Rename sampler.py to neignbor_sampler.py

[ashishkrshrivastava]

I got the error "ImportError: cannot import name neighbor_sampler" , def neighbor_sampler is implemented in sampler.py

[rusty1s]

I do not see why this ImportError should happen. The __init__ file imports the neighbor_sampler from sampler.py, so both of the following commands should work:

from torch_cluster import neighbor_sampler
from torch_cluster.sampler import neighbor_sampler

[ashishkrshrivastava]

yeah, you are right, torch-cluster was not updated in my pc. its working fine now.