Madras1/plantdoc-rtdetrv2-leaf-disease-detector

PlantDoc RT-DETRv2 Leaf Disease Detector

RT-DETRv2-R18 fine-tuned for object detection on an audited and cleaned version of the PlantDoc dataset.

The model detects leaf regions and assigns one of 27 plant or disease categories. It does not segment individual lesions and should not be interpreted as a clinically or agronomically validated diagnostic system.

Model details

• Architecture: RT-DETRv2 with an R18 backbone
• Base model: PekingU/rtdetr_v2_r18vd
• Framework: Hugging Face Transformers and PyTorch
• Input resolution: 640 x 640
• Number of classes: 27
• Total parameters: 20,106,556
• Best checkpoint: epoch 28
• Default inference threshold: 0.075

Dataset preparation

The source dataset was agyaatcoder/PlantDoc, originally containing 2,578 images in its train and test splits.

Before training, the dataset was audited for invalid boxes, incorrect image dimensions, exact duplicates, perceptual duplicates, conflicting labels and extremely rare classes.

Final frozen splits:

Split	Images	Boxes
Train	2,009	6,863
Validation	245	853
Test	247	966

All 27 retained classes occur in every split. Known exact and perceptual duplicate pairs between splits were removed.

The final split manifest and cleaning summary are included in this repository.

Results

The test split was evaluated once after model selection using only the validation split.

Metric	Validation	Test
mAP@[0.50:0.95]	0.279448	0.239394
mAP@0.50	—	0.336945
mAP@0.75	—	0.267526
mAP small	—	0.000000
mAP medium	—	0.140294
mAP large	—	0.260317
mAR@100	—	0.662587

Strongest test classes included:

Class	AP
Corn rust leaf	0.756111
grape leaf	0.565980
Apple leaf	0.468707
Strawberry leaf	0.406445
Squash Powdery mildew leaf	0.388265

Several tomato and potato disease classes obtained substantially lower AP. Complete per-class results are available in test_per_class_metrics.csv.

Training curves

Per-class test AP

Inference threshold

A global confidence threshold of 0.075 was selected exclusively on the validation split by maximizing detection F1 at IoU 0.50:

• Precision: 0.3299
• Recall: 0.4443
• F1: 0.3786

The threshold is intentionally permissive. For a cleaner visualization with fewer predictions, try values between 0.10 and 0.15. Application-specific threshold calibration is recommended.

Usage with Transformers pipeline

from PIL import Image
from transformers import pipeline

detector = pipeline(
    task="object-detection",
    model="Madras1/plantdoc-rtdetrv2-leaf-disease-detector",
)

image = Image.open("plant.jpg").convert("RGB")
predictions = detector(image, threshold=0.075)

for prediction in predictions:
    print(prediction)

Local inference script

python inference.py plant.jpg \
    --threshold 0.075 \
    --output prediction.png

The script automatically uses CUDA when available and otherwise runs on CPU.

Important limitations

• This is an experimental research model, not a production agricultural diagnostic system.
• Predictions must not be used alone to select pesticides, treatments or other crop-management interventions.
• PlantDoc contains watermarks, heterogeneous image sources, background biases and inconsistent annotation styles.
• Some images appear to have incomplete annotations. Plausible model detections may therefore be counted as false positives.
• Several visually similar disease classes remain difficult to distinguish.
• Performance on small objects was not established (test mAP small = 0).
• The global threshold may not be appropriate for every class or use case.
• Results should not be assumed to generalize to unseen farms, cameras, crop varieties, regions or lighting conditions.

Included files

• model.safetensors: trained model weights
• config.json: model architecture and class mapping
• preprocessor_config.json: image preprocessing configuration
• inference_config.json: recommended inference settings
• inference.py: local inference and visualization
• cleaning_summary.json: dataset-cleaning summary
• split_manifest.csv: frozen split manifest
• training_history.csv: epoch-level history
• test_metrics.json: aggregate test metrics
• test_per_class_metrics.csv: per-class test metrics
• statistical plots and threshold-analysis artifacts

Dataset photographs are not redistributed in this model repository.

Licenses and attribution

The base model PekingU/rtdetr_v2_r18vd is distributed under the Apache License 2.0.

The Hugging Face dataset agyaatcoder/PlantDoc declares the CC BY 4.0 license. Users of the source dataset must preserve its required attribution.

PlantDoc citation

@inproceedings{10.1145/3371158.3371196,
  author    = {Singh, Davinder and Jain, Naman and Jain, Pranjali and
               Kayal, Pratik and Kumawat, Sudhakar and Batra, Nipun},
  title     = {PlantDoc: A Dataset for Visual Plant Disease Detection},
  year      = {2020},
  publisher = {Association for Computing Machinery},
  doi       = {10.1145/3371158.3371196},
  booktitle = {Proceedings of the 7th ACM IKDD CoDS and
               25th COMAD},
  pages     = {249--253}
}