python - pytorch 耗尽 GPU 内存

Question

我正在尝试在 pytorch 中实现 Yolo-v2。但是，我似乎只是通过网络传递数据而耗尽了内存。该模型很大，如下所示。但是，我觉得我在用我的网络做一些愚蠢的事情(比如不在某处释放内存)。网络在 cpu 上按预期工作。

测试代码(内存用完的地方)是:

x = torch.rand(32,3,416, 416).cuda()
model = Yolov2().cuda()
y = model(x.float())

问题

1. 我的模型有什么明显的错误吗？
2. 如何利用内存提高效率？
3. 其他意见？

模型:

import torch
from torch import nn
import torch.nn.functional as F

class Yolov2(nn.Module):

    def __init__(self):
        super(Yolov2, self).__init__()

        self.conv1 = nn.Conv2d(in_channels=3, out_channels=32, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm1 = nn.BatchNorm2d(32)

        self.conv2 = nn.Conv2d(in_channels=32, out_channels=64, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm2 = nn.BatchNorm2d(64)

        self.conv3 = nn.Conv2d(in_channels=64, out_channels=128, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm3 = nn.BatchNorm2d(128)
        self.conv4 = nn.Conv2d(in_channels=128, out_channels=64, kernel_size=1, stride=1, padding=0, bias=False)
        self.batchnorm4 = nn.BatchNorm2d(64)
        self.conv5 = nn.Conv2d(in_channels=64, out_channels=128, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm5 = nn.BatchNorm2d(128)

        self.conv6 = nn.Conv2d(in_channels=128, out_channels=256, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm6 = nn.BatchNorm2d(256)
        self.conv7 = nn.Conv2d(in_channels=256, out_channels=128, kernel_size=1, stride=1, padding=0, bias=False)
        self.batchnorm7 = nn.BatchNorm2d(128)
        self.conv8 = nn.Conv2d(in_channels=128, out_channels=256, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm8 = nn.BatchNorm2d(256)

        self.conv9 = nn.Conv2d(in_channels=256, out_channels=512, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm9 = nn.BatchNorm2d(512)
        self.conv10 = nn.Conv2d(in_channels=512, out_channels=256, kernel_size=1, stride=1, padding=0, bias=False)
        self.batchnorm10 = nn.BatchNorm2d(256)
        self.conv11 = nn.Conv2d(in_channels=256, out_channels=512, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm11 = nn.BatchNorm2d(512)
        self.conv12 = nn.Conv2d(in_channels=512, out_channels=256, kernel_size=1, stride=1, padding=0, bias=False)
        self.batchnorm12 = nn.BatchNorm2d(256)
        self.conv13 = nn.Conv2d(in_channels=256, out_channels=512, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm13 = nn.BatchNorm2d(512)

        self.conv14 = nn.Conv2d(in_channels=512, out_channels=1024, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm14 = nn.BatchNorm2d(1024)
        self.conv15 = nn.Conv2d(in_channels=1024, out_channels=512, kernel_size=1, stride=1, padding=0, bias=False)
        self.batchnorm15 = nn.BatchNorm2d(512)
        self.conv16 = nn.Conv2d(in_channels=512, out_channels=1024, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm16 = nn.BatchNorm2d(1024)
        self.conv17 = nn.Conv2d(in_channels=1024, out_channels=512, kernel_size=1, stride=1, padding=0, bias=False)
        self.batchnorm17 = nn.BatchNorm2d(512)
        self.conv18 = nn.Conv2d(in_channels=512, out_channels=1024, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm18 = nn.BatchNorm2d(1024)

        self.conv19 = nn.Conv2d(in_channels=1024, out_channels=1024, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm19 = nn.BatchNorm2d(1024)
        self.conv20 = nn.Conv2d(in_channels=1024, out_channels=1024, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm20 = nn.BatchNorm2d(1024)

        self.conv21 = nn.Conv2d(in_channels=3072, out_channels=1024, kernel_size=3, stride=1, padding=1, bias=False)
        self.batchnorm21 = nn.BatchNorm2d(1024)

        self.conv22 = nn.Conv2d(in_channels=1024, out_channels=125, kernel_size=1, stride=1, padding=0)

    def reorg_layer(self, x):
        stride = 2
        batch_size, channels, height, width = x.size()
        new_ht = int(height/stride)
        new_wd = int(width/stride)
        new_channels = channels * stride * stride

#         from IPython.core.debugger import Tracer; Tracer()()
        passthrough = x.permute(0, 2, 3, 1)
        passthrough = passthrough.contiguous().view(-1, new_ht, stride, new_wd, stride, channels)
        passthrough = passthrough.permute(0, 1, 3, 2, 4, 5)
        passthrough = passthrough.contiguous().view(-1, new_ht, new_wd, new_channels)
        passthrough = passthrough.permute(0, 3, 1, 2)
        return passthrough

    def forward(self, x):
        out = F.max_pool2d(F.leaky_relu(self.batchnorm1(self.conv1(x)), negative_slope=0.1), 2, stride=2)
        out = F.max_pool2d(F.leaky_relu(self.batchnorm2(self.conv2(out)), negative_slope=0.1), 2, stride=2)

        out = F.leaky_relu(self.batchnorm3(self.conv3(out)), negative_slope=0.1)
        out = F.leaky_relu(self.batchnorm4(self.conv4(out)), negative_slope=0.1)
        out = F.leaky_relu(self.batchnorm5(self.conv5(out)), negative_slope=0.1)
        out = F.max_pool2d(out, 2, stride=2)

        out = F.leaky_relu(self.batchnorm6(self.conv6(out)), negative_slope=0.1)
        out = F.leaky_relu(self.batchnorm7(self.conv7(out)), negative_slope=0.1)
        out = F.leaky_relu(self.batchnorm8(self.conv8(out)), negative_slope=0.1)
        out = F.max_pool2d(out, 2, stride=2)

        out = F.leaky_relu(self.batchnorm9(self.conv9(out)), negative_slope=0.1)
        out = F.leaky_relu(self.batchnorm10(self.conv10(out)), negative_slope=0.1)
        out = F.leaky_relu(self.batchnorm11(self.conv11(out)), negative_slope=0.1)
        out = F.leaky_relu(self.batchnorm12(self.conv12(out)), negative_slope=0.1)
        out = F.leaky_relu(self.batchnorm13(self.conv13(out)), negative_slope=0.1)
#         from IPython.core.debugger import Tracer; Tracer()()
        passthrough = self.reorg_layer(out)
        out = F.max_pool2d(out, 2, stride=2)

        out = F.leaky_relu(self.batchnorm14(self.conv14(out)), negative_slope=0.1)
        out = F.leaky_relu(self.batchnorm15(self.conv15(out)), negative_slope=0.1)
        out = F.leaky_relu(self.batchnorm16(self.conv16(out)), negative_slope=0.1)
        out = F.leaky_relu(self.batchnorm17(self.conv17(out)), negative_slope=0.1)
        out = F.leaky_relu(self.batchnorm18(self.conv18(out)), negative_slope=0.1)

        out = F.leaky_relu(self.batchnorm19(self.conv19(out)), negative_slope=0.1)
        out = F.leaky_relu(self.batchnorm20(self.conv20(out)), negative_slope=0.1)

        out = torch.cat([passthrough, out], 1)
        out = F.leaky_relu(self.batchnorm21(self.conv21(out)), negative_slope=0.1)
        out = self.conv22(out)

        return out

附加信息:

• Torch 版本是 '0.4.1.post2'
• 在 aws p2.xlarge 上运行(限制 12GB GPU 内存)。
• 此模型的参数数量为 67137565。这将占用 <500MB。
• this thread from pytorch可能是相关的。

Answer 1

我会尝试使用较小的批量。从 1 开始，然后检查您的最大值是多少。我也可以尝试减少您的输入张量尺寸。你的网络对于你的 GPU 来说不是那么小