Meshgrid indexing='ij' for PyTorch 1.10 (ultralytics#5309)

* Meshgrid `indexing='ij'` for PyTorch 1.10

Will not merge currently as breaks backwards compatibility.

* Meshgrid `indexing='ij'` for PyTorch 1.10

Will not merge currently as breaks backwards compatibility.

* Add check_version hard argument

* Update comment

models/yolo.py

@@ -20,7 +20,7 @@
 from models.common import *
 from models.experimental import *
 from utils.autoanchor import check_anchor_order
-from utils.general import check_yaml, make_divisible, print_args, set_logging
+from utils.general import check_yaml, make_divisible, print_args, set_logging, check_version
 from utils.plots import feature_visualization
 from utils.torch_utils import copy_attr, fuse_conv_and_bn, initialize_weights, model_info, scale_img, \
     select_device, time_sync
@@ -74,7 +74,10 @@ def forward(self, x):
 
     def _make_grid(self, nx=20, ny=20, i=0):
         d = self.anchors[i].device
-        yv, xv = torch.meshgrid([torch.arange(ny).to(d), torch.arange(nx).to(d)])
+        if check_version(torch.__version__, '1.10.0'):  # torch>=1.10.0 meshgrid workaround for torch>=0.7 compatibility
+            yv, xv = torch.meshgrid([torch.arange(ny).to(d), torch.arange(nx).to(d)], indexing='ij')
+        else:
+            yv, xv = torch.meshgrid([torch.arange(ny).to(d), torch.arange(nx).to(d)])
         grid = torch.stack((xv, yv), 2).expand((1, self.na, ny, nx, 2)).float()
         anchor_grid = (self.anchors[i].clone() * self.stride[i]) \
             .view((1, self.na, 1, 1, 2)).expand((1, self.na, ny, nx, 2)).float()

utils/augmentations.py

@@ -20,7 +20,7 @@ def __init__(self):
         self.transform = None
         try:
             import albumentations as A
-            check_version(A.__version__, '1.0.3')  # version requirement
+            check_version(A.__version__, '1.0.3', hard=True)  # version requirement
 
             self.transform = A.Compose([
                 A.Blur(p=0.01),

utils/general.py

@@ -220,14 +220,17 @@ def check_git_status():
 
 def check_python(minimum='3.6.2'):
     # Check current python version vs. required python version
-    check_version(platform.python_version(), minimum, name='Python ')
+    check_version(platform.python_version(), minimum, name='Python ', hard=True)
 
 
-def check_version(current='0.0.0', minimum='0.0.0', name='version ', pinned=False):
+def check_version(current='0.0.0', minimum='0.0.0', name='version ', pinned=False, hard=False):
     # Check version vs. required version
     current, minimum = (pkg.parse_version(x) for x in (current, minimum))
-    result = (current == minimum) if pinned else (current >= minimum)
-    assert result, f'{name}{minimum} required by YOLOv5, but {name}{current} is currently installed'
+    result = (current == minimum) if pinned else (current >= minimum)  # bool
+    if hard:  # assert min requirements met
+        assert result, f'{name}{minimum} required by YOLOv5, but {name}{current} is currently installed'
+    else:
+        return result
 
 
 @try_except