def set_running_statistics(model, data_loader, distributed=False):
bn_mean = {}
bn_var = {}
forward_model = copy.deepcopy(model)
for name, m in forward_model.named_modules():
if isinstance(m, nn.BatchNorm2d):
if distributed:
bn_mean[name] = DistributedTensor(name + '#mean')
bn_var[name] = DistributedTensor(name + '#var')
else:
bn_mean[name] = AverageMeter()
bn_var[name] = AverageMeter()
def new_forward(bn, mean_est, var_est):
def lambda_forward(x):
batch_mean = x.mean(0, keepdim=True).mean(
2, keepdim=True).mean(3, keepdim=True) # 1, C, 1, 1
batch_var = (x - batch_mean) * (x - batch_mean)
batch_var = batch_var.mean(0, keepdim=True).mean(
2, keepdim=True).mean(3, keepdim=True)
batch_mean = torch.squeeze(batch_mean)
batch_var = torch.squeeze(batch_var)
mean_est.update(batch_mean.data, x.size(0))
var_est.update(batch_var.data, x.size(0))
# bn forward using calculated mean & var
_feature_dim = batch_mean.size(0)
return F.batch_norm(
x,
batch_mean,
batch_var,
bn.weight[:_feature_dim],
bn.bias[:_feature_dim],
False,
0.0,
bn.eps,
)
return lambda_forward
m.forward = new_forward(m, bn_mean[name], bn_var[name])
with torch.no_grad():
DynamicBatchNorm2d.SET_RUNNING_STATISTICS = True
for images in data_loader:
images = images['image'].to(get_net_device(forward_model))
forward_model(images)
DynamicBatchNorm2d.SET_RUNNING_STATISTICS = False
for name, m in model.named_modules():
if name in bn_mean and bn_mean[name].count > 0:
feature_dim = bn_mean[name].avg.size(0)
assert isinstance(m, nn.BatchNorm2d)
m.running_mean.data[:feature_dim].copy_(bn_mean[name].avg)
m.running_var.data[:feature_dim].copy_(bn_var[name].avg)
def get_active_subnet(self, in_channel, preserve_weight=True):
middle_channel = make_divisible(
round(in_channel * self.active_expand_ratio), 8)
# build the new layer
sub_layer = MBInvertedConvLayer(
in_channel,
self.active_out_channel,
self.active_kernel_size,
self.stride,
self.active_expand_ratio,
act_func=self.act_func,
mid_channels=middle_channel,
use_se=self.use_se,
)
sub_layer = sub_layer.to(get_net_device(self))
if not preserve_weight:
return sub_layer
# copy weight from current layer
if sub_layer.inverted_bottleneck is not None:
sub_layer.inverted_bottleneck.conv.weight.data.copy_(
self.inverted_bottleneck.conv.conv.weight.
data[:middle_channel, :in_channel, :, :])
copy_bn(sub_layer.inverted_bottleneck.bn,
self.inverted_bottleneck.bn.bn)
sub_layer.depth_conv.conv.weight.data.copy_(
self.depth_conv.conv.get_active_filter(
middle_channel, self.active_kernel_size).data)
copy_bn(sub_layer.depth_conv.bn, self.depth_conv.bn.bn)
if self.use_se:
se_mid = make_divisible(middle_channel // SEModule.REDUCTION,
divisor=8)
sub_layer.depth_conv.se.fc.reduce.weight.data.copy_(
self.depth_conv.se.fc.reduce.weight.
data[:se_mid, :middle_channel, :, :])
sub_layer.depth_conv.se.fc.reduce.bias.data.copy_(
self.depth_conv.se.fc.reduce.bias.data[:se_mid])
sub_layer.depth_conv.se.fc.expand.weight.data.copy_(
self.depth_conv.se.fc.expand.weight.
data[:middle_channel, :se_mid, :, :])
sub_layer.depth_conv.se.fc.expand.bias.data.copy_(
self.depth_conv.se.fc.expand.bias.data[:middle_channel])
sub_layer.point_linear.conv.weight.data.copy_(
self.point_linear.conv.conv.weight.
data[:self.active_out_channel, :middle_channel, :, :])
copy_bn(sub_layer.point_linear.bn, self.point_linear.bn.bn)
return sub_layer
def get_active_subnet(self, in_features, preserve_weight=True):
sub_layer = LinearLayer(in_features,
self.out_features,
self.bias,
dropout_rate=self.dropout_rate)
sub_layer = sub_layer.to(get_net_device(self))
if not preserve_weight:
return sub_layer
sub_layer.linear.weight.data.copy_(
self.linear.linear.weight.data[:self.out_features, :in_features])
if self.bias:
sub_layer.linear.bias.data.copy_(
self.linear.linear.bias.data[:self.out_features])
return sub_layer
def get_active_subnet(self, in_channel, preserve_weight=True):
sub_layer = ConvLayer(in_channel,
self.active_out_channel,
self.kernel_size,
self.stride,
self.dilation,
use_bn=self.use_bn,
act_func=self.act_func)
sub_layer = sub_layer.to(get_net_device(self))
if not preserve_weight:
return sub_layer
sub_layer.conv.weight.data.copy_(
self.conv.conv.weight.data[:self.
active_out_channel, :in_channel, :, :])
if self.use_bn:
copy_bn(sub_layer.bn, self.bn.bn)
return sub_layer