bugs in main_pnp.py

[QsingHuan]

PnP-Depth/sparse-to-dense.pytorch/main_pnp.py

Line 254 in f3e20dd

ori_pred = model.pnp_forward_front(model.pnp_forward_rear(input)) # equivalent to `ori_pred = model(input)`

this should be
ori_pred = model.pnp_forward_rear(model.pnp_forward_front(input))
instead of the original one