Create a .py file in the directory of DEIMv2, make sure all components are loaded successfully.

import torch.nn as nn
from huggingface_hub import PyTorchModelHubMixin

from engine.backbone import HGNetv2, DINOv3STAs
from engine.deim import HybridEncoder, LiteEncoder
from engine.deim import DFINETransformer, DEIMTransformer
from engine.deim.postprocessor import PostProcessor


class DEIMv2(nn.Module, PyTorchModelHubMixin):
    def __init__(self, config):
        super().__init__()
        self.backbone = DINOv3STAs(**config["DINOv3STAs"])
        self.encoder = HybridEncoder(**config["HybridEncoder"])
        self.decoder = DEIMTransformer(**config["DEIMTransformer"])
        self.postprocessor = PostProcessor(**config["PostProcessor"])

    def forward(self, x, orig_target_sizes):
        x = self.backbone(x)
        x = self.encoder(x)
        x = self.decoder(x)
        x = self.postprocessor(x, orig_target_sizes)

        return x

deimv2_s_config = {
  "DINOv3STAs": {
    ...
  },
  ...
}

deimv2_s_hf = DEIMv2.from_pretrained("Intellindust/DEIMv2_DINOv3_S_COCO")

Follow the steps below to prepare COCO dataset:

1. Download COCO2017 from OpenDataLab or COCO.

2. Modify paths in coco_detection.yml

   train_dataloader:
       img_folder: /data/COCO2017/train2017/
       ann_file: /data/COCO2017/annotations/instances_train2017.json
   val_dataloader:
       img_folder: /data/COCO2017/val2017/
       ann_file: /data/COCO2017/annotations/instances_val2017.json
   

To train on your custom dataset, you need to organize it in the COCO format. Follow the steps below to prepare your dataset:

1. Set remap_mscoco_category to False:

   This prevents the automatic remapping of category IDs to match the MSCOCO categories.

   remap_mscoco_category: False
   

2. Organize Images:

   Structure your dataset directories as follows:

   dataset/
   ├── images/
   │   ├── train/
   │   │   ├── image1.jpg
   │   │   ├── image2.jpg
   │   │   └── ...
   │   ├── val/
   │   │   ├── image1.jpg
   │   │   ├── image2.jpg
   │   │   └── ...
   └── annotations/
       ├── instances_train.json
       ├── instances_val.json
       └── ...
   

   • images/train/: Contains all training images.
   • images/val/: Contains all validation images.
   • annotations/: Contains COCO-formatted annotation files.

3. Convert Annotations to COCO Format:

   If your annotations are not already in COCO format, you'll need to convert them. You can use the following Python script as a reference or utilize existing tools:

   import json
   
   def convert_to_coco(input_annotations, output_annotations):
       # Implement conversion logic here
       pass
   
   if __name__ == "__main__":
       convert_to_coco('path/to/your_annotations.json', 'dataset/annotations/instances_train.json')
   

4. Update Configuration Files:

   Modify your custom_detection.yml.

   task: detection
   
   evaluator:
     type: CocoEvaluator
     iou_types: ['bbox', ]
   
   num_classes: 777 # your dataset classes
   remap_mscoco_category: False
   
   train_dataloader:
     type: DataLoader
     dataset:
       type: CocoDetection
       img_folder: /data/yourdataset/train
       ann_file: /data/yourdataset/train/train.json
       return_masks: False
       transforms:
         type: Compose
         ops: ~
     shuffle: True
     num_workers: 4
     drop_last: True
     collate_fn:
       type: BatchImageCollateFunction
   
   val_dataloader:
     type: DataLoader
     dataset:
       type: CocoDetection
       img_folder: /data/yourdataset/val
       ann_file: /data/yourdataset/val/ann.json
       return_masks: False
       transforms:
         type: Compose
         ops: ~
     shuffle: False
     num_workers: 4
     drop_last: False
     collate_fn:
       type: BatchImageCollateFunction
   

1. Training

   # for ViT-based variants
   CUDA_VISIBLE_DEVICES=0,1,2,3 torchrun --master_port=7777 --nproc_per_node=4 train.py -c configs/deimv2/deimv2_dinov3_${model}_coco.yml --use-amp --seed=0
   
   # for HGNetv2-based variants
   CUDA_VISIBLE_DEVICES=0,1,2,3 torchrun --master_port=7777 --nproc_per_node=4 train.py -c configs/deimv2/deimv2_hgnetv2_${model}_coco.yml --use-amp --seed=0
   

2. Testing

   # for ViT-based variants
   CUDA_VISIBLE_DEVICES=0,1,2,3 torchrun --master_port=7777 --nproc_per_node=4 train.py -c configs/deimv2/deimv2_dinov3_${model}_coco.yml --test-only -r model.pth
   
   # for HGNetv2-based variants
   CUDA_VISIBLE_DEVICES=0,1,2,3 torchrun --master_port=7777 --nproc_per_node=4 train.py -c configs/deimv2/deimv2_hgnetv2_${model}_coco.yml --test-only -r model.pth
   

3. Tuning

   # for ViT-based variants
   CUDA_VISIBLE_DEVICES=0,1,2,3 torchrun --master_port=7777 --nproc_per_node=4 train.py -c configs/deimv2/deimv2_dinov3_${model}_coco.yml --use-amp --seed=0 -t model.pth
   
   # for HGNetv2-based variants
   CUDA_VISIBLE_DEVICES=0,1,2,3 torchrun --master_port=7777 --nproc_per_node=4 train.py -c configs/deimv2/deimv2_hgnetv2_${model}_coco.yml --use-amp --seed=0 -t model.pth
   

For example, if you want to use DEIMv2-S and double the total batch size to 64 when training DEIMv2 on COCO2017, here are the steps you should follow:

1. Modify your deimv2_dinov3_s_coco.yml to increase the total_batch_size:

   train_dataloader:
     total_batch_size: 64 
     dataset: 
       transforms:
         ops:
           ...
   
     collate_fn:
       ...
   

2. Modify your deimv2_dinov3_s_coco.yml. Here’s how the key parameters should be adjusted:

   optimizer:
     type: AdamW
   
     params: 
       -
         # except norm/bn/bias in self.dinov3
         params: '^(?=.*.dinov3)(?!.*(?:norm|bn|bias)).*$'  
         lr: 0.00005  # doubled, linear scaling law
       -
         # including all norm/bn/bias in self.dinov3
         params: '^(?=.*.dinov3)(?=.*(?:norm|bn|bias)).*$'    
         lr: 0.00005   # doubled, linear scaling law
         weight_decay: 0.
       - 
         # including all norm/bn/bias except for the self.dinov3
         params: '^(?=.*(?:sta|encoder|decoder))(?=.*(?:norm|bn|bias)).*$'
         weight_decay: 0.
   
     lr: 0.0005   # linear scaling law if needed
     betas: [0.9, 0.999]
     weight_decay: 0.0001
   
   ema:  # added EMA settings
     decay: 0.9998  # adjusted by 1 - (1 - decay) * 2
     warmups: 500  # halved
   
   lr_warmup_scheduler:
     warmup_duration: 250  # halved
   

If you'd like to train DEIMv2-S on COCO2017 with an input size of 320x320, follow these steps:

1. Modify your deimv2_dinov3_s_coco.yml:

   eval_spatial_size: [320, 320]
   
   train_dataloader:
     # Here we set the total_batch_size to 64 as an example.
     total_batch_size: 64 
     dataset: 
       transforms:
         ops:
           #  Especially for Mosaic augmentation, it is recommended that output_size = input_size / 2.
           - {type: Mosaic, output_size: 160, rotation_range: 10, translation_range: [0.1, 0.1], scaling_range: [0.5, 1.5],
              probability: 1.0, fill_value: 0, use_cache: True, max_cached_images: 50, random_pop: True}
           ...
           - {type: Resize, size: [320, 320], }
           ...
       collate_fn:
         base_size: 320
         ...
   
   val_dataloader:
     dataset:
       transforms:
         ops:
           - {type: Resize, size: [320, 320], }
           ...
   

If you want to finetune DEIMv2-S for 20 epochs, follow these steps (for reference only; feel free to adjust them according to your needs):

epoches: 32 #  Total epochs: 20 for training + EMA  for 4n = 12. n refers to the model size in the matched config.

flat_epoch: 14    # 4 + 20 // 2
no_aug_epoch: 12  # 4n

train_dataloader:
  dataset: 
    transforms:
      ops:
        ...
      policy:
        epoch: [4, 14, 20]   # [start_epoch, flat_epoch, epoches - no_aug_epoch]

  collate_fn:
    ...
    mixup_epochs: [4, 14]  # [start_epoch, flat_epoch]
    stop_epoch: 20  # epoches - no_aug_epoch
    copyblend_epochs: [4, 20]  # [start_epoch, epoches - no_aug_epoch]
  
DEIMCriterion:
  matcher:
    ...
    matcher_change_epoch: 18  # ~90% of (epoches - no_aug_epoch)

1. Setup

   pip install onnx onnxsim
   

2. Export onnx

   python tools/deployment/export_onnx.py --check -c configs/deimv2/deimv2_dinov3_${model}_coco.yml -r model.pth
   

3. Export tensorrt

   trtexec --onnx="model.onnx" --saveEngine="model.engine" --fp16
   

⚠️ TensorRT Version Notes

• ✅ Recommended: Use TensorRT ≥ 10.6 for FP16 inference to ensure stable execution and correct detection results.

• ❗ Known Issue: With TensorRT 10.4, FP16 inference may produce incorrect outputs.

• 🔧 Workarounds for older versions (e.g., 10.4):

  • Run inference in FP32 mode, or

  • Carefully validate the exported engine and end-to-end pipeline to confirm numerical correctness and detection performance.

1. Setup

   pip install -r tools/inference/requirements.txt
   

2. Inference (onnxruntime / tensorrt / torch)

   Inference on images and videos is now supported.

   python tools/inference/onnx_inf.py --onnx model.onnx --input image.jpg  # video.mp4
   python tools/inference/trt_inf.py --trt model.engine --input image.jpg
   python tools/inference/torch_inf.py -c configs/deimv2/deimv2_dinov3_${model}_coco.yml -r model.pth --input image.jpg --device cuda:0
   

1. Setup

   pip install -r tools/benchmark/requirements.txt
   

2. Model FLOPs, MACs, and Params

   python tools/benchmark/get_info.py -c configs/deimv2/deimv2_dinov3_${model}_coco.yml
   

3. TensorRT Latency

   python tools/benchmark/trt_benchmark.py --COCO_dir path/to/COCO2017 --engine_dir model.engine
   

1. Setup

   pip install fiftyone
   

2. Voxel51 Fiftyone Visualization (fiftyone)

   python tools/visualization/fiftyone_vis.py -c configs/deimv2/deimv2_dinov3_${model}_coco.yml -r model.pth
   

1. Auto Resume Training

   bash reference/safe_training.sh
   

2. Converting Model Weights

   python reference/convert_weight.py model.pth