add prediction boilerplate

Signed-off-by: Praneeth <praneethbedapudi@gmail.com>

Author: bedapudi6788

predictor.py

@@ -9,3 +9,47 @@
 import cv2
 import numpy as np
 
+WEIGHTS_URL = 'https://github.com/notAi-tech/LogoDet/releases/download/292_classes_v1/weights'
+CLASSES_URL = 'https://github.com/notAi-tech/LogoDet/releases/download/292_classes_v1/classes'
+
+home = os.path.expanduser("~")
+model_folder = os.path.join(home, '.LogoDet/')
+if not os.path.exists(model_folder):
+    os.mkdir(model_folder)
+
+model_path = os.path.join(model_folder, 'weights')
+
+if not os.path.exists(model_path):
+    print('Downloading the checkpoint to', model_path)
+    pydload.dload(WEIGHTS_URL, save_to_path=model_path, max_time=None)
+
+classes_path = os.path.join(model_folder, 'classes')
+
+if not os.path.exists(classes_path):
+    print('Downloading the class list to', classes_path)
+    pydload.dload(CLASSES_URL, save_to_path=classes_path, max_time=None)
+
+detection_model = models.load_model(model_path, backbone_name='resnet50')
+classes = open(classes_path).readlines()
+classes = [i.strip() for i in classes if i.strip()]
+
+def detect_single(img_path, min_prob=0.4):
+    image = read_image_bgr(img_path)
+    image = preprocess_image(image)
+    image, scale = resize_image(image)
+    boxes, scores, labels = detection_model.predict_on_batch(np.expand_dims(image, axis=0))
+    boxes /= scale
+    processed_boxes = []
+    for box, score, label in zip(boxes[0], scores[0], labels[0]):
+        if score < min_prob:
+            continue
+        box = box.astype(int).tolist()
+        label = classes[label]
+        processed_boxes.append({'box': box, 'score': score, 'label': label})
+        
+    return processed_boxes
+
+
+def detect_batch():
+    # TODO
+    pass