some errors about knn_graph

[lookthatdog]

File "/opt/data/private/code/EDSR-PyTorch-master/src/model/net.py", line 107, in forward
edge_index = knn_graph(node, k)
File "/usr/local/anaconda3/envs/py36/lib/python3.6/site-packages/torch_cluster/knn.py", line 123, in knn_graph
row, col = knn(x, x, k if loop else k + 1, batch, batch, cosine=cosine)
File "/usr/local/anaconda3/envs/py36/lib/python3.6/site-packages/torch_cluster/knn.py", line 66, in knn
min_xy = min(x.min().item(), y.min().item())
RuntimeError: invalid argument 1: cannot perform reduction function min on tensor with no elements because the operation does not have an identity at /opt/conda/conda-bld/pytorch_1579027003190/work/aten/src/TH/generic/THTensorEvenMoreMath.cpp:345

[github-actions]

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