[Apache TVM Discuss] [Questions] Relay failed to build models exported from pytorch

[Ligeng Zhu via Apache TVM Discuss]

Notice one very interesting one that might be helpful for this bug

I tried to compile the models exported from mxnet

```
from tvm import relay
import tvm
import numpy as np

import torch
import torch as th
import torch.nn as nn
from torchvision import models
import torch.onnx 

from tvm import relay, auto_scheduler
from tvm.relay import testing


mod, params = relay.testing.resnet.get_workload(
    num_layers=18, batch_size=1, image_shape=(3, 224, 224)
)

opt_level = 3
# target = tvm.target.cuda()
target = "llvm"
with tvm.transform.PassContext(opt_level=opt_level):
    lib = relay.build(mod, target=target, params=params)

print("build sucessful")
```

and it also raises the same segment fault error. However, if I comment all 
pytorch imports 

```
import torch
import torch as th
import torch.nn as nn
from torchvision import models
import torch.onnx 
```

then the `relay.build` works without problem. Any thoughts on the strange 
behavior?





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