Lesson7-superres-gan.ipynb: fit_one_cycle()

Hi, when training the model with the function of fit_one_cycle(2, pct_start=0.8), it is too long to finish and there are such error message shown up(how to fix it):

"/usr/local/lib/python3.6/dist-packages/torch/nn/functional.py:2854: UserWarning: The default behavior for interpolate/upsample with float scale_factor will change in 1.6.0 to align with other frameworks/libraries, and use scale_factor directly, instead of relying on the computed output size. If you wish to keep the old behavior, please set recompute_scale_factor=True. See the documentation of nn.Upsample for details.
warnings.warn("The default behavior for interpolate/upsample with float scale_factor will change “)”

Best,
Bintao Li