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PaddleRS/paddlers/models/ppdet/modeling/heads/pico_head.py

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# Copyright (c) 2022 PaddlePaddle Authors. 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.
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import math
import numpy as np
import paddle
import paddle.nn as nn
import paddle.nn.functional as F
from paddle import ParamAttr
from paddle.nn.initializer import Normal, Constant
from paddlers.models.ppdet.core.workspace import register
from paddlers.models.ppdet.modeling.layers import ConvNormLayer
from .simota_head import OTAVFLHead
@register
class PicoFeat(nn.Layer):
"""
PicoFeat of PicoDet
Args:
feat_in (int): The channel number of input Tensor.
feat_out (int): The channel number of output Tensor.
num_convs (int): The convolution number of the LiteGFLFeat.
norm_type (str): Normalization type, 'bn'/'sync_bn'/'gn'.
"""
def __init__(self,
feat_in=256,
feat_out=96,
num_fpn_stride=3,
num_convs=2,
norm_type='bn',
share_cls_reg=False,
act='hard_swish'):
super(PicoFeat, self).__init__()
self.num_convs = num_convs
self.norm_type = norm_type
self.share_cls_reg = share_cls_reg
self.act = act
self.cls_convs = []
self.reg_convs = []
for stage_idx in range(num_fpn_stride):
cls_subnet_convs = []
reg_subnet_convs = []
for i in range(self.num_convs):
in_c = feat_in if i == 0 else feat_out
cls_conv_dw = self.add_sublayer(
'cls_conv_dw{}.{}'.format(stage_idx, i),
ConvNormLayer(
ch_in=in_c,
ch_out=feat_out,
filter_size=5,
stride=1,
groups=feat_out,
norm_type=norm_type,
bias_on=False,
lr_scale=2.))
cls_subnet_convs.append(cls_conv_dw)
cls_conv_pw = self.add_sublayer(
'cls_conv_pw{}.{}'.format(stage_idx, i),
ConvNormLayer(
ch_in=in_c,
ch_out=feat_out,
filter_size=1,
stride=1,
norm_type=norm_type,
bias_on=False,
lr_scale=2.))
cls_subnet_convs.append(cls_conv_pw)
if not self.share_cls_reg:
reg_conv_dw = self.add_sublayer(
'reg_conv_dw{}.{}'.format(stage_idx, i),
ConvNormLayer(
ch_in=in_c,
ch_out=feat_out,
filter_size=5,
stride=1,
groups=feat_out,
norm_type=norm_type,
bias_on=False,
lr_scale=2.))
reg_subnet_convs.append(reg_conv_dw)
reg_conv_pw = self.add_sublayer(
'reg_conv_pw{}.{}'.format(stage_idx, i),
ConvNormLayer(
ch_in=in_c,
ch_out=feat_out,
filter_size=1,
stride=1,
norm_type=norm_type,
bias_on=False,
lr_scale=2.))
reg_subnet_convs.append(reg_conv_pw)
self.cls_convs.append(cls_subnet_convs)
self.reg_convs.append(reg_subnet_convs)
def act_func(self, x):
if self.act == "leaky_relu":
x = F.leaky_relu(x)
elif self.act == "hard_swish":
x = F.hardswish(x)
return x
def forward(self, fpn_feat, stage_idx):
assert stage_idx < len(self.cls_convs)
cls_feat = fpn_feat
reg_feat = fpn_feat
for i in range(len(self.cls_convs[stage_idx])):
cls_feat = self.act_func(self.cls_convs[stage_idx][i](cls_feat))
if not self.share_cls_reg:
reg_feat = self.act_func(self.reg_convs[stage_idx][i](reg_feat))
return cls_feat, reg_feat
@register
class PicoHead(OTAVFLHead):
"""
PicoHead
Args:
conv_feat (object): Instance of 'PicoFeat'
num_classes (int): Number of classes
fpn_stride (list): The stride of each FPN Layer
prior_prob (float): Used to set the bias init for the class prediction layer
loss_class (object): Instance of VariFocalLoss.
loss_dfl (object): Instance of DistributionFocalLoss.
loss_bbox (object): Instance of bbox loss.
assigner (object): Instance of label assigner.
reg_max: Max value of integral set :math: `{0, ..., reg_max}`
n QFL setting. Default: 7.
"""
__inject__ = [
'conv_feat', 'dgqp_module', 'loss_class', 'loss_dfl', 'loss_bbox',
'assigner', 'nms'
]
__shared__ = ['num_classes']
def __init__(self,
conv_feat='PicoFeat',
dgqp_module=None,
num_classes=80,
fpn_stride=[8, 16, 32],
prior_prob=0.01,
loss_class='VariFocalLoss',
loss_dfl='DistributionFocalLoss',
loss_bbox='GIoULoss',
assigner='SimOTAAssigner',
reg_max=16,
feat_in_chan=96,
nms=None,
nms_pre=1000,
cell_offset=0):
super(PicoHead, self).__init__(
conv_feat=conv_feat,
dgqp_module=dgqp_module,
num_classes=num_classes,
fpn_stride=fpn_stride,
prior_prob=prior_prob,
loss_class=loss_class,
loss_dfl=loss_dfl,
loss_bbox=loss_bbox,
assigner=assigner,
reg_max=reg_max,
feat_in_chan=feat_in_chan,
nms=nms,
nms_pre=nms_pre,
cell_offset=cell_offset)
self.conv_feat = conv_feat
self.num_classes = num_classes
self.fpn_stride = fpn_stride
self.prior_prob = prior_prob
self.loss_vfl = loss_class
self.loss_dfl = loss_dfl
self.loss_bbox = loss_bbox
self.assigner = assigner
self.reg_max = reg_max
self.feat_in_chan = feat_in_chan
self.nms = nms
self.nms_pre = nms_pre
self.cell_offset = cell_offset
self.use_sigmoid = self.loss_vfl.use_sigmoid
if self.use_sigmoid:
self.cls_out_channels = self.num_classes
else:
self.cls_out_channels = self.num_classes + 1
bias_init_value = -math.log((1 - self.prior_prob) / self.prior_prob)
# Clear the super class initialization
self.gfl_head_cls = None
self.gfl_head_reg = None
self.scales_regs = None
self.head_cls_list = []
self.head_reg_list = []
for i in range(len(fpn_stride)):
head_cls = self.add_sublayer(
"head_cls" + str(i),
nn.Conv2D(
in_channels=self.feat_in_chan,
out_channels=self.cls_out_channels + 4 * (self.reg_max + 1)
if self.conv_feat.share_cls_reg else self.cls_out_channels,
kernel_size=1,
stride=1,
padding=0,
weight_attr=ParamAttr(initializer=Normal(
mean=0., std=0.01)),
bias_attr=ParamAttr(
initializer=Constant(value=bias_init_value))))
self.head_cls_list.append(head_cls)
if not self.conv_feat.share_cls_reg:
head_reg = self.add_sublayer(
"head_reg" + str(i),
nn.Conv2D(
in_channels=self.feat_in_chan,
out_channels=4 * (self.reg_max + 1),
kernel_size=1,
stride=1,
padding=0,
weight_attr=ParamAttr(initializer=Normal(
mean=0., std=0.01)),
bias_attr=ParamAttr(initializer=Constant(value=0))))
self.head_reg_list.append(head_reg)
def forward(self, fpn_feats, deploy=False):
assert len(fpn_feats) == len(
self.fpn_stride
), "The size of fpn_feats is not equal to size of fpn_stride"
cls_logits_list = []
bboxes_reg_list = []
for i, fpn_feat in enumerate(fpn_feats):
conv_cls_feat, conv_reg_feat = self.conv_feat(fpn_feat, i)
if self.conv_feat.share_cls_reg:
cls_logits = self.head_cls_list[i](conv_cls_feat)
cls_score, bbox_pred = paddle.split(
cls_logits,
[self.cls_out_channels, 4 * (self.reg_max + 1)],
axis=1)
else:
cls_score = self.head_cls_list[i](conv_cls_feat)
bbox_pred = self.head_reg_list[i](conv_reg_feat)
if self.dgqp_module:
quality_score = self.dgqp_module(bbox_pred)
cls_score = F.sigmoid(cls_score) * quality_score
if deploy:
# Now only supports batch size = 1 in deploy
# TODO(ygh): support batch size > 1
cls_score = F.sigmoid(cls_score).reshape(
[1, self.cls_out_channels, -1]).transpose([0, 2, 1])
bbox_pred = bbox_pred.reshape([1, (self.reg_max + 1) * 4,
-1]).transpose([0, 2, 1])
elif not self.training:
cls_score = F.sigmoid(cls_score.transpose([0, 2, 3, 1]))
bbox_pred = bbox_pred.transpose([0, 2, 3, 1])
cls_logits_list.append(cls_score)
bboxes_reg_list.append(bbox_pred)
return (cls_logits_list, bboxes_reg_list)