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🚨🚨 Fix initialization of Mask2Former (#38864)

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* Correctly fix init

Co-authored-by: BUI Van Tuan <buivantuan07@gmail.com>

* add back the block, breaking BC but this is correct author's code

* override the test for params needing it

---------

Co-authored-by: BUI Van Tuan <buivantuan07@gmail.com>
This commit is contained in:
Cyril Vallez
2025-06-18 09:46:22 +02:00
committed by GitHub
parent 309e8c96f2
commit 5a95ed5ca0
4 changed files with 68 additions and 32 deletions
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20
src/transformers/models/mask2former/modeling_mask2former.py
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@@ -2127,30 +2127,20 @@ class Mask2FormerPreTrainedModel(PreTrainedModel):
for p in module.parameters():
if p.dim() > 1:
nn.init.xavier_uniform_(p, gain=xavier_std)
elif isinstance(module, Mask2FormerPixelLevelModule):
for submodule in module.modules():
if isinstance(submodule, (nn.Conv2d, nn.Linear)):
submodule.weight.data.normal_(mean=0.0, std=std)
if submodule.bias is not None:
submodule.bias.data.zero_()
module.cross_attn.in_proj_bias.data.zero_()
elif isinstance(module, Mask2FormerPixelDecoder):
for p in module.parameters():
if p.dim() > 1:
nn.init.xavier_uniform_(p)
nn.init.normal_(module.level_embed, std=0)
elif isinstance(module, Mask2FormerPixelDecoderEncoderOnly):
for p in module.parameters():
if p.dim() > 1:
nn.init.xavier_uniform_(p)
elif isinstance(module, (nn.Linear, nn.Conv2d, nn.BatchNorm2d)):
module.weight.data.normal_(mean=0.0, std=std)
if module.bias is not None:
module.bias.data.zero_()
elif isinstance(module, (nn.LayerNorm, nn.GroupNorm)):
module.weight.data.fill_(1.0)
module.bias.data.zero_()
elif isinstance(module, nn.Embedding):
module.weight.data.normal_(mean=0.0, std=std)
if module.padding_idx is not None:

7
src/transformers/utils/backbone_utils.py
View File

@@ -324,12 +324,7 @@ def load_backbone(config):
raise ValueError("Cannot specify both config.backbone_config and config.backbone")
# If any of thhe following are set, then the config passed in is from a model which contains a backbone.
if (
backbone_config is None
and use_timm_backbone is None
and backbone_checkpoint is None
and backbone_checkpoint is None
):
if backbone_config is None and use_timm_backbone is None and backbone_checkpoint is None:
return AutoBackbone.from_config(config=config, **backbone_kwargs)
# config from the parent model that has a backbone

17
tests/models/deformable_detr/test_modeling_deformable_detr.py
View File

@@ -590,15 +590,14 @@ class DeformableDetrModelTest(ModelTesterMixin, PipelineTesterMixin, unittest.Te
model = model_class(config=configs_no_init)
for name, param in model.named_parameters():
if param.requires_grad:
if param.requires_grad:
if (
"level_embed" in name
or "sampling_offsets.bias" in name
or "value_proj" in name
or "output_proj" in name
or "reference_points" in name
):
continue
if (
"level_embed" in name
or "sampling_offsets.bias" in name
or "value_proj" in name
or "output_proj" in name
or "reference_points" in name
):
continue
self.assertIn(
((param.data.mean() * 1e9).round() / 1e9).item(),
[0.0, 1.0],

56
tests/models/mask2former/test_modeling_mask2former.py
View File

@@ -18,7 +18,7 @@ import unittest
import numpy as np
from tests.test_modeling_common import floats_tensor
from transformers import Mask2FormerConfig, is_torch_available, is_vision_available
from transformers import AutoModelForImageClassification, Mask2FormerConfig, is_torch_available, is_vision_available
from transformers.pytorch_utils import is_torch_greater_or_equal_than_2_4
from transformers.testing_utils import (
require_timm,
@@ -33,7 +33,7 @@ from transformers.testing_utils import (
from transformers.utils import cached_property
from ...test_configuration_common import ConfigTester
from ...test_modeling_common import ModelTesterMixin
from ...test_modeling_common import ModelTesterMixin, _config_zero_init
from ...test_pipeline_mixin import PipelineTesterMixin
@@ -350,6 +350,58 @@ class Mask2FormerModelTest(ModelTesterMixin, PipelineTesterMixin, unittest.TestC
elif model.__class__.__name__ == "Mask2FormerForUniversalSegmentation":
self.assertEqual(model.model.pixel_level_module.encoder.out_indices, [1, 2, 3])
def test_initialization(self):
config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()
configs_no_init = _config_zero_init(config)
for model_class in self.all_model_classes:
model = model_class(config=configs_no_init)
for name, param in model.named_parameters():
if param.requires_grad:
if (
"self_attn.sampling_offsets.bias" in name
or "self_attn.value_proj.weight" in name
or "self_attn.output_proj.weight" in name
):
continue
self.assertIn(
((param.data.mean() * 1e9).round() / 1e9).item(),
[0.0, 1.0],
msg=f"Parameter {name} of model {model_class} seems not properly initialized",
)
def test_initialization_pretrained_backbone(self):
backbone_name = "microsoft/resnet-18"
# load Mask2Former config with a pretrained backbone
config = Mask2FormerConfig(
backbone=backbone_name,
use_pretrained_backbone=True,
)
# load pretrained backbone
backbone_model = AutoModelForImageClassification.from_pretrained(backbone_name, device_map=torch_device)
def params_match(params1, params2):
return all((p1 == p2).all() for p1, p2 in zip(params1, params2))
for model_class in self.all_model_classes:
model = model_class(config).to(torch_device).eval()
if model.__class__.__name__ == "Mask2FormerModel":
self.assertTrue(
params_match(
backbone_model.base_model.encoder.parameters(),
model.pixel_level_module.encoder.encoder.parameters(),
)
)
elif model.__class__.__name__ == "Mask2FormerForUniversalSegmentation":
self.assertTrue(
params_match(
backbone_model.base_model.encoder.parameters(),
model.model.pixel_level_module.encoder.encoder.parameters(),
)
)
TOLERANCE = 1e-4