Use named imports in models.yolo (#12576)

models/yolo.py

@@ -8,12 +8,16 @@ Usage:
 
 import argparse
 import contextlib
+import math
 import os
 import platform
 import sys
 from copy import deepcopy
 from pathlib import Path
 
+import torch
+import torch.nn as nn
+
 FILE = Path(__file__).resolve()
 ROOT = FILE.parents[1]  # YOLOv5 root directory
 if str(ROOT) not in sys.path:
@@ -21,10 +25,12 @@ if str(ROOT) not in sys.path:
 if platform.system() != 'Windows':
     ROOT = Path(os.path.relpath(ROOT, Path.cwd()))  # relative
 
-from models.common import *  # noqa
-from models.experimental import *  # noqa
+from models.common import (C3, C3SPP, C3TR, SPP, SPPF, Bottleneck, BottleneckCSP, C3Ghost, C3x, Classify, Concat,
+                           Contract, Conv, CrossConv, DetectMultiBackend, DWConv, DWConvTranspose2d, Expand, Focus,
+                           GhostBottleneck, GhostConv, Proto)
+from models.experimental import MixConv2d
 from utils.autoanchor import check_anchor_order
-from utils.general import LOGGER, check_version, check_yaml, make_divisible, print_args
+from utils.general import LOGGER, check_version, check_yaml, colorstr, make_divisible, print_args
 from utils.plots import feature_visualization
 from utils.torch_utils import (fuse_conv_and_bn, initialize_weights, model_info, profile, scale_img, select_device,
                                time_sync)