Hi, I want to finetuning the pretrained inception v3 model, but get type mismatch error. the following is my code.
#!/usr/bin/env python3
import torch
import torch.nn as nn
import torch.optim as optim
from torchvision import models
import torchvision.transforms as transforms
from bcdataset import BloodCellDataset
import time
n_classes = 4
lr = 1e-3
batch_size = 32
epoches = 30
data_root_dir = '/home/chen/database/blood-cells/dataset2-master/dataset2-master/images/'
train_data = BloodCellDataset(
data_root_dir,
'./data/train.txt',
transform=transforms.Compose([
transforms.CenterCrop(240),
transforms.Resize([299, 299]), # inception v3 input size: 299x299x3
transforms.ToTensor(),
transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])
]))
trainloader = torch.utils.data.DataLoader(train_data, batch_size=batch_size,
shuffle=True, num_workers=2)
if __name__ == '__main__':
device = torch.device('cuda:0' if torch.cuda.is_available() else 'cpu')
model_iv3 = models.inception_v3(pretrained=True, transform_input=True)
for param in model_iv3.parameters():
param.requires_grad = False
n_features = model_iv3.fc.in_features
model_iv3.fc = nn.Linear(n_features, n_classes)
model_iv3.to(device)
criterion = nn.CrossEntropyLoss()
optimizer = optim.SGD(model_iv3.parameters(), lr=lr, momentum=0.9)
print('learning_rate: %f batch_size: %d' % (lr, batch_size))
print('training...')
for epoch in range(epoches):
model_iv3.train()
train_corrects = 0
train_loss = 0
with torch.set_grad_enabled(True):
for i, data in enumerate(trainloader, 0):
model_iv3.zero_grad()
images, labels = data
images.to(device)
labels.to(device)
outputs, _ = model_iv3(images)
_, preds = torch.max(outputs, 1)
# one-hot label
loss = criterion(outputs, labels)
loss.backward()
optimizer.step()
train_loss += loss
train_corrects += torch.sum(preds == labels)
the output:
learning_rate: 0.001000 batch_size: 32
training...
Traceback (most recent call last):
File "train_.py", line 56, in <module>
outputs, _ = model_iv3(images)
File "/home/chen/local/anaconda3/lib/python3.6/site-packages/torch/nn/modules/module.py", line 477, in __call__
result = self.forward(*input, **kwargs)
File "/home/chen/local/anaconda3/lib/python3.6/site-packages/torchvision-0.2.1-py3.6.egg/torchvision/models/inception.py", line 78, in forward
File "/home/chen/local/anaconda3/lib/python3.6/site-packages/torch/nn/modules/module.py", line 477, in __call__
result = self.forward(*input, **kwargs)
File "/home/chen/local/anaconda3/lib/python3.6/site-packages/torchvision-0.2.1-py3.6.egg/torchvision/models/inception.py", line 325, in forward
File "/home/chen/local/anaconda3/lib/python3.6/site-packages/torch/nn/modules/module.py", line 477, in __call__
result = self.forward(*input, **kwargs)
File "/home/chen/local/anaconda3/lib/python3.6/site-packages/torch/nn/modules/conv.py", line 301, in forward
self.padding, self.dilation, self.groups)
RuntimeError: Expected object of type torch.FloatTensor but found type torch.cuda.FloatTensor for argument #2 'weight'
i tried to modify model_iv3 to model_iv3.cuda() or add torch.set_default_tensor_type(‘torch.cuda.FloatTensor’), but it does not work. any idea?