Update README.md

README.md

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 Model and weights of paper [DeH4R: A Decoupled and Hybrid Method for Road Network Graph Extraction](https://arxiv.org/abs/2508.13669).
 
+The pth file contains model architecture and weights, so you should change the way of initializing model like 
+
+```python
+# model = R2RC(config) do not need this
+model = torch.load('xxx.pth')
+model.to(device)
+model.eval()
+```
+
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 license: mit
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