pytorch批训练batch pytorch 6 batch_train 批训练操作
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看代码吧~
import torch import torch.utils.data as Data torch.manual_seed(1) # reproducible # BATCH_SIZE = 5 BATCH_SIZE = 8 # 每次使用8个数据同时传入网路 x = torch.linspace(1, 10, 10) # this is x data (torch tensor) y = torch.linspace(10, 1, 10) # this is y data (torch tensor) torch_dataset = Data.TensorDataset(x, y) loader = Data.DataLoader( dataset=torch_dataset, # torch TensorDataset format batch_size=BATCH_SIZE, # mini batch size shuffle=False, # 设置不随机打乱数据 random shuffle for training num_workers=2, # 使用两个进程提取数据,subprocesses for loading data ) def show_batch(): for epoch in range(3): # 全部的数据使用3遍,train entire dataset 3 times for step, (batch_x, batch_y) in enumerate(loader): # for each training step # train your data... print('Epoch: ', epoch, '| Step: ', step, '| batch x: ', batch_x.numpy(), '| batch y: ', batch_y.numpy()) if __name__ == '__main__': show_batch()
BATCH_SIZE = 8 , 所有数据利用三次
Epoch: 0 | Step: 0 | batch x: [1. 2. 3. 4. 5. 6. 7. 8.] | batch y: [10. 9. 8. 7. 6. 5. 4. 3.] Epoch: 0 | Step: 1 | batch x: [ 9. 10.] | batch y: [2. 1.] Epoch: 1 | Step: 0 | batch x: [1. 2. 3. 4. 5. 6. 7. 8.] | batch y: [10. 9. 8. 7. 6. 5. 4. 3.] Epoch: 1 | Step: 1 | batch x: [ 9. 10.] | batch y: [2. 1.] Epoch: 2 | Step: 0 | batch x: [1. 2. 3. 4. 5. 6. 7. 8.] | batch y: [10. 9. 8. 7. 6. 5. 4. 3.] Epoch: 2 | Step: 1 | batch x: [ 9. 10.] | batch y: [2. 1.]
补充:pytorch批训练bug
问题描述:
在进行pytorch神经网络批训练的时候,有时会出现报错
TypeError: batch must contain tensors, numbers, dicts or lists; found <class 'torch.autograd.variable.Variable'>
解决办法:
第一步:
检查(重点!!!!!):
train_dataset = Data.TensorDataset(train_x, train_y)
train_x,和train_y格式,要求是tensor类,我第一次出错就是因为传入的是variable
可以这样将数据变为tensor类:
train_x = torch.FloatTensor(train_x)
第二步:
train_loader = Data.DataLoader( dataset=train_dataset, batch_size=batch_size, shuffle=True )
实例化一个DataLoader对象
第三步:
for epoch in range(epochs): for step, (batch_x, batch_y) in enumerate(train_loader): batch_x, batch_y = Variable(batch_x), Variable(batch_y)
这样就可以批训练了
需要注意的是:train_loader输出的是tensor,在训练网络时,需要变成Variable
以上为个人经验,希望能给大家一个参考,也希望大家多多支持。
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