Code corrupted silently when import decord before torch

This issue occurs when I import decord before torch, and then place nn.Module on the GPU.
```
import decord
import torch

torch.nn.Linear(3, 3).cuda()
```
It corrupted silently using `python3 debug.py`, and reported `Segmentation fault (core dumped)` when running in terminal.
Instead, the following code runs well,
```
import torch
import decord

torch.nn.Linear(3, 3).cuda()
```