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Unnecessary GPU memory usage in PyTorch Implementation

1

I noticed that in [`main_crnn.py`, line 167 ](https://github.com/js3611/Deep-MRI-Reconstruction/blob/master/main_crnn.py): `validate_err += err` as `err` is a Varaible on GPU, such usage will take extra GPU memory (with PyTorch 1.0.1), maybe you...