How to use Ignite with multiple output model / loss?

ignite
1

I have a model with multiple outputs. How to use multiple losses?

import torch.nn as nn

class NeuralNetwork(nn.Module):
  def __init__(self):
    super(NeuralNetwork, self).__init__()
    self.linear1 = nn.Linear(in_features = 3, out_features = 1)
    self.linear2 = nn.Linear(in_features = 3,out_features = 2)

  def forward(self, x):
    output1 = self.linear1(x)
    output2 = self.linear2(x)
    return output1, output2

output1 - CrossEntropyLoss, output2 - MSE

For one output it is easy:

criterion = nn.CrossEntropyLoss()
trainer = create_supervised_trainer(model, optimizer, criterion, device=device)
2

Try to use this, this will work

def forward(self, x):
out= self.linear1(x)
out = self.linear2(out)
return out

3

@odats please see these issues labelled as ‘question’:

HTH