | ! Local variables | ||
| 478 | integer :: verbose_ = 0 | ||
| 479 | !! Verbosity level | ||
| 480 | |||
| 481 |
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3 | if(present(verbose)) verbose_ = verbose |
| 482 | ✗ | allocate(layer, source=actv_layer_type( & | |
| 483 |
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9 | onnx_to_athena_activation(trim(node%op_type)))) |
| 484 |
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3 | call layer%build_from_onnx(node, initialisers, value_info, verbose=verbose_) |
| 485 | |||
| 486 | 9 | end function create_from_onnx_actv_layer | |
| 487 | !############################################################################### | ||
| 488 | |||
| 489 | |||
| 490 | !##############################################################################! | ||
| 491 | ! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ! | ||
| 492 | !##############################################################################! | ||
| 493 | |||
| 494 | |||
| 495 | !############################################################################### | ||
| 496 |
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19 | subroutine forward_actv(this, input) |
| 497 | !! Forward propagation | ||
| 498 | implicit none | ||
| 499 | |||
| 500 | ! Arguments | ||
| 501 | class(actv_layer_type), intent(inout) :: this | ||
| 502 | !! Instance of the fully connected layer | ||
| 503 | class(array_type), dimension(:,:), intent(in) :: input | ||
| 504 | !! Input values | ||
| 505 | |||
| 506 | ! Local variables | ||
| 507 | integer :: i, s | ||
| 508 | !! Loop indices | ||
| 509 | type(array_type), pointer :: ptr | ||
| 510 | !! Pointer array | ||
| 511 | |||
| 512 |
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38 | do s = 1, size(input, 2) |
| 513 |
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57 | do i = 1, size(input, 1) |
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19 | ptr => this%activation%apply(input(i,s)) |
| 515 |
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38 | call this%output(i,s)%assign_and_deallocate_source(ptr) |
| 516 | end do | ||
| 517 | end do | ||
| 518 | |||
| 519 | 19 | end subroutine forward_actv | |
| 520 | !############################################################################### | ||
| 521 | |||
| 522 |
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90 | end module athena__actv_layer |
| 523 |