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ultralytics/cfg/default.yaml
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ultralytics/cfg/default.yaml
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# Ultralytics 🚀 AGPL-3.0 License - https://ultralytics.com/license
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# Global configuration YAML with settings and hyperparameters for YOLO training, validation, prediction and export
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# For documentation see https://docs.ultralytics.com/usage/cfg/
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task: detect # (str) YOLO task, i.e. detect, segment, classify, pose, obb
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mode: train # (str) YOLO mode, i.e. train, val, predict, export, track, benchmark
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# Train settings -------------------------------------------------------------------------------------------------------
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model: # (str, optional) path to model file, i.e. yolov8n.pt or yolov8n.yaml
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data: # (str, optional) path to data file, i.e. coco8.yaml
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epochs: 100 # (int) number of epochs to train for
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time: # (float, optional) max hours to train; overrides epochs if set
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patience: 100 # (int) early stop after N epochs without val improvement
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batch: 16 # (int) batch size; use -1 for AutoBatch
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imgsz: 640 # (int | list) train/val use int (square); predict/export may use [h,w]
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save: True # (bool) save train checkpoints and predict results
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save_period: -1 # (int) save checkpoint every N epochs; disabled if < 1
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cache: False # (bool | str) cache images in RAM (True/'ram') or on 'disk' to speed dataloading; False disables
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device: # (int | str | list) device: 0 or [0,1,2,3] for CUDA, 'cpu'/'mps', or -1/[-1,-1] to auto-select idle GPUs
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workers: 8 # (int) dataloader workers (per RANK if DDP)
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project: # (str, optional) project name for results root
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name: # (str, optional) experiment name; results in 'project/name'
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exist_ok: False # (bool) overwrite existing 'project/name' if True
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pretrained: True # (bool | str) use pretrained weights (bool) or load weights from path (str)
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optimizer: auto # (str) optimizer: SGD, Adam, Adamax, AdamW, NAdam, RAdam, RMSProp, or auto
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verbose: True # (bool) print verbose logs during training/val
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seed: 0 # (int) random seed for reproducibility
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deterministic: True # (bool) enable deterministic ops; reproducible but may be slower
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single_cls: False # (bool) treat all classes as a single class
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rect: False # (bool) rectangular batches for train; rectangular batching for val when mode='val'
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cos_lr: False # (bool) cosine learning rate scheduler
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close_mosaic: 10 # (int) disable mosaic augmentation for final N epochs (0 to keep enabled)
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resume: False # (bool) resume training from last checkpoint in the run dir
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amp: True # (bool) Automatic Mixed Precision (AMP) training; True runs AMP capability check
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fraction: 1.0 # (float) fraction of training dataset to use (1.0 = all)
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profile: False # (bool) profile ONNX/TensorRT speeds during training for loggers
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freeze: # (int | list, optional) freeze first N layers (int) or specific layer indices (list)
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multi_scale: False # (bool) multiscale training by varying image size
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compile: False # (bool | str) enable torch.compile() backend='inductor'; True="default", False=off, or "default|reduce-overhead|max-autotune-no-cudagraphs"
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# Segmentation
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overlap_mask: True # (bool) merge instance masks into one mask during training (segment only)
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mask_ratio: 4 # (int) mask downsample ratio (segment only)
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# Classification
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dropout: 0.0 # (float) dropout for classification head (classify only)
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# Val/Test settings ----------------------------------------------------------------------------------------------------
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val: True # (bool) run validation/testing during training
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split: val # (str) dataset split to evaluate: 'val', 'test' or 'train'
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save_json: False # (bool) save results to COCO JSON for external evaluation
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conf: # (float, optional) confidence threshold; defaults: predict=0.25, val=0.001
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iou: 0.7 # (float) IoU threshold used for NMS
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max_det: 300 # (int) maximum number of detections per image
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half: False # (bool) use half precision (FP16) if supported
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dnn: False # (bool) use OpenCV DNN for ONNX inference
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plots: True # (bool) save plots and images during train/val
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# Predict settings -----------------------------------------------------------------------------------------------------
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source: # (str, optional) path/dir/URL/stream for images or videos; e.g. 'ultralytics/assets' or '0' for webcam
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vid_stride: 1 # (int) read every Nth frame for video sources
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stream_buffer: False # (bool) True buffers all frames; False keeps the most recent frame for low-latency streams
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visualize: False # (bool) visualize model features (predict) or TP/FP/FN confusion (val)
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augment: False # (bool) apply test-time augmentation during prediction
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agnostic_nms: False # (bool) class-agnostic NMS
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classes: # (int | list[int], optional) filter by class id(s), e.g. 0 or [0,2,3]
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retina_masks: False # (bool) use high-resolution segmentation masks (segment)
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embed: # (list[int], optional) return feature embeddings from given layer indices
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# Visualize settings ---------------------------------------------------------------------------------------------------
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show: False # (bool) show images/videos in a window if supported
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save_frames: False # (bool) save individual frames from video predictions
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save_txt: False # (bool) save results as .txt files (xywh format)
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save_conf: False # (bool) save confidence scores with results
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save_crop: False # (bool) save cropped prediction regions to files
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show_labels: True # (bool) draw class labels on images, e.g. 'person'
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show_conf: True # (bool) draw confidence values on images, e.g. '0.99'
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show_boxes: True # (bool) draw bounding boxes on images
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line_width: # (int, optional) line width of boxes; auto-scales with image size if not set
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# Export settings ------------------------------------------------------------------------------------------------------
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format: torchscript # (str) target format, e.g. torchscript|onnx|openvino|engine|coreml|saved_model|pb|tflite|edgetpu|tfjs|paddle|mnn|ncnn|imx|rknn
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keras: False # (bool) TF SavedModel only (format=saved_model); enable Keras layers during export
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optimize: False # (bool) TorchScript only; apply mobile optimizations to the scripted model
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int8: False # (bool) INT8/PTQ where supported (openvino, tflite, tfjs, engine, imx); needs calibration data/fraction
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dynamic: False # (bool) dynamic shapes for torchscript, onnx, openvino, engine; enable variable image sizes
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simplify: True # (bool) ONNX/engine only; run graph simplifier for cleaner ONNX before runtime conversion
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opset: # (int, optional) ONNX/engine only; opset version for export; leave unset to use a tested default
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workspace: # (float, optional) engine (TensorRT) only; workspace size in GiB, e.g. 4
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nms: False # (bool) fuse NMS into exported model when backend supports; if True, conf/iou apply (agnostic_nms except coreml)
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# Hyperparameters ------------------------------------------------------------------------------------------------------
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lr0: 0.01 # (float) initial learning rate (SGD=1e-2, Adam/AdamW=1e-3)
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lrf: 0.01 # (float) final LR fraction; final LR = lr0 * lrf
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momentum: 0.937 # (float) SGD momentum or Adam beta1
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weight_decay: 0.0005 # (float) weight decay (L2 regularization)
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warmup_epochs: 3.0 # (float) warmup epochs (fractions allowed)
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warmup_momentum: 0.8 # (float) initial momentum during warmup
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warmup_bias_lr: 0.1 # (float) bias learning rate during warmup
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box: 7.5 # (float) box loss gain
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cls: 0.5 # (float) classification loss gain
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dfl: 1.5 # (float) distribution focal loss gain
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pose: 12.0 # (float) pose loss gain (pose tasks)
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kobj: 1.0 # (float) keypoint objectness loss gain (pose tasks)
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nbs: 64 # (int) nominal batch size used for loss normalization
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hsv_h: 0.015 # (float) HSV hue augmentation fraction
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hsv_s: 0.7 # (float) HSV saturation augmentation fraction
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hsv_v: 0.4 # (float) HSV value (brightness) augmentation fraction
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degrees: 0.0 # (float) rotation degrees (+/-)
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translate: 0.1 # (float) translation fraction (+/-)
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scale: 0.5 # (float) scale gain (+/-)
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shear: 0.0 # (float) shear degrees (+/-)
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perspective: 0.0 # (float) perspective fraction (0–0.001 typical)
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flipud: 0.0 # (float) vertical flip probability
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fliplr: 0.5 # (float) horizontal flip probability
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bgr: 0.0 # (float) RGB↔BGR channel swap probability
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mosaic: 1.0 # (float) mosaic augmentation probability
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mixup: 0.0 # (float) MixUp augmentation probability
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cutmix: 0.0 # (float) CutMix augmentation probability
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copy_paste: 0.0 # (float) segmentation copy-paste probability
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copy_paste_mode: flip # (str) copy-paste strategy for segmentation: flip or mixup
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auto_augment: randaugment # (str) classification auto augmentation policy: randaugment, autoaugment, augmix
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erasing: 0.4 # (float) random erasing probability for classification (0–0.9), <1.0
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# Custom config.yaml ---------------------------------------------------------------------------------------------------
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cfg: # (str, optional) path to a config.yaml that overrides defaults
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# Tracker settings ------------------------------------------------------------------------------------------------------
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tracker: botsort.yaml # (str) tracker config file: botsort.yaml or bytetrack.yaml
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