predict.py file

import cv2
from ultralytics import YOLO

# Load a pretrained YOLOv8 model
model = YOLO("best.pt") 

results = model.predict("output_IMG_7671.MOV", show=True)

When I finish my training with my customized data, then I tried to predict, but the result is still as pretrained outcome. But data.yaml file is actually within the new class, I need some help to deal with this problem.