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from typing import List
import cv2
import torch
import numpy as np
import config as modelConfig
from pytorch_grad_cam.utils.image import show_cam_on_image
from yolo3 import YOLOv3
from utils import cells_to_bboxes, non_max_suppression, draw_prediction_boxes, YoloGradCAM
model = YOLOv3(num_classes=20)
model.load_state_dict(torch.load("yolo3_model_trained1.pth", map_location="cpu"))
model.eval()
print("Yolov3 Model Loaded..")
scaled_anchors = (
torch.tensor(modelConfig.ANCHORS)
* torch.tensor(modelConfig.S).unsqueeze(1).unsqueeze(1).repeat(1, 3, 2)
).to(modelConfig.DEVICE)
yolo_grad_cam = YoloGradCAM(model=model, target_layers=[model.layers[-2]], use_cuda=True)
@torch.inference_mode()
def detect_objects(image: np.ndarray, iou_thresh: float = 0.5, thresh: float = 0.4, enable_grad_cam: bool = False, transparency: float = 0.5) -> List[np.ndarray]:
transformed_image = modelConfig.transforms(image=image)["image"].unsqueeze(0)
transformed_image = transformed_image.cuda()
output = model(transformed_image)
bboxes = [[] for _ in range(1)]
for i in range(3):
batch_size, A, S, _, _ = output[i].shape
anchor = scaled_anchors[i]
boxes_scale_i = cells_to_bboxes(
output[i], anchor, S=S, is_preds=True
)
for idx, (box) in enumerate(boxes_scale_i):
bboxes[idx] += box
nms_boxes = non_max_suppression(
bboxes[0], iou_threshold=iou_thresh, threshold=thresh, box_format="midpoint",
)
plot_img = draw_prediction_boxes(image.copy(), nms_boxes, class_labels=modelConfig.PASCAL_CLASSES)
if not enable_grad_cam:
return [plot_img]
grayscale_cam = yolo_grad_cam(transformed_image, scaled_anchors)[0, :, :]
img = cv2.resize(image, (416, 416))
img = np.float32(img) / 255
grad_cam_image = show_cam_on_image(img, grayscale_cam, use_rgb=True, image_weight=transparency)
return [plot_img, grad_cam_image]
if __name__=="__main__":
image = cv2.imread("images/001155.jpg")
image = predict(image)
cv2.imshow("image", image)
cv2.waitKey(0)
cv2.destroyAllWindows()
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