-
Notifications
You must be signed in to change notification settings - Fork 25.5k
/
modeling_maskformer.py
1939 lines (1633 loc) 路 90.9 KB
/
modeling_maskformer.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
# coding=utf-8
# Copyright 2022 Meta Platforms, Inc.s and The HuggingFace Inc. team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
""" PyTorch MaskFormer model."""
import math
from dataclasses import dataclass
from numbers import Number
from typing import Dict, List, Optional, Tuple
import numpy as np
import torch
from torch import Tensor, nn
from ... import AutoBackbone
from ...activations import ACT2FN
from ...modeling_attn_mask_utils import _prepare_4d_attention_mask
from ...modeling_outputs import BaseModelOutputWithCrossAttentions
from ...modeling_utils import PreTrainedModel
from ...utils import (
ModelOutput,
add_start_docstrings,
add_start_docstrings_to_model_forward,
is_scipy_available,
logging,
replace_return_docstrings,
requires_backends,
)
from ..detr import DetrConfig
from .configuration_maskformer import MaskFormerConfig
from .configuration_maskformer_swin import MaskFormerSwinConfig
if is_scipy_available():
from scipy.optimize import linear_sum_assignment
logger = logging.get_logger(__name__)
_CONFIG_FOR_DOC = "MaskFormerConfig"
_CHECKPOINT_FOR_DOC = "facebook/maskformer-swin-base-ade"
MASKFORMER_PRETRAINED_MODEL_ARCHIVE_LIST = [
"facebook/maskformer-swin-base-ade",
# See all MaskFormer models at https://huggingface.co/models?filter=maskformer
]
@dataclass
# Copied from transformers.models.detr.modeling_detr.DetrDecoderOutput
class DetrDecoderOutput(BaseModelOutputWithCrossAttentions):
"""
Base class for outputs of the DETR decoder. This class adds one attribute to BaseModelOutputWithCrossAttentions,
namely an optional stack of intermediate decoder activations, i.e. the output of each decoder layer, each of them
gone through a layernorm. This is useful when training the model with auxiliary decoding losses.
Args:
last_hidden_state (`torch.FloatTensor` of shape `(batch_size, sequence_length, hidden_size)`):
Sequence of hidden-states at the output of the last layer of the model.
hidden_states (`tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
Tuple of `torch.FloatTensor` (one for the output of the embeddings + one for the output of each layer) of
shape `(batch_size, sequence_length, hidden_size)`. Hidden-states of the model at the output of each layer
plus the initial embedding outputs.
attentions (`tuple(torch.FloatTensor)`, *optional*, returned when `output_attentions=True` is passed or when `config.output_attentions=True`):
Tuple of `torch.FloatTensor` (one for each layer) of shape `(batch_size, num_heads, sequence_length,
sequence_length)`. Attentions weights after the attention softmax, used to compute the weighted average in
the self-attention heads.
cross_attentions (`tuple(torch.FloatTensor)`, *optional*, returned when `output_attentions=True` and `config.add_cross_attention=True` is passed or when `config.output_attentions=True`):
Tuple of `torch.FloatTensor` (one for each layer) of shape `(batch_size, num_heads, sequence_length,
sequence_length)`. Attentions weights of the decoder's cross-attention layer, after the attention softmax,
used to compute the weighted average in the cross-attention heads.
intermediate_hidden_states (`torch.FloatTensor` of shape `(config.decoder_layers, batch_size, num_queries, hidden_size)`, *optional*, returned when `config.auxiliary_loss=True`):
Intermediate decoder activations, i.e. the output of each decoder layer, each of them gone through a
layernorm.
"""
intermediate_hidden_states: Optional[torch.FloatTensor] = None
@dataclass
class MaskFormerPixelLevelModuleOutput(ModelOutput):
"""
MaskFormer's pixel level module output. It returns both the last and (optionally) the hidden states from the
`encoder` and `decoder`. By default, the `encoder` is a MaskFormerSwin Transformer and the `decoder` is a Feature
Pyramid Network (FPN).
The `encoder_last_hidden_state` are referred on the paper as **images features**, while `decoder_last_hidden_state`
as **pixel embeddings**
Args:
encoder_last_hidden_state (`torch.FloatTensor` of shape`(batch_size, num_channels, height, width)`):
Last hidden states (final feature map) of the last stage of the encoder.
encoder_hidden_states (`tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
Tuple of `torch.FloatTensor` (one for the output of the embeddings + one for the output of each stage) of
shape `(batch_size, num_channels, height, width)`. Hidden-states (also called feature maps) of the model at
the output of each stage.
decoder_last_hidden_state (`torch.FloatTensor` of shape`(batch_size, num_channels, height, width)`):
Last hidden states (final feature map) of the last stage of the decoder.
decoder_hidden_states (`tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
Tuple of `torch.FloatTensor` (one for the output of the embeddings + one for the output of each stage) of
shape `(batch_size, num_channels, height, width)`. Hidden-states (also called feature maps) of the model at
the output of each stage.
"""
encoder_last_hidden_state: Optional[torch.FloatTensor] = None
decoder_last_hidden_state: Optional[torch.FloatTensor] = None
encoder_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
decoder_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
@dataclass
class MaskFormerPixelDecoderOutput(ModelOutput):
"""
MaskFormer's pixel decoder module output, practically a Feature Pyramid Network. It returns the last hidden state
and (optionally) the hidden states.
Args:
last_hidden_state (`torch.FloatTensor` of shape `(batch_size, num_channels, height, width)`):
Last hidden states (final feature map) of the last stage of the model.
hidden_states (`tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
Tuple of `torch.FloatTensor` (one for the output of the embeddings + one for the output of each layer) of
shape `(batch_size, num_channels, height, width)`. Hidden-states of the model at the output of each layer
plus the initial embedding outputs.
attentions (`tuple(torch.FloatTensor)`, *optional*, returned when `output_attentions=True` is passed or when `config.output_attentions=True`):
Tuple of `torch.FloatTensor` (one for each layer) of shape `(batch_size, num_heads, sequence_length,
sequence_length)`. Attentions weights from Detr's decoder after the attention softmax, used to compute the
weighted average in the self-attention heads.
"""
last_hidden_state: torch.FloatTensor = None
hidden_states: Optional[Tuple[torch.FloatTensor]] = None
attentions: Optional[Tuple[torch.FloatTensor]] = None
@dataclass
class MaskFormerModelOutput(ModelOutput):
"""
Class for outputs of [`MaskFormerModel`]. This class returns all the needed hidden states to compute the logits.
Args:
encoder_last_hidden_state (`torch.FloatTensor` of shape `(batch_size, num_channels, height, width)`):
Last hidden states (final feature map) of the last stage of the encoder model (backbone).
pixel_decoder_last_hidden_state (`torch.FloatTensor` of shape `(batch_size, num_channels, height, width)`):
Last hidden states (final feature map) of the last stage of the pixel decoder model (FPN).
transformer_decoder_last_hidden_state (`torch.FloatTensor` of shape `(batch_size, sequence_length, hidden_size)`):
Last hidden states (final feature map) of the last stage of the transformer decoder model.
encoder_hidden_states (`tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
Tuple of `torch.FloatTensor` (one for the output of the embeddings + one for the output of each stage) of
shape `(batch_size, num_channels, height, width)`. Hidden-states (also called feature maps) of the encoder
model at the output of each stage.
pixel_decoder_hidden_states (`tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
Tuple of `torch.FloatTensor` (one for the output of the embeddings + one for the output of each stage) of
shape `(batch_size, num_channels, height, width)`. Hidden-states (also called feature maps) of the pixel
decoder model at the output of each stage.
transformer_decoder_hidden_states (`tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
Tuple of `torch.FloatTensor` (one for the output of the embeddings + one for the output of each stage) of
shape `(batch_size, sequence_length, hidden_size)`. Hidden-states (also called feature maps) of the
transformer decoder at the output of each stage.
hidden_states `tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
Tuple of `torch.FloatTensor` containing `encoder_hidden_states`, `pixel_decoder_hidden_states` and
`decoder_hidden_states`
attentions (`tuple(torch.FloatTensor)`, *optional*, returned when `output_attentions=True` is passed or when `config.output_attentions=True`):
Tuple of `torch.FloatTensor` (one for each layer) of shape `(batch_size, num_heads, sequence_length,
sequence_length)`. Attentions weights from Detr's decoder after the attention softmax, used to compute the
weighted average in the self-attention heads.
"""
encoder_last_hidden_state: Optional[torch.FloatTensor] = None
pixel_decoder_last_hidden_state: Optional[torch.FloatTensor] = None
transformer_decoder_last_hidden_state: Optional[torch.FloatTensor] = None
encoder_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
pixel_decoder_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
transformer_decoder_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
hidden_states: Optional[Tuple[torch.FloatTensor]] = None
attentions: Optional[Tuple[torch.FloatTensor]] = None
@dataclass
class MaskFormerForInstanceSegmentationOutput(ModelOutput):
"""
Class for outputs of [`MaskFormerForInstanceSegmentation`].
This output can be directly passed to [`~MaskFormerImageProcessor.post_process_semantic_segmentation`] or or
[`~MaskFormerImageProcessor.post_process_instance_segmentation`] or
[`~MaskFormerImageProcessor.post_process_panoptic_segmentation`] depending on the task. Please, see
[`~MaskFormerImageProcessor] for details regarding usage.
Args:
loss (`torch.Tensor`, *optional*):
The computed loss, returned when labels are present.
class_queries_logits (`torch.FloatTensor`):
A tensor of shape `(batch_size, num_queries, num_labels + 1)` representing the proposed classes for each
query. Note the `+ 1` is needed because we incorporate the null class.
masks_queries_logits (`torch.FloatTensor`):
A tensor of shape `(batch_size, num_queries, height, width)` representing the proposed masks for each
query.
encoder_last_hidden_state (`torch.FloatTensor` of shape `(batch_size, num_channels, height, width)`):
Last hidden states (final feature map) of the last stage of the encoder model (backbone).
pixel_decoder_last_hidden_state (`torch.FloatTensor` of shape `(batch_size, num_channels, height, width)`):
Last hidden states (final feature map) of the last stage of the pixel decoder model (FPN).
transformer_decoder_last_hidden_state (`torch.FloatTensor` of shape `(batch_size, sequence_length, hidden_size)`):
Last hidden states (final feature map) of the last stage of the transformer decoder model.
encoder_hidden_states (`tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
Tuple of `torch.FloatTensor` (one for the output of the embeddings + one for the output of each stage) of
shape `(batch_size, num_channels, height, width)`. Hidden-states (also called feature maps) of the encoder
model at the output of each stage.
pixel_decoder_hidden_states (`tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
Tuple of `torch.FloatTensor` (one for the output of the embeddings + one for the output of each stage) of
shape `(batch_size, num_channels, height, width)`. Hidden-states (also called feature maps) of the pixel
decoder model at the output of each stage.
transformer_decoder_hidden_states (`tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
Tuple of `torch.FloatTensor` (one for the output of the embeddings + one for the output of each stage) of
shape `(batch_size, sequence_length, hidden_size)`. Hidden-states of the transformer decoder at the output
of each stage.
hidden_states `tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
Tuple of `torch.FloatTensor` containing `encoder_hidden_states`, `pixel_decoder_hidden_states` and
`decoder_hidden_states`.
attentions (`tuple(torch.FloatTensor)`, *optional*, returned when `output_attentions=True` is passed or when `config.output_attentions=True`):
Tuple of `torch.FloatTensor` (one for each layer) of shape `(batch_size, num_heads, sequence_length,
sequence_length)`. Attentions weights from Detr's decoder after the attention softmax, used to compute the
weighted average in the self-attention heads.
"""
loss: Optional[torch.FloatTensor] = None
class_queries_logits: torch.FloatTensor = None
masks_queries_logits: torch.FloatTensor = None
auxiliary_logits: torch.FloatTensor = None
encoder_last_hidden_state: Optional[torch.FloatTensor] = None
pixel_decoder_last_hidden_state: Optional[torch.FloatTensor] = None
transformer_decoder_last_hidden_state: Optional[torch.FloatTensor] = None
encoder_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
pixel_decoder_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
transformer_decoder_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
hidden_states: Optional[Tuple[torch.FloatTensor]] = None
attentions: Optional[Tuple[torch.FloatTensor]] = None
def upsample_like(pixel_values: Tensor, like: Tensor, mode: str = "bilinear") -> Tensor:
"""
An utility function that upsamples `pixel_values` to match the dimension of `like`.
Args:
pixel_values (`torch.Tensor`):
The tensor we wish to upsample.
like (`torch.Tensor`):
The tensor we wish to use as size target.
mode (str, *optional*, defaults to `"bilinear"`):
The interpolation mode.
Returns:
`torch.Tensor`: The upsampled tensor
"""
_, _, height, width = like.shape
upsampled = nn.functional.interpolate(pixel_values, size=(height, width), mode=mode, align_corners=False)
return upsampled
# refactored from original implementation
def dice_loss(inputs: Tensor, labels: Tensor, num_masks: int) -> Tensor:
r"""
Compute the DICE loss, similar to generalized IOU for masks as follows:
$$ \mathcal{L}_{\text{dice}(x, y) = 1 - \frac{2 * x \cap y }{x \cup y + 1}} $$
In practice, since `labels` is a binary mask, (only 0s and 1s), dice can be computed as follow
$$ \mathcal{L}_{\text{dice}(x, y) = 1 - \frac{2 * x * y }{x + y + 1}} $$
Args:
inputs (`torch.Tensor`):
A tensor representing a mask.
labels (`torch.Tensor`):
A tensor with the same shape as inputs. Stores the binary classification labels for each element in inputs
(0 for the negative class and 1 for the positive class).
num_masks (`int`):
The number of masks present in the current batch, used for normalization.
Returns:
`torch.Tensor`: The computed loss.
"""
probs = inputs.sigmoid().flatten(1)
numerator = 2 * (probs * labels).sum(-1)
denominator = probs.sum(-1) + labels.sum(-1)
loss = 1 - (numerator + 1) / (denominator + 1)
loss = loss.sum() / num_masks
return loss
# refactored from original implementation
def sigmoid_focal_loss(
inputs: Tensor, labels: Tensor, num_masks: int, alpha: float = 0.25, gamma: float = 2
) -> Tensor:
r"""
Focal loss proposed in [Focal Loss for Dense Object Detection](https://arxiv.org/abs/1708.02002) originally used in
RetinaNet. The loss is computed as follows:
$$ \mathcal{L}_{\text{focal loss} = -(1 - p_t)^{\gamma}\log{(p_t)} $$
where \\(CE(p_t) = -\log{(p_t)}}\\), CE is the standard Cross Entropy Loss
Please refer to equation (1,2,3) of the paper for a better understanding.
Args:
inputs (`torch.Tensor`):
A float tensor of arbitrary shape.
labels (`torch.Tensor`):
A tensor with the same shape as inputs. Stores the binary classification labels for each element in inputs
(0 for the negative class and 1 for the positive class).
num_masks (`int`):
The number of masks present in the current batch, used for normalization.
alpha (float, *optional*, defaults to 0.25):
Weighting factor in range (0,1) to balance positive vs negative examples.
gamma (float, *optional*, defaults to 2.0):
Exponent of the modulating factor \\(1 - p_t\\) to balance easy vs hard examples.
Returns:
`torch.Tensor`: The computed loss.
"""
criterion = nn.BCEWithLogitsLoss(reduction="none")
probs = inputs.sigmoid()
cross_entropy_loss = criterion(inputs, labels)
p_t = probs * labels + (1 - probs) * (1 - labels)
loss = cross_entropy_loss * ((1 - p_t) ** gamma)
if alpha >= 0:
alpha_t = alpha * labels + (1 - alpha) * (1 - labels)
loss = alpha_t * loss
loss = loss.mean(1).sum() / num_masks
return loss
# refactored from original implementation
def pair_wise_dice_loss(inputs: Tensor, labels: Tensor) -> Tensor:
"""
A pair wise version of the dice loss, see `dice_loss` for usage.
Args:
inputs (`torch.Tensor`):
A tensor representing a mask
labels (`torch.Tensor`):
A tensor with the same shape as inputs. Stores the binary classification labels for each element in inputs
(0 for the negative class and 1 for the positive class).
Returns:
`torch.Tensor`: The computed loss between each pairs.
"""
inputs = inputs.sigmoid().flatten(1)
numerator = 2 * torch.matmul(inputs, labels.T)
# using broadcasting to get a [num_queries, NUM_CLASSES] matrix
denominator = inputs.sum(-1)[:, None] + labels.sum(-1)[None, :]
loss = 1 - (numerator + 1) / (denominator + 1)
return loss
# refactored from original implementation
def pair_wise_sigmoid_focal_loss(inputs: Tensor, labels: Tensor, alpha: float = 0.25, gamma: float = 2.0) -> Tensor:
r"""
A pair wise version of the focal loss, see `sigmoid_focal_loss` for usage.
Args:
inputs (`torch.Tensor`):
A tensor representing a mask.
labels (`torch.Tensor`):
A tensor with the same shape as inputs. Stores the binary classification labels for each element in inputs
(0 for the negative class and 1 for the positive class).
alpha (float, *optional*, defaults to 0.25):
Weighting factor in range (0,1) to balance positive vs negative examples.
gamma (float, *optional*, defaults to 2.0):
Exponent of the modulating factor \\(1 - p_t\\) to balance easy vs hard examples.
Returns:
`torch.Tensor`: The computed loss between each pairs.
"""
if alpha < 0:
raise ValueError("alpha must be positive")
height_and_width = inputs.shape[1]
criterion = nn.BCEWithLogitsLoss(reduction="none")
prob = inputs.sigmoid()
cross_entropy_loss_pos = criterion(inputs, torch.ones_like(inputs))
focal_pos = ((1 - prob) ** gamma) * cross_entropy_loss_pos
focal_pos *= alpha
cross_entropy_loss_neg = criterion(inputs, torch.zeros_like(inputs))
focal_neg = (prob**gamma) * cross_entropy_loss_neg
focal_neg *= 1 - alpha
loss = torch.matmul(focal_pos, labels.T) + torch.matmul(focal_neg, (1 - labels).T)
return loss / height_and_width
# Copied from transformers.models.detr.modeling_detr.DetrAttention
class DetrAttention(nn.Module):
"""
Multi-headed attention from 'Attention Is All You Need' paper.
Here, we add position embeddings to the queries and keys (as explained in the DETR paper).
"""
def __init__(
self,
embed_dim: int,
num_heads: int,
dropout: float = 0.0,
bias: bool = True,
):
super().__init__()
self.embed_dim = embed_dim
self.num_heads = num_heads
self.dropout = dropout
self.head_dim = embed_dim // num_heads
if self.head_dim * num_heads != self.embed_dim:
raise ValueError(
f"embed_dim must be divisible by num_heads (got `embed_dim`: {self.embed_dim} and `num_heads`:"
f" {num_heads})."
)
self.scaling = self.head_dim**-0.5
self.k_proj = nn.Linear(embed_dim, embed_dim, bias=bias)
self.v_proj = nn.Linear(embed_dim, embed_dim, bias=bias)
self.q_proj = nn.Linear(embed_dim, embed_dim, bias=bias)
self.out_proj = nn.Linear(embed_dim, embed_dim, bias=bias)
def _shape(self, tensor: torch.Tensor, seq_len: int, batch_size: int):
return tensor.view(batch_size, seq_len, self.num_heads, self.head_dim).transpose(1, 2).contiguous()
def with_pos_embed(self, tensor: torch.Tensor, object_queries: Optional[Tensor], **kwargs):
position_embeddings = kwargs.pop("position_embeddings", None)
if kwargs:
raise ValueError(f"Unexpected arguments {kwargs.keys()}")
if position_embeddings is not None and object_queries is not None:
raise ValueError(
"Cannot specify both position_embeddings and object_queries. Please use just object_queries"
)
if position_embeddings is not None:
logger.warning_once(
"position_embeddings has been deprecated and will be removed in v4.34. Please use object_queries instead"
)
object_queries = position_embeddings
return tensor if object_queries is None else tensor + object_queries
def forward(
self,
hidden_states: torch.Tensor,
attention_mask: Optional[torch.Tensor] = None,
object_queries: Optional[torch.Tensor] = None,
key_value_states: Optional[torch.Tensor] = None,
spatial_position_embeddings: Optional[torch.Tensor] = None,
output_attentions: bool = False,
**kwargs,
) -> Tuple[torch.Tensor, Optional[torch.Tensor], Optional[Tuple[torch.Tensor]]]:
"""Input shape: Batch x Time x Channel"""
position_embeddings = kwargs.pop("position_ebmeddings", None)
key_value_position_embeddings = kwargs.pop("key_value_position_embeddings", None)
if kwargs:
raise ValueError(f"Unexpected arguments {kwargs.keys()}")
if position_embeddings is not None and object_queries is not None:
raise ValueError(
"Cannot specify both position_embeddings and object_queries. Please use just object_queries"
)
if key_value_position_embeddings is not None and spatial_position_embeddings is not None:
raise ValueError(
"Cannot specify both key_value_position_embeddings and spatial_position_embeddings. Please use just spatial_position_embeddings"
)
if position_embeddings is not None:
logger.warning_once(
"position_embeddings has been deprecated and will be removed in v4.34. Please use object_queries instead"
)
object_queries = position_embeddings
if key_value_position_embeddings is not None:
logger.warning_once(
"key_value_position_embeddings has been deprecated and will be removed in v4.34. Please use spatial_position_embeddings instead"
)
spatial_position_embeddings = key_value_position_embeddings
# if key_value_states are provided this layer is used as a cross-attention layer
# for the decoder
is_cross_attention = key_value_states is not None
batch_size, target_len, embed_dim = hidden_states.size()
# add position embeddings to the hidden states before projecting to queries and keys
if object_queries is not None:
hidden_states_original = hidden_states
hidden_states = self.with_pos_embed(hidden_states, object_queries)
# add key-value position embeddings to the key value states
if spatial_position_embeddings is not None:
key_value_states_original = key_value_states
key_value_states = self.with_pos_embed(key_value_states, spatial_position_embeddings)
# get query proj
query_states = self.q_proj(hidden_states) * self.scaling
# get key, value proj
if is_cross_attention:
# cross_attentions
key_states = self._shape(self.k_proj(key_value_states), -1, batch_size)
value_states = self._shape(self.v_proj(key_value_states_original), -1, batch_size)
else:
# self_attention
key_states = self._shape(self.k_proj(hidden_states), -1, batch_size)
value_states = self._shape(self.v_proj(hidden_states_original), -1, batch_size)
proj_shape = (batch_size * self.num_heads, -1, self.head_dim)
query_states = self._shape(query_states, target_len, batch_size).view(*proj_shape)
key_states = key_states.view(*proj_shape)
value_states = value_states.view(*proj_shape)
source_len = key_states.size(1)
attn_weights = torch.bmm(query_states, key_states.transpose(1, 2))
if attn_weights.size() != (batch_size * self.num_heads, target_len, source_len):
raise ValueError(
f"Attention weights should be of size {(batch_size * self.num_heads, target_len, source_len)}, but is"
f" {attn_weights.size()}"
)
if attention_mask is not None:
if attention_mask.size() != (batch_size, 1, target_len, source_len):
raise ValueError(
f"Attention mask should be of size {(batch_size, 1, target_len, source_len)}, but is"
f" {attention_mask.size()}"
)
attn_weights = attn_weights.view(batch_size, self.num_heads, target_len, source_len) + attention_mask
attn_weights = attn_weights.view(batch_size * self.num_heads, target_len, source_len)
attn_weights = nn.functional.softmax(attn_weights, dim=-1)
if output_attentions:
# this operation is a bit awkward, but it's required to
# make sure that attn_weights keeps its gradient.
# In order to do so, attn_weights have to reshaped
# twice and have to be reused in the following
attn_weights_reshaped = attn_weights.view(batch_size, self.num_heads, target_len, source_len)
attn_weights = attn_weights_reshaped.view(batch_size * self.num_heads, target_len, source_len)
else:
attn_weights_reshaped = None
attn_probs = nn.functional.dropout(attn_weights, p=self.dropout, training=self.training)
attn_output = torch.bmm(attn_probs, value_states)
if attn_output.size() != (batch_size * self.num_heads, target_len, self.head_dim):
raise ValueError(
f"`attn_output` should be of size {(batch_size, self.num_heads, target_len, self.head_dim)}, but is"
f" {attn_output.size()}"
)
attn_output = attn_output.view(batch_size, self.num_heads, target_len, self.head_dim)
attn_output = attn_output.transpose(1, 2)
attn_output = attn_output.reshape(batch_size, target_len, embed_dim)
attn_output = self.out_proj(attn_output)
return attn_output, attn_weights_reshaped
# Copied from transformers.models.detr.modeling_detr.DetrDecoderLayer
class DetrDecoderLayer(nn.Module):
def __init__(self, config: DetrConfig):
super().__init__()
self.embed_dim = config.d_model
self.self_attn = DetrAttention(
embed_dim=self.embed_dim,
num_heads=config.decoder_attention_heads,
dropout=config.attention_dropout,
)
self.dropout = config.dropout
self.activation_fn = ACT2FN[config.activation_function]
self.activation_dropout = config.activation_dropout
self.self_attn_layer_norm = nn.LayerNorm(self.embed_dim)
self.encoder_attn = DetrAttention(
self.embed_dim,
config.decoder_attention_heads,
dropout=config.attention_dropout,
)
self.encoder_attn_layer_norm = nn.LayerNorm(self.embed_dim)
self.fc1 = nn.Linear(self.embed_dim, config.decoder_ffn_dim)
self.fc2 = nn.Linear(config.decoder_ffn_dim, self.embed_dim)
self.final_layer_norm = nn.LayerNorm(self.embed_dim)
def forward(
self,
hidden_states: torch.Tensor,
attention_mask: Optional[torch.Tensor] = None,
object_queries: Optional[torch.Tensor] = None,
query_position_embeddings: Optional[torch.Tensor] = None,
encoder_hidden_states: Optional[torch.Tensor] = None,
encoder_attention_mask: Optional[torch.Tensor] = None,
output_attentions: Optional[bool] = False,
**kwargs,
):
"""
Args:
hidden_states (`torch.FloatTensor`): input to the layer of shape `(batch, seq_len, embed_dim)`
attention_mask (`torch.FloatTensor`): attention mask of size
`(batch, 1, target_len, source_len)` where padding elements are indicated by very large negative
values.
object_queries (`torch.FloatTensor`, *optional*):
object_queries that are added to the hidden states
in the cross-attention layer.
query_position_embeddings (`torch.FloatTensor`, *optional*):
position embeddings that are added to the queries and keys
in the self-attention layer.
encoder_hidden_states (`torch.FloatTensor`):
cross attention input to the layer of shape `(batch, seq_len, embed_dim)`
encoder_attention_mask (`torch.FloatTensor`): encoder attention mask of size
`(batch, 1, target_len, source_len)` where padding elements are indicated by very large negative
values.
output_attentions (`bool`, *optional*):
Whether or not to return the attentions tensors of all attention layers. See `attentions` under
returned tensors for more detail.
"""
position_embeddings = kwargs.pop("position_embeddings", None)
if kwargs:
raise ValueError(f"Unexpected arguments {kwargs.keys()}")
if position_embeddings is not None and object_queries is not None:
raise ValueError(
"Cannot specify both position_embeddings and object_queries. Please use just object_queries"
)
if position_embeddings is not None:
logger.warning_once(
"position_embeddings has been deprecated and will be removed in v4.34. Please use object_queries instead"
)
object_queries = position_embeddings
residual = hidden_states
# Self Attention
hidden_states, self_attn_weights = self.self_attn(
hidden_states=hidden_states,
object_queries=query_position_embeddings,
attention_mask=attention_mask,
output_attentions=output_attentions,
)
hidden_states = nn.functional.dropout(hidden_states, p=self.dropout, training=self.training)
hidden_states = residual + hidden_states
hidden_states = self.self_attn_layer_norm(hidden_states)
# Cross-Attention Block
cross_attn_weights = None
if encoder_hidden_states is not None:
residual = hidden_states
hidden_states, cross_attn_weights = self.encoder_attn(
hidden_states=hidden_states,
object_queries=query_position_embeddings,
key_value_states=encoder_hidden_states,
attention_mask=encoder_attention_mask,
spatial_position_embeddings=object_queries,
output_attentions=output_attentions,
)
hidden_states = nn.functional.dropout(hidden_states, p=self.dropout, training=self.training)
hidden_states = residual + hidden_states
hidden_states = self.encoder_attn_layer_norm(hidden_states)
# Fully Connected
residual = hidden_states
hidden_states = self.activation_fn(self.fc1(hidden_states))
hidden_states = nn.functional.dropout(hidden_states, p=self.activation_dropout, training=self.training)
hidden_states = self.fc2(hidden_states)
hidden_states = nn.functional.dropout(hidden_states, p=self.dropout, training=self.training)
hidden_states = residual + hidden_states
hidden_states = self.final_layer_norm(hidden_states)
outputs = (hidden_states,)
if output_attentions:
outputs += (self_attn_weights, cross_attn_weights)
return outputs
class DetrDecoder(nn.Module):
"""
Transformer decoder consisting of *config.decoder_layers* layers. Each layer is a [`DetrDecoderLayer`].
The decoder updates the query embeddings through multiple self-attention and cross-attention layers.
Some small tweaks for DETR:
- object_queries and query_position_embeddings are added to the forward pass.
- if self.config.auxiliary_loss is set to True, also returns a stack of activations from all decoding layers.
Args:
config: DetrConfig
"""
def __init__(self, config: DetrConfig):
super().__init__()
self.config = config
self.dropout = config.dropout
self.layerdrop = config.decoder_layerdrop
self.layers = nn.ModuleList([DetrDecoderLayer(config) for _ in range(config.decoder_layers)])
# in DETR, the decoder uses layernorm after the last decoder layer output
self.layernorm = nn.LayerNorm(config.d_model)
self.gradient_checkpointing = False
def forward(
self,
inputs_embeds=None,
attention_mask=None,
encoder_hidden_states=None,
encoder_attention_mask=None,
object_queries=None,
query_position_embeddings=None,
output_attentions=None,
output_hidden_states=None,
return_dict=None,
**kwargs,
):
r"""
Args:
inputs_embeds (`torch.FloatTensor` of shape `(batch_size, sequence_length, hidden_size)`):
The query embeddings that are passed into the decoder.
attention_mask (`torch.Tensor` of shape `(batch_size, sequence_length)`, *optional*):
Mask to avoid performing attention on certain queries. Mask values selected in `[0, 1]`:
- 1 for queries that are **not masked**,
- 0 for queries that are **masked**.
[What are attention masks?](../glossary#attention-mask)
encoder_hidden_states (`torch.FloatTensor` of shape `(batch_size, encoder_sequence_length, hidden_size)`, *optional*):
Sequence of hidden-states at the output of the last layer of the encoder. Used in the cross-attention
of the decoder.
encoder_attention_mask (`torch.LongTensor` of shape `(batch_size, encoder_sequence_length)`, *optional*):
Mask to avoid performing cross-attention on padding pixel_values of the encoder. Mask values selected
in `[0, 1]`:
- 1 for pixels that are real (i.e. **not masked**),
- 0 for pixels that are padding (i.e. **masked**).
object_queries (`torch.FloatTensor` of shape `(batch_size, sequence_length, hidden_size)`, *optional*):
Position embeddings that are added to the queries and keys in each cross-attention layer.
query_position_embeddings (`torch.FloatTensor` of shape `(batch_size, num_queries, hidden_size)`):
, *optional*): Position embeddings that are added to the queries and keys in each self-attention layer.
output_attentions (`bool`, *optional*):
Whether or not to return the attentions tensors of all attention layers. See `attentions` under
returned tensors for more detail.
output_hidden_states (`bool`, *optional*):
Whether or not to return the hidden states of all layers. See `hidden_states` under returned tensors
for more detail.
return_dict (`bool`, *optional*):
Whether or not to return a [`~utils.ModelOutput`] instead of a plain tuple.
"""
position_embeddings = kwargs.pop("position_embeddings", None)
if kwargs:
raise ValueError(f"Unexpected arguments {kwargs.keys()}")
if position_embeddings is not None and object_queries is not None:
raise ValueError(
"Cannot specify both position_embeddings and object_queries. Please use just object_queries"
)
if position_embeddings is not None:
logger.warning_once(
"position_embeddings has been deprecated and will be removed in v4.34. Please use object_queries instead"
)
object_queries = position_embeddings
output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
output_hidden_states = (
output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states
)
return_dict = return_dict if return_dict is not None else self.config.use_return_dict
if inputs_embeds is not None:
hidden_states = inputs_embeds
input_shape = inputs_embeds.size()[:-1]
# expand encoder attention mask
if encoder_hidden_states is not None and encoder_attention_mask is not None:
# [bsz, seq_len] -> [bsz, 1, tgt_seq_len, src_seq_len]
encoder_attention_mask = _prepare_4d_attention_mask(
encoder_attention_mask, inputs_embeds.dtype, tgt_len=input_shape[-1]
)
# optional intermediate hidden states
intermediate = () if self.config.auxiliary_loss else None
# decoder layers
all_hidden_states = () if output_hidden_states else None
all_self_attns = () if output_attentions else None
all_cross_attentions = () if (output_attentions and encoder_hidden_states is not None) else None
for idx, decoder_layer in enumerate(self.layers):
# add LayerDrop (see https://arxiv.org/abs/1909.11556 for description)
if output_hidden_states:
all_hidden_states += (hidden_states,)
if self.training:
dropout_probability = torch.rand([])
if dropout_probability < self.layerdrop:
continue
if self.gradient_checkpointing and self.training:
layer_outputs = self._gradient_checkpointing_func(
decoder_layer.__call__,
hidden_states,
None,
encoder_hidden_states,
encoder_attention_mask,
None,
output_attentions,
)
else:
layer_outputs = decoder_layer(
hidden_states,
attention_mask=None,
object_queries=object_queries,
query_position_embeddings=query_position_embeddings,
encoder_hidden_states=encoder_hidden_states,
encoder_attention_mask=encoder_attention_mask,
output_attentions=output_attentions,
)
hidden_states = layer_outputs[0]
if self.config.auxiliary_loss:
hidden_states = self.layernorm(hidden_states)
intermediate += (hidden_states,)
if output_attentions:
all_self_attns += (layer_outputs[1],)
if encoder_hidden_states is not None:
all_cross_attentions += (layer_outputs[2],)
# finally, apply layernorm
hidden_states = self.layernorm(hidden_states)
# add hidden states from the last decoder layer
if output_hidden_states:
all_hidden_states += (hidden_states,)
# stack intermediate decoder activations
if self.config.auxiliary_loss:
intermediate = torch.stack(intermediate)
if not return_dict:
return tuple(
v
for v in [hidden_states, all_hidden_states, all_self_attns, all_cross_attentions, intermediate]
if v is not None
)
return DetrDecoderOutput(
last_hidden_state=hidden_states,
hidden_states=all_hidden_states,
attentions=all_self_attns,
cross_attentions=all_cross_attentions,
intermediate_hidden_states=intermediate,
)
# refactored from original implementation
class MaskFormerHungarianMatcher(nn.Module):
"""This class computes an assignment between the labels and the predictions of the network.
For efficiency reasons, the labels don't include the no_object. Because of this, in general, there are more
predictions than labels. In this case, we do a 1-to-1 matching of the best predictions, while the others are
un-matched (and thus treated as non-objects).
"""
def __init__(self, cost_class: float = 1.0, cost_mask: float = 1.0, cost_dice: float = 1.0):
"""Creates the matcher
Params:
cost_class (float, *optional*, defaults to 1.0):
This is the relative weight of the classification error in the matching cost.
cost_mask (float, *optional*, defaults to 1.0):
This is the relative weight of the focal loss of the binary mask in the matching cost.
cost_dice (float, *optional*, defaults to 1.0):
This is the relative weight of the dice loss of the binary mask in the matching cost
"""
super().__init__()
if cost_class == 0 and cost_mask == 0 and cost_dice == 0:
raise ValueError("All costs cant be 0")
self.cost_class = cost_class
self.cost_mask = cost_mask
self.cost_dice = cost_dice
@torch.no_grad()
def forward(self, masks_queries_logits, class_queries_logits, mask_labels, class_labels) -> List[Tuple[Tensor]]:
"""Performs the matching
Params:
masks_queries_logits (`torch.Tensor`):
A tensor` of dim `batch_size, num_queries, num_labels` with the
classification logits.
class_queries_logits (`torch.Tensor`):
A tensor` of dim `batch_size, num_queries, height, width` with the
predicted masks.
class_labels (`torch.Tensor`):
A tensor` of dim `num_target_boxes` (where num_target_boxes is the number
of ground-truth objects in the target) containing the class labels.
mask_labels (`torch.Tensor`):
A tensor` of dim `num_target_boxes, height, width` containing the target
masks.
Returns:
`List[Tuple[Tensor]]`: A list of size batch_size, containing tuples of (index_i, index_j) where:
- index_i is the indices of the selected predictions (in order)
- index_j is the indices of the corresponding selected labels (in order)
For each batch element, it holds:
len(index_i) = len(index_j) = min(num_queries, num_target_boxes).
"""
indices: List[Tuple[np.array]] = []
preds_masks = masks_queries_logits
preds_probs = class_queries_logits
# iterate through batch size
for pred_probs, pred_mask, target_mask, labels in zip(preds_probs, preds_masks, mask_labels, class_labels):
# downsample the target mask, save memory
target_mask = nn.functional.interpolate(target_mask[:, None], size=pred_mask.shape[-2:], mode="nearest")
pred_probs = pred_probs.softmax(-1)
# Compute the classification cost. Contrary to the loss, we don't use the NLL,
# but approximate it in 1 - proba[target class].
# The 1 is a constant that doesn't change the matching, it can be ommitted.
cost_class = -pred_probs[:, labels]
# flatten spatial dimension "q h w -> q (h w)"
pred_mask_flat = pred_mask.flatten(1) # [num_queries, height*width]
# same for target_mask "c h w -> c (h w)"
target_mask_flat = target_mask[:, 0].flatten(1) # [num_total_labels, height*width]
# compute the focal loss between each mask pairs -> shape (num_queries, num_labels)
cost_mask = pair_wise_sigmoid_focal_loss(pred_mask_flat, target_mask_flat)
# Compute the dice loss betwen each mask pairs -> shape (num_queries, num_labels)
cost_dice = pair_wise_dice_loss(pred_mask_flat, target_mask_flat)
# final cost matrix
cost_matrix = self.cost_mask * cost_mask + self.cost_class * cost_class + self.cost_dice * cost_dice
# do the assigmented using the hungarian algorithm in scipy
assigned_indices: Tuple[np.array] = linear_sum_assignment(cost_matrix.cpu())
indices.append(assigned_indices)
# It could be stacked in one tensor
matched_indices = [
(torch.as_tensor(i, dtype=torch.int64), torch.as_tensor(j, dtype=torch.int64)) for i, j in indices
]
return matched_indices
def __repr__(self):
head = "Matcher " + self.__class__.__name__
body = [
f"cost_class: {self.cost_class}",
f"cost_mask: {self.cost_mask}",
f"cost_dice: {self.cost_dice}",
]
_repr_indent = 4
lines = [head] + [" " * _repr_indent + line for line in body]
return "\n".join(lines)
# copied and adapted from original implementation
class MaskFormerLoss(nn.Module):
def __init__(
self,
num_labels: int,
matcher: MaskFormerHungarianMatcher,
weight_dict: Dict[str, float],
eos_coef: float,
):
"""
The MaskFormer Loss. The loss is computed very similar to DETR. The process happens in two steps: 1) we compute
hungarian assignment between ground truth masks and the outputs of the model 2) we supervise each pair of
matched ground-truth / prediction (supervise class and mask)