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SurfaceClassifier.py
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SurfaceClassifier.py
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'''
Description:
Email: hymath@mail.ustc.edu.cn
Date: 2020-10-07 15:20:12
LastEditTime: 2020-10-07 15:20:25
'''
import torch
import torch.nn as nn
import torch.nn.functional as F
class SurfaceClassifier(nn.Module):
def __init__(self, filter_channels, no_residual=False, last_op=nn.Sigmoid()):
super(SurfaceClassifier, self).__init__()
self.filters = []
# self.num_views = num_views
self.no_residual = no_residual
filter_channels = filter_channels
self.last_op = last_op
if self.no_residual:
for l in range(0, len(filter_channels) - 1):
self.filters.append(nn.Conv1d(
filter_channels[l],
filter_channels[l + 1],
1))
self.add_module("conv%d" % l, self.filters[l])
else:
for l in range(0, len(filter_channels) - 1):
if 0 != l:
self.filters.append(
nn.Conv1d(
filter_channels[l] + filter_channels[0],
filter_channels[l + 1],
1))
else:
self.filters.append(nn.Conv1d(
filter_channels[l],
filter_channels[l + 1],
1))
self.add_module("conv%d" % l, self.filters[l])
def _forward(self, feature, return_inter_var = False):
y = feature
tmpy = feature
num_filter = len(self.filters)
for i in range(num_filter):
if self.no_residual:
y = self._modules['conv' + str(i)](y)
else:
y = self._modules['conv' + str(i)](y if i == 0 else torch.cat([y, tmpy], 1))
if i != len(self.filters) - 1:
y = F.leaky_relu(y)
if return_inter_var and i == num_filter // 2:
return y
if self.last_op:
y = self.last_op(y)
return y
def forward(self, feature_1, feature_2 = None):
'''
:param feature: list of [BxC_inxHxW] tensors of image features
:param xy: [Bx3xN] tensor of (x,y) coodinates in the image plane
:return: [BxC_outxN] tensor of features extracted at the coordinates
'''
if feature_2 is None:
return self._forward(feature_1)
else:
inter_var1 = self._forward(feature_1, return_inter_var=True)
inter_var2 = self._forward(feature_2, return_inter_var=True)
y = torch.stack([inter_var1, inter_var2], dim=1).mean(dim=1)
tmpy = torch.stack([feature_1, feature_2], dim=1).mean(dim=1)
num_filter = len(self.filters)
inter_layer_index = 1 + num_filter // 2
for i in range(inter_layer_index, num_filter):
if self.no_residual:
y = self._modules['conv' + str(i)](y)
else:
y = self._modules['conv' + str(i)](y if i == 0 else torch.cat([y, tmpy], 1))
if i != len(self.filters) - 1:
y = F.leaky_relu(y)
if self.last_op:
y = self.last_op(y)
return y