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car-detection-bayes
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add FeatureConcat() module

This commit is contained in:
Glenn Jocher 2020-04-05 14:47:41 -07:00
parent 968b2ec004
commit a657345b45
2 changed files with 13 additions and 17 deletions
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20
models.py
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@ -74,6 +74,7 @@ def create_modules(module_defs, img_size):
layers = mdef['layers']
filters = sum([output_filters[l + 1 if l > 0 else l] for l in layers])
routs.extend([i + l if l < 0 else l for l in layers])
modules = FeatureConcat(layers=layers)
elif mdef['type'] == 'shortcut': # nn.Sequential() placeholder for 'shortcut' layer
layers = mdef['from']
@ -234,27 +235,12 @@ class Darknet(nn.Module):
for i, (mdef, module) in enumerate(zip(self.module_defs, self.module_list)):
mtype = mdef['type']
if mtype == 'shortcut': # sum
if mtype in ['shortcut', 'route']: # sum, concat
if verbose:
l = [i - 1] + module.layers # layers
s = [list(x.shape)] + [list(out[i].shape) for i in module.layers] # shapes
str = ' >> ' + ' + '.join(['layer %g %s' % x for x in zip(l, s)])
x = module(x, out) # WeightedFeatureFusion()
elif mtype == 'route': # concat
layers = mdef['layers']
if verbose:
l = [i - 1] + layers # layers
s = [list(x.shape)] + [list(out[i].shape) for i in layers] # shapes
str = ' >> ' + ' + '.join(['layer %g %s' % x for x in zip(l, s)])
if len(layers) == 1:
x = out[layers[0]]
else:
try:
x = torch.cat([out[i] for i in layers], 1)
except: # apply stride 2 for darknet reorg layer
out[layers[1]] = F.interpolate(out[layers[1]], scale_factor=[0.5, 0.5])
x = torch.cat([out[i] for i in layers], 1)
# print(''), [print(out[i].shape) for i in layers], print(x.shape)
x = module(x, out) # WeightedFeatureFusion(), FeatureConcat()
elif mtype == 'yolo':
yolo_out.append(module(x, img_size, out))
else: # run module directly, i.e. mtype = 'convolutional', 'upsample', 'maxpool', 'batchnorm2d' etc.

10
utils/layers.py
View File

@ -3,6 +3,16 @@ import torch.nn.functional as F
from utils.utils import *
class FeatureConcat(nn.Module):
def __init__(self, layers):
super(FeatureConcat, self).__init__()
self.layers = layers # layer indices
self.multiple = len(layers) > 1 # multiple layers flag
def forward(self, x, outputs):
return torch.cat([outputs[i] for i in self.layers], 1) if self.multiple else outputs[self.layers[0]]
class WeightedFeatureFusion(nn.Module): # weighted sum of 2 or more layers https://arxiv.org/abs/1911.09070
def __init__(self, layers, weight=False):
super(WeightedFeatureFusion, self).__init__()