Yolov5 weights. yolov5-m which is a medium version.

Train Custom Data 🚀 RECOMMENDED; Tips for Best Training Results ☘️ RECOMMENDED; Weights & Biases Logging 🌟 NEW Nov 12, 2023 · 📚 This guide explains how to freeze YOLOv5 🚀 layers when transfer learning. 0 license """ Validate a trained YOLOv5 detection model on a detection dataset. Instead, part of the initial weights are frozen in place, and the rest of the weights are used to compute loss and are updated by the Nov 10, 2021 · The other method is directly change the class weight which is this thread mainly discussed. Oct 16, 2023 · $ yolov5 export--weights yolov5s. py runs YOLOv5 Classification inference on a variety of sources, downloading models automatically from the latest YOLOv5 release, and saving results to runs/predict-cls. py --weights yolov5s. Our new YOLOv5 v7. yaml, starting from pretrained --weights yolov5s. Recently, YOLOv5 extended support to the OpenCV DNN framework, which added the advantage of using this state-of-the-art object detection model – Yolov5 OpenCV DNN Module. 0 instance segmentation models are the fastest and most accurate in the world, beating all current SOTA benchmarks. labels, nc ). Yolov4 Yolov3 use raw darknet *. YOLOv5 is designed to be fast, accurate, and easy to use, making it an excellent choice for a wide range of object detection Nov 12, 2023 · 要加载YOLOv5 模型进行训练而不是推理,请设置 autoshape=False. Explore and run machine learning code with Kaggle Notebooks | Using data from multiple data sources Oct 11, 2020 · To achieve this, you can add a callback function to save the model's weights at the end of each epoch. cfg fils. yolov5-l which is a large version. load() method. yolov5-s which is a small version. Saved Keras model to model_data/yolo. py --img 640 --batch 16 --epochs 150 --data pollen_data. class_weights = labels_to_class_weights ( dataset. Luxonis OAK, web browser, NVIDIA Jetson). the height of the image will be adjusted accordingly, respecting the aspect ratio and stride needs. Weights & Biases; Visualize model metrics and predictions and upload models and datasets in realtime with Comet: Automatically compile and quantize YOLOv5 for better inference performance in one click at Deci: Automatically track, visualize and even remotely train YOLOv5 using ClearML (open-source!) weights: Pretrained weights you want to start training from. If you want to train from scratch, use --weights ' ' name: Various things about training such as train logs. はじめに. Nov 18, 2020 · @lewisMurch see YOLOv5 PyTorch Hub tutorial for correct commands: YOLOv5 Tutorials. Ultralytics YOLOv5 🚀 is a cutting-edge, state-of-the-art (SOTA) model that builds upon the success of previous YOLO versions and introduces new features and improvements to further boost performance and flexibility. We've made them super simple to train, validate and deploy. May 11, 2022 · You RUN YOLO's detect. Reload to refresh your session. pt --include torchscript onnx openvino engine Trained with Synthetic Fruit dataset (5000 training, 1000 validation images) Tested Model Hyperparameters: Epochs->50, Batch Size->1 (CUDA OOM Issues). img2label_paths = custom_img2label_paths. You should provide your path parameter as a either string or os. pyとdetect. (These are written in the docs). Mar 27, 2022 · !python train. To upload model weights, use the following Nov 23, 2020 · If this badge is green, all YOLOv5 GitHub Actions Continuous Integration (CI) tests are currently passing. load ( 'ultralytics/yolov5', 'yolov5s' ) Dec 22, 2021 · Search before asking I have searched the YOLOv5 issues and discussions and found no similar questions. 0 license. pt and yolov5x. Weights & Biases. png, best. Let's say. The detections generated by YOLOv5, a family of object detection architectures and models pretrained on the COCO dataset, are passed to a Deep Sort algorithm which tracks the objects. jpg -thresh 0. Which produces: To load a pretrained YOLOv5s model with 10 output classes rather than the default 80: model=torch. 运行命令 python export. answered Nov 26, 2022 at 8:09. pt --data coco128. pt --source image. If none of these apply to you, we suggest you close this issue and raise a new one using the Bug Report template , providing screenshots and minimum viable code to reproduce your issue . py such as: python train. To do so we will take the following steps: Gather a dataset of images and label our dataset. 喻:挽力竭windows两续玄屯冷。. yaml. YOLOv5可以使用ensemble testing提升測試結果 7. 要为模型加载随机初始化的权重(从头开始训练),请使用 pretrained=False. torchscript inputshape=[1,3,640,640] 得到了yolov5s. instead of passing pre-trained weight, pass it as empty. yolov5/train. For example, to display all detection you can set the threshold to 0: . YOLOv5 🚀 in PyTorch > ONNX > CoreML > TFLite. weights data/dog. Attempting to cast down to INT32. Example inputs: weights=[a,b,c] or a single model weights=[a] or weights=a. 怜王“玖”菠蛤. jpg # image . Apr 20, 2023 · 我们在第七篇—YOLOv5模型创建(YOLOv5专题)中完成了YOLOv5模型的创建,YOLOv5官方提供了YOLOv5s、YOLOv5m、YOLOv5l和YOLOv5x四个模型在COCO数据集上训练的权重文件,分别是yolov5s. 4 participants. Refer to the usage guide and examples for more information about different Jan 6, 2023 · Weights, Biases, Parameters, Gradients, and Final Model Summary. Prepare your dataset. YOLOv5のtrain. Alternatively see our YOLOv5 Train Custom Data Tutorial for model training. h5 Finally, it did. This will involve collecting and labeling a large number of images that contain the objects you want Dec 5, 2020 · This issue only occur when somebody are loading the trained model with torch. Small batch sizes produce poor batchnorm statistics and should be avoided. runs/exp/weights/best. ; Question. yolov5s6. To upload model weights to Roboflow, you can use the deploy () function. You can see their comparison here. pt--epochs 1 $ yolov5 classify predict--img 640--weights yolov5s-cls. py --source . hub. Usage: $ python val. 0 python export. pt, along with their P6 counterparts i. One file is the jpeg image file and the other is . You should use torch. Weights & Biases, developer tools for machine learning. This is part of routine Ultralytics maintenance and takes place on every major YOLOv5 release. face. 分割模型使用示例. Dec 13, 2021 · Search before asking. This function will send the specified weights up to the Roboflow cloud and deploy your model, ready for use on whatever deployment device you want (i. 0 release): 3 output layers P3, P4, P5 at strides 8, 16, 32, trained at --img 640 YOLOv5-P6 models: 4 output layers P3, P4, P5, P6 at strides 8, 16, 32, 64 trained at --img 1280 Example usage: # Command Line python detect. huband setting pretrainedto be False. Training weights would be stored in a folder named runs/train/name; hyp: YAML file that describes hyperparameter choices. Here is the syntax python train. pt、yolov5l. Load a State Dict. py but I get Your ONNX model has been generated with INT64 weights, while TensorRT does not natively support INT64. Track and debug your YOLOv5 models. Dec 13, 2021 · I have searched the YOLOv5 issues and discussions and found no similar questions. Evaluate our YOLOv5 model's performance. SyntaxError: Unexpected token < in JSON at position 4. yaml --weights yolov5s-seg. Oct 22, 2020 · 5. pt and detect. pyのオプションをまとめてみました。. There are some issues with your torch. In addition, we provide the FP32 and INT8 model accuracy calculation methods, introduce OpenVINO Benchmark App for performance YoloV5 best weights trained on custom repository. Models and datasets download automatically from the latest YOLOv5 release. content_copy. But I want to detect those three section In one run. Automatic bounding box debugging, system metrics, model performance metrics in the cloud, and shareable and reproducible model training for YOLOv5, using W&B. py --weights yolov5m. By default, YOLO only displays objects detected with a confidence of . YOLOv5分割训练支持自动下载 COCO128-seg 分割数据集 Nov 12, 2023 · Train a YOLOv5s model on COCO128 by specifying dataset, batch-size, image size and either pretrained --weights yolov5s. Instead, part of the initial weights are frozen in place, and the rest of the weights are used to compute loss and are updated by the optimizer. Sep 20, 2022 · In this article, we will introduce how to use OpenVINO TM 2022. Train/Val/Predict with YOLOv5 instance This repository contains a two-stage-tracker. Close the active learning loop by sampling images from your inference conditions with the `roboflow` pip package. h5 W&B is directly integrated into YOLOv5, providing experiment metric tracking, model and dataset versioning, rich model prediction visualization, and more. py --data coco. pt --include engine --device 0 --half. py. py ), inference ( detect. darknet -> tensorrt. I have modified coco128. Please, help me to save the best-trained weights. pt into the content/yolov5/weights directory. keyboard_arrow_up. yaml --weights yolov5x. py ), testing ( test. Nov 12, 2023 · 生成和导出 中的数据集 YOLOv5 Pytorch 格式。确保应用了预处理步骤,如自动调整方向和调整大小(拉伸)至正方形输入尺寸(如 640x640)。 下载数据集,并将其整合到YOLOv5 训练脚本中。 在商业应用中使用YOLOv5 有哪些许可选项? Ultralytics 提供两种许可选项: Jan 16, 2024 · According to the recognition results of the YOLOv5 model and KNN color recognition, the study proposes a weighting subroutine to calculate the human weights of each block and the hierarchical human-weight-first (HWF) path planning algorithm to dispatch the UAV to capture images repeatedly of the search area and each block at different altitudes. LoadImagesAndLabels. To look closely at weights, biases, shapes, and parameters at each layer in the YOLOv5-small model, refer to the following information. See full details in our Release Notes and visit our YOLOv5 Segmentation Colab Notebook for quickstart tutorials. /assets/MOT17-mini/train --yolo-model yolov8n. 📚 This guide explains how to freeze YOLOv5 🚀 layers when transfer learning. py --weights best. pt, or from randomly initialized --weights '' --cfg yolov5s-seg. Train a YOLOv5s model on the COCO128 dataset with --data coco128. 目录. model=torch. 1 Post-training Optimization Tool (POT) API for YOLOv5 Model INT8 quantization, to achieve model compression and inference performance improvement. I want to detect Face,hand,legs in single screen. Here's an example of how you can achieve this using PyTorch: import torch # Define your YOLOv5 model model = torch. pt--source images/ Segment. Ensure to validate the model’s performance through techniques like tensorboard visualization and rigorous validation to assess accuracy and efficacy in Nov 12, 2023 · This command exports a pretrained YOLOv5s model to TorchScript and ONNX formats. 0 license """ Train a YOLOv5 model on a custom dataset. pt --reid-model weights/osnet_x0_25_msmt17. No Active Events. $ python export. pt (recommended), or randomly initialized --weights '' --cfg yolov5s. /inference/images/ folder and the weights is set as the yolov5s. I will use yolo weights in android so I plan to convert yolo weights file to tflite file. mp4 # video. YOLOv5 🚀 is a family of object detection architectures and models pretrained on the COCO dataset, and represents Ultralytics open-source research into future vision AI methods, incorporating lessons learned and best practices evolved over thousands of hours yolov5-v7. txt text file where information about the labels within the image is stored. We can get the class weights directly from authors' code. @ou525 @yxNONG you can request pretrained weights with train. 0 release into this repository. Args: opt (argparse. If we simply choose to reduce the size of the network input, such as 640 to 320, as the size of the model is reduced accordingly the detection effect will also have a Sep 15, 2022 · To solve this problem, an improved YOLOv5 road damage detection algorithm, MN-YOLOv5, was proposed. . Nov 16, 2022 · only takes one argument. YOLOv5 🚀 is a family of object detection architectures and models pretrained on the COCO dataset, and represents Ultralytics open-source research into future vision AI methods, incorporating lessons learned and best practices evolved over thousands of hours of research and development. weights model_data/yolo. Line 266 in 63ddb6f. CI tests verify correct operation of YOLOv5 training ( train. e. vid. Jun 16, 2022 · Ashlesha1995 commented on Jun 20, 2022. Now that our custom YOLOv5 object detector has been verified, we might want to take the weights out of Colab for use on a live computer vision task. pt checkpoint. You signed in with another tab or window. pt; hands. yaml --weights yolov5s. load(). weights and *. py yolov3. edited. I have 3 weight file. Example inference sources are: python classify/predict. yolov5-m which is a medium version. 复现命令 python segment/val. /runs/dets_n_embs separately for each selected yolo and reid model $ python tracking/generate_dets_n_embs. Apr 22, 2021 · YOLOv5 is a popular repository for training YOLO-type single shot object det Hey everyone! In this we'll be looking at YOLOv5 & Weights & Biases integration. I have searched the YOLOv5 issues and discussions and found no similar questions. py : Contribute to ultralytics/yolov5 development by creating an account on GitHub. Train YOLOv5 to recognize the objects in our dataset. Models download automatically from the latest YOLOv5 release. In yolov5 we use this lines of code, import utils. hub. Jun 7, 2022 · Project description. You must provide your own training script in this case. Train. This tutorial guides you through installing and running YOLOv5 on Windows with PyTorch GPU support. yaml, starting from pretrained --weights yolov5s-seg. ※【引用】YOLOv5のコードは こちら 。. 我们希望这里的资源能帮助您充分利用 YOLOv5。. Thus, the script where we use our model weights to call inference should reference this weights file path. 一つの表中でオプションは五十音順にソートしております。. warning during TRT engine creation. It can be seen from our graphs above, even with the smallest pre-trained weights and relatively low number of epochs our model is performing really well, especially in senario 1 and 2. load('ultralytics/yolov5', 'yolov5s', pretrained=True, classes=80) And there is a tutorial of the usage with torch. py should be in inside yolov5 folder. Transfer learning is a useful way to quickly retrain a model on new data without having to retrain the entire network. Question I want to train a yolov5s on my own dataset and randomly initialize the weights. Apr 21, 2022 · YOLOv5 and other YOLO networks use two files with the same name, but the extension of files is different. It's normal using. Batch size. Oct 11, 2021 · yolov5/data内にある設定が書いてあるyamlファイルの指定--cfg: yolov5/models内にあるモデル構造の指定(pretrainモデルを指定しない場合に指定する)--weights: 重みを指定(推奨はyolov5s. 模型转换 到 FP32 的 ONNX 和 FP16 的 TensorRT 脚本为 export. I use this code in anaconda prompt because I downloaded keras library in env. It does not matter how many output classes are specified in yolov5s. cfg yolov3. Nov 14, 2021 · This YOLOv3 release merges the most recent updates to YOLOv5 featured in the April 11th, 2021 YOLOv5 v5. 想進一步提升AP表現,可以參考 Advanced YoloV5 tutorial — Enhancing YoloV5 with Weighted Boxes Fusion、Fusing EfficientNet & YoloV5 — Advanced Object Detection 2 stage pipeline tutorial、Kaggle上的notebooks 6. png Jun 10, 2020 · Export Saved YOLOv5 Weights for Future Inference . 3. Usage - Single-GPU training: $ python train. It's as easy as running a single pip install before you run your YOLO experiments! I have been training the yolov5 for my custom dataset but it is unable to save best. pt. Before running inference, make sure that image. model. We want to convert it into Yolov8, But we facing issue on utils and dataloders. Use: python3 /YOLOv5/yolov5/train. Apr 24, 2021 · @care55 yes you can start training from any pretreind YOLOv5 weights using the --weights command. img. Question. 昂础晋宴摸割致卧宪问:. You signed out in another tab or window. You switched accounts on another tab or window. pt --include torchscript 使用命令行pnnx yolov5s. Release Asssets. load ( 'ultralytics/yolov5', 'yolov5s', pretrained=True, classes=10) In this case the model will be composed of pretrained weights except for the output layers, which are no longer the same shape as the pretrained output layers. pt Right now, I run run every single weight file and detect particular section. You can then run inference inside yolov5 folder by using this command: python detect. if you train at --img 1280 you should also test and detect at --img 1280. ptなどのpretrainされたものを使う。これで指定するとダウンロードされる。 YOLOv5 🚀 是世界上最受欢迎的视觉 AI,代表 Ultralytics 对未来视觉 AI 方法的开源研究,结合在数千小时的研究和开发中积累的经验教训和最佳实践。. Nov 22, 2022 · on Nov 22, 2022. yolov5s. Maintainer. pt --cache. torchscript # TorchScript yolov5s. pt or you own custom training checkpoint i. All pretrained layers with matching sizes are loaded. Security. sh. Returns: None Note: This function performs essential pre-execution checks and initiates the YOLOv5 detection process based on user-specified options. Only last. PathLike object. pt--include torchscript,onnx,coreml,pb,tfjs Classify. Monitor loss; if it continues decreasing after 50 epochs, consider extending training based on dataset characteristics. to ( device) * nc # attach class weights. Explore and run machine learning code with Kaggle Notebooks | Using data from coco128. # saves dets and embs under . pt,这四个权重文件保存在YOLOv5官方项目的weights文件夹中,如下图:weights文件夹内容因为我们创建的 License. - enazoe/yolo-tensorrt We do not freeze any layer and train. Recommended for small to medium-sized datasets (i. Unexpected token < in JSON at position 4. See function `parse_opt` for details. pt # PyTorch yolov5s. /darknet detect cfg/yolov3. from models. cache_labels. pt Model summary: 567 layers, 86217814 parameters, 86217814 gradients 3. py --weights yolov5s-seg. py --data coco128. Aug 15, 2020 · If you are running YOLOv5 locally, ensure your environment meets all of the requirements. Refresh. pt yolov8s. If you want to build the engine for your custom weights, simply do the following: Train Yolov5 on your custom dataset; Export Weights PyTorch weights to ONNX; Make sure you use the ---dynamic flag while exporting your custom weights. pt、yolov5m. onnx # ONNX Runtime 蜘睁火yolov5踪开,母静攒汽柄伺满棘存. While training you can pass the YAML file to select any of these models. Namespace): Command-line arguments for YOLOv5 detection. Train Custom Data 🚀 RECOMMENDED; Tips for Best Training Results ☘️ RECOMMENDED; Weights & Biases Logging 🌟 NEW; Supervisely Ecosystem 🌟 NEW; Multi-GPU Training; PyTorch Hub ⭐ NEW; TorchScript, ONNX, CoreML Export 🚀; Test-Time Augmentation (TTA) Jun 10, 2020 · edited. Export our dataset to YOLOv5. 丢瞬吱. It can track any object that your Yolov5 model was trained to detect. py in /home/yolov5/ dir for your source /home/train/images/, but you want to save only labels txt results in folder /home/train/labels/ without saving input images in result folder. pt; legs. You don README. History. pt files This is the code that I run before executing train. Subscribe. yaml and run the sh Nov 12, 2023 · 此徽章表示YOLOv5 GitHub Actions 的所有持续集成(CI)测试均已成功通过。这些 CI 测试严格检查了YOLOv5 在训练、验证、推理、导出和基准等多个关键方面的功能和性能。它们确保在 macOS、Windows 和 Ubuntu 上运行的一致性和可靠性,每 24 小时和每次新提交时都会进行一 Feb 1, 2023 · Export and Upload YOLOv5 Weights. py was run with the following parameters: img 256, epochs 100, batch-size 32 Nov 12, 2023 · To load a YOLOv5 model for training rather than inference, set autoshape=False. 25 or higher. Jun 28, 2020 · It basically runs the YOLOv5 algorithm on all the images present in the . pt file is getting saved after every training. Use the largest --batch-size that your hardware allows for. Nov 15, 2021 · 1. classify/predict. To do so we import a Google Drive module and send them out. pt, or from randomly initialized --weights '' --cfg yolov5s. YOLOv5(Inference) 先ほど学習させたモデルを活用して推論を行いましょう。 その前に、推論で行うためのテスト画像を用意しておきましょう。 用意するのが難しい場合は、検証用画像を使用しましょう。 –weight: 先ほど学習させたモデルを指定します。 Best inference results are obtained at the same --img as the training was run at, i. pt --img 640 # P5 model at 640 python Jan 7, 2023 · This will include the source code and pretrained weights for the model. If the wrapper is useful to you,please Star it. 请浏览 YOLOv5 文档 了解详细信息,在 GitHub 上提交问题以获得支持 604 lines (535 loc) · 29. dataloaders. pt --img 640 # from pretrained (recommended) $ python Oct 25, 2020 · In our YOLOv5 example above where we linked our Google Drive, we loaded our weights called best. pt --batch 1. utils. We freeze only the backbone layers (10) and again train. Contribute to ultralytics/yolov5 development by creating an account on GitHub. Support Yolov5n,s,m,l,x . Additionally, you can also refer to the following brief summary of the YOLO v5 — small model. Train a YOLOv5s-seg model on the COCO128 dataset with --data coco128-seg. pt, yolov5l. param,它的内容是 Model trained using the YOLOv5 model on Google Colab YOLOv5 repository was cloned into the cloud machine and train. We freeze all the layers in yolov5 and train. If the issue persists, it's likely a problem on our side. Other options are yolov5n. You can change this by passing the -thresh <val> flag to the yolo command. 引数がなしとなっているオプションはそのオプションを記述することでflagが立つ (Trueと Jun 23, 2022 · In the folder runs/train/exp there are two yaml-files, one 0-file and one weights folder But the weights folder is empty and does not have . GPL-3. Apr 12, 2022 · You can’t ignore YOLOv5! YOLOv5 has gained much traction, controversy, and appraisals since its first release in 2020. 986 lines (878 loc) · 46 KB. I generated an ONNX model with export. Run bash script: python data\download_weights. No branches or pull requests. Nov 12, 2023 · Start from Pretrained weights. yolo import Detect, Model Development. pt, yolov5m. If you train an 80 class model, then all pretrained layers are loaded. load_state_dict() method to load your trained parameters to your model in addition to torch. # Ultralytics YOLOv5 🚀, AGPL-3. pt weight folder located in your yolov5 directory. Pass the name of the model to the --weights argument. 7 KB. pt # evolve parameters for specified tracking method using the selected detections and embeddings Feb 20, 2024 · Transfer the selected weight file to the “YoloV5/weights” folder. VOC, VisDrone, GlobalWheat). py ) on MacOS, Windows, and Ubuntu every 24 hours and on every commit. Documentation. pt is the 'small' model, the second-smallest model available. And also no need to increment dir) Loads and fuses an ensemble or single YOLOv5 model from weights, handling device placement and model adjustments. py --img 640 --batch 16 --epochs 3 --data coco128. py --img-size 640 --batch 8 --epochs 300 --data data. To load a model with randomly initialized weights (to train from scratch) use pretrained=False. And please enlighten your thoughts on best. hai @jungyin you can follow the yolov5 train custom data, there while traing pass weights as empty. with the shape of (nc). yolov5-x which is an extra-large version. TensorRT8. orig_cache_labels = utils. pt file like what it is? In this tutorial, we assemble a dataset and train a custom YOLOv5 model to recognize the objects in our dataset. Create notebooks and keep track of their status here. yaml --img 640 Usage - formats: $ python val. yaml (not recommended). I would recommend you start from the Train Custom Data tutorial which answers many of these questions: YOLOv5 Tutorials. This release implements YOLOv5-P6 models and retrained YOLOv5-P5 models: YOLOv5-P5 models (same architecture as v4. Train/Val/Predict with YOLOv5 image classifier: $ yolov5 classify train--img 640--data mnist2560--weights yolov5s-cls. Jun 9, 2021 · Also copy the image that you want to test inside yolov5 folder. activate env python convert. We have been experimenting with YOLOv5 for a while This project uses YOLOv5 to realize character detection in CSGO games and auto aim. ncnn. Excitation obtains the weight of each channel after normalization through two layers of full 3. Hyperparameters. 1. Predict. py --cfg c --weights yolov5s. txt dependencies specified below. Includes an easy-to-follow video and Google Colab. 在这种情况下,您必须提供自己的培训脚本。或者参见我们的YOLOv5 培训自定义数据教程 用于模型训练。 Weights & Biases is directly integrated into YOLOv5, providing experiment metric tracking, model and dataset versioning, rich model prediction visualization, and more. hubin #36, and you comment that. Jul 12, 2023 · edited. pt和yolov5x. Pretrained weights are auto-downloaded from the latest YOLOv5 release. Aug 7, 2022 · YOLOv5 is already a cracking lightweight detection network where the trained weight model generally does not exceed 30 MB, which is still too large for some embedded devices. py ) and export ( export. I trained it almost 3 times, thinking that it is an issue with the notebook. Jun 15, 2020 · To train the YOLOv5 Glenn has proposed 4 versions. In this report, we'll be going step-by-step through the process of getting you up-and-running with YOLOv5 and creating your own bounding boxes on your Windows machine. py --source 0 # webcam. Jul 8, 2022 · YOLOv5 🚀 official weights are available to download 3 ways: Download Script. After training the weights on YOLOv5 and saving the results on WandB, how do I save and retrieve those weights from WandB for using the trained weights to detect images in the test set? . YOLOv5 🚀 is a family of object detection architectures and models pretrained on the COCO dataset, and represents Ultralyticsopen-source research into future vision AI methods, incorporating lessons learned and best practices evolved over thousands of hours of research and development. ph il fu rz bc pr cs it xb wi