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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
'''
@File : MaskFormerModel.py
@Time : 2022/09/30 20:50:53
@Author : BQH
@Version : 1.0
@Contact : raogx.vip@hotmail.com
@License : (C)Copyright 2017-2018, Liugroup-NLPR-CASIA
@Desc : 基于DeformTransAtten的分割网络
'''
# here put the import lib
from torch import nn
from addict import Dict
from .backbone.resnet import ResNet, resnet_spec
from .pixel_decoder.msdeformattn import MSDeformAttnPixelDecoder
from .transformer_decoder.mask2former_transformer_decoder import MultiScaleMaskedTransformerDecoder
class MaskFormerHead(nn.Module):
def __init__(self, cfg, input_shape):
super().__init__()
self.pixel_decoder = self.pixel_decoder_init(cfg, input_shape)
self.predictor = self.predictor_init(cfg)
def pixel_decoder_init(self, cfg, input_shape):
common_stride = cfg.MODEL.SEM_SEG_HEAD.COMMON_STRIDE
transformer_dropout = cfg.MODEL.MASK_FORMER.DROPOUT
transformer_nheads = cfg.MODEL.MASK_FORMER.NHEADS
transformer_dim_feedforward = 1024
transformer_enc_layers = cfg.MODEL.SEM_SEG_HEAD.TRANSFORMER_ENC_LAYERS
conv_dim = cfg.MODEL.SEM_SEG_HEAD.CONVS_DIM
mask_dim = cfg.MODEL.SEM_SEG_HEAD.MASK_DIM
transformer_in_features = cfg.MODEL.SEM_SEG_HEAD.DEFORMABLE_TRANSFORMER_ENCODER_IN_FEATURES # ["res3", "res4", "res5"]
pixel_decoder = MSDeformAttnPixelDecoder(input_shape,
transformer_dropout,
transformer_nheads,
transformer_dim_feedforward,
transformer_enc_layers,
conv_dim,
mask_dim,
transformer_in_features,
common_stride)
return pixel_decoder
def predictor_init(self, cfg):
in_channels = cfg.MODEL.SEM_SEG_HEAD.CONVS_DIM
num_classes = cfg.MODEL.SEM_SEG_HEAD.NUM_CLASSES
hidden_dim = cfg.MODEL.MASK_FORMER.HIDDEN_DIM
num_queries = cfg.MODEL.MASK_FORMER.NUM_OBJECT_QUERIES
nheads = cfg.MODEL.MASK_FORMER.NHEADS
dim_feedforward = cfg.MODEL.MASK_FORMER.DIM_FEEDFORWARD
dec_layers = cfg.MODEL.MASK_FORMER.DEC_LAYERS - 1
pre_norm = cfg.MODEL.MASK_FORMER.PRE_NORM
mask_dim = cfg.MODEL.SEM_SEG_HEAD.MASK_DIM
enforce_input_project = False
mask_classification = True
predictor = MultiScaleMaskedTransformerDecoder(in_channels,
num_classes,
mask_classification,
hidden_dim,
num_queries,
nheads,
dim_feedforward,
dec_layers,
pre_norm,
mask_dim,
enforce_input_project)
return predictor
def forward(self, features, mask=None):
mask_features, transformer_encoder_features, multi_scale_features = self.pixel_decoder.forward_features(features)
predictions = self.predictor(multi_scale_features, mask_features, mask)
return predictions, mask_features
class MaskFormerModel(nn.Module):
def __init__(self, cfg):
super().__init__()
self.backbone = self.build_backbone(cfg)
self.sem_seg_head = MaskFormerHead(cfg, self.backbone_feature_shape)
def build_backbone(self, cfg):
model_type = cfg.MODEL.BACKBONE.TYPE
assert model_type == 'resnet18' or model_type == 'resnet34' or model_type == 'resnet50', 'Do not support model type!'
channels = [64, 128, 256, 512]
if int(model_type[6:]) > 34:
channels = [item * 4 for item in channels]
backbone = ResNet(resnet_spec[model_type][0], resnet_spec[model_type][1])
# backbone.init_weights()
self.backbone_feature_shape = dict()
for i, channel in enumerate(channels):
self.backbone_feature_shape[f'res{i+2}'] = Dict({'channel': channel, 'stride': 2**(i+2)})
return backbone
def forward(self, inputs):
features = self.backbone(inputs)
outputs = self.sem_seg_head(features)
return outputs
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