# Introduction This directory contains PyTorch YOLOv3 software and an iOS App developed by Ultralytics LLC, and **is freely available for redistribution under the GPL-3.0 license**. For more information please visit https://www.ultralytics.com. # Description The https://github.com/ultralytics/yolov3 repo contains inference and training code for YOLOv3 in PyTorch. The code works on Linux, MacOS and Windows. Training is done on the COCO dataset by default: https://cocodataset.org/#home. **Credit to Joseph Redmon for YOLO:** https://pjreddie.com/darknet/yolo/. # Requirements Python 3.7 or later with the following `pip3 install -U -r requirements.txt` packages: - `numpy` - `torch >= 1.1.0` - `opencv-python` - `tqdm` # Tutorials * [GCP Quickstart](https://github.com/ultralytics/yolov3/wiki/GCP-Quickstart) * [Transfer Learning](https://github.com/ultralytics/yolov3/wiki/Example:-Transfer-Learning) * [Train Single Image](https://github.com/ultralytics/yolov3/wiki/Example:-Train-Single-Image) * [Train Single Class](https://github.com/ultralytics/yolov3/wiki/Example:-Train-Single-Class) * [Train Custom Data](https://github.com/ultralytics/yolov3/wiki/Train-Custom-Data) # Jupyter Notebook Our Jupyter [notebook](https://colab.research.google.com/github/ultralytics/yolov3/blob/master/examples.ipynb) provides quick training, inference and testing examples. # Training **Start Training:** `python3 train.py` to begin training after downloading COCO data with `data/get_coco_dataset.sh`. Each epoch trains on 117,263 images from the train and validate COCO sets, and tests on 5000 images from the COCO validate set. **Resume Training:** `python3 train.py --resume` to resume training from `weights/last.pt`. **Plot Training:** `from utils import utils; utils.plot_results()` plots training results from `coco_16img.data`, `coco_64img.data`, 2 example datasets available in the `data/` folder, which train and test on the first 16 and 64 images of the COCO2014-trainval dataset.  ## Image Augmentation `datasets.py` applies random OpenCV-powered (https://opencv.org/) augmentation to the input images in accordance with the following specifications. Augmentation is applied **only** during training, not during inference. Bounding boxes are automatically tracked and updated with the images. 416 x 416 examples pictured below. Augmentation | Description --- | --- Translation | +/- 10% (vertical and horizontal) Rotation | +/- 5 degrees Shear | +/- 2 degrees (vertical and horizontal) Scale | +/- 10% Reflection | 50% probability (horizontal-only) H**S**V Saturation | +/- 50% HS**V** Intensity | +/- 50% ## Speed https://cloud.google.com/deep-learning-vm/ **Machine type:** n1-standard-8 (8 vCPUs, 30 GB memory) **CPU platform:** Intel Skylake **GPUs:** K80 ($0.20/hr), T4 ($0.35/hr), V100 ($0.83/hr) CUDA with [Nvidia Apex](https://github.com/NVIDIA/apex) FP16/32 **HDD:** 100 GB SSD **Dataset:** COCO train 2014 (117,263 images) GPUs | `batch_size` | images/sec | epoch time | epoch cost --- |---| --- | --- | --- K80 | 64 (32x2) | 11 | 175 min | $0.58 T4 | 64 (32x2) | 40 | 49 min | $0.29 T4 x2 | 64 (64x1) | 61 | 32 min | $0.36 V100 | 64 (32x2) | 115 | 17 min | $0.24 V100 x2 | 64 (64x1) | 150 | 13 min | $0.36 2080Ti | 64 (32x2) | 69 | 28 min | - # Inference `detect.py` runs inference on all images **and videos** in the `data/samples` folder: **YOLOv3:** `python3 detect.py --cfg cfg/yolov3.cfg --weights weights/yolov3.weights` **YOLOv3-tiny:** `python3 detect.py --cfg cfg/yolov3-tiny.cfg --weights weights/yolov3-tiny.weights` **YOLOv3-SPP:** `python3 detect.py --cfg cfg/yolov3-spp.cfg --weights weights/yolov3-spp.weights` ## Webcam `python3 detect.py --webcam` shows a live webcam feed. # Pretrained Weights - Darknet `*.weights` format: https://pjreddie.com/media/files/yolov3.weights - PyTorch `*.pt` format: https://drive.google.com/drive/folders/1uxgUBemJVw9wZsdpboYbzUN4bcRhsuAI ## Darknet Conversion ```bash git clone https://github.com/ultralytics/yolov3 && cd yolov3 # convert darknet cfg/weights to pytorch model python3 -c "from models import *; convert('cfg/yolov3-spp.cfg', 'weights/yolov3-spp.weights')" Success: converted 'weights/yolov3-spp.weights' to 'converted.pt' # convert cfg/pytorch model to darknet weights python3 -c "from models import *; convert('cfg/yolov3-spp.cfg', 'weights/yolov3-spp.pt')" Success: converted 'weights/yolov3-spp.pt' to 'converted.weights' ``` # mAP - `test.py --weights weights/yolov3.weights` tests official YOLOv3 weights. - `test.py --weights weights/last.pt` tests most recent checkpoint. - `test.py --weights weights/best.pt` tests best checkpoint. - Compare to darknet published results https://arxiv.org/abs/1804.02767. [ultralytics/yolov3](https://github.com/ultralytics/yolov3) mAP@0.5 ([darknet](https://arxiv.org/abs/1804.02767)-reported mAP@0.5) | 320 | 416 | 608 --- | --- | --- | --- `YOLOv3` | 51.8 (51.5) | 55.4 (55.3) | 58.2 (57.9) `YOLOv3-SPP` | 52.4 | 56.5 | 60.7 (60.6) `YOLOv3-tiny` | 29.0 | 32.9 (33.1) | 35.5 ``` bash # install pycocotools git clone https://github.com/cocodataset/cocoapi && cd cocoapi/PythonAPI && make && cd ../.. && cp -r cocoapi/PythonAPI/pycocotools yolov3 cd yolov3 python3 test.py --save-json --img-size 608 Namespace(batch_size=16, cfg='cfg/yolov3-spp.cfg', conf_thres=0.001, data='data/coco.data', img_size=608, iou_thres=0.5, nms_thres=0.5, save_json=True, weights='weights/yolov3-spp.weights') Using CUDA device0 _CudaDeviceProperties(name='Tesla T4', total_memory=15079MB) Class Images Targets P R mAP F1: 100% 313/313 [07:40<00:00, 2.34s/it] all 5e+03 3.58e+04 0.117 0.788 0.595 0.199 Average Precision (AP) @[ IoU=0.50:0.95 | area= all | maxDets=100 ] = 0.367 Average Precision (AP) @[ IoU=0.50 | area= all | maxDets=100 ] = 0.607 <-- Average Precision (AP) @[ IoU=0.75 | area= all | maxDets=100 ] = 0.387 Average Precision (AP) @[ IoU=0.50:0.95 | area= small | maxDets=100 ] = 0.208 Average Precision (AP) @[ IoU=0.50:0.95 | area=medium | maxDets=100 ] = 0.392 Average Precision (AP) @[ IoU=0.50:0.95 | area= large | maxDets=100 ] = 0.487 Average Recall (AR) @[ IoU=0.50:0.95 | area= all | maxDets= 1 ] = 0.297 Average Recall (AR) @[ IoU=0.50:0.95 | area= all | maxDets= 10 ] = 0.465 Average Recall (AR) @[ IoU=0.50:0.95 | area= all | maxDets=100 ] = 0.495 Average Recall (AR) @[ IoU=0.50:0.95 | area= small | maxDets=100 ] = 0.332 Average Recall (AR) @[ IoU=0.50:0.95 | area=medium | maxDets=100 ] = 0.518 Average Recall (AR) @[ IoU=0.50:0.95 | area= large | maxDets=100 ] = 0.621 python3 test.py --save-json --img-size 416 Namespace(batch_size=16, cfg='cfg/yolov3-spp.cfg', conf_thres=0.001, data='data/coco.data', img_size=416, iou_thres=0.5, nms_thres=0.5, save_json=True, weights='weights/yolov3-spp.weights') Using CUDA device0 _CudaDeviceProperties(name='Tesla T4', total_memory=15079MB) Class Images Targets P R mAP F1: 100% 313/313 [07:01<00:00, 1.41s/it] all 5e+03 3.58e+04 0.105 0.746 0.554 0.18 Average Precision (AP) @[ IoU=0.50:0.95 | area= all | maxDets=100 ] = 0.336 Average Precision (AP) @[ IoU=0.50 | area= all | maxDets=100 ] = 0.565 <-- Average Precision (AP) @[ IoU=0.75 | area= all | maxDets=100 ] = 0.350 Average Precision (AP) @[ IoU=0.50:0.95 | area= small | maxDets=100 ] = 0.151 Average Precision (AP) @[ IoU=0.50:0.95 | area=medium | maxDets=100 ] = 0.361 Average Precision (AP) @[ IoU=0.50:0.95 | area= large | maxDets=100 ] = 0.494 Average Recall (AR) @[ IoU=0.50:0.95 | area= all | maxDets= 1 ] = 0.281 Average Recall (AR) @[ IoU=0.50:0.95 | area= all | maxDets= 10 ] = 0.433 Average Recall (AR) @[ IoU=0.50:0.95 | area= all | maxDets=100 ] = 0.459 Average Recall (AR) @[ IoU=0.50:0.95 | area= small | maxDets=100 ] = 0.256 Average Recall (AR) @[ IoU=0.50:0.95 | area=medium | maxDets=100 ] = 0.495 Average Recall (AR) @[ IoU=0.50:0.95 | area= large | maxDets=100 ] = 0.622 ``` # Citation [](https://zenodo.org/badge/latestdoi/146165888) # Contact Issues should be raised directly in the repository. For additional questions or comments please email Glenn Jocher at glenn.jocher@ultralytics.com or visit us at https://contact.ultralytics.com.