Thank you for your response.
In theory, I have a 1D vector (tensor) of user embedding and a 1D vector item embedding. Then I want to make an outer product for these two 1D vectors to obtain a 2D matrix (considered as an image) - This matrix will be the input of CNN model.
I reshaped the user & item tensors because I see that torch.ger required 1D tensor input, i’m not sure it is my case or not