# Using detr with custom backbone
**URL:**
**Author:**  [@paoloach](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Fu%2Fpaoloach)%5C
**Post date:** [February 18, 2024, 6:03pm UTC](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fusing-detr-with-custom-backbone%2F73724%2F1 "2024-02-18T18:03:30Z")
I would like to use detr model with a fine tunned resnet-50 backbone, but I can see how to configure it.
Somebody know how to do it ?
Thanks,
Paolo
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**Author:**  [@nielsr](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Fu%2Fnielsr)%5C
**Post date:** [February 21, 2024, 8:07am UTC](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fusing-detr-with-custom-backbone%2F73724%2F2 "2024-02-21T08:07:05Z")
Hi,
Yes this is now supported using the [AutoBackbone](https://huggingface.co/docs/transformers/v4.37.2/en/main_classes/backbones#transformers.AutoBackbone) class.
Here’s how to do that:
```python
from transformers import DetrConfig, DetrForObjectDetection
config = DetrConfig(backbone="microsoft/resnet50", use_pretrained_backbone=True)
model = DetrForObjectDetection(config)
```
Also, here’s how to randomly initialize a DETR model with a custom ResNet model:
```python
from transformers import DetrConfig, ResNetConfig, DetrForObjectDetection
backbone_config = ResNetConfig.from_pretrained("microsoft/resnet-50", out_indices=[0,1,2,3])
config = DetrConfig(backbone_config=backbone_config)
model = DetrForObjectDetection(config)
```
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**Author:**  [@paoloach](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Fu%2Fpaoloach)%5C
**Post date:** [February 21, 2024, 8:23am UTC](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fusing-detr-with-custom-backbone%2F73724%2F3 "2024-02-21T08:23:12Z")
Hi Niels,
thank you for your answer.
Paolo
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**Author:**  [@halyusuf](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Fu%2Fhalyusuf)%5C
**Post date:** [December 6, 2024, 12:13pm UTC](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fusing-detr-with-custom-backbone%2F73724%2F4 "2024-12-06T12:13:21Z")
this will load the pretrained backbone “microsoft/resnet-50” with randomly initialized encoder, decoder, and head of the transformer, am i right?
but what i’m trying to do, but i’m unable to do it is, i need to use a pretrained transformer, for exmaple: “microsoft/conditional-detr-resnet-50”, but i want to change the backbone to a fine tunned resnet backbone that i have the .pth or ckpt file for it