why is my object detection bounding box error.. bounding box always detected anything but not move... the accuracy changed - tensorflow

Question

this is my code for train model for object detection. i used google colab. using ssd_mobilenet_v2_fpnlite_320x320_coco17_tpu-8.config. i have an error when try to detect image. its not detect my picture but always show the bounding box. bounding box is not moving but the accuracy changed
%cd /content/models/research/object_detection
#Loading the saved_model
import tensorflow as tf
import time
import numpy as np
import warnings
warnings.filterwarnings('ignore')
from PIL import Image
from google.colab.patches import cv2_imshow
from object_detection.utils import label_map_util
from object_detection.utils import visualization_utils as viz_utils
IMAGE_SIZE = (12, 8) # Output display size as you want
import matplotlib.pyplot as plt
PATH_TO_SAVED_MODEL="/mydrive/customTF2/data/inference_graph/saved_model"
print('Loading model...', end='')
# Load saved model and build the detection function
detect_fn=tf.saved_model.load(PATH_TO_SAVED_MODEL)
print('Done!')
#Loading the label_map
category_index=label_map_util.create_category_index_from_labelmap("/mydrive/customTF2/data/label_map.pbtxt",use_display_name=True)
#category_index=label_map_util.create_category_index_from_labelmap([path_to_label_map],use_display_name=True)
def load_image_into_numpy_array(path):
return np.array(Image.open(path))
image_path = "/mydrive/papaya_test_images/pp.jpg"
#print('Running inference for {}... '.format(image_path), end='')
image_np = load_image_into_numpy_array(image_path)
# The input needs to be a tensor, convert it using `tf.convert_to_tensor`.
input_tensor = tf.convert_to_tensor(image_np)
# The model expects a batch of images, so add an axis with `tf.newaxis`.
input_tensor = input_tensor[tf.newaxis, ...]
detections = detect_fn(input_tensor)
# All outputs are batches tensors.
# Convert to numpy arrays, and take index [0] to remove the batch dimension.
# We're only interested in the first num_detections.
num_detections = int(detections.pop('num_detections'))
detections = {key: value[0, :num_detections].numpy()
for key, value in detections.items()}
detections['num_detections'] = num_detections
# detection_classes should be ints.
detections['detection_classes'] = detections['detection_classes'].astype(np.int64)
image_np_with_detections = image_np.copy()
viz_utils.visualize_boxes_and_labels_on_image_array(
image_np_with_detections,
detections['detection_boxes'],
detections['detection_classes'],
detections['detection_scores'],
category_index,
use_normalized_coordinates=True,
max_boxes_to_draw=200,
min_score_thresh=.07, # Adjust this value to set the minimum probability boxes to be classified as True
agnostic_mode=False)
%matplotlib inline
plt.figure(figsize=IMAGE_SIZE, dpi=200)
plt.axis("off")
plt.imshow(image_np_with_detections)
plt.show()