Implementation:Obss Sahi Download Yolov5 Model

Knowledge Sources	Obss_Sahi
Domains	Object_Detection, Model_Setup
Last Updated	2026-02-08 12:00 GMT

Overview

Utility functions for downloading YOLOv5 model weights (Nano, Small-P6, Medium-P6 variants) from Ultralytics releases.

Description

The sahi.utils.yolov5 module provides convenience functions for downloading YOLOv5 model weights. Yolov5TestConstants defines download URLs and default local paths for YOLOv5n (v6.0), YOLOv5s6 (v5.0), and YOLOv5m6 (v5.0) model variants. Each download function checks if the file already exists before downloading, and creates parent directories as needed.

Usage

Use these functions to obtain YOLOv5 model weights before initializing the YOLOv5 detection model in SAHI, particularly in test environments or first-time setup.

Code Reference

Source Location

• Repository: Obss_Sahi
• File: sahi/utils/yolov5.py
• Lines: 1-42

Signature

class Yolov5TestConstants:
    YOLOV5N_MODEL_URL: str
    YOLOV5N_MODEL_PATH: str
    YOLOV5S6_MODEL_URL: str
    YOLOV5S6_MODEL_PATH: str
    YOLOV5M6_MODEL_URL: str
    YOLOV5M6_MODEL_PATH: str

def download_yolov5n_model(destination_path: str | None = None) -> None: ...
def download_yolov5s6_model(destination_path: str | None = None) -> None: ...

Import

from sahi.utils.yolov5 import download_yolov5n_model, download_yolov5s6_model, Yolov5TestConstants

I/O Contract

Inputs

Name	Type	Required	Description
destination_path	str or None	No	Custom download path; defaults to tests/data/models/yolov5/

Outputs

Name	Type	Description
Model file	.pt file	YOLOv5 model weights at destination path

Usage Examples

Download YOLOv5 Models

from sahi.utils.yolov5 import download_yolov5n_model, download_yolov5s6_model

# Download YOLOv5n to default test path
download_yolov5n_model()

# Download YOLOv5s6 to custom path
download_yolov5s6_model(destination_path="/models/yolov5s6.pt")

Related Pages

• Environment:Obss_Sahi_Python_Detection_Frameworks