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gccopen / models /common.py

Javier Flores

de28dc1 over 1 year ago

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	import math
	from copy import copy
	from pathlib import Path

	import numpy as np
	import pandas as pd
	import requests
	import torch
	import torch.nn as nn
	import torch.nn.functional as F
	from torchvision.ops import DeformConv2d
	from PIL import Image
	from torch.cuda import amp

	from utils.datasets import letterbox
	from utils.general import non_max_suppression, make_divisible, scale_coords, increment_path, xyxy2xywh
	from utils.plots import color_list, plot_one_box
	from utils.torch_utils import time_synchronized


	##### basic ####

	def autopad(k, p=None): # kernel, padding
	# Pad to 'same'
	if p is None:
	p = k // 2 if isinstance(k, int) else [x // 2 for x in k] # auto-pad
	return p


	class MP(nn.Module):
	def __init__(self, k=2):
	super(MP, self).__init__()
	self.m = nn.MaxPool2d(kernel_size=k, stride=k)

	def forward(self, x):
	return self.m(x)


	class SP(nn.Module):
	def __init__(self, k=3, s=1):
	super(SP, self).__init__()
	self.m = nn.MaxPool2d(kernel_size=k, stride=s, padding=k // 2)

	def forward(self, x):
	return self.m(x)


	class ReOrg(nn.Module):
	def __init__(self):
	super(ReOrg, self).__init__()

	def forward(self, x): # x(b,c,w,h) -> y(b,4c,w/2,h/2)
	return torch.cat([x[..., ::2, ::2], x[..., 1::2, ::2], x[..., ::2, 1::2], x[..., 1::2, 1::2]], 1)


	class Concat(nn.Module):
	def __init__(self, dimension=1):
	super(Concat, self).__init__()
	self.d = dimension

	def forward(self, x):
	return torch.cat(x, self.d)


	class Chuncat(nn.Module):
	def __init__(self, dimension=1):
	super(Chuncat, self).__init__()
	self.d = dimension

	def forward(self, x):
	x1 = []
	x2 = []
	for xi in x:
	xi1, xi2 = xi.chunk(2, self.d)
	x1.append(xi1)
	x2.append(xi2)
	return torch.cat(x1+x2, self.d)


	class Shortcut(nn.Module):
	def __init__(self, dimension=0):
	super(Shortcut, self).__init__()
	self.d = dimension

	def forward(self, x):
	return x[0]+x[1]


	class Foldcut(nn.Module):
	def __init__(self, dimension=0):
	super(Foldcut, self).__init__()
	self.d = dimension

	def forward(self, x):
	x1, x2 = x.chunk(2, self.d)
	return x1+x2


	class Conv(nn.Module):
	# Standard convolution
	def __init__(self, c1, c2, k=1, s=1, p=None, g=1, act=True): # ch_in, ch_out, kernel, stride, padding, groups
	super(Conv, self).__init__()
	self.conv = nn.Conv2d(c1, c2, k, s, autopad(k, p), groups=g, bias=False)
	self.bn = nn.BatchNorm2d(c2)
	self.act = nn.SiLU() if act is True else (act if isinstance(act, nn.Module) else nn.Identity())

	def forward(self, x):
	return self.act(self.bn(self.conv(x)))

	def fuseforward(self, x):
	return self.act(self.conv(x))


	class RobustConv(nn.Module):
	# Robust convolution (use high kernel size 7-11 for: downsampling and other layers). Train for 300 - 450 epochs.
	def __init__(self, c1, c2, k=7, s=1, p=None, g=1, act=True, layer_scale_init_value=1e-6): # ch_in, ch_out, kernel, stride, padding, groups
	super(RobustConv, self).__init__()
	self.conv_dw = Conv(c1, c1, k=k, s=s, p=p, g=c1, act=act)
	self.conv1x1 = nn.Conv2d(c1, c2, 1, 1, 0, groups=1, bias=True)
	self.gamma = nn.Parameter(layer_scale_init_value * torch.ones(c2)) if layer_scale_init_value > 0 else None

	def forward(self, x):
	x = x.to(memory_format=torch.channels_last)
	x = self.conv1x1(self.conv_dw(x))
	if self.gamma is not None:
	x = x.mul(self.gamma.reshape(1, -1, 1, 1))
	return x


	class RobustConv2(nn.Module):
	# Robust convolution 2 (use [32, 5, 2] or [32, 7, 4] or [32, 11, 8] for one of the paths in CSP).
	def __init__(self, c1, c2, k=7, s=4, p=None, g=1, act=True, layer_scale_init_value=1e-6): # ch_in, ch_out, kernel, stride, padding, groups
	super(RobustConv2, self).__init__()
	self.conv_strided = Conv(c1, c1, k=k, s=s, p=p, g=c1, act=act)
	self.conv_deconv = nn.ConvTranspose2d(in_channels=c1, out_channels=c2, kernel_size=s, stride=s,
	padding=0, bias=True, dilation=1, groups=1
	)
	self.gamma = nn.Parameter(layer_scale_init_value * torch.ones(c2)) if layer_scale_init_value > 0 else None

	def forward(self, x):
	x = self.conv_deconv(self.conv_strided(x))
	if self.gamma is not None:
	x = x.mul(self.gamma.reshape(1, -1, 1, 1))
	return x


	def DWConv(c1, c2, k=1, s=1, act=True):
	# Depthwise convolution
	return Conv(c1, c2, k, s, g=math.gcd(c1, c2), act=act)


	class GhostConv(nn.Module):
	# Ghost Convolution https://github.com/huawei-noah/ghostnet
	def __init__(self, c1, c2, k=1, s=1, g=1, act=True): # ch_in, ch_out, kernel, stride, groups
	super(GhostConv, self).__init__()
	c_ = c2 // 2 # hidden channels
	self.cv1 = Conv(c1, c_, k, s, None, g, act)
	self.cv2 = Conv(c_, c_, 5, 1, None, c_, act)

	def forward(self, x):
	y = self.cv1(x)
	return torch.cat([y, self.cv2(y)], 1)


	class Stem(nn.Module):
	# Stem
	def __init__(self, c1, c2, k=1, s=1, p=None, g=1, act=True): # ch_in, ch_out, kernel, stride, padding, groups
	super(Stem, self).__init__()
	c_ = int(c2/2) # hidden channels
	self.cv1 = Conv(c1, c_, 3, 2)
	self.cv2 = Conv(c_, c_, 1, 1)
	self.cv3 = Conv(c_, c_, 3, 2)
	self.pool = torch.nn.MaxPool2d(2, stride=2)
	self.cv4 = Conv(2 * c_, c2, 1, 1)

	def forward(self, x):
	x = self.cv1(x)
	return self.cv4(torch.cat((self.cv3(self.cv2(x)), self.pool(x)), dim=1))


	class DownC(nn.Module):
	# Spatial pyramid pooling layer used in YOLOv3-SPP
	def __init__(self, c1, c2, n=1, k=2):
	super(DownC, self).__init__()
	c_ = int(c1) # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c_, c2//2, 3, k)
	self.cv3 = Conv(c1, c2//2, 1, 1)
	self.mp = nn.MaxPool2d(kernel_size=k, stride=k)

	def forward(self, x):
	return torch.cat((self.cv2(self.cv1(x)), self.cv3(self.mp(x))), dim=1)


	class SPP(nn.Module):
	# Spatial pyramid pooling layer used in YOLOv3-SPP
	def __init__(self, c1, c2, k=(5, 9, 13)):
	super(SPP, self).__init__()
	c_ = c1 // 2 # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c_ * (len(k) + 1), c2, 1, 1)
	self.m = nn.ModuleList([nn.MaxPool2d(kernel_size=x, stride=1, padding=x // 2) for x in k])

	def forward(self, x):
	x = self.cv1(x)
	return self.cv2(torch.cat([x] + [m(x) for m in self.m], 1))


	class Bottleneck(nn.Module):
	# Darknet bottleneck
	def __init__(self, c1, c2, shortcut=True, g=1, e=0.5): # ch_in, ch_out, shortcut, groups, expansion
	super(Bottleneck, self).__init__()
	c_ = int(c2 * e) # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c_, c2, 3, 1, g=g)
	self.add = shortcut and c1 == c2

	def forward(self, x):
	return x + self.cv2(self.cv1(x)) if self.add else self.cv2(self.cv1(x))


	class Res(nn.Module):
	# ResNet bottleneck
	def __init__(self, c1, c2, shortcut=True, g=1, e=0.5): # ch_in, ch_out, shortcut, groups, expansion
	super(Res, self).__init__()
	c_ = int(c2 * e) # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c_, c_, 3, 1, g=g)
	self.cv3 = Conv(c_, c2, 1, 1)
	self.add = shortcut and c1 == c2

	def forward(self, x):
	return x + self.cv3(self.cv2(self.cv1(x))) if self.add else self.cv3(self.cv2(self.cv1(x)))


	class ResX(Res):
	# ResNet bottleneck
	def __init__(self, c1, c2, shortcut=True, g=32, e=0.5): # ch_in, ch_out, shortcut, groups, expansion
	super().__init__(c1, c2, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels


	class Ghost(nn.Module):
	# Ghost Bottleneck https://github.com/huawei-noah/ghostnet
	def __init__(self, c1, c2, k=3, s=1): # ch_in, ch_out, kernel, stride
	super(Ghost, self).__init__()
	c_ = c2 // 2
	self.conv = nn.Sequential(GhostConv(c1, c_, 1, 1), # pw
	DWConv(c_, c_, k, s, act=False) if s == 2 else nn.Identity(), # dw
	GhostConv(c_, c2, 1, 1, act=False)) # pw-linear
	self.shortcut = nn.Sequential(DWConv(c1, c1, k, s, act=False),
	Conv(c1, c2, 1, 1, act=False)) if s == 2 else nn.Identity()

	def forward(self, x):
	return self.conv(x) + self.shortcut(x)

	##### end of basic #####


	##### cspnet #####

	class SPPCSPC(nn.Module):
	# CSP https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=False, g=1, e=0.5, k=(5, 9, 13)):
	super(SPPCSPC, self).__init__()
	c_ = int(2 * c2 * e) # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c1, c_, 1, 1)
	self.cv3 = Conv(c_, c_, 3, 1)
	self.cv4 = Conv(c_, c_, 1, 1)
	self.m = nn.ModuleList([nn.MaxPool2d(kernel_size=x, stride=1, padding=x // 2) for x in k])
	self.cv5 = Conv(4 * c_, c_, 1, 1)
	self.cv6 = Conv(c_, c_, 3, 1)
	self.cv7 = Conv(2 * c_, c2, 1, 1)

	def forward(self, x):
	x1 = self.cv4(self.cv3(self.cv1(x)))
	y1 = self.cv6(self.cv5(torch.cat([x1] + [m(x1) for m in self.m], 1)))
	y2 = self.cv2(x)
	return self.cv7(torch.cat((y1, y2), dim=1))

	class GhostSPPCSPC(SPPCSPC):
	# CSP https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=False, g=1, e=0.5, k=(5, 9, 13)):
	super().__init__(c1, c2, n, shortcut, g, e, k)
	c_ = int(2 * c2 * e) # hidden channels
	self.cv1 = GhostConv(c1, c_, 1, 1)
	self.cv2 = GhostConv(c1, c_, 1, 1)
	self.cv3 = GhostConv(c_, c_, 3, 1)
	self.cv4 = GhostConv(c_, c_, 1, 1)
	self.cv5 = GhostConv(4 * c_, c_, 1, 1)
	self.cv6 = GhostConv(c_, c_, 3, 1)
	self.cv7 = GhostConv(2 * c_, c2, 1, 1)


	class GhostStem(Stem):
	# Stem
	def __init__(self, c1, c2, k=1, s=1, p=None, g=1, act=True): # ch_in, ch_out, kernel, stride, padding, groups
	super().__init__(c1, c2, k, s, p, g, act)
	c_ = int(c2/2) # hidden channels
	self.cv1 = GhostConv(c1, c_, 3, 2)
	self.cv2 = GhostConv(c_, c_, 1, 1)
	self.cv3 = GhostConv(c_, c_, 3, 2)
	self.cv4 = GhostConv(2 * c_, c2, 1, 1)


	class BottleneckCSPA(nn.Module):
	# CSP https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super(BottleneckCSPA, self).__init__()
	c_ = int(c2 * e) # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c1, c_, 1, 1)
	self.cv3 = Conv(2 * c_, c2, 1, 1)
	self.m = nn.Sequential(*[Bottleneck(c_, c_, shortcut, g, e=1.0) for _ in range(n)])

	def forward(self, x):
	y1 = self.m(self.cv1(x))
	y2 = self.cv2(x)
	return self.cv3(torch.cat((y1, y2), dim=1))


	class BottleneckCSPB(nn.Module):
	# CSP https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=False, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super(BottleneckCSPB, self).__init__()
	c_ = int(c2) # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c_, c_, 1, 1)
	self.cv3 = Conv(2 * c_, c2, 1, 1)
	self.m = nn.Sequential(*[Bottleneck(c_, c_, shortcut, g, e=1.0) for _ in range(n)])

	def forward(self, x):
	x1 = self.cv1(x)
	y1 = self.m(x1)
	y2 = self.cv2(x1)
	return self.cv3(torch.cat((y1, y2), dim=1))


	class BottleneckCSPC(nn.Module):
	# CSP https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super(BottleneckCSPC, self).__init__()
	c_ = int(c2 * e) # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c1, c_, 1, 1)
	self.cv3 = Conv(c_, c_, 1, 1)
	self.cv4 = Conv(2 * c_, c2, 1, 1)
	self.m = nn.Sequential(*[Bottleneck(c_, c_, shortcut, g, e=1.0) for _ in range(n)])

	def forward(self, x):
	y1 = self.cv3(self.m(self.cv1(x)))
	y2 = self.cv2(x)
	return self.cv4(torch.cat((y1, y2), dim=1))


	class ResCSPA(BottleneckCSPA):
	# CSP https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels
	self.m = nn.Sequential(*[Res(c_, c_, shortcut, g, e=0.5) for _ in range(n)])


	class ResCSPB(BottleneckCSPB):
	# CSP https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2) # hidden channels
	self.m = nn.Sequential(*[Res(c_, c_, shortcut, g, e=0.5) for _ in range(n)])


	class ResCSPC(BottleneckCSPC):
	# CSP https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels
	self.m = nn.Sequential(*[Res(c_, c_, shortcut, g, e=0.5) for _ in range(n)])


	class ResXCSPA(ResCSPA):
	# CSP https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=32, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels
	self.m = nn.Sequential(*[Res(c_, c_, shortcut, g, e=1.0) for _ in range(n)])


	class ResXCSPB(ResCSPB):
	# CSP https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=32, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2) # hidden channels
	self.m = nn.Sequential(*[Res(c_, c_, shortcut, g, e=1.0) for _ in range(n)])


	class ResXCSPC(ResCSPC):
	# CSP https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=32, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels
	self.m = nn.Sequential(*[Res(c_, c_, shortcut, g, e=1.0) for _ in range(n)])


	class GhostCSPA(BottleneckCSPA):
	# CSP https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels
	self.m = nn.Sequential(*[Ghost(c_, c_) for _ in range(n)])


	class GhostCSPB(BottleneckCSPB):
	# CSP https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2) # hidden channels
	self.m = nn.Sequential(*[Ghost(c_, c_) for _ in range(n)])


	class GhostCSPC(BottleneckCSPC):
	# CSP https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels
	self.m = nn.Sequential(*[Ghost(c_, c_) for _ in range(n)])

	##### end of cspnet #####


	##### yolor #####

	class ImplicitA(nn.Module):
	def __init__(self, channel, mean=0., std=.02):
	super(ImplicitA, self).__init__()
	self.channel = channel
	self.mean = mean
	self.std = std
	self.implicit = nn.Parameter(torch.zeros(1, channel, 1, 1))
	nn.init.normal_(self.implicit, mean=self.mean, std=self.std)

	def forward(self, x):
	return self.implicit + x


	class ImplicitM(nn.Module):
	def __init__(self, channel, mean=0., std=.02):
	super(ImplicitM, self).__init__()
	self.channel = channel
	self.mean = mean
	self.std = std
	self.implicit = nn.Parameter(torch.ones(1, channel, 1, 1))
	nn.init.normal_(self.implicit, mean=self.mean, std=self.std)

	def forward(self, x):
	return self.implicit * x

	##### end of yolor #####


	##### repvgg #####

	class RepConv(nn.Module):
	# Represented convolution
	# https://arxiv.org/abs/2101.03697

	def __init__(self, c1, c2, k=3, s=1, p=None, g=1, act=True, deploy=False):
	super(RepConv, self).__init__()

	self.deploy = deploy
	self.groups = g
	self.in_channels = c1
	self.out_channels = c2

	assert k == 3
	assert autopad(k, p) == 1

	padding_11 = autopad(k, p) - k // 2

	self.act = nn.SiLU() if act is True else (act if isinstance(act, nn.Module) else nn.Identity())

	if deploy:
	self.rbr_reparam = nn.Conv2d(c1, c2, k, s, autopad(k, p), groups=g, bias=True)

	else:
	self.rbr_identity = (nn.BatchNorm2d(num_features=c1) if c2 == c1 and s == 1 else None)

	self.rbr_dense = nn.Sequential(
	nn.Conv2d(c1, c2, k, s, autopad(k, p), groups=g, bias=False),
	nn.BatchNorm2d(num_features=c2),
	)

	self.rbr_1x1 = nn.Sequential(
	nn.Conv2d( c1, c2, 1, s, padding_11, groups=g, bias=False),
	nn.BatchNorm2d(num_features=c2),
	)

	def forward(self, inputs):
	if hasattr(self, "rbr_reparam"):
	return self.act(self.rbr_reparam(inputs))

	if self.rbr_identity is None:
	id_out = 0
	else:
	id_out = self.rbr_identity(inputs)

	return self.act(self.rbr_dense(inputs) + self.rbr_1x1(inputs) + id_out)

	def get_equivalent_kernel_bias(self):
	kernel3x3, bias3x3 = self._fuse_bn_tensor(self.rbr_dense)
	kernel1x1, bias1x1 = self._fuse_bn_tensor(self.rbr_1x1)
	kernelid, biasid = self._fuse_bn_tensor(self.rbr_identity)
	return (
	kernel3x3 + self._pad_1x1_to_3x3_tensor(kernel1x1) + kernelid,
	bias3x3 + bias1x1 + biasid,
	)

	def _pad_1x1_to_3x3_tensor(self, kernel1x1):
	if kernel1x1 is None:
	return 0
	else:
	return nn.functional.pad(kernel1x1, [1, 1, 1, 1])

	def _fuse_bn_tensor(self, branch):
	if branch is None:
	return 0, 0
	if isinstance(branch, nn.Sequential):
	kernel = branch[0].weight
	running_mean = branch[1].running_mean
	running_var = branch[1].running_var
	gamma = branch[1].weight
	beta = branch[1].bias
	eps = branch[1].eps
	else:
	assert isinstance(branch, nn.BatchNorm2d)
	if not hasattr(self, "id_tensor"):
	input_dim = self.in_channels // self.groups
	kernel_value = np.zeros(
	(self.in_channels, input_dim, 3, 3), dtype=np.float32
	)
	for i in range(self.in_channels):
	kernel_value[i, i % input_dim, 1, 1] = 1
	self.id_tensor = torch.from_numpy(kernel_value).to(branch.weight.device)
	kernel = self.id_tensor
	running_mean = branch.running_mean
	running_var = branch.running_var
	gamma = branch.weight
	beta = branch.bias
	eps = branch.eps
	std = (running_var + eps).sqrt()
	t = (gamma / std).reshape(-1, 1, 1, 1)
	return kernel * t, beta - running_mean * gamma / std

	def repvgg_convert(self):
	kernel, bias = self.get_equivalent_kernel_bias()
	return (
	kernel.detach().cpu().numpy(),
	bias.detach().cpu().numpy(),
	)

	def fuse_conv_bn(self, conv, bn):

	std = (bn.running_var + bn.eps).sqrt()
	bias = bn.bias - bn.running_mean * bn.weight / std

	t = (bn.weight / std).reshape(-1, 1, 1, 1)
	weights = conv.weight * t

	bn = nn.Identity()
	conv = nn.Conv2d(in_channels = conv.in_channels,
	out_channels = conv.out_channels,
	kernel_size = conv.kernel_size,
	stride=conv.stride,
	padding = conv.padding,
	dilation = conv.dilation,
	groups = conv.groups,
	bias = True,
	padding_mode = conv.padding_mode)

	conv.weight = torch.nn.Parameter(weights)
	conv.bias = torch.nn.Parameter(bias)
	return conv

	def fuse_repvgg_block(self):
	if self.deploy:
	return
	print(f"RepConv.fuse_repvgg_block")

	self.rbr_dense = self.fuse_conv_bn(self.rbr_dense[0], self.rbr_dense[1])

	self.rbr_1x1 = self.fuse_conv_bn(self.rbr_1x1[0], self.rbr_1x1[1])
	rbr_1x1_bias = self.rbr_1x1.bias
	weight_1x1_expanded = torch.nn.functional.pad(self.rbr_1x1.weight, [1, 1, 1, 1])

	# Fuse self.rbr_identity
	if (isinstance(self.rbr_identity, nn.BatchNorm2d) or isinstance(self.rbr_identity, nn.modules.batchnorm.SyncBatchNorm)):
	# print(f"fuse: rbr_identity == BatchNorm2d or SyncBatchNorm")
	identity_conv_1x1 = nn.Conv2d(
	in_channels=self.in_channels,
	out_channels=self.out_channels,
	kernel_size=1,
	stride=1,
	padding=0,
	groups=self.groups,
	bias=False)
	identity_conv_1x1.weight.data = identity_conv_1x1.weight.data.to(self.rbr_1x1.weight.data.device)
	identity_conv_1x1.weight.data = identity_conv_1x1.weight.data.squeeze().squeeze()
	# print(f" identity_conv_1x1.weight = {identity_conv_1x1.weight.shape}")
	identity_conv_1x1.weight.data.fill_(0.0)
	identity_conv_1x1.weight.data.fill_diagonal_(1.0)
	identity_conv_1x1.weight.data = identity_conv_1x1.weight.data.unsqueeze(2).unsqueeze(3)
	# print(f" identity_conv_1x1.weight = {identity_conv_1x1.weight.shape}")

	identity_conv_1x1 = self.fuse_conv_bn(identity_conv_1x1, self.rbr_identity)
	bias_identity_expanded = identity_conv_1x1.bias
	weight_identity_expanded = torch.nn.functional.pad(identity_conv_1x1.weight, [1, 1, 1, 1])
	else:
	# print(f"fuse: rbr_identity != BatchNorm2d, rbr_identity = {self.rbr_identity}")
	bias_identity_expanded = torch.nn.Parameter( torch.zeros_like(rbr_1x1_bias) )
	weight_identity_expanded = torch.nn.Parameter( torch.zeros_like(weight_1x1_expanded) )


	#print(f"self.rbr_1x1.weight = {self.rbr_1x1.weight.shape}, ")
	#print(f"weight_1x1_expanded = {weight_1x1_expanded.shape}, ")
	#print(f"self.rbr_dense.weight = {self.rbr_dense.weight.shape}, ")

	self.rbr_dense.weight = torch.nn.Parameter(self.rbr_dense.weight + weight_1x1_expanded + weight_identity_expanded)
	self.rbr_dense.bias = torch.nn.Parameter(self.rbr_dense.bias + rbr_1x1_bias + bias_identity_expanded)

	self.rbr_reparam = self.rbr_dense
	self.deploy = True

	if self.rbr_identity is not None:
	del self.rbr_identity
	self.rbr_identity = None

	if self.rbr_1x1 is not None:
	del self.rbr_1x1
	self.rbr_1x1 = None

	if self.rbr_dense is not None:
	del self.rbr_dense
	self.rbr_dense = None


	class RepBottleneck(Bottleneck):
	# Standard bottleneck
	def __init__(self, c1, c2, shortcut=True, g=1, e=0.5): # ch_in, ch_out, shortcut, groups, expansion
	super().__init__(c1, c2, shortcut=True, g=1, e=0.5)
	c_ = int(c2 * e) # hidden channels
	self.cv2 = RepConv(c_, c2, 3, 1, g=g)


	class RepBottleneckCSPA(BottleneckCSPA):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels
	self.m = nn.Sequential(*[RepBottleneck(c_, c_, shortcut, g, e=1.0) for _ in range(n)])


	class RepBottleneckCSPB(BottleneckCSPB):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=False, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2) # hidden channels
	self.m = nn.Sequential(*[RepBottleneck(c_, c_, shortcut, g, e=1.0) for _ in range(n)])


	class RepBottleneckCSPC(BottleneckCSPC):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels
	self.m = nn.Sequential(*[RepBottleneck(c_, c_, shortcut, g, e=1.0) for _ in range(n)])


	class RepRes(Res):
	# Standard bottleneck
	def __init__(self, c1, c2, shortcut=True, g=1, e=0.5): # ch_in, ch_out, shortcut, groups, expansion
	super().__init__(c1, c2, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels
	self.cv2 = RepConv(c_, c_, 3, 1, g=g)


	class RepResCSPA(ResCSPA):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels
	self.m = nn.Sequential(*[RepRes(c_, c_, shortcut, g, e=0.5) for _ in range(n)])


	class RepResCSPB(ResCSPB):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=False, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2) # hidden channels
	self.m = nn.Sequential(*[RepRes(c_, c_, shortcut, g, e=0.5) for _ in range(n)])


	class RepResCSPC(ResCSPC):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels
	self.m = nn.Sequential(*[RepRes(c_, c_, shortcut, g, e=0.5) for _ in range(n)])


	class RepResX(ResX):
	# Standard bottleneck
	def __init__(self, c1, c2, shortcut=True, g=32, e=0.5): # ch_in, ch_out, shortcut, groups, expansion
	super().__init__(c1, c2, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels
	self.cv2 = RepConv(c_, c_, 3, 1, g=g)


	class RepResXCSPA(ResXCSPA):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=32, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels
	self.m = nn.Sequential(*[RepResX(c_, c_, shortcut, g, e=0.5) for _ in range(n)])


	class RepResXCSPB(ResXCSPB):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=False, g=32, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2) # hidden channels
	self.m = nn.Sequential(*[RepResX(c_, c_, shortcut, g, e=0.5) for _ in range(n)])


	class RepResXCSPC(ResXCSPC):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=32, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super().__init__(c1, c2, n, shortcut, g, e)
	c_ = int(c2 * e) # hidden channels
	self.m = nn.Sequential(*[RepResX(c_, c_, shortcut, g, e=0.5) for _ in range(n)])

	##### end of repvgg #####


	##### transformer #####

	class TransformerLayer(nn.Module):
	# Transformer layer https://arxiv.org/abs/2010.11929 (LayerNorm layers removed for better performance)
	def __init__(self, c, num_heads):
	super().__init__()
	self.q = nn.Linear(c, c, bias=False)
	self.k = nn.Linear(c, c, bias=False)
	self.v = nn.Linear(c, c, bias=False)
	self.ma = nn.MultiheadAttention(embed_dim=c, num_heads=num_heads)
	self.fc1 = nn.Linear(c, c, bias=False)
	self.fc2 = nn.Linear(c, c, bias=False)

	def forward(self, x):
	x = self.ma(self.q(x), self.k(x), self.v(x))[0] + x
	x = self.fc2(self.fc1(x)) + x
	return x


	class TransformerBlock(nn.Module):
	# Vision Transformer https://arxiv.org/abs/2010.11929
	def __init__(self, c1, c2, num_heads, num_layers):
	super().__init__()
	self.conv = None
	if c1 != c2:
	self.conv = Conv(c1, c2)
	self.linear = nn.Linear(c2, c2) # learnable position embedding
	self.tr = nn.Sequential(*[TransformerLayer(c2, num_heads) for _ in range(num_layers)])
	self.c2 = c2

	def forward(self, x):
	if self.conv is not None:
	x = self.conv(x)
	b, _, w, h = x.shape
	p = x.flatten(2)
	p = p.unsqueeze(0)
	p = p.transpose(0, 3)
	p = p.squeeze(3)
	e = self.linear(p)
	x = p + e

	x = self.tr(x)
	x = x.unsqueeze(3)
	x = x.transpose(0, 3)
	x = x.reshape(b, self.c2, w, h)
	return x

	##### end of transformer #####


	##### yolov5 #####

	class Focus(nn.Module):
	# Focus wh information into c-space
	def __init__(self, c1, c2, k=1, s=1, p=None, g=1, act=True): # ch_in, ch_out, kernel, stride, padding, groups
	super(Focus, self).__init__()
	self.conv = Conv(c1 * 4, c2, k, s, p, g, act)
	# self.contract = Contract(gain=2)

	def forward(self, x): # x(b,c,w,h) -> y(b,4c,w/2,h/2)
	return self.conv(torch.cat([x[..., ::2, ::2], x[..., 1::2, ::2], x[..., ::2, 1::2], x[..., 1::2, 1::2]], 1))
	# return self.conv(self.contract(x))


	class SPPF(nn.Module):
	# Spatial Pyramid Pooling - Fast (SPPF) layer for YOLOv5 by Glenn Jocher
	def __init__(self, c1, c2, k=5): # equivalent to SPP(k=(5, 9, 13))
	super().__init__()
	c_ = c1 // 2 # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c_ * 4, c2, 1, 1)
	self.m = nn.MaxPool2d(kernel_size=k, stride=1, padding=k // 2)

	def forward(self, x):
	x = self.cv1(x)
	y1 = self.m(x)
	y2 = self.m(y1)
	return self.cv2(torch.cat([x, y1, y2, self.m(y2)], 1))


	class Contract(nn.Module):
	# Contract width-height into channels, i.e. x(1,64,80,80) to x(1,256,40,40)
	def __init__(self, gain=2):
	super().__init__()
	self.gain = gain

	def forward(self, x):
	N, C, H, W = x.size() # assert (H / s == 0) and (W / s == 0), 'Indivisible gain'
	s = self.gain
	x = x.view(N, C, H // s, s, W // s, s) # x(1,64,40,2,40,2)
	x = x.permute(0, 3, 5, 1, 2, 4).contiguous() # x(1,2,2,64,40,40)
	return x.view(N, C * s * s, H // s, W // s) # x(1,256,40,40)


	class Expand(nn.Module):
	# Expand channels into width-height, i.e. x(1,64,80,80) to x(1,16,160,160)
	def __init__(self, gain=2):
	super().__init__()
	self.gain = gain

	def forward(self, x):
	N, C, H, W = x.size() # assert C / s ** 2 == 0, 'Indivisible gain'
	s = self.gain
	x = x.view(N, s, s, C // s ** 2, H, W) # x(1,2,2,16,80,80)
	x = x.permute(0, 3, 4, 1, 5, 2).contiguous() # x(1,16,80,2,80,2)
	return x.view(N, C // s ** 2, H * s, W * s) # x(1,16,160,160)


	class NMS(nn.Module):
	# Non-Maximum Suppression (NMS) module
	conf = 0.25 # confidence threshold
	iou = 0.45 # IoU threshold
	classes = None # (optional list) filter by class

	def __init__(self):
	super(NMS, self).__init__()

	def forward(self, x):
	return non_max_suppression(x[0], conf_thres=self.conf, iou_thres=self.iou, classes=self.classes)


	class autoShape(nn.Module):
	# input-robust model wrapper for passing cv2/np/PIL/torch inputs. Includes preprocessing, inference and NMS
	conf = 0.25 # NMS confidence threshold
	iou = 0.45 # NMS IoU threshold
	classes = None # (optional list) filter by class

	def __init__(self, model):
	super(autoShape, self).__init__()
	self.model = model.eval()

	def autoshape(self):
	print('autoShape already enabled, skipping... ') # model already converted to model.autoshape()
	return self

	@torch.no_grad()
	def forward(self, imgs, size=640, augment=False, profile=False):
	# Inference from various sources. For height=640, width=1280, RGB images example inputs are:
	# filename: imgs = 'data/samples/zidane.jpg'
	# URI: = 'https://github.com/ultralytics/yolov5/releases/download/v1.0/zidane.jpg'
	# OpenCV: = cv2.imread('image.jpg')[:,:,::-1] # HWC BGR to RGB x(640,1280,3)
	# PIL: = Image.open('image.jpg') # HWC x(640,1280,3)
	# numpy: = np.zeros((640,1280,3)) # HWC
	# torch: = torch.zeros(16,3,320,640) # BCHW (scaled to size=640, 0-1 values)
	# multiple: = [Image.open('image1.jpg'), Image.open('image2.jpg'), ...] # list of images

	t = [time_synchronized()]
	p = next(self.model.parameters()) # for device and type
	if isinstance(imgs, torch.Tensor): # torch
	with amp.autocast(enabled=p.device.type != 'cpu'):
	return self.model(imgs.to(p.device).type_as(p), augment, profile) # inference

	# Pre-process
	n, imgs = (len(imgs), imgs) if isinstance(imgs, list) else (1, [imgs]) # number of images, list of images
	shape0, shape1, files = [], [], [] # image and inference shapes, filenames
	for i, im in enumerate(imgs):
	f = f'image{i}' # filename
	if isinstance(im, str): # filename or uri
	im, f = np.asarray(Image.open(requests.get(im, stream=True).raw if im.startswith('http') else im)), im
	elif isinstance(im, Image.Image): # PIL Image
	im, f = np.asarray(im), getattr(im, 'filename', f) or f
	files.append(Path(f).with_suffix('.jpg').name)
	if im.shape[0] < 5: # image in CHW
	im = im.transpose((1, 2, 0)) # reverse dataloader .transpose(2, 0, 1)
	im = im[:, :, :3] if im.ndim == 3 else np.tile(im[:, :, None], 3) # enforce 3ch input
	s = im.shape[:2] # HWC
	shape0.append(s) # image shape
	g = (size / max(s)) # gain
	shape1.append([y * g for y in s])
	imgs[i] = im # update
	shape1 = [make_divisible(x, int(self.stride.max())) for x in np.stack(shape1, 0).max(0)] # inference shape
	x = [letterbox(im, new_shape=shape1, auto=False)[0] for im in imgs] # pad
	x = np.stack(x, 0) if n > 1 else x[0][None] # stack
	x = np.ascontiguousarray(x.transpose((0, 3, 1, 2))) # BHWC to BCHW
	x = torch.from_numpy(x).to(p.device).type_as(p) / 255. # uint8 to fp16/32
	t.append(time_synchronized())

	with amp.autocast(enabled=p.device.type != 'cpu'):
	# Inference
	y = self.model(x, augment, profile)[0] # forward
	t.append(time_synchronized())

	# Post-process
	y = non_max_suppression(y, conf_thres=self.conf, iou_thres=self.iou, classes=self.classes) # NMS
	for i in range(n):
	scale_coords(shape1, y[i][:, :4], shape0[i])

	t.append(time_synchronized())
	return Detections(imgs, y, files, t, self.names, x.shape)


	class Detections:
	# detections class for YOLOv5 inference results
	def __init__(self, imgs, pred, files, times=None, names=None, shape=None):
	super(Detections, self).__init__()
	d = pred[0].device # device
	gn = [torch.tensor([*[im.shape[i] for i in [1, 0, 1, 0]], 1., 1.], device=d) for im in imgs] # normalizations
	self.imgs = imgs # list of images as numpy arrays
	self.pred = pred # list of tensors pred[0] = (xyxy, conf, cls)
	self.names = names # class names
	self.files = files # image filenames
	self.xyxy = pred # xyxy pixels
	self.xywh = [xyxy2xywh(x) for x in pred] # xywh pixels
	self.xyxyn = [x / g for x, g in zip(self.xyxy, gn)] # xyxy normalized
	self.xywhn = [x / g for x, g in zip(self.xywh, gn)] # xywh normalized
	self.n = len(self.pred) # number of images (batch size)
	self.t = tuple((times[i + 1] - times[i]) * 1000 / self.n for i in range(3)) # timestamps (ms)
	self.s = shape # inference BCHW shape

	def display(self, pprint=False, show=False, save=False, render=False, save_dir=''):
	colors = color_list()
	for i, (img, pred) in enumerate(zip(self.imgs, self.pred)):
	str = f'image {i + 1}/{len(self.pred)}: {img.shape[0]}x{img.shape[1]} '
	if pred is not None:
	for c in pred[:, -1].unique():
	n = (pred[:, -1] == c).sum() # detections per class
	str += f"{n} {self.names[int(c)]}{'s' * (n > 1)}, " # add to string
	if show or save or render:
	for *box, conf, cls in pred: # xyxy, confidence, class
	label = f'{self.names[int(cls)]} {conf:.2f}'
	plot_one_box(box, img, label=label, color=colors[int(cls) % 10])
	img = Image.fromarray(img.astype(np.uint8)) if isinstance(img, np.ndarray) else img # from np
	if pprint:
	print(str.rstrip(', '))
	if show:
	img.show(self.files[i]) # show
	if save:
	f = self.files[i]
	img.save(Path(save_dir) / f) # save
	print(f"{'Saved' * (i == 0)} {f}", end=',' if i < self.n - 1 else f' to {save_dir}\n')
	if render:
	self.imgs[i] = np.asarray(img)

	def print(self):
	self.display(pprint=True) # print results
	print(f'Speed: %.1fms pre-process, %.1fms inference, %.1fms NMS per image at shape {tuple(self.s)}' % self.t)

	def show(self):
	self.display(show=True) # show results

	def save(self, save_dir='runs/hub/exp'):
	save_dir = increment_path(save_dir, exist_ok=save_dir != 'runs/hub/exp') # increment save_dir
	Path(save_dir).mkdir(parents=True, exist_ok=True)
	self.display(save=True, save_dir=save_dir) # save results

	def render(self):
	self.display(render=True) # render results
	return self.imgs

	def pandas(self):
	# return detections as pandas DataFrames, i.e. print(results.pandas().xyxy[0])
	new = copy(self) # return copy
	ca = 'xmin', 'ymin', 'xmax', 'ymax', 'confidence', 'class', 'name' # xyxy columns
	cb = 'xcenter', 'ycenter', 'width', 'height', 'confidence', 'class', 'name' # xywh columns
	for k, c in zip(['xyxy', 'xyxyn', 'xywh', 'xywhn'], [ca, ca, cb, cb]):
	a = [[x[:5] + [int(x[5]), self.names[int(x[5])]] for x in x.tolist()] for x in getattr(self, k)] # update
	setattr(new, k, [pd.DataFrame(x, columns=c) for x in a])
	return new

	def tolist(self):
	# return a list of Detections objects, i.e. 'for result in results.tolist():'
	x = [Detections([self.imgs[i]], [self.pred[i]], self.names, self.s) for i in range(self.n)]
	for d in x:
	for k in ['imgs', 'pred', 'xyxy', 'xyxyn', 'xywh', 'xywhn']:
	setattr(d, k, getattr(d, k)[0]) # pop out of list
	return x

	def __len__(self):
	return self.n


	class Classify(nn.Module):
	# Classification head, i.e. x(b,c1,20,20) to x(b,c2)
	def __init__(self, c1, c2, k=1, s=1, p=None, g=1): # ch_in, ch_out, kernel, stride, padding, groups
	super(Classify, self).__init__()
	self.aap = nn.AdaptiveAvgPool2d(1) # to x(b,c1,1,1)
	self.conv = nn.Conv2d(c1, c2, k, s, autopad(k, p), groups=g) # to x(b,c2,1,1)
	self.flat = nn.Flatten()

	def forward(self, x):
	z = torch.cat([self.aap(y) for y in (x if isinstance(x, list) else [x])], 1) # cat if list
	return self.flat(self.conv(z)) # flatten to x(b,c2)

	##### end of yolov5 ######


	##### orepa #####

	def transI_fusebn(kernel, bn):
	gamma = bn.weight
	std = (bn.running_var + bn.eps).sqrt()
	return kernel * ((gamma / std).reshape(-1, 1, 1, 1)), bn.bias - bn.running_mean * gamma / std


	class ConvBN(nn.Module):
	def __init__(self, in_channels, out_channels, kernel_size,
	stride=1, padding=0, dilation=1, groups=1, deploy=False, nonlinear=None):
	super().__init__()
	if nonlinear is None:
	self.nonlinear = nn.Identity()
	else:
	self.nonlinear = nonlinear
	if deploy:
	self.conv = nn.Conv2d(in_channels=in_channels, out_channels=out_channels, kernel_size=kernel_size,
	stride=stride, padding=padding, dilation=dilation, groups=groups, bias=True)
	else:
	self.conv = nn.Conv2d(in_channels=in_channels, out_channels=out_channels, kernel_size=kernel_size,
	stride=stride, padding=padding, dilation=dilation, groups=groups, bias=False)
	self.bn = nn.BatchNorm2d(num_features=out_channels)

	def forward(self, x):
	if hasattr(self, 'bn'):
	return self.nonlinear(self.bn(self.conv(x)))
	else:
	return self.nonlinear(self.conv(x))

	def switch_to_deploy(self):
	kernel, bias = transI_fusebn(self.conv.weight, self.bn)
	conv = nn.Conv2d(in_channels=self.conv.in_channels, out_channels=self.conv.out_channels, kernel_size=self.conv.kernel_size,
	stride=self.conv.stride, padding=self.conv.padding, dilation=self.conv.dilation, groups=self.conv.groups, bias=True)
	conv.weight.data = kernel
	conv.bias.data = bias
	for para in self.parameters():
	para.detach_()
	self.__delattr__('conv')
	self.__delattr__('bn')
	self.conv = conv

	class OREPA_3x3_RepConv(nn.Module):

	def __init__(self, in_channels, out_channels, kernel_size,
	stride=1, padding=0, dilation=1, groups=1,
	internal_channels_1x1_3x3=None,
	deploy=False, nonlinear=None, single_init=False):
	super(OREPA_3x3_RepConv, self).__init__()
	self.deploy = deploy

	if nonlinear is None:
	self.nonlinear = nn.Identity()
	else:
	self.nonlinear = nonlinear

	self.kernel_size = kernel_size
	self.in_channels = in_channels
	self.out_channels = out_channels
	self.groups = groups
	assert padding == kernel_size // 2

	self.stride = stride
	self.padding = padding
	self.dilation = dilation

	self.branch_counter = 0

	self.weight_rbr_origin = nn.Parameter(torch.Tensor(out_channels, int(in_channels/self.groups), kernel_size, kernel_size))
	nn.init.kaiming_uniform_(self.weight_rbr_origin, a=math.sqrt(1.0))
	self.branch_counter += 1


	if groups < out_channels:
	self.weight_rbr_avg_conv = nn.Parameter(torch.Tensor(out_channels, int(in_channels/self.groups), 1, 1))
	self.weight_rbr_pfir_conv = nn.Parameter(torch.Tensor(out_channels, int(in_channels/self.groups), 1, 1))
	nn.init.kaiming_uniform_(self.weight_rbr_avg_conv, a=1.0)
	nn.init.kaiming_uniform_(self.weight_rbr_pfir_conv, a=1.0)
	self.weight_rbr_avg_conv.data
	self.weight_rbr_pfir_conv.data
	self.register_buffer('weight_rbr_avg_avg', torch.ones(kernel_size, kernel_size).mul(1.0/kernel_size/kernel_size))
	self.branch_counter += 1

	else:
	raise NotImplementedError
	self.branch_counter += 1

	if internal_channels_1x1_3x3 is None:
	internal_channels_1x1_3x3 = in_channels if groups < out_channels else 2 * in_channels # For mobilenet, it is better to have 2X internal channels

	if internal_channels_1x1_3x3 == in_channels:
	self.weight_rbr_1x1_kxk_idconv1 = nn.Parameter(torch.zeros(in_channels, int(in_channels/self.groups), 1, 1))
	id_value = np.zeros((in_channels, int(in_channels/self.groups), 1, 1))
	for i in range(in_channels):
	id_value[i, i % int(in_channels/self.groups), 0, 0] = 1
	id_tensor = torch.from_numpy(id_value).type_as(self.weight_rbr_1x1_kxk_idconv1)
	self.register_buffer('id_tensor', id_tensor)

	else:
	self.weight_rbr_1x1_kxk_conv1 = nn.Parameter(torch.Tensor(internal_channels_1x1_3x3, int(in_channels/self.groups), 1, 1))
	nn.init.kaiming_uniform_(self.weight_rbr_1x1_kxk_conv1, a=math.sqrt(1.0))
	self.weight_rbr_1x1_kxk_conv2 = nn.Parameter(torch.Tensor(out_channels, int(internal_channels_1x1_3x3/self.groups), kernel_size, kernel_size))
	nn.init.kaiming_uniform_(self.weight_rbr_1x1_kxk_conv2, a=math.sqrt(1.0))
	self.branch_counter += 1

	expand_ratio = 8
	self.weight_rbr_gconv_dw = nn.Parameter(torch.Tensor(in_channels*expand_ratio, 1, kernel_size, kernel_size))
	self.weight_rbr_gconv_pw = nn.Parameter(torch.Tensor(out_channels, in_channels*expand_ratio, 1, 1))
	nn.init.kaiming_uniform_(self.weight_rbr_gconv_dw, a=math.sqrt(1.0))
	nn.init.kaiming_uniform_(self.weight_rbr_gconv_pw, a=math.sqrt(1.0))
	self.branch_counter += 1

	if out_channels == in_channels and stride == 1:
	self.branch_counter += 1

	self.vector = nn.Parameter(torch.Tensor(self.branch_counter, self.out_channels))
	self.bn = nn.BatchNorm2d(out_channels)

	self.fre_init()

	nn.init.constant_(self.vector[0, :], 0.25) #origin
	nn.init.constant_(self.vector[1, :], 0.25) #avg
	nn.init.constant_(self.vector[2, :], 0.0) #prior
	nn.init.constant_(self.vector[3, :], 0.5) #1x1_kxk
	nn.init.constant_(self.vector[4, :], 0.5) #dws_conv


	def fre_init(self):
	prior_tensor = torch.Tensor(self.out_channels, self.kernel_size, self.kernel_size)
	half_fg = self.out_channels/2
	for i in range(self.out_channels):
	for h in range(3):
	for w in range(3):
	if i < half_fg:
	prior_tensor[i, h, w] = math.cos(math.pi(h+0.5)(i+1)/3)
	else:
	prior_tensor[i, h, w] = math.cos(math.pi(w+0.5)(i+1-half_fg)/3)

	self.register_buffer('weight_rbr_prior', prior_tensor)

	def weight_gen(self):

	weight_rbr_origin = torch.einsum('oihw,o->oihw', self.weight_rbr_origin, self.vector[0, :])

	weight_rbr_avg = torch.einsum('oihw,o->oihw', torch.einsum('oihw,hw->oihw', self.weight_rbr_avg_conv, self.weight_rbr_avg_avg), self.vector[1, :])

	weight_rbr_pfir = torch.einsum('oihw,o->oihw', torch.einsum('oihw,ohw->oihw', self.weight_rbr_pfir_conv, self.weight_rbr_prior), self.vector[2, :])

	weight_rbr_1x1_kxk_conv1 = None
	if hasattr(self, 'weight_rbr_1x1_kxk_idconv1'):
	weight_rbr_1x1_kxk_conv1 = (self.weight_rbr_1x1_kxk_idconv1 + self.id_tensor).squeeze()
	elif hasattr(self, 'weight_rbr_1x1_kxk_conv1'):
	weight_rbr_1x1_kxk_conv1 = self.weight_rbr_1x1_kxk_conv1.squeeze()
	else:
	raise NotImplementedError
	weight_rbr_1x1_kxk_conv2 = self.weight_rbr_1x1_kxk_conv2

	if self.groups > 1:
	g = self.groups
	t, ig = weight_rbr_1x1_kxk_conv1.size()
	o, tg, h, w = weight_rbr_1x1_kxk_conv2.size()
	weight_rbr_1x1_kxk_conv1 = weight_rbr_1x1_kxk_conv1.view(g, int(t/g), ig)
	weight_rbr_1x1_kxk_conv2 = weight_rbr_1x1_kxk_conv2.view(g, int(o/g), tg, h, w)
	weight_rbr_1x1_kxk = torch.einsum('gti,gothw->goihw', weight_rbr_1x1_kxk_conv1, weight_rbr_1x1_kxk_conv2).view(o, ig, h, w)
	else:
	weight_rbr_1x1_kxk = torch.einsum('ti,othw->oihw', weight_rbr_1x1_kxk_conv1, weight_rbr_1x1_kxk_conv2)

	weight_rbr_1x1_kxk = torch.einsum('oihw,o->oihw', weight_rbr_1x1_kxk, self.vector[3, :])

	weight_rbr_gconv = self.dwsc2full(self.weight_rbr_gconv_dw, self.weight_rbr_gconv_pw, self.in_channels)
	weight_rbr_gconv = torch.einsum('oihw,o->oihw', weight_rbr_gconv, self.vector[4, :])

	weight = weight_rbr_origin + weight_rbr_avg + weight_rbr_1x1_kxk + weight_rbr_pfir + weight_rbr_gconv

	return weight

	def dwsc2full(self, weight_dw, weight_pw, groups):

	t, ig, h, w = weight_dw.size()
	o, _, _, _ = weight_pw.size()
	tg = int(t/groups)
	i = int(ig*groups)
	weight_dw = weight_dw.view(groups, tg, ig, h, w)
	weight_pw = weight_pw.squeeze().view(o, groups, tg)

	weight_dsc = torch.einsum('gtihw,ogt->ogihw', weight_dw, weight_pw)
	return weight_dsc.view(o, i, h, w)

	def forward(self, inputs):
	weight = self.weight_gen()
	out = F.conv2d(inputs, weight, bias=None, stride=self.stride, padding=self.padding, dilation=self.dilation, groups=self.groups)

	return self.nonlinear(self.bn(out))

	class RepConv_OREPA(nn.Module):

	def __init__(self, c1, c2, k=3, s=1, padding=1, dilation=1, groups=1, padding_mode='zeros', deploy=False, use_se=False, nonlinear=nn.SiLU()):
	super(RepConv_OREPA, self).__init__()
	self.deploy = deploy
	self.groups = groups
	self.in_channels = c1
	self.out_channels = c2

	self.padding = padding
	self.dilation = dilation
	self.groups = groups

	assert k == 3
	assert padding == 1

	padding_11 = padding - k // 2

	if nonlinear is None:
	self.nonlinearity = nn.Identity()
	else:
	self.nonlinearity = nonlinear

	if use_se:
	self.se = SEBlock(self.out_channels, internal_neurons=self.out_channels // 16)
	else:
	self.se = nn.Identity()

	if deploy:
	self.rbr_reparam = nn.Conv2d(in_channels=self.in_channels, out_channels=self.out_channels, kernel_size=k, stride=s,
	padding=padding, dilation=dilation, groups=groups, bias=True, padding_mode=padding_mode)

	else:
	self.rbr_identity = nn.BatchNorm2d(num_features=self.in_channels) if self.out_channels == self.in_channels and s == 1 else None
	self.rbr_dense = OREPA_3x3_RepConv(in_channels=self.in_channels, out_channels=self.out_channels, kernel_size=k, stride=s, padding=padding, groups=groups, dilation=1)
	self.rbr_1x1 = ConvBN(in_channels=self.in_channels, out_channels=self.out_channels, kernel_size=1, stride=s, padding=padding_11, groups=groups, dilation=1)
	print('RepVGG Block, identity = ', self.rbr_identity)


	def forward(self, inputs):
	if hasattr(self, 'rbr_reparam'):
	return self.nonlinearity(self.se(self.rbr_reparam(inputs)))

	if self.rbr_identity is None:
	id_out = 0
	else:
	id_out = self.rbr_identity(inputs)

	out1 = self.rbr_dense(inputs)
	out2 = self.rbr_1x1(inputs)
	out3 = id_out
	out = out1 + out2 + out3

	return self.nonlinearity(self.se(out))


	# Optional. This improves the accuracy and facilitates quantization.
	# 1. Cancel the original weight decay on rbr_dense.conv.weight and rbr_1x1.conv.weight.
	# 2. Use like this.
	# loss = criterion(....)
	# for every RepVGGBlock blk:
	# loss += weight_decay_coefficient * 0.5 * blk.get_cust_L2()
	# optimizer.zero_grad()
	# loss.backward()

	# Not used for OREPA
	def get_custom_L2(self):
	K3 = self.rbr_dense.weight_gen()
	K1 = self.rbr_1x1.conv.weight
	t3 = (self.rbr_dense.bn.weight / ((self.rbr_dense.bn.running_var + self.rbr_dense.bn.eps).sqrt())).reshape(-1, 1, 1, 1).detach()
	t1 = (self.rbr_1x1.bn.weight / ((self.rbr_1x1.bn.running_var + self.rbr_1x1.bn.eps).sqrt())).reshape(-1, 1, 1, 1).detach()

	l2_loss_circle = (K3 2).sum() - (K3[:, :, 1:2, 1:2] 2).sum() # The L2 loss of the "circle" of weights in 3x3 kernel. Use regular L2 on them.
	eq_kernel = K3[:, :, 1:2, 1:2] * t3 + K1 * t1 # The equivalent resultant central point of 3x3 kernel.
	l2_loss_eq_kernel = (eq_kernel 2 / (t3 2 + t1 ** 2)).sum() # Normalize for an L2 coefficient comparable to regular L2.
	return l2_loss_eq_kernel + l2_loss_circle

	def get_equivalent_kernel_bias(self):
	kernel3x3, bias3x3 = self._fuse_bn_tensor(self.rbr_dense)
	kernel1x1, bias1x1 = self._fuse_bn_tensor(self.rbr_1x1)
	kernelid, biasid = self._fuse_bn_tensor(self.rbr_identity)
	return kernel3x3 + self._pad_1x1_to_3x3_tensor(kernel1x1) + kernelid, bias3x3 + bias1x1 + biasid

	def _pad_1x1_to_3x3_tensor(self, kernel1x1):
	if kernel1x1 is None:
	return 0
	else:
	return torch.nn.functional.pad(kernel1x1, [1,1,1,1])

	def _fuse_bn_tensor(self, branch):
	if branch is None:
	return 0, 0
	if not isinstance(branch, nn.BatchNorm2d):
	if isinstance(branch, OREPA_3x3_RepConv):
	kernel = branch.weight_gen()
	elif isinstance(branch, ConvBN):
	kernel = branch.conv.weight
	else:
	raise NotImplementedError
	running_mean = branch.bn.running_mean
	running_var = branch.bn.running_var
	gamma = branch.bn.weight
	beta = branch.bn.bias
	eps = branch.bn.eps
	else:
	if not hasattr(self, 'id_tensor'):
	input_dim = self.in_channels // self.groups
	kernel_value = np.zeros((self.in_channels, input_dim, 3, 3), dtype=np.float32)
	for i in range(self.in_channels):
	kernel_value[i, i % input_dim, 1, 1] = 1
	self.id_tensor = torch.from_numpy(kernel_value).to(branch.weight.device)
	kernel = self.id_tensor
	running_mean = branch.running_mean
	running_var = branch.running_var
	gamma = branch.weight
	beta = branch.bias
	eps = branch.eps
	std = (running_var + eps).sqrt()
	t = (gamma / std).reshape(-1, 1, 1, 1)
	return kernel * t, beta - running_mean * gamma / std

	def switch_to_deploy(self):
	if hasattr(self, 'rbr_reparam'):
	return
	print(f"RepConv_OREPA.switch_to_deploy")
	kernel, bias = self.get_equivalent_kernel_bias()
	self.rbr_reparam = nn.Conv2d(in_channels=self.rbr_dense.in_channels, out_channels=self.rbr_dense.out_channels,
	kernel_size=self.rbr_dense.kernel_size, stride=self.rbr_dense.stride,
	padding=self.rbr_dense.padding, dilation=self.rbr_dense.dilation, groups=self.rbr_dense.groups, bias=True)
	self.rbr_reparam.weight.data = kernel
	self.rbr_reparam.bias.data = bias
	for para in self.parameters():
	para.detach_()
	self.__delattr__('rbr_dense')
	self.__delattr__('rbr_1x1')
	if hasattr(self, 'rbr_identity'):
	self.__delattr__('rbr_identity')

	##### end of orepa #####


	##### swin transformer #####

	class WindowAttention(nn.Module):

	def __init__(self, dim, window_size, num_heads, qkv_bias=True, qk_scale=None, attn_drop=0., proj_drop=0.):

	super().__init__()
	self.dim = dim
	self.window_size = window_size # Wh, Ww
	self.num_heads = num_heads
	head_dim = dim // num_heads
	self.scale = qk_scale or head_dim ** -0.5

	# define a parameter table of relative position bias
	self.relative_position_bias_table = nn.Parameter(
	torch.zeros((2 * window_size[0] - 1) * (2 * window_size[1] - 1), num_heads)) # 2Wh-1 2*Ww-1, nH

	# get pair-wise relative position index for each token inside the window
	coords_h = torch.arange(self.window_size[0])
	coords_w = torch.arange(self.window_size[1])
	coords = torch.stack(torch.meshgrid([coords_h, coords_w])) # 2, Wh, Ww
	coords_flatten = torch.flatten(coords, 1) # 2, Wh*Ww
	relative_coords = coords_flatten[:, :, None] - coords_flatten[:, None, :] # 2, WhWw, WhWw
	relative_coords = relative_coords.permute(1, 2, 0).contiguous() # WhWw, WhWw, 2
	relative_coords[:, :, 0] += self.window_size[0] - 1 # shift to start from 0
	relative_coords[:, :, 1] += self.window_size[1] - 1
	relative_coords[:, :, 0] = 2 self.window_size[1] - 1
	relative_position_index = relative_coords.sum(-1) # WhWw, WhWw
	self.register_buffer("relative_position_index", relative_position_index)

	self.qkv = nn.Linear(dim, dim * 3, bias=qkv_bias)
	self.attn_drop = nn.Dropout(attn_drop)
	self.proj = nn.Linear(dim, dim)
	self.proj_drop = nn.Dropout(proj_drop)

	nn.init.normal_(self.relative_position_bias_table, std=.02)
	self.softmax = nn.Softmax(dim=-1)

	def forward(self, x, mask=None):

	B_, N, C = x.shape
	qkv = self.qkv(x).reshape(B_, N, 3, self.num_heads, C // self.num_heads).permute(2, 0, 3, 1, 4)
	q, k, v = qkv[0], qkv[1], qkv[2] # make torchscript happy (cannot use tensor as tuple)

	q = q * self.scale
	attn = (q @ k.transpose(-2, -1))

	relative_position_bias = self.relative_position_bias_table[self.relative_position_index.view(-1)].view(
	self.window_size[0] * self.window_size[1], self.window_size[0] * self.window_size[1], -1) # WhWw,WhWw,nH
	relative_position_bias = relative_position_bias.permute(2, 0, 1).contiguous() # nH, WhWw, WhWw
	attn = attn + relative_position_bias.unsqueeze(0)

	if mask is not None:
	nW = mask.shape[0]
	attn = attn.view(B_ // nW, nW, self.num_heads, N, N) + mask.unsqueeze(1).unsqueeze(0)
	attn = attn.view(-1, self.num_heads, N, N)
	attn = self.softmax(attn)
	else:
	attn = self.softmax(attn)

	attn = self.attn_drop(attn)

	# print(attn.dtype, v.dtype)
	try:
	x = (attn @ v).transpose(1, 2).reshape(B_, N, C)
	except:
	#print(attn.dtype, v.dtype)
	x = (attn.half() @ v).transpose(1, 2).reshape(B_, N, C)
	x = self.proj(x)
	x = self.proj_drop(x)
	return x

	class Mlp(nn.Module):

	def __init__(self, in_features, hidden_features=None, out_features=None, act_layer=nn.SiLU, drop=0.):
	super().__init__()
	out_features = out_features or in_features
	hidden_features = hidden_features or in_features
	self.fc1 = nn.Linear(in_features, hidden_features)
	self.act = act_layer()
	self.fc2 = nn.Linear(hidden_features, out_features)
	self.drop = nn.Dropout(drop)

	def forward(self, x):
	x = self.fc1(x)
	x = self.act(x)
	x = self.drop(x)
	x = self.fc2(x)
	x = self.drop(x)
	return x

	def window_partition(x, window_size):

	B, H, W, C = x.shape
	assert H % window_size == 0, 'feature map h and w can not divide by window size'
	x = x.view(B, H // window_size, window_size, W // window_size, window_size, C)
	windows = x.permute(0, 1, 3, 2, 4, 5).contiguous().view(-1, window_size, window_size, C)
	return windows

	def window_reverse(windows, window_size, H, W):

	B = int(windows.shape[0] / (H * W / window_size / window_size))
	x = windows.view(B, H // window_size, W // window_size, window_size, window_size, -1)
	x = x.permute(0, 1, 3, 2, 4, 5).contiguous().view(B, H, W, -1)
	return x


	class SwinTransformerLayer(nn.Module):

	def __init__(self, dim, num_heads, window_size=8, shift_size=0,
	mlp_ratio=4., qkv_bias=True, qk_scale=None, drop=0., attn_drop=0., drop_path=0.,
	act_layer=nn.SiLU, norm_layer=nn.LayerNorm):
	super().__init__()
	self.dim = dim
	self.num_heads = num_heads
	self.window_size = window_size
	self.shift_size = shift_size
	self.mlp_ratio = mlp_ratio
	# if min(self.input_resolution) <= self.window_size:
	# # if window size is larger than input resolution, we don't partition windows
	# self.shift_size = 0
	# self.window_size = min(self.input_resolution)
	assert 0 <= self.shift_size < self.window_size, "shift_size must in 0-window_size"

	self.norm1 = norm_layer(dim)
	self.attn = WindowAttention(
	dim, window_size=(self.window_size, self.window_size), num_heads=num_heads,
	qkv_bias=qkv_bias, qk_scale=qk_scale, attn_drop=attn_drop, proj_drop=drop)

	self.drop_path = DropPath(drop_path) if drop_path > 0. else nn.Identity()
	self.norm2 = norm_layer(dim)
	mlp_hidden_dim = int(dim * mlp_ratio)
	self.mlp = Mlp(in_features=dim, hidden_features=mlp_hidden_dim, act_layer=act_layer, drop=drop)

	def create_mask(self, H, W):
	# calculate attention mask for SW-MSA
	img_mask = torch.zeros((1, H, W, 1)) # 1 H W 1
	h_slices = (slice(0, -self.window_size),
	slice(-self.window_size, -self.shift_size),
	slice(-self.shift_size, None))
	w_slices = (slice(0, -self.window_size),
	slice(-self.window_size, -self.shift_size),
	slice(-self.shift_size, None))
	cnt = 0
	for h in h_slices:
	for w in w_slices:
	img_mask[:, h, w, :] = cnt
	cnt += 1

	mask_windows = window_partition(img_mask, self.window_size) # nW, window_size, window_size, 1
	mask_windows = mask_windows.view(-1, self.window_size * self.window_size)
	attn_mask = mask_windows.unsqueeze(1) - mask_windows.unsqueeze(2)
	attn_mask = attn_mask.masked_fill(attn_mask != 0, float(-100.0)).masked_fill(attn_mask == 0, float(0.0))

	return attn_mask

	def forward(self, x):
	# reshape x[b c h w] to x[b l c]
	_, _, H_, W_ = x.shape

	Padding = False
	if min(H_, W_) < self.window_size or H_ % self.window_size!=0 or W_ % self.window_size!=0:
	Padding = True
	# print(f'img_size {min(H_, W_)} is less than (or not divided by) window_size {self.window_size}, Padding.')
	pad_r = (self.window_size - W_ % self.window_size) % self.window_size
	pad_b = (self.window_size - H_ % self.window_size) % self.window_size
	x = F.pad(x, (0, pad_r, 0, pad_b))

	# print('2', x.shape)
	B, C, H, W = x.shape
	L = H * W
	x = x.permute(0, 2, 3, 1).contiguous().view(B, L, C) # b, L, c

	# create mask from init to forward
	if self.shift_size > 0:
	attn_mask = self.create_mask(H, W).to(x.device)
	else:
	attn_mask = None

	shortcut = x
	x = self.norm1(x)
	x = x.view(B, H, W, C)

	# cyclic shift
	if self.shift_size > 0:
	shifted_x = torch.roll(x, shifts=(-self.shift_size, -self.shift_size), dims=(1, 2))
	else:
	shifted_x = x

	# partition windows
	x_windows = window_partition(shifted_x, self.window_size) # nW*B, window_size, window_size, C
	x_windows = x_windows.view(-1, self.window_size * self.window_size, C) # nWB, window_sizewindow_size, C

	# W-MSA/SW-MSA
	attn_windows = self.attn(x_windows, mask=attn_mask) # nWB, window_sizewindow_size, C

	# merge windows
	attn_windows = attn_windows.view(-1, self.window_size, self.window_size, C)
	shifted_x = window_reverse(attn_windows, self.window_size, H, W) # B H' W' C

	# reverse cyclic shift
	if self.shift_size > 0:
	x = torch.roll(shifted_x, shifts=(self.shift_size, self.shift_size), dims=(1, 2))
	else:
	x = shifted_x
	x = x.view(B, H * W, C)

	# FFN
	x = shortcut + self.drop_path(x)
	x = x + self.drop_path(self.mlp(self.norm2(x)))

	x = x.permute(0, 2, 1).contiguous().view(-1, C, H, W) # b c h w

	if Padding:
	x = x[:, :, :H_, :W_] # reverse padding

	return x


	class SwinTransformerBlock(nn.Module):
	def __init__(self, c1, c2, num_heads, num_layers, window_size=8):
	super().__init__()
	self.conv = None
	if c1 != c2:
	self.conv = Conv(c1, c2)

	# remove input_resolution
	self.blocks = nn.Sequential(*[SwinTransformerLayer(dim=c2, num_heads=num_heads, window_size=window_size,
	shift_size=0 if (i % 2 == 0) else window_size // 2) for i in range(num_layers)])

	def forward(self, x):
	if self.conv is not None:
	x = self.conv(x)
	x = self.blocks(x)
	return x


	class STCSPA(nn.Module):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super(STCSPA, self).__init__()
	c_ = int(c2 * e) # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c1, c_, 1, 1)
	self.cv3 = Conv(2 * c_, c2, 1, 1)
	num_heads = c_ // 32
	self.m = SwinTransformerBlock(c_, c_, num_heads, n)
	#self.m = nn.Sequential(*[Bottleneck(c_, c_, shortcut, g, e=1.0) for _ in range(n)])

	def forward(self, x):
	y1 = self.m(self.cv1(x))
	y2 = self.cv2(x)
	return self.cv3(torch.cat((y1, y2), dim=1))


	class STCSPB(nn.Module):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=False, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super(STCSPB, self).__init__()
	c_ = int(c2) # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c_, c_, 1, 1)
	self.cv3 = Conv(2 * c_, c2, 1, 1)
	num_heads = c_ // 32
	self.m = SwinTransformerBlock(c_, c_, num_heads, n)
	#self.m = nn.Sequential(*[Bottleneck(c_, c_, shortcut, g, e=1.0) for _ in range(n)])

	def forward(self, x):
	x1 = self.cv1(x)
	y1 = self.m(x1)
	y2 = self.cv2(x1)
	return self.cv3(torch.cat((y1, y2), dim=1))


	class STCSPC(nn.Module):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super(STCSPC, self).__init__()
	c_ = int(c2 * e) # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c1, c_, 1, 1)
	self.cv3 = Conv(c_, c_, 1, 1)
	self.cv4 = Conv(2 * c_, c2, 1, 1)
	num_heads = c_ // 32
	self.m = SwinTransformerBlock(c_, c_, num_heads, n)
	#self.m = nn.Sequential(*[Bottleneck(c_, c_, shortcut, g, e=1.0) for _ in range(n)])

	def forward(self, x):
	y1 = self.cv3(self.m(self.cv1(x)))
	y2 = self.cv2(x)
	return self.cv4(torch.cat((y1, y2), dim=1))

	##### end of swin transformer #####


	##### swin transformer v2 #####

	class WindowAttention_v2(nn.Module):

	def __init__(self, dim, window_size, num_heads, qkv_bias=True, attn_drop=0., proj_drop=0.,
	pretrained_window_size=[0, 0]):

	super().__init__()
	self.dim = dim
	self.window_size = window_size # Wh, Ww
	self.pretrained_window_size = pretrained_window_size
	self.num_heads = num_heads

	self.logit_scale = nn.Parameter(torch.log(10 * torch.ones((num_heads, 1, 1))), requires_grad=True)

	# mlp to generate continuous relative position bias
	self.cpb_mlp = nn.Sequential(nn.Linear(2, 512, bias=True),
	nn.ReLU(inplace=True),
	nn.Linear(512, num_heads, bias=False))

	# get relative_coords_table
	relative_coords_h = torch.arange(-(self.window_size[0] - 1), self.window_size[0], dtype=torch.float32)
	relative_coords_w = torch.arange(-(self.window_size[1] - 1), self.window_size[1], dtype=torch.float32)
	relative_coords_table = torch.stack(
	torch.meshgrid([relative_coords_h,
	relative_coords_w])).permute(1, 2, 0).contiguous().unsqueeze(0) # 1, 2Wh-1, 2Ww-1, 2
	if pretrained_window_size[0] > 0:
	relative_coords_table[:, :, :, 0] /= (pretrained_window_size[0] - 1)
	relative_coords_table[:, :, :, 1] /= (pretrained_window_size[1] - 1)
	else:
	relative_coords_table[:, :, :, 0] /= (self.window_size[0] - 1)
	relative_coords_table[:, :, :, 1] /= (self.window_size[1] - 1)
	relative_coords_table *= 8 # normalize to -8, 8
	relative_coords_table = torch.sign(relative_coords_table) * torch.log2(
	torch.abs(relative_coords_table) + 1.0) / np.log2(8)

	self.register_buffer("relative_coords_table", relative_coords_table)

	# get pair-wise relative position index for each token inside the window
	coords_h = torch.arange(self.window_size[0])
	coords_w = torch.arange(self.window_size[1])
	coords = torch.stack(torch.meshgrid([coords_h, coords_w])) # 2, Wh, Ww
	coords_flatten = torch.flatten(coords, 1) # 2, Wh*Ww
	relative_coords = coords_flatten[:, :, None] - coords_flatten[:, None, :] # 2, WhWw, WhWw
	relative_coords = relative_coords.permute(1, 2, 0).contiguous() # WhWw, WhWw, 2
	relative_coords[:, :, 0] += self.window_size[0] - 1 # shift to start from 0
	relative_coords[:, :, 1] += self.window_size[1] - 1
	relative_coords[:, :, 0] = 2 self.window_size[1] - 1
	relative_position_index = relative_coords.sum(-1) # WhWw, WhWw
	self.register_buffer("relative_position_index", relative_position_index)

	self.qkv = nn.Linear(dim, dim * 3, bias=False)
	if qkv_bias:
	self.q_bias = nn.Parameter(torch.zeros(dim))
	self.v_bias = nn.Parameter(torch.zeros(dim))
	else:
	self.q_bias = None
	self.v_bias = None
	self.attn_drop = nn.Dropout(attn_drop)
	self.proj = nn.Linear(dim, dim)
	self.proj_drop = nn.Dropout(proj_drop)
	self.softmax = nn.Softmax(dim=-1)

	def forward(self, x, mask=None):

	B_, N, C = x.shape
	qkv_bias = None
	if self.q_bias is not None:
	qkv_bias = torch.cat((self.q_bias, torch.zeros_like(self.v_bias, requires_grad=False), self.v_bias))
	qkv = F.linear(input=x, weight=self.qkv.weight, bias=qkv_bias)
	qkv = qkv.reshape(B_, N, 3, self.num_heads, -1).permute(2, 0, 3, 1, 4)
	q, k, v = qkv[0], qkv[1], qkv[2] # make torchscript happy (cannot use tensor as tuple)

	# cosine attention
	attn = (F.normalize(q, dim=-1) @ F.normalize(k, dim=-1).transpose(-2, -1))
	logit_scale = torch.clamp(self.logit_scale, max=torch.log(torch.tensor(1. / 0.01))).exp()
	attn = attn * logit_scale

	relative_position_bias_table = self.cpb_mlp(self.relative_coords_table).view(-1, self.num_heads)
	relative_position_bias = relative_position_bias_table[self.relative_position_index.view(-1)].view(
	self.window_size[0] * self.window_size[1], self.window_size[0] * self.window_size[1], -1) # WhWw,WhWw,nH
	relative_position_bias = relative_position_bias.permute(2, 0, 1).contiguous() # nH, WhWw, WhWw
	relative_position_bias = 16 * torch.sigmoid(relative_position_bias)
	attn = attn + relative_position_bias.unsqueeze(0)

	if mask is not None:
	nW = mask.shape[0]
	attn = attn.view(B_ // nW, nW, self.num_heads, N, N) + mask.unsqueeze(1).unsqueeze(0)
	attn = attn.view(-1, self.num_heads, N, N)
	attn = self.softmax(attn)
	else:
	attn = self.softmax(attn)

	attn = self.attn_drop(attn)

	try:
	x = (attn @ v).transpose(1, 2).reshape(B_, N, C)
	except:
	x = (attn.half() @ v).transpose(1, 2).reshape(B_, N, C)

	x = self.proj(x)
	x = self.proj_drop(x)
	return x

	def extra_repr(self) -> str:
	return f'dim={self.dim}, window_size={self.window_size}, ' \
	f'pretrained_window_size={self.pretrained_window_size}, num_heads={self.num_heads}'

	def flops(self, N):
	# calculate flops for 1 window with token length of N
	flops = 0
	# qkv = self.qkv(x)
	flops += N * self.dim * 3 * self.dim
	# attn = (q @ k.transpose(-2, -1))
	flops += self.num_heads * N * (self.dim // self.num_heads) * N
	# x = (attn @ v)
	flops += self.num_heads * N * N * (self.dim // self.num_heads)
	# x = self.proj(x)
	flops += N * self.dim * self.dim
	return flops

	class Mlp_v2(nn.Module):
	def __init__(self, in_features, hidden_features=None, out_features=None, act_layer=nn.SiLU, drop=0.):
	super().__init__()
	out_features = out_features or in_features
	hidden_features = hidden_features or in_features
	self.fc1 = nn.Linear(in_features, hidden_features)
	self.act = act_layer()
	self.fc2 = nn.Linear(hidden_features, out_features)
	self.drop = nn.Dropout(drop)

	def forward(self, x):
	x = self.fc1(x)
	x = self.act(x)
	x = self.drop(x)
	x = self.fc2(x)
	x = self.drop(x)
	return x


	def window_partition_v2(x, window_size):

	B, H, W, C = x.shape
	x = x.view(B, H // window_size, window_size, W // window_size, window_size, C)
	windows = x.permute(0, 1, 3, 2, 4, 5).contiguous().view(-1, window_size, window_size, C)
	return windows


	def window_reverse_v2(windows, window_size, H, W):

	B = int(windows.shape[0] / (H * W / window_size / window_size))
	x = windows.view(B, H // window_size, W // window_size, window_size, window_size, -1)
	x = x.permute(0, 1, 3, 2, 4, 5).contiguous().view(B, H, W, -1)
	return x


	class SwinTransformerLayer_v2(nn.Module):

	def __init__(self, dim, num_heads, window_size=7, shift_size=0,
	mlp_ratio=4., qkv_bias=True, drop=0., attn_drop=0., drop_path=0.,
	act_layer=nn.SiLU, norm_layer=nn.LayerNorm, pretrained_window_size=0):
	super().__init__()
	self.dim = dim
	#self.input_resolution = input_resolution
	self.num_heads = num_heads
	self.window_size = window_size
	self.shift_size = shift_size
	self.mlp_ratio = mlp_ratio
	#if min(self.input_resolution) <= self.window_size:
	# # if window size is larger than input resolution, we don't partition windows
	# self.shift_size = 0
	# self.window_size = min(self.input_resolution)
	assert 0 <= self.shift_size < self.window_size, "shift_size must in 0-window_size"

	self.norm1 = norm_layer(dim)
	self.attn = WindowAttention_v2(
	dim, window_size=(self.window_size, self.window_size), num_heads=num_heads,
	qkv_bias=qkv_bias, attn_drop=attn_drop, proj_drop=drop,
	pretrained_window_size=(pretrained_window_size, pretrained_window_size))

	self.drop_path = DropPath(drop_path) if drop_path > 0. else nn.Identity()
	self.norm2 = norm_layer(dim)
	mlp_hidden_dim = int(dim * mlp_ratio)
	self.mlp = Mlp_v2(in_features=dim, hidden_features=mlp_hidden_dim, act_layer=act_layer, drop=drop)

	def create_mask(self, H, W):
	# calculate attention mask for SW-MSA
	img_mask = torch.zeros((1, H, W, 1)) # 1 H W 1
	h_slices = (slice(0, -self.window_size),
	slice(-self.window_size, -self.shift_size),
	slice(-self.shift_size, None))
	w_slices = (slice(0, -self.window_size),
	slice(-self.window_size, -self.shift_size),
	slice(-self.shift_size, None))
	cnt = 0
	for h in h_slices:
	for w in w_slices:
	img_mask[:, h, w, :] = cnt
	cnt += 1

	mask_windows = window_partition(img_mask, self.window_size) # nW, window_size, window_size, 1
	mask_windows = mask_windows.view(-1, self.window_size * self.window_size)
	attn_mask = mask_windows.unsqueeze(1) - mask_windows.unsqueeze(2)
	attn_mask = attn_mask.masked_fill(attn_mask != 0, float(-100.0)).masked_fill(attn_mask == 0, float(0.0))

	return attn_mask

	def forward(self, x):
	# reshape x[b c h w] to x[b l c]
	_, _, H_, W_ = x.shape

	Padding = False
	if min(H_, W_) < self.window_size or H_ % self.window_size!=0 or W_ % self.window_size!=0:
	Padding = True
	# print(f'img_size {min(H_, W_)} is less than (or not divided by) window_size {self.window_size}, Padding.')
	pad_r = (self.window_size - W_ % self.window_size) % self.window_size
	pad_b = (self.window_size - H_ % self.window_size) % self.window_size
	x = F.pad(x, (0, pad_r, 0, pad_b))

	# print('2', x.shape)
	B, C, H, W = x.shape
	L = H * W
	x = x.permute(0, 2, 3, 1).contiguous().view(B, L, C) # b, L, c

	# create mask from init to forward
	if self.shift_size > 0:
	attn_mask = self.create_mask(H, W).to(x.device)
	else:
	attn_mask = None

	shortcut = x
	x = x.view(B, H, W, C)

	# cyclic shift
	if self.shift_size > 0:
	shifted_x = torch.roll(x, shifts=(-self.shift_size, -self.shift_size), dims=(1, 2))
	else:
	shifted_x = x

	# partition windows
	x_windows = window_partition_v2(shifted_x, self.window_size) # nW*B, window_size, window_size, C
	x_windows = x_windows.view(-1, self.window_size * self.window_size, C) # nWB, window_sizewindow_size, C

	# W-MSA/SW-MSA
	attn_windows = self.attn(x_windows, mask=attn_mask) # nWB, window_sizewindow_size, C

	# merge windows
	attn_windows = attn_windows.view(-1, self.window_size, self.window_size, C)
	shifted_x = window_reverse_v2(attn_windows, self.window_size, H, W) # B H' W' C

	# reverse cyclic shift
	if self.shift_size > 0:
	x = torch.roll(shifted_x, shifts=(self.shift_size, self.shift_size), dims=(1, 2))
	else:
	x = shifted_x
	x = x.view(B, H * W, C)
	x = shortcut + self.drop_path(self.norm1(x))

	# FFN
	x = x + self.drop_path(self.norm2(self.mlp(x)))
	x = x.permute(0, 2, 1).contiguous().view(-1, C, H, W) # b c h w

	if Padding:
	x = x[:, :, :H_, :W_] # reverse padding

	return x

	def extra_repr(self) -> str:
	return f"dim={self.dim}, input_resolution={self.input_resolution}, num_heads={self.num_heads}, " \
	f"window_size={self.window_size}, shift_size={self.shift_size}, mlp_ratio={self.mlp_ratio}"

	def flops(self):
	flops = 0
	H, W = self.input_resolution
	# norm1
	flops += self.dim * H * W
	# W-MSA/SW-MSA
	nW = H * W / self.window_size / self.window_size
	flops += nW * self.attn.flops(self.window_size * self.window_size)
	# mlp
	flops += 2 * H * W * self.dim * self.dim * self.mlp_ratio
	# norm2
	flops += self.dim * H * W
	return flops


	class SwinTransformer2Block(nn.Module):
	def __init__(self, c1, c2, num_heads, num_layers, window_size=7):
	super().__init__()
	self.conv = None
	if c1 != c2:
	self.conv = Conv(c1, c2)

	# remove input_resolution
	self.blocks = nn.Sequential(*[SwinTransformerLayer_v2(dim=c2, num_heads=num_heads, window_size=window_size,
	shift_size=0 if (i % 2 == 0) else window_size // 2) for i in range(num_layers)])

	def forward(self, x):
	if self.conv is not None:
	x = self.conv(x)
	x = self.blocks(x)
	return x


	class ST2CSPA(nn.Module):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super(ST2CSPA, self).__init__()
	c_ = int(c2 * e) # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c1, c_, 1, 1)
	self.cv3 = Conv(2 * c_, c2, 1, 1)
	num_heads = c_ // 32
	self.m = SwinTransformer2Block(c_, c_, num_heads, n)
	#self.m = nn.Sequential(*[Bottleneck(c_, c_, shortcut, g, e=1.0) for _ in range(n)])

	def forward(self, x):
	y1 = self.m(self.cv1(x))
	y2 = self.cv2(x)
	return self.cv3(torch.cat((y1, y2), dim=1))


	class ST2CSPB(nn.Module):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=False, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super(ST2CSPB, self).__init__()
	c_ = int(c2) # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c_, c_, 1, 1)
	self.cv3 = Conv(2 * c_, c2, 1, 1)
	num_heads = c_ // 32
	self.m = SwinTransformer2Block(c_, c_, num_heads, n)
	#self.m = nn.Sequential(*[Bottleneck(c_, c_, shortcut, g, e=1.0) for _ in range(n)])

	def forward(self, x):
	x1 = self.cv1(x)
	y1 = self.m(x1)
	y2 = self.cv2(x1)
	return self.cv3(torch.cat((y1, y2), dim=1))


	class ST2CSPC(nn.Module):
	# CSP Bottleneck https://github.com/WongKinYiu/CrossStagePartialNetworks
	def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5): # ch_in, ch_out, number, shortcut, groups, expansion
	super(ST2CSPC, self).__init__()
	c_ = int(c2 * e) # hidden channels
	self.cv1 = Conv(c1, c_, 1, 1)
	self.cv2 = Conv(c1, c_, 1, 1)
	self.cv3 = Conv(c_, c_, 1, 1)
	self.cv4 = Conv(2 * c_, c2, 1, 1)
	num_heads = c_ // 32
	self.m = SwinTransformer2Block(c_, c_, num_heads, n)
	#self.m = nn.Sequential(*[Bottleneck(c_, c_, shortcut, g, e=1.0) for _ in range(n)])

	def forward(self, x):
	y1 = self.cv3(self.m(self.cv1(x)))
	y2 = self.cv2(x)
	return self.cv4(torch.cat((y1, y2), dim=1))

	##### end of swin transformer v2 #####