Update requirements.txt comment https://pytorch.org/get-started/locally/

 (#9576)

* Update Requirements with PyTorch CUDA

Added --extra-index-url https://download.pytorch.org/whl/cu116 URL to requirements file for ease of creating venv with CUDA enabled PyTorch.  Otherwise CPU PyTorch is installed an unable to use local GPUs.

Signed-off-by: David A. Macey <davidamacey@gmail.com>

* Update requirements.txt

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Update requirements.txt

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

Signed-off-by: David A. Macey <davidamacey@gmail.com>
Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

requirements.txt

@@ -9,7 +9,7 @@ Pillow>=7.1.2
 PyYAML>=5.3.1
 requests>=2.23.0
 scipy>=1.4.1
-torch>=1.7.0
+torch>=1.7.0  # see https://pytorch.org/get-started/locally/ (recommended)
 torchvision>=0.8.1
 tqdm>=4.64.0
 # protobuf<=3.20.1  # https://github.com/ultralytics/yolov5/issues/8012