Following:
import torch.nn.functional as F
import torch
filters = torch.randint(0, 2, (8,4,3,3)).type(torch.CharTensor).cuda()
inputs  = torch.randint(0, 2, (1,4,5,5)).type(torch.CharTensor).cuda()
r = F.conv2d(inputs, filters, padding=1)
print(r)

Gives:
RuntimeError: getCudnnDataType() not supported for Char