Update check_requirements() with cmds=() argument (ultralytics#7543)

Author: glenn-jocher

export.py

@@ -337,14 +337,8 @@ def export_engine(model, im, file, train, half, simplify, workspace=4, verbose=F
     # YOLOv5 TensorRT export https://developer.nvidia.com/tensorrt
     try:
         assert im.device.type != 'cpu', 'export running on CPU but must be on GPU, i.e. `python export.py --device 0`'
-        try:
-            import tensorrt as trt
-        except Exception:
-            s = f"\n{prefix} tensorrt not found and is required by YOLOv5"
-            LOGGER.info(f"{s}, attempting auto-update...")
-            r = '-U nvidia-tensorrt --index-url https://pypi.ngc.nvidia.com'
-            LOGGER.info(subprocess.check_output(f"pip install {r}", shell=True).decode())
-            import tensorrt as trt
+        check_requirements(('nvidia-tensorrt',), cmds=('-U --index-url https://pypi.ngc.nvidia.com',))
+        import tensorrt as trt
 
         if trt.__version__[0] == '7':  # TensorRT 7 handling https://github.com/ultralytics/yolov5/issues/6012
             grid = model.model[-1].anchor_grid

utils/general.py

@@ -321,7 +321,7 @@ def check_version(current='0.0.0', minimum='0.0.0', name='version ', pinned=Fals
 
 
 @try_except
-def check_requirements(requirements=ROOT / 'requirements.txt', exclude=(), install=True):
+def check_requirements(requirements=ROOT / 'requirements.txt', exclude=(), install=True, cmds=()):
     # Check installed dependencies meet requirements (pass *.txt file or list of packages)
     prefix = colorstr('red', 'bold', 'requirements:')
     check_python()  # check python version
@@ -334,7 +334,7 @@ def check_requirements(requirements=ROOT / 'requirements.txt', exclude=(), insta
         requirements = [x for x in requirements if x not in exclude]
 
     n = 0  # number of packages updates
-    for r in requirements:
+    for i, r in enumerate(requirements):
         try:
             pkg.require(r)
         except Exception:  # DistributionNotFound or VersionConflict if requirements not met
@@ -343,7 +343,7 @@ def check_requirements(requirements=ROOT / 'requirements.txt', exclude=(), insta
                 LOGGER.info(f"{s}, attempting auto-update...")
                 try:
                     assert check_online(), f"'pip install {r}' skipped (offline)"
-                    LOGGER.info(check_output(f"pip install '{r}'", shell=True).decode())
+                    LOGGER.info(check_output(f"pip install '{r}' {cmds[i] if cmds else ''}", shell=True).decode())
                     n += 1
                 except Exception as e:
                     LOGGER.warning(f'{prefix} {e}')