model organization for u2net

data_loader.py

@@ -0,0 +1,266 @@
+# data loader
+from __future__ import print_function, division
+import glob
+import torch
+from skimage import io, transform, color
+import numpy as np
+import random
+import math
+import matplotlib.pyplot as plt
+from torch.utils.data import Dataset, DataLoader
+from torchvision import transforms, utils
+from PIL import Image
+
+#==========================dataset load==========================
+class RescaleT(object):
+
+	def __init__(self,output_size):
+		assert isinstance(output_size,(int,tuple))
+		self.output_size = output_size
+
+	def __call__(self,sample):
+		imidx, image, label = sample['imidx'], sample['image'],sample['label']
+
+		h, w = image.shape[:2]
+
+		if isinstance(self.output_size,int):
+			if h > w:
+				new_h, new_w = self.output_size*h/w,self.output_size
+			else:
+				new_h, new_w = self.output_size,self.output_size*w/h
+		else:
+			new_h, new_w = self.output_size
+
+		new_h, new_w = int(new_h), int(new_w)
+
+		# #resize the image to new_h x new_w and convert image from range [0,255] to [0,1]
+		# img = transform.resize(image,(new_h,new_w),mode='constant')
+		# lbl = transform.resize(label,(new_h,new_w),mode='constant', order=0, preserve_range=True)
+
+		img = transform.resize(image,(self.output_size,self.output_size),mode='constant')
+		lbl = transform.resize(label,(self.output_size,self.output_size),mode='constant', order=0, preserve_range=True)
+
+		return {'imidx':imidx, 'image':img,'label':lbl}
+
+class Rescale(object):
+
+	def __init__(self,output_size):
+		assert isinstance(output_size,(int,tuple))
+		self.output_size = output_size
+
+	def __call__(self,sample):
+		imidx, image, label = sample['imidx'], sample['image'],sample['label']
+
+		if random.random() >= 0.5:
+			image = image[::-1]
+			label = label[::-1]
+
+		h, w = image.shape[:2]
+
+		if isinstance(self.output_size,int):
+			if h > w:
+				new_h, new_w = self.output_size*h/w,self.output_size
+			else:
+				new_h, new_w = self.output_size,self.output_size*w/h
+		else:
+			new_h, new_w = self.output_size
+
+		new_h, new_w = int(new_h), int(new_w)
+
+		# #resize the image to new_h x new_w and convert image from range [0,255] to [0,1]
+		img = transform.resize(image,(new_h,new_w),mode='constant')
+		lbl = transform.resize(label,(new_h,new_w),mode='constant', order=0, preserve_range=True)
+
+		return {'imidx':imidx, 'image':img,'label':lbl}
+
+class RandomCrop(object):
+
+	def __init__(self,output_size):
+		assert isinstance(output_size, (int, tuple))
+		if isinstance(output_size, int):
+			self.output_size = (output_size, output_size)
+		else:
+			assert len(output_size) == 2
+			self.output_size = output_size
+	def __call__(self,sample):
+		imidx, image, label = sample['imidx'], sample['image'], sample['label']
+
+		if random.random() >= 0.5:
+			image = image[::-1]
+			label = label[::-1]
+
+		h, w = image.shape[:2]
+		new_h, new_w = self.output_size
+
+		top = np.random.randint(0, h - new_h)
+		left = np.random.randint(0, w - new_w)
+
+		image = image[top: top + new_h, left: left + new_w]
+		label = label[top: top + new_h, left: left + new_w]
+
+		return {'imidx':imidx,'image':image, 'label':label}
+
+class ToTensor(object):
+	"""Convert ndarrays in sample to Tensors."""
+
+	def __call__(self, sample):
+
+		imidx, image, label = sample['imidx'], sample['image'], sample['label']
+
+		tmpImg = np.zeros((image.shape[0],image.shape[1],3))
+		tmpLbl = np.zeros(label.shape)
+
+		image = image/np.max(image)
+		if(np.max(label)<1e-6):
+			label = label
+		else:
+			label = label/np.max(label)
+
+		if image.shape[2]==1:
+			tmpImg[:,:,0] = (image[:,:,0]-0.485)/0.229
+			tmpImg[:,:,1] = (image[:,:,0]-0.485)/0.229
+			tmpImg[:,:,2] = (image[:,:,0]-0.485)/0.229
+		else:
+			tmpImg[:,:,0] = (image[:,:,0]-0.485)/0.229
+			tmpImg[:,:,1] = (image[:,:,1]-0.456)/0.224
+			tmpImg[:,:,2] = (image[:,:,2]-0.406)/0.225
+
+		tmpLbl[:,:,0] = label[:,:,0]
+
+
+		tmpImg = tmpImg.transpose((2, 0, 1))
+		tmpLbl = label.transpose((2, 0, 1))
+
+		return {'imidx':torch.from_numpy(imidx), 'image': torch.from_numpy(tmpImg), 'label': torch.from_numpy(tmpLbl)}
+
+class ToTensorLab(object):
+	"""Convert ndarrays in sample to Tensors."""
+	def __init__(self,flag=0):
+		self.flag = flag
+
+	def __call__(self, sample):
+
+		imidx, image, label =sample['imidx'], sample['image'], sample['label']
+
+		tmpLbl = np.zeros(label.shape)
+
+		if(np.max(label)<1e-6):
+			label = label
+		else:
+			label = label/np.max(label)
+
+		# change the color space
+		if self.flag == 2: # with rgb and Lab colors
+			tmpImg = np.zeros((image.shape[0],image.shape[1],6))
+			tmpImgt = np.zeros((image.shape[0],image.shape[1],3))
+			if image.shape[2]==1:
+				tmpImgt[:,:,0] = image[:,:,0]
+				tmpImgt[:,:,1] = image[:,:,0]
+				tmpImgt[:,:,2] = image[:,:,0]
+			else:
+				tmpImgt = image
+			tmpImgtl = color.rgb2lab(tmpImgt)
+
+			# nomalize image to range [0,1]
+			tmpImg[:,:,0] = (tmpImgt[:,:,0]-np.min(tmpImgt[:,:,0]))/(np.max(tmpImgt[:,:,0])-np.min(tmpImgt[:,:,0]))
+			tmpImg[:,:,1] = (tmpImgt[:,:,1]-np.min(tmpImgt[:,:,1]))/(np.max(tmpImgt[:,:,1])-np.min(tmpImgt[:,:,1]))
+			tmpImg[:,:,2] = (tmpImgt[:,:,2]-np.min(tmpImgt[:,:,2]))/(np.max(tmpImgt[:,:,2])-np.min(tmpImgt[:,:,2]))
+			tmpImg[:,:,3] = (tmpImgtl[:,:,0]-np.min(tmpImgtl[:,:,0]))/(np.max(tmpImgtl[:,:,0])-np.min(tmpImgtl[:,:,0]))
+			tmpImg[:,:,4] = (tmpImgtl[:,:,1]-np.min(tmpImgtl[:,:,1]))/(np.max(tmpImgtl[:,:,1])-np.min(tmpImgtl[:,:,1]))
+			tmpImg[:,:,5] = (tmpImgtl[:,:,2]-np.min(tmpImgtl[:,:,2]))/(np.max(tmpImgtl[:,:,2])-np.min(tmpImgtl[:,:,2]))
+
+			# tmpImg = tmpImg/(np.max(tmpImg)-np.min(tmpImg))
+
+			tmpImg[:,:,0] = (tmpImg[:,:,0]-np.mean(tmpImg[:,:,0]))/np.std(tmpImg[:,:,0])
+			tmpImg[:,:,1] = (tmpImg[:,:,1]-np.mean(tmpImg[:,:,1]))/np.std(tmpImg[:,:,1])
+			tmpImg[:,:,2] = (tmpImg[:,:,2]-np.mean(tmpImg[:,:,2]))/np.std(tmpImg[:,:,2])
+			tmpImg[:,:,3] = (tmpImg[:,:,3]-np.mean(tmpImg[:,:,3]))/np.std(tmpImg[:,:,3])
+			tmpImg[:,:,4] = (tmpImg[:,:,4]-np.mean(tmpImg[:,:,4]))/np.std(tmpImg[:,:,4])
+			tmpImg[:,:,5] = (tmpImg[:,:,5]-np.mean(tmpImg[:,:,5]))/np.std(tmpImg[:,:,5])
+
+		elif self.flag == 1: #with Lab color
+			tmpImg = np.zeros((image.shape[0],image.shape[1],3))
+
+			if image.shape[2]==1:
+				tmpImg[:,:,0] = image[:,:,0]
+				tmpImg[:,:,1] = image[:,:,0]
+				tmpImg[:,:,2] = image[:,:,0]
+			else:
+				tmpImg = image
+
+			tmpImg = color.rgb2lab(tmpImg)
+
+			# tmpImg = tmpImg/(np.max(tmpImg)-np.min(tmpImg))
+
+			tmpImg[:,:,0] = (tmpImg[:,:,0]-np.min(tmpImg[:,:,0]))/(np.max(tmpImg[:,:,0])-np.min(tmpImg[:,:,0]))
+			tmpImg[:,:,1] = (tmpImg[:,:,1]-np.min(tmpImg[:,:,1]))/(np.max(tmpImg[:,:,1])-np.min(tmpImg[:,:,1]))
+			tmpImg[:,:,2] = (tmpImg[:,:,2]-np.min(tmpImg[:,:,2]))/(np.max(tmpImg[:,:,2])-np.min(tmpImg[:,:,2]))
+
+			tmpImg[:,:,0] = (tmpImg[:,:,0]-np.mean(tmpImg[:,:,0]))/np.std(tmpImg[:,:,0])
+			tmpImg[:,:,1] = (tmpImg[:,:,1]-np.mean(tmpImg[:,:,1]))/np.std(tmpImg[:,:,1])
+			tmpImg[:,:,2] = (tmpImg[:,:,2]-np.mean(tmpImg[:,:,2]))/np.std(tmpImg[:,:,2])
+
+		else: # with rgb color
+			tmpImg = np.zeros((image.shape[0],image.shape[1],3))
+			image = image/np.max(image)
+			if image.shape[2]==1:
+				tmpImg[:,:,0] = (image[:,:,0]-0.485)/0.229
+				tmpImg[:,:,1] = (image[:,:,0]-0.485)/0.229
+				tmpImg[:,:,2] = (image[:,:,0]-0.485)/0.229
+			else:
+				tmpImg[:,:,0] = (image[:,:,0]-0.485)/0.229
+				tmpImg[:,:,1] = (image[:,:,1]-0.456)/0.224
+				tmpImg[:,:,2] = (image[:,:,2]-0.406)/0.225
+
+		tmpLbl[:,:,0] = label[:,:,0]
+
+
+		tmpImg = tmpImg.transpose((2, 0, 1))
+		tmpLbl = label.transpose((2, 0, 1))
+
+		return {'imidx':torch.from_numpy(imidx), 'image': torch.from_numpy(tmpImg), 'label': torch.from_numpy(tmpLbl)}
+
+class SalObjDataset(Dataset):
+	def __init__(self,img_name_list,lbl_name_list,transform=None):
+		# self.root_dir = root_dir
+		# self.image_name_list = glob.glob(image_dir+'*.png')
+		# self.label_name_list = glob.glob(label_dir+'*.png')
+		self.image_name_list = img_name_list
+		self.label_name_list = lbl_name_list
+		self.transform = transform
+
+	def __len__(self):
+		return len(self.image_name_list)
+
+	def __getitem__(self,idx):
+
+		# image = Image.open(self.image_name_list[idx])#io.imread(self.image_name_list[idx])
+		# label = Image.open(self.label_name_list[idx])#io.imread(self.label_name_list[idx])
+
+		image = io.imread(self.image_name_list[idx])
+		imname = self.image_name_list[idx]
+		imidx = np.array([idx])
+
+		if(0==len(self.label_name_list)):
+			label_3 = np.zeros(image.shape)
+		else:
+			label_3 = io.imread(self.label_name_list[idx])
+
+		label = np.zeros(label_3.shape[0:2])
+		if(3==len(label_3.shape)):
+			label = label_3[:,:,0]
+		elif(2==len(label_3.shape)):
+			label = label_3
+
+		if(3==len(image.shape) and 2==len(label.shape)):
+			label = label[:,:,np.newaxis]
+		elif(2==len(image.shape) and 2==len(label.shape)):
+			image = image[:,:,np.newaxis]
+			label = label[:,:,np.newaxis]
+
+		sample = {'imidx':imidx, 'image':image, 'label':label}
+
+		if self.transform:
+			sample = self.transform(sample)
+
+		return sample

u2net-notes.md

@@ -0,0 +1,4 @@
+# U2Net Saliency Model Notes
+
+- [U2Net](https://github.com/xuebinqin/U-2-Net)
+- [u2net.py](https://raw.githubusercontent.com/xuebinqin/U-2-Net/master/model/u2net.py)

u2net.py

@@ -0,0 +1,525 @@
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+
+class REBNCONV(nn.Module):
+    def __init__(self,in_ch=3,out_ch=3,dirate=1):
+        super(REBNCONV,self).__init__()
+
+        self.conv_s1 = nn.Conv2d(in_ch,out_ch,3,padding=1*dirate,dilation=1*dirate)
+        self.bn_s1 = nn.BatchNorm2d(out_ch)
+        self.relu_s1 = nn.ReLU(inplace=True)
+
+    def forward(self,x):
+
+        hx = x
+        xout = self.relu_s1(self.bn_s1(self.conv_s1(hx)))
+
+        return xout
+
+## upsample tensor 'src' to have the same spatial size with tensor 'tar'
+def _upsample_like(src,tar):
+
+    src = F.interpolate(src,size=tar.shape[2:],mode='bilinear')
+
+    return src
+
+
+### RSU-7 ###
+class RSU7(nn.Module):#UNet07DRES(nn.Module):
+
+    def __init__(self, in_ch=3, mid_ch=12, out_ch=3):
+        super(RSU7,self).__init__()
+
+        self.rebnconvin = REBNCONV(in_ch,out_ch,dirate=1)
+
+        self.rebnconv1 = REBNCONV(out_ch,mid_ch,dirate=1)
+        self.pool1 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.rebnconv2 = REBNCONV(mid_ch,mid_ch,dirate=1)
+        self.pool2 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.rebnconv3 = REBNCONV(mid_ch,mid_ch,dirate=1)
+        self.pool3 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.rebnconv4 = REBNCONV(mid_ch,mid_ch,dirate=1)
+        self.pool4 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.rebnconv5 = REBNCONV(mid_ch,mid_ch,dirate=1)
+        self.pool5 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.rebnconv6 = REBNCONV(mid_ch,mid_ch,dirate=1)
+
+        self.rebnconv7 = REBNCONV(mid_ch,mid_ch,dirate=2)
+
+        self.rebnconv6d = REBNCONV(mid_ch*2,mid_ch,dirate=1)
+        self.rebnconv5d = REBNCONV(mid_ch*2,mid_ch,dirate=1)
+        self.rebnconv4d = REBNCONV(mid_ch*2,mid_ch,dirate=1)
+        self.rebnconv3d = REBNCONV(mid_ch*2,mid_ch,dirate=1)
+        self.rebnconv2d = REBNCONV(mid_ch*2,mid_ch,dirate=1)
+        self.rebnconv1d = REBNCONV(mid_ch*2,out_ch,dirate=1)
+
+    def forward(self,x):
+
+        hx = x
+        hxin = self.rebnconvin(hx)
+
+        hx1 = self.rebnconv1(hxin)
+        hx = self.pool1(hx1)
+
+        hx2 = self.rebnconv2(hx)
+        hx = self.pool2(hx2)
+
+        hx3 = self.rebnconv3(hx)
+        hx = self.pool3(hx3)
+
+        hx4 = self.rebnconv4(hx)
+        hx = self.pool4(hx4)
+
+        hx5 = self.rebnconv5(hx)
+        hx = self.pool5(hx5)
+
+        hx6 = self.rebnconv6(hx)
+
+        hx7 = self.rebnconv7(hx6)
+
+        hx6d =  self.rebnconv6d(torch.cat((hx7,hx6),1))
+        hx6dup = _upsample_like(hx6d,hx5)
+
+        hx5d =  self.rebnconv5d(torch.cat((hx6dup,hx5),1))
+        hx5dup = _upsample_like(hx5d,hx4)
+
+        hx4d = self.rebnconv4d(torch.cat((hx5dup,hx4),1))
+        hx4dup = _upsample_like(hx4d,hx3)
+
+        hx3d = self.rebnconv3d(torch.cat((hx4dup,hx3),1))
+        hx3dup = _upsample_like(hx3d,hx2)
+
+        hx2d = self.rebnconv2d(torch.cat((hx3dup,hx2),1))
+        hx2dup = _upsample_like(hx2d,hx1)
+
+        hx1d = self.rebnconv1d(torch.cat((hx2dup,hx1),1))
+
+        return hx1d + hxin
+
+### RSU-6 ###
+class RSU6(nn.Module):#UNet06DRES(nn.Module):
+
+    def __init__(self, in_ch=3, mid_ch=12, out_ch=3):
+        super(RSU6,self).__init__()
+
+        self.rebnconvin = REBNCONV(in_ch,out_ch,dirate=1)
+
+        self.rebnconv1 = REBNCONV(out_ch,mid_ch,dirate=1)
+        self.pool1 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.rebnconv2 = REBNCONV(mid_ch,mid_ch,dirate=1)
+        self.pool2 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.rebnconv3 = REBNCONV(mid_ch,mid_ch,dirate=1)
+        self.pool3 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.rebnconv4 = REBNCONV(mid_ch,mid_ch,dirate=1)
+        self.pool4 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.rebnconv5 = REBNCONV(mid_ch,mid_ch,dirate=1)
+
+        self.rebnconv6 = REBNCONV(mid_ch,mid_ch,dirate=2)
+
+        self.rebnconv5d = REBNCONV(mid_ch*2,mid_ch,dirate=1)
+        self.rebnconv4d = REBNCONV(mid_ch*2,mid_ch,dirate=1)
+        self.rebnconv3d = REBNCONV(mid_ch*2,mid_ch,dirate=1)
+        self.rebnconv2d = REBNCONV(mid_ch*2,mid_ch,dirate=1)
+        self.rebnconv1d = REBNCONV(mid_ch*2,out_ch,dirate=1)
+
+    def forward(self,x):
+
+        hx = x
+
+        hxin = self.rebnconvin(hx)
+
+        hx1 = self.rebnconv1(hxin)
+        hx = self.pool1(hx1)
+
+        hx2 = self.rebnconv2(hx)
+        hx = self.pool2(hx2)
+
+        hx3 = self.rebnconv3(hx)
+        hx = self.pool3(hx3)
+
+        hx4 = self.rebnconv4(hx)
+        hx = self.pool4(hx4)
+
+        hx5 = self.rebnconv5(hx)
+
+        hx6 = self.rebnconv6(hx5)
+
+
+        hx5d =  self.rebnconv5d(torch.cat((hx6,hx5),1))
+        hx5dup = _upsample_like(hx5d,hx4)
+
+        hx4d = self.rebnconv4d(torch.cat((hx5dup,hx4),1))
+        hx4dup = _upsample_like(hx4d,hx3)
+
+        hx3d = self.rebnconv3d(torch.cat((hx4dup,hx3),1))
+        hx3dup = _upsample_like(hx3d,hx2)
+
+        hx2d = self.rebnconv2d(torch.cat((hx3dup,hx2),1))
+        hx2dup = _upsample_like(hx2d,hx1)
+
+        hx1d = self.rebnconv1d(torch.cat((hx2dup,hx1),1))
+
+        return hx1d + hxin
+
+### RSU-5 ###
+class RSU5(nn.Module):#UNet05DRES(nn.Module):
+
+    def __init__(self, in_ch=3, mid_ch=12, out_ch=3):
+        super(RSU5,self).__init__()
+
+        self.rebnconvin = REBNCONV(in_ch,out_ch,dirate=1)
+
+        self.rebnconv1 = REBNCONV(out_ch,mid_ch,dirate=1)
+        self.pool1 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.rebnconv2 = REBNCONV(mid_ch,mid_ch,dirate=1)
+        self.pool2 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.rebnconv3 = REBNCONV(mid_ch,mid_ch,dirate=1)
+        self.pool3 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.rebnconv4 = REBNCONV(mid_ch,mid_ch,dirate=1)
+
+        self.rebnconv5 = REBNCONV(mid_ch,mid_ch,dirate=2)
+
+        self.rebnconv4d = REBNCONV(mid_ch*2,mid_ch,dirate=1)
+        self.rebnconv3d = REBNCONV(mid_ch*2,mid_ch,dirate=1)
+        self.rebnconv2d = REBNCONV(mid_ch*2,mid_ch,dirate=1)
+        self.rebnconv1d = REBNCONV(mid_ch*2,out_ch,dirate=1)
+
+    def forward(self,x):
+
+        hx = x
+
+        hxin = self.rebnconvin(hx)
+
+        hx1 = self.rebnconv1(hxin)
+        hx = self.pool1(hx1)
+
+        hx2 = self.rebnconv2(hx)
+        hx = self.pool2(hx2)
+
+        hx3 = self.rebnconv3(hx)
+        hx = self.pool3(hx3)
+
+        hx4 = self.rebnconv4(hx)
+
+        hx5 = self.rebnconv5(hx4)
+
+        hx4d = self.rebnconv4d(torch.cat((hx5,hx4),1))
+        hx4dup = _upsample_like(hx4d,hx3)
+
+        hx3d = self.rebnconv3d(torch.cat((hx4dup,hx3),1))
+        hx3dup = _upsample_like(hx3d,hx2)
+
+        hx2d = self.rebnconv2d(torch.cat((hx3dup,hx2),1))
+        hx2dup = _upsample_like(hx2d,hx1)
+
+        hx1d = self.rebnconv1d(torch.cat((hx2dup,hx1),1))
+
+        return hx1d + hxin
+
+### RSU-4 ###
+class RSU4(nn.Module):#UNet04DRES(nn.Module):
+
+    def __init__(self, in_ch=3, mid_ch=12, out_ch=3):
+        super(RSU4,self).__init__()
+
+        self.rebnconvin = REBNCONV(in_ch,out_ch,dirate=1)
+
+        self.rebnconv1 = REBNCONV(out_ch,mid_ch,dirate=1)
+        self.pool1 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.rebnconv2 = REBNCONV(mid_ch,mid_ch,dirate=1)
+        self.pool2 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.rebnconv3 = REBNCONV(mid_ch,mid_ch,dirate=1)
+
+        self.rebnconv4 = REBNCONV(mid_ch,mid_ch,dirate=2)
+
+        self.rebnconv3d = REBNCONV(mid_ch*2,mid_ch,dirate=1)
+        self.rebnconv2d = REBNCONV(mid_ch*2,mid_ch,dirate=1)
+        self.rebnconv1d = REBNCONV(mid_ch*2,out_ch,dirate=1)
+
+    def forward(self,x):
+
+        hx = x
+
+        hxin = self.rebnconvin(hx)
+
+        hx1 = self.rebnconv1(hxin)
+        hx = self.pool1(hx1)
+
+        hx2 = self.rebnconv2(hx)
+        hx = self.pool2(hx2)
+
+        hx3 = self.rebnconv3(hx)
+
+        hx4 = self.rebnconv4(hx3)
+
+        hx3d = self.rebnconv3d(torch.cat((hx4,hx3),1))
+        hx3dup = _upsample_like(hx3d,hx2)
+
+        hx2d = self.rebnconv2d(torch.cat((hx3dup,hx2),1))
+        hx2dup = _upsample_like(hx2d,hx1)
+
+        hx1d = self.rebnconv1d(torch.cat((hx2dup,hx1),1))
+
+        return hx1d + hxin
+
+### RSU-4F ###
+class RSU4F(nn.Module):#UNet04FRES(nn.Module):
+
+    def __init__(self, in_ch=3, mid_ch=12, out_ch=3):
+        super(RSU4F,self).__init__()
+
+        self.rebnconvin = REBNCONV(in_ch,out_ch,dirate=1)
+
+        self.rebnconv1 = REBNCONV(out_ch,mid_ch,dirate=1)
+        self.rebnconv2 = REBNCONV(mid_ch,mid_ch,dirate=2)
+        self.rebnconv3 = REBNCONV(mid_ch,mid_ch,dirate=4)
+
+        self.rebnconv4 = REBNCONV(mid_ch,mid_ch,dirate=8)
+
+        self.rebnconv3d = REBNCONV(mid_ch*2,mid_ch,dirate=4)
+        self.rebnconv2d = REBNCONV(mid_ch*2,mid_ch,dirate=2)
+        self.rebnconv1d = REBNCONV(mid_ch*2,out_ch,dirate=1)
+
+    def forward(self,x):
+
+        hx = x
+
+        hxin = self.rebnconvin(hx)
+
+        hx1 = self.rebnconv1(hxin)
+        hx2 = self.rebnconv2(hx1)
+        hx3 = self.rebnconv3(hx2)
+
+        hx4 = self.rebnconv4(hx3)
+
+        hx3d = self.rebnconv3d(torch.cat((hx4,hx3),1))
+        hx2d = self.rebnconv2d(torch.cat((hx3d,hx2),1))
+        hx1d = self.rebnconv1d(torch.cat((hx2d,hx1),1))
+
+        return hx1d + hxin
+
+
+##### U^2-Net ####
+class U2NET(nn.Module):
+
+    def __init__(self,in_ch=3,out_ch=1):
+        super(U2NET,self).__init__()
+
+        self.stage1 = RSU7(in_ch,32,64)
+        self.pool12 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.stage2 = RSU6(64,32,128)
+        self.pool23 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.stage3 = RSU5(128,64,256)
+        self.pool34 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.stage4 = RSU4(256,128,512)
+        self.pool45 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.stage5 = RSU4F(512,256,512)
+        self.pool56 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.stage6 = RSU4F(512,256,512)
+
+        # decoder
+        self.stage5d = RSU4F(1024,256,512)
+        self.stage4d = RSU4(1024,128,256)
+        self.stage3d = RSU5(512,64,128)
+        self.stage2d = RSU6(256,32,64)
+        self.stage1d = RSU7(128,16,64)
+
+        self.side1 = nn.Conv2d(64,out_ch,3,padding=1)
+        self.side2 = nn.Conv2d(64,out_ch,3,padding=1)
+        self.side3 = nn.Conv2d(128,out_ch,3,padding=1)
+        self.side4 = nn.Conv2d(256,out_ch,3,padding=1)
+        self.side5 = nn.Conv2d(512,out_ch,3,padding=1)
+        self.side6 = nn.Conv2d(512,out_ch,3,padding=1)
+
+        self.outconv = nn.Conv2d(6*out_ch,out_ch,1)
+
+    def forward(self,x):
+
+        hx = x
+
+        #stage 1
+        hx1 = self.stage1(hx)
+        hx = self.pool12(hx1)
+
+        #stage 2
+        hx2 = self.stage2(hx)
+        hx = self.pool23(hx2)
+
+        #stage 3
+        hx3 = self.stage3(hx)
+        hx = self.pool34(hx3)
+
+        #stage 4
+        hx4 = self.stage4(hx)
+        hx = self.pool45(hx4)
+
+        #stage 5
+        hx5 = self.stage5(hx)
+        hx = self.pool56(hx5)
+
+        #stage 6
+        hx6 = self.stage6(hx)
+        hx6up = _upsample_like(hx6,hx5)
+
+        #-------------------- decoder --------------------
+        hx5d = self.stage5d(torch.cat((hx6up,hx5),1))
+        hx5dup = _upsample_like(hx5d,hx4)
+
+        hx4d = self.stage4d(torch.cat((hx5dup,hx4),1))
+        hx4dup = _upsample_like(hx4d,hx3)
+
+        hx3d = self.stage3d(torch.cat((hx4dup,hx3),1))
+        hx3dup = _upsample_like(hx3d,hx2)
+
+        hx2d = self.stage2d(torch.cat((hx3dup,hx2),1))
+        hx2dup = _upsample_like(hx2d,hx1)
+
+        hx1d = self.stage1d(torch.cat((hx2dup,hx1),1))
+
+
+        #side output
+        d1 = self.side1(hx1d)
+
+        d2 = self.side2(hx2d)
+        d2 = _upsample_like(d2,d1)
+
+        d3 = self.side3(hx3d)
+        d3 = _upsample_like(d3,d1)
+
+        d4 = self.side4(hx4d)
+        d4 = _upsample_like(d4,d1)
+
+        d5 = self.side5(hx5d)
+        d5 = _upsample_like(d5,d1)
+
+        d6 = self.side6(hx6)
+        d6 = _upsample_like(d6,d1)
+
+        d0 = self.outconv(torch.cat((d1,d2,d3,d4,d5,d6),1))
+
+        return torch.sigmoid(d0), torch.sigmoid(d1), torch.sigmoid(d2), torch.sigmoid(d3), torch.sigmoid(d4), torch.sigmoid(d5), torch.sigmoid(d6)
+
+### U^2-Net small ###
+class U2NETP(nn.Module):
+
+    def __init__(self,in_ch=3,out_ch=1):
+        super(U2NETP,self).__init__()
+
+        self.stage1 = RSU7(in_ch,16,64)
+        self.pool12 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.stage2 = RSU6(64,16,64)
+        self.pool23 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.stage3 = RSU5(64,16,64)
+        self.pool34 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.stage4 = RSU4(64,16,64)
+        self.pool45 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.stage5 = RSU4F(64,16,64)
+        self.pool56 = nn.MaxPool2d(2,stride=2,ceil_mode=True)
+
+        self.stage6 = RSU4F(64,16,64)
+
+        # decoder
+        self.stage5d = RSU4F(128,16,64)
+        self.stage4d = RSU4(128,16,64)
+        self.stage3d = RSU5(128,16,64)
+        self.stage2d = RSU6(128,16,64)
+        self.stage1d = RSU7(128,16,64)
+
+        self.side1 = nn.Conv2d(64,out_ch,3,padding=1)
+        self.side2 = nn.Conv2d(64,out_ch,3,padding=1)
+        self.side3 = nn.Conv2d(64,out_ch,3,padding=1)
+        self.side4 = nn.Conv2d(64,out_ch,3,padding=1)
+        self.side5 = nn.Conv2d(64,out_ch,3,padding=1)
+        self.side6 = nn.Conv2d(64,out_ch,3,padding=1)
+
+        self.outconv = nn.Conv2d(6*out_ch,out_ch,1)
+
+    def forward(self,x):
+
+        hx = x
+
+        #stage 1
+        hx1 = self.stage1(hx)
+        hx = self.pool12(hx1)
+
+        #stage 2
+        hx2 = self.stage2(hx)
+        hx = self.pool23(hx2)
+
+        #stage 3
+        hx3 = self.stage3(hx)
+        hx = self.pool34(hx3)
+
+        #stage 4
+        hx4 = self.stage4(hx)
+        hx = self.pool45(hx4)
+
+        #stage 5
+        hx5 = self.stage5(hx)
+        hx = self.pool56(hx5)
+
+        #stage 6
+        hx6 = self.stage6(hx)
+        hx6up = _upsample_like(hx6,hx5)
+
+        #decoder
+        hx5d = self.stage5d(torch.cat((hx6up,hx5),1))
+        hx5dup = _upsample_like(hx5d,hx4)
+
+        hx4d = self.stage4d(torch.cat((hx5dup,hx4),1))
+        hx4dup = _upsample_like(hx4d,hx3)
+
+        hx3d = self.stage3d(torch.cat((hx4dup,hx3),1))
+        hx3dup = _upsample_like(hx3d,hx2)
+
+        hx2d = self.stage2d(torch.cat((hx3dup,hx2),1))
+        hx2dup = _upsample_like(hx2d,hx1)
+
+        hx1d = self.stage1d(torch.cat((hx2dup,hx1),1))
+
+
+        #side output
+        d1 = self.side1(hx1d)
+
+        d2 = self.side2(hx2d)
+        d2 = _upsample_like(d2,d1)
+
+        d3 = self.side3(hx3d)
+        d3 = _upsample_like(d3,d1)
+
+        d4 = self.side4(hx4d)
+        d4 = _upsample_like(d4,d1)
+
+        d5 = self.side5(hx5d)
+        d5 = _upsample_like(d5,d1)
+
+        d6 = self.side6(hx6)
+        d6 = _upsample_like(d6,d1)
+
+        d0 = self.outconv(torch.cat((d1,d2,d3,d4,d5,d6),1))
+
+        return torch.sigmoid(d0), torch.sigmoid(d1), torch.sigmoid(d2), torch.sigmoid(d3), torch.sigmoid(d4), torch.sigmoid(d5), torch.sigmoid(d6)

u2net_inference.py

@@ -0,0 +1,96 @@
+import os
+from typing import Union
+from skimage import io, transform
+import torch
+import torchvision
+from torch.autograd import Variable
+import torch.nn as nn
+import torch.nn.functional as F
+from torch.utils.data import Dataset, DataLoader
+from torchvision import transforms#, utils
+# import torch.optim as optim
+
+import numpy as np
+from PIL import Image
+import glob
+
+from .data_loader import RescaleT
+from .data_loader import ToTensor
+from .data_loader import ToTensorLab
+from .data_loader import SalObjDataset
+
+from .u2net import U2NET # full size version 173.6 MB
+from .u2net import U2NETP # small version u2net 4.7 MB
+
+
+# normalize the predicted SOD probability map
+def normPRED(d):
+    ma = torch.max(d)
+    mi = torch.min(d)
+
+    dn = (d-mi)/(ma-mi)
+
+    return dn
+
+def save_output(image_name,pred,d_dir):
+
+    predict = pred
+    predict = predict.squeeze()
+    predict_np = predict.cpu().data.numpy()
+
+    im = Image.fromarray(predict_np*255).convert('RGB')
+    img_name = image_name.split(os.sep)[-1]
+    image = io.imread(image_name)
+    imo = im.resize((image.shape[1],image.shape[0]),resample=Image.BILINEAR)
+
+    pb_np = np.array(imo)
+
+    aaa = img_name.split(".")
+    bbb = aaa[0:-1]
+    imidx = bbb[0]
+    for i in range(1,len(bbb)):
+        imidx = imidx + "." + bbb[i]
+
+    imo.save(d_dir+imidx+'.png')
+
+
+def get_u2net_model():
+    model_pth = "/Users/reeteshmukul/me/model/saliency/u2net.pth"
+    net = U2NET(3,1)
+
+    device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")
+    net.load_state_dict(torch.load(model_pth, map_location=device))
+    net.eval()
+    
+    return net
+
+
+def get_saliency_mask(model, image_or_image_path : Union[str, np.array]):
+    
+    device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")
+
+    if isinstance(image_or_image_path, str):
+        image = io.imread(image_or_image_path)
+    else:
+        image = image_or_image_path
+    
+    transform = transforms.Compose([RescaleT(320), ToTensorLab(flag=0)])
+    sample = transform({
+        'imidx' : np.array([0]),
+        'image' : image, 
+        'label' : np.expand_dims(np.zeros(image.shape[:-1]), -1)
+    })
+
+    input_test = sample["image"].unsqueeze(0).type(torch.FloatTensor).to(device)
+    
+    d1,d2,d3,d4,d5,d6,d7= model(input_test)
+
+    pred = d1[:,0,:,:]
+    pred = normPRED(pred)
+
+    pred = pred.squeeze()
+    predict_np = pred.cpu().data.numpy()
+
+    im = Image.fromarray(predict_np * 255).convert("RGB")
+
+    return im