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for e in range(10):
# define the loss value after the epoch
losss = 0.0
number_of_sub_epoch = 0
# loop for every training batch (one epoch)
for images, labels in train_loader:
#create the output from the network
out = modelpy(images)
# count the loss function
loss = criterion(out, labels)
# in pytorch you have assign the zero for gradien in any sub epoch
# count the backpropagation
# learning
# add new value to the main loss
losss += loss.item()
number_of_sub_epoch += 1
print("step {}: loss: {}".format(e, losss / number_of_sub_epoch))
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