import torch
import torch.nn as nn
import torch.nn.functional as F
x = torch.randn(3,2,5,6)
class Net(nn.Module):
def __init__(self):
super(Net,self).__init__()
self.conv1 = nn.Conv2d(1,6,3)
self.conv2 = nn.Conv2d(6,16,3)
self.fc1 = nn.Linear(16*6*6,120)
self.fc2 = nn.Linear(120,84)
self.fc3 = nn.Linear(84,10)
def forward(self, x):
x = F.max_pool2d(F.relu(self.conv1(x)),(2,2))
x = F.max_pool2d(F.relu(self.conv2(x)),2)
x = x.view(-1,self.num_flat_features(x))
x = F.relu(self.fc1(x))
x = F.relu(self.fc2(x))
x = self.fc3(x)
return x
def num_flat_features(self,x):
size = x.size()[1:]
num_features = 1
for s in size:
num_features *= s
return num_features
net = Net()
print(net)
params = list(net.parameters())
print(params)
print(len(params))
print(params[0].size())
input = torch.randn(1,1,32,32)
out = net(input)
print(out)
net.zero_grad()
target = torch.randn(10)
print(target)
print(target.size())
target = target.view(1,-1)
print(target)
criterion = nn.MSELoss()
net.zero_grad()
print(net.conv1.bias.grad)
loss = criterion(out,target)
loss.backward()
learning_rate = 0.01
for f in net.parameters():
f.data.sub_(f.grad.data * learning_rate)
import torch.optim as optim
optimizer = optim.SGD(net.parameters(),lr = 0.1)
optimizer.zero_grad()
output = net(input)
loss = criterion(output,target)
loss.backward()
optimizer.step()
print(target.size())
print(loss.grad_fn)
print(loss.grad_fn.next_functions)
print(loss.grad_fn.next_functions[0][0])
print(net.conv1.bias.grad)