Why should v permute twice in the 6th triton tutorial(06-fused-attention)

[March-H]

v = v.permute(0, 1, 3, 2).contiguous() 
v = v.permute(0, 1, 3, 2)
v = v.to(torch.float8_e5m2)

in line 615 to 617.
Swap dim 2 and 3 twice and nothing change, right?