yolov8 Tags=8.2 model = YOLO(model='yolov8n.yaml') error occurred

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YOLOv8 Component

Predict

Bug

from ultralytics import YOLO

model = YOLO(model='yolov8n.yaml')

The official model loading code cannot be run
The following error message is displayed：
Traceback (most recent call last):
File "D:\Project\ultralytics-main\vedio.py", line 1, in
from ultralytics import YOLO
File "D:\Project\ultralytics-main\ultralytics_init_.py", line 5, in
from ultralytics.data.explorer.explorer import Explorer
File "D:\Project\ultralytics-main\ultralytics\data_init_.py", line 3, in
from .base import BaseDataset
File "D:\Project\ultralytics-main\ultralytics\data\base.py", line 17, in
from ultralytics.data.utils import FORMATS_HELP_MSG, HELP_URL, IMG_FORMATS
File "D:\Project\ultralytics-main\ultralytics\data\utils.py", line 19, in
from ultralytics.nn.autobackend import check_class_names
File "D:\Project\ultralytics-main\ultralytics\nn_init_.py", line 3, in
from .tasks import (
File "D:\Project\ultralytics-main\ultralytics\nn\tasks.py", line 10, in
from ultralytics.nn.modules import (
File "D:\Project\ultralytics-main\ultralytics\nn\modules_init_.py", line 65, in
from .head import OBB, Classify, Detect, Pose, RTDETRDecoder, Segment, WorldDetect
File "D:\Project\ultralytics-main\ultralytics\nn\modules\head.py", line 10, in
from ultralytics.utils.tal import TORCH_1_10, dist2bbox, dist2rbox, make_anchors
File "D:\Project\ultralytics-main\ultralytics\utils_init_.py", line 401, in
DEFAULT_CFG_DICT = yaml_load(DEFAULT_CFG_PATH)
File "D:\Project\ultralytics-main\ultralytics\utils_init_.py", line 379, in yaml_load
data = yaml.safe_load(s) or {} # always return a dict (yaml.safe_load() may return None for empty files)
File "D:\Anaconda\envs\yolov8\lib\site-packages\yaml_init_.py", line 125, in safe_load
return load(stream, SafeLoader)
File "D:\Anaconda\envs\yolov8\lib\site-packages\yaml_init_.py", line 81, in load
return loader.get_single_data()
File "D:\Anaconda\envs\yolov8\lib\site-packages\yaml\constructor.py", line 49, in get_single_data
node = self.get_single_node()
File "D:\Anaconda\envs\yolov8\lib\site-packages\yaml\composer.py", line 36, in get_single_node
document = self.compose_document()
File "D:\Anaconda\envs\yolov8\lib\site-packages\yaml\composer.py", line 55, in compose_document
node = self.compose_node(None, None)
File "D:\Anaconda\envs\yolov8\lib\site-packages\yaml\composer.py", line 84, in compose_node
node = self.compose_mapping_node(anchor)
File "D:\Anaconda\envs\yolov8\lib\site-packages\yaml\composer.py", line 127, in compose_mapping_node
while not self.check_event(MappingEndEvent):
File "D:\Anaconda\envs\yolov8\lib\site-packages\yaml\parser.py", line 98, in check_event
self.current_event = self.state()
File "D:\Anaconda\envs\yolov8\lib\site-packages\yaml\parser.py", line 438, in parse_block_mapping_key
raise ParserError("while parsing a block mapping", self.marks[-1],
yaml.parser.ParserError: while parsing a block mapping
in "", line 4, column 1:
task: detect # (str) YOLO task, ...
^
expected , but found ''
in "", line 8, column 3:
gs ----------------------------- ...
^

Environment

Ultralytics YOLOv8.2.12 🚀 Python-3.8.19 torch-2.0.1 CUDA:0 (NVIDIA GeForce RTX 3060 Laptop GPU, 6144MiB)
Setup complete ✅ (20 CPUs, 31.7 GB RAM, 131.1/742.2 GB disk)

OS Windows-10-10.0.19045-SP0
Environment Windows
Python 3.8.19
Install pip
RAM 31.69 GB
CPU 12th Gen Intel Core(TM) i7-12700H
CUDA 11.7

matplotlib ✅ 3.7.5>=3.3.0
opencv-python ✅ 4.9.0.80>=4.6.0
pillow ✅ 10.3.0>=7.1.2
pyyaml ✅ 6.0.1>=5.3.1
requests ✅ 2.31.0>=2.23.0
scipy ✅ 1.10.1>=1.4.1
torch ✅ 2.0.1>=1.8.0
torchvision ✅ 0.15.2>=0.9.0
tqdm ✅ 4.66.4>=4.64.0
psutil ✅ 5.9.8
py-cpuinfo ✅ 9.0.0
thop ✅ 0.1.1-2209072238>=0.1.1
pandas ✅ 2.0.3>=1.1.4
seaborn ✅ 0.13.2>=0.11.0

Minimal Reproducible Example

No response

Additional

No response

Are you willing to submit a PR?

• Yes I'd like to help by submitting a PR!

[glenn-jocher]

Hello! It looks like you're encountering a YAML parsing error when trying to load the model configuration. This error typically occurs due to syntax issues in the YAML file. Here are a couple of steps you can take to resolve this:

1. Check YAML Syntax: Ensure that the yolov8n.yaml file is correctly formatted. Pay close attention to indentation levels, as YAML is sensitive to spaces and tabs.

2. Validate YAML File: You can use online tools like yamlvalidator.com to check if there are any syntax errors in your YAML file.

3. Example Code: Here's how you should typically load a YOLOv8 model:

   from ultralytics import YOLO
   
   # Load a pretrained model
   model = YOLO('yolov8n.pt')

If the issue persists after checking the YAML file, it might be helpful to share the contents of yolov8n.yaml so we can take a closer look. Let me know how it goes! 😊