added benchmark

benchmark/benchmark.py

+import time
+
+import torch
+from torch_spline_conv.functions.ffi import spline_basis_forward
+
+n, d = 9999999, 5
+pseudo = torch.FloatTensor(n, d).uniform_(0, 1)
+kernel_size = torch.LongTensor(d).fill_(5)
+is_open_spline = torch.ByteTensor(d).fill_(1)
+K = kernel_size.prod()
+
+t = time.perf_counter()
+basis, index = spline_basis_forward(1, pseudo, kernel_size, is_open_spline, K)
+t = time.perf_counter() - t
+print('CPU:', t)
+
+pseudo = pseudo.cuda()
+kernel_size = kernel_size.cuda()
+is_open_spline = is_open_spline.cuda()
+
+torch.cuda.synchronize()
+t = time.perf_counter()
+basis, index = spline_basis_forward(1, pseudo, kernel_size, is_open_spline, K)
+torch.cuda.synchronize()
+t = time.perf_counter() - t
+print('GPU:', t)