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configuration_maskformer.py
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configuration_maskformer.py
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# coding=utf-8
# Copyright 2022 Meta Platforms, Inc.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.
""" MaskFormer model configuration"""
from typing import Dict, Optional
from ...configuration_utils import PretrainedConfig
from ...utils import logging
from ..auto import CONFIG_MAPPING
from ..detr import DetrConfig
from ..swin import SwinConfig
MASKFORMER_PRETRAINED_CONFIG_ARCHIVE_MAP = {
"facebook/maskformer-swin-base-ade": (
"https://huggingface.co/facebook/maskformer-swin-base-ade/blob/main/config.json"
)
# See all MaskFormer models at https://huggingface.co/models?filter=maskformer
}
logger = logging.get_logger(__name__)
class MaskFormerConfig(PretrainedConfig):
r"""
This is the configuration class to store the configuration of a [`MaskFormerModel`]. It is used to instantiate a
MaskFormer model according to the specified arguments, defining the model architecture. Instantiating a
configuration with the defaults will yield a similar configuration to that of the MaskFormer
[facebook/maskformer-swin-base-ade](https://huggingface.co/facebook/maskformer-swin-base-ade) architecture trained
on [ADE20k-150](https://huggingface.co/datasets/scene_parse_150).
Configuration objects inherit from [`PretrainedConfig`] and can be used to control the model outputs. Read the
documentation from [`PretrainedConfig`] for more information.
Currently, MaskFormer only supports the [Swin Transformer](swin) as backbone.
Args:
mask_feature_size (`int`, *optional*, defaults to 256):
The masks' features size, this value will also be used to specify the Feature Pyramid Network features'
size.
no_object_weight (`float`, *optional*, defaults to 0.1):
Weight to apply to the null (no object) class.
use_auxiliary_loss(`bool`, *optional*, defaults to `False`):
If `True` [`MaskFormerForInstanceSegmentationOutput`] will contain the auxiliary losses computed using the
logits from each decoder's stage.
backbone_config (`Dict`, *optional*):
The configuration passed to the backbone, if unset, the configuration corresponding to
`swin-base-patch4-window12-384` will be used.
decoder_config (`Dict`, *optional*):
The configuration passed to the transformer decoder model, if unset the base config for `detr-resnet-50`
will be used.
init_std (`float`, *optional*, defaults to 0.02):
The standard deviation of the truncated_normal_initializer for initializing all weight matrices.
init_xavier_std (`float`, *optional*, defaults to 1):
The scaling factor used for the Xavier initialization gain in the HM Attention map module.
dice_weight (`float`, *optional*, defaults to 1.0):
The weight for the dice loss.
cross_entropy_weight (`float`, *optional*, defaults to 1.0):
The weight for the cross entropy loss.
mask_weight (`float`, *optional*, defaults to 20.0):
The weight for the mask loss.
output_auxiliary_logits (`bool`, *optional*):
Should the model output its `auxiliary_logits` or not.
Raises:
`ValueError`:
Raised if the backbone model type selected is not in `["swin"]` or the decoder model type selected is not
in `["detr"]`
Examples:
```python
>>> from transformers import MaskFormerConfig, MaskFormerModel
>>> # Initializing a MaskFormer facebook/maskformer-swin-base-ade configuration
>>> configuration = MaskFormerConfig()
>>> # Initializing a model (with random weights) from the facebook/maskformer-swin-base-ade style configuration
>>> model = MaskFormerModel(configuration)
>>> # Accessing the model configuration
>>> configuration = model.config
```
"""
model_type = "maskformer"
attribute_map = {"hidden_size": "mask_feature_size"}
backbones_supported = ["resnet", "swin"]
decoders_supported = ["detr"]
def __init__(
self,
fpn_feature_size: int = 256,
mask_feature_size: int = 256,
no_object_weight: float = 0.1,
use_auxiliary_loss: bool = False,
backbone_config: Optional[Dict] = None,
decoder_config: Optional[Dict] = None,
init_std: float = 0.02,
init_xavier_std: float = 1.0,
dice_weight: float = 1.0,
cross_entropy_weight: float = 1.0,
mask_weight: float = 20.0,
output_auxiliary_logits: Optional[bool] = None,
**kwargs,
):
if backbone_config is None:
# fall back to https://huggingface.co/microsoft/swin-base-patch4-window12-384-in22k
backbone_config = SwinConfig(
image_size=384,
in_channels=3,
patch_size=4,
embed_dim=128,
depths=[2, 2, 18, 2],
num_heads=[4, 8, 16, 32],
window_size=12,
drop_path_rate=0.3,
out_features=["stage1", "stage2", "stage3", "stage4"],
)
if isinstance(backbone_config, dict):
backbone_model_type = backbone_config.pop("model_type")
config_class = CONFIG_MAPPING[backbone_model_type]
backbone_config = config_class.from_dict(backbone_config)
# verify that the backbone is supported
if backbone_config.model_type not in self.backbones_supported:
logger.warning_once(
f"Backbone {backbone_config.model_type} is not a supported model and may not be compatible with MaskFormer. "
f"Supported model types: {','.join(self.backbones_supported)}"
)
if decoder_config is None:
# fall back to https://huggingface.co/facebook/detr-resnet-50
decoder_config = DetrConfig()
else:
# verify that the decoder is supported
decoder_type = (
decoder_config.pop("model_type") if isinstance(decoder_config, dict) else decoder_config.model_type
)
if decoder_type not in self.decoders_supported:
raise ValueError(
f"Transformer Decoder {decoder_type} not supported, please use one of"
f" {','.join(self.decoders_supported)}"
)
if isinstance(decoder_config, dict):
config_class = CONFIG_MAPPING[decoder_type]
decoder_config = config_class.from_dict(decoder_config)
self.backbone_config = backbone_config
self.decoder_config = decoder_config
# main feature dimension for the model
self.fpn_feature_size = fpn_feature_size
self.mask_feature_size = mask_feature_size
# initializer
self.init_std = init_std
self.init_xavier_std = init_xavier_std
# Hungarian matcher && loss
self.cross_entropy_weight = cross_entropy_weight
self.dice_weight = dice_weight
self.mask_weight = mask_weight
self.use_auxiliary_loss = use_auxiliary_loss
self.no_object_weight = no_object_weight
self.output_auxiliary_logits = output_auxiliary_logits
self.num_attention_heads = self.decoder_config.encoder_attention_heads
self.num_hidden_layers = self.decoder_config.num_hidden_layers
super().__init__(**kwargs)
@classmethod
def from_backbone_and_decoder_configs(
cls, backbone_config: PretrainedConfig, decoder_config: PretrainedConfig, **kwargs
):
"""Instantiate a [`MaskFormerConfig`] (or a derived class) from a pre-trained backbone model configuration and DETR model
configuration.
Args:
backbone_config ([`PretrainedConfig`]):
The backbone configuration.
decoder_config ([`PretrainedConfig`]):
The transformer decoder configuration to use.
Returns:
[`MaskFormerConfig`]: An instance of a configuration object
"""
return cls(
backbone_config=backbone_config,
decoder_config=decoder_config,
**kwargs,
)