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Torch jit bug #147

@vodan37

Description

@vodan37

Can't use torch.jit.trace + torch.jit.script.
Error:
RuntimeError: Expected all tensors to be on the same device, but found at least two devices, cuda:0 and cpu!

Reproduce:

import torch
import torch.nn as nn
from fastervit import create_model

class FasterVit(nn.Module):
    def __init__(
        self,
        encoder_name="faster_vit_0_any_res",
        classes: int = 1,
        window_size=[7, 7, 12, 6],
        height = 512,
        width = 512,
        dim = 64,
        pretrained=True,
        **kwargs,
    ) -> None:
        super().__init__()
        self.model = create_model(
            encoder_name, 
            resolution=[height, width],
            window_size=window_size,
            ct_size=2,
            dim=dim,
            pretrained=pretrained,
        )

        self.model.head = nn.Linear(self.model.head.in_features, classes)

    def forward(self, x):
        return self.model(x)

model = FasterVit()

class MyModule(nn.Module):
    def __init__(
        self, 
        model,
        classes,
        # thresholds,
        height,
        width,
    ):
        super().__init__()
        self.classes = classes
        self.model = model.eval()
        self.classes = classes
        self.height = height
        self.width = width
        self.model = torch.jit.trace(self.model, torch.rand(1, 3, height, width))

    def forward(self, input):
        return self.model(input)

my_script_module = torch.jit.script(
    MyModule(
        model.to("cpu"),
        classes=["1", "2"],
        height=512,
        width=512,
    )
)

device = "cuda:0"

my_script_module.to(device)
example_input = torch.rand((1, 3, 512, 512)).to(device)
my_script_module(example_input)

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