Questions about Detail Emphasis Module

[Shaw-Way]

Hi, thanks for your remarkable work. I have some questions about Detail Emphasis Module.

CADepth-master/networks/dem.py

Lines 4 to 19 in 8251f12

	class DEM(nn.Module):
	def __init__(self, channel):
	""" Detail Emphasis Module """
	super(DEM, self).__init__()
	self.conv1 = nn.Sequential(nn.ReflectionPad2d(1),
	nn.Conv2d(channel, channel, kernel_size=3, stride=1, padding=0),
	nn.BatchNorm2d(channel),
	nn.ReLU(True))
	self.global_path = nn.Sequential(nn.AdaptiveAvgPool2d(1),
	nn.Conv2d(channel, channel, kernel_size=1, stride=1, padding=0),
	nn.ReLU(True),
	nn.Conv2d(channel, channel, kernel_size=1, stride=1, padding=0),
	nn.Sigmoid())

I noticed that it contains 2 parts, the first is conv1, the second is global_path. It seems the second one is similar to Channel Attention Module. But I have no idea what is the function of the first part(conv1). May I ask how you conceived the first part or where it came from? Thanks in advance.