Thanks, to be clear for future readers:
t1[torch.LongTensor([1,3,4])] works,   but t1[torch.LongTensor([1,3,4]), :] does not.
And one more question which is related: if I want to do indexing like:
t1[[1,3,0], [1,3,4]]
what is the most efficient way to do this in pytorch? In theano we can do it the same as in numpy, however pythorch does not support this yet.