pytorch教程网络和损失函数的可视化代码示例

1.效果

pytorch教程网络和损失函数的可视化代码示例_第1张图片

2.环境

1.pytorch
2.visdom
3.python3.5

3.用到的代码

# coding:utf8
import torch
from torch import nn, optim   # nn 神经网络模块 optim优化函数模块
from torch.utils.data import DataLoader
from torch.autograd import Variable
from torchvision import transforms, datasets
from visdom import Visdom  # 可视化处理模块
import time
import numpy as np
# 可视化app
viz = Visdom()
# 超参数
BATCH_SIZE = 40
LR = 1e-3
EPOCH = 2
# 判断是否使用gpu
USE_GPU = True
if USE_GPU:
    gpu_status = torch.cuda.is_available()
else:
    gpu_status = False
transform=transforms.Compose([transforms.ToTensor(),transforms.Normalize((0.1307,), (0.3081,))])
# 数据引入
train_dataset = datasets.MNIST('../data', True, transform, download=False)
test_dataset = datasets.MNIST('../data', False, transform)
train_loader = DataLoader(train_dataset, BATCH_SIZE, True)
# 为加快测试,把测试数据从10000缩小到2000
test_data = torch.unsqueeze(test_dataset.test_data, 1)[:1500]
test_label = test_dataset.test_labels[:1500]
# visdom可视化部分数据
viz.images(test_data[:100], nrow=10)
#viz.images(test_data[:100], nrow=10)
# 为防止可视化视窗重叠现象,停顿0.5秒
time.sleep(0.5)
if gpu_status:
    test_data = test_data.cuda()
test_data = Variable(test_data, volatile=True).float()
# 创建线图可视化窗口
line = viz.line(np.arange(10))
# 创建cnn神经网络
class CNN(nn.Module):
    def __init__(self, in_dim, n_class):
        super(CNN, self).__init__()
        self.conv = nn.Sequential(
            # channel 为信息高度 padding为图片留白 kernel_size 扫描模块size(5x5)
            nn.Conv2d(in_channels=in_dim, out_channels=16,kernel_size=5,stride=1, padding=2),
            nn.ReLU(),
            # 平面缩减 28x28 >> 14*14
            nn.MaxPool2d(kernel_size=2),
            nn.Conv2d(16, 32, 3, 1, 1),
            nn.ReLU(),
            # 14x14 >> 7x7
            nn.MaxPool2d(2)
        )
        self.fc = nn.Sequential(
            nn.Linear(32*7*7, 120),
            nn.Linear(120, n_class)
        )
    def forward(self, x):
        out = self.conv(x)
        out = out.view(out.size(0), -1)
        out = self.fc(out)
        return out
net = CNN(1,10)
if gpu_status :
    net = net.cuda()
    #print("#"*26, "使用gpu", "#"*26)
else:
    #print("#" * 26, "使用cpu", "#" * 26)
    pass
# loss、optimizer 函数设置
loss_f = nn.CrossEntropyLoss()
optimizer = optim.Adam(net.parameters(), lr=LR)
# 起始时间设置
start_time = time.time()
# 可视化所需数据点
time_p, tr_acc, ts_acc, loss_p = [], [], [], []
# 创建可视化数据视窗
text = viz.text("

convolution Nueral Network

") for epoch in range(EPOCH): # 由于分批次学习,输出loss为一批平均,需要累积or平均每个batch的loss,acc sum_loss, sum_acc, sum_step = 0., 0., 0. for i, (tx, ty) in enumerate(train_loader, 1): if gpu_status: tx, ty = tx.cuda(), ty.cuda() tx = Variable(tx) ty = Variable(ty) out = net(tx) loss = loss_f(out, ty) #print(tx.size()) #print(ty.size()) #print(out.size()) sum_loss += loss.item()*len(ty) #print(sum_loss) pred_tr = torch.max(out,1)[1] sum_acc += sum(pred_tr==ty).item() sum_step += ty.size(0) # 学习反馈 optimizer.zero_grad() loss.backward() optimizer.step() # 每40个batch可视化一下数据 if i % 40 == 0: if gpu_status: test_data = test_data.cuda() test_out = net(test_data) print(test_out.size()) # 如果用gpu运行out数据为cuda格式需要.cpu()转化为cpu数据 在进行比较 pred_ts = torch.max(test_out, 1)[1].cpu().data.squeeze() print(pred_ts.size()) rightnum = pred_ts.eq(test_label.view_as(pred_ts)).sum().item() #rightnum =sum(pred_tr==ty).item() # sum_acc += sum(pred_tr==ty).item() acc = rightnum/float(test_label.size(0)) print("epoch: [{}/{}] | Loss: {:.4f} | TR_acc: {:.4f} | TS_acc: {:.4f} | Time: {:.1f}".format(epoch+1, EPOCH, sum_loss/(sum_step), sum_acc/(sum_step), acc, time.time()-start_time)) # 可视化部分 time_p.append(time.time()-start_time) tr_acc.append(sum_acc/sum_step) ts_acc.append(acc) loss_p.append(sum_loss/sum_step) viz.line(X=np.column_stack((np.array(time_p), np.array(time_p), np.array(time_p))), Y=np.column_stack((np.array(loss_p), np.array(tr_acc), np.array(ts_acc))), win=line, opts=dict(legend=["Loss", "TRAIN_acc", "TEST_acc"])) # visdom text 支持html语句 viz.text("

epoch:{}


Loss:{:.4f}


" "

TRAIN_acc:{:.4f}


TEST_acc:{:.4f}


" "

Time:{:.2f}

".format(epoch, sum_loss/sum_step, sum_acc/sum_step, acc, time.time()-start_time), win=text) sum_loss, sum_acc, sum_step = 0., 0., 0.

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