Update Colab Notebook CI (ultralytics#8798)

* Update Colab Notebook CI

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Created using Colaboratory

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update tutorial.ipynb

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

tutorial.ipynb

@@ -414,7 +414,7 @@
         "import utils\n",
         "display = utils.notebook_init()  # checks"
       ],
-      "execution_count": 1,
+      "execution_count": null,
       "outputs": [
         {
           "output_type": "stream",
@@ -466,7 +466,7 @@
         "!python detect.py --weights yolov5s.pt --img 640 --conf 0.25 --source data/images\n",
         "display.Image(filename='runs/detect/exp/zidane.jpg', width=600)"
       ],
-      "execution_count": 2,
+      "execution_count": null,
       "outputs": [
         {
           "output_type": "stream",
@@ -546,7 +546,7 @@
         "torch.hub.download_url_to_file('https://ultralytics.com/assets/coco2017val.zip', 'tmp.zip')\n",
         "!unzip -q tmp.zip -d ../datasets && rm tmp.zip"
       ],
-      "execution_count": 3,
+      "execution_count": null,
       "outputs": [
         {
           "output_type": "display_data",
@@ -577,7 +577,7 @@
         "# Run YOLOv5x on COCO val\n",
         "!python val.py --weights yolov5x.pt --data coco.yaml --img 640 --iou 0.65 --half"
       ],
-      "execution_count": 4,
+      "execution_count": null,
       "outputs": [
         {
           "output_type": "stream",
@@ -737,7 +737,7 @@
         "# Train YOLOv5s on COCO128 for 3 epochs\n",
         "!python train.py --img 640 --batch 16 --epochs 3 --data coco128.yaml --weights yolov5s.pt --cache"
       ],
-      "execution_count": 7,
+      "execution_count": null,
       "outputs": [
         {
           "output_type": "stream",
@@ -1032,24 +1032,22 @@
         "id": "FGH0ZjkGjejy"
       },
       "source": [
-        "# CI Checks\n",
+        "# YOLOv5 CI\n",
         "%%shell\n",
-        "export PYTHONPATH=\"$PWD\"  # to run *.py. files in subdirectories\n",
         "rm -rf runs  # remove runs/\n",
-        "for m in yolov5n; do  # models\n",
-        "  python train.py --img 64 --batch 32 --weights $m.pt --epochs 1 --device 0  # train pretrained\n",
-        "  python train.py --img 64 --batch 32 --weights '' --cfg $m.yaml --epochs 1 --device 0  # train scratch\n",
-        "  for d in 0 cpu; do  # devices\n",
-        "    python val.py --weights $m.pt --device $d # val official\n",
-        "    python val.py --weights runs/train/exp/weights/best.pt --device $d # val custom\n",
-        "    python detect.py --weights $m.pt --device $d  # detect official\n",
-        "    python detect.py --weights runs/train/exp/weights/best.pt --device $d  # detect custom\n",
+        "m=yolov5n  # official weights\n",
+        "b=runs/train/exp/weights/best  # best.pt checkpoint\n",
+        "python train.py --imgsz 64 --batch 32 --weights $m.pt --cfg $m.yaml --epochs 1 --device 0  # train\n",
+        "for d in 0 cpu; do  # devices\n",
+        "  for w in $m $b; do  # weights\n",
+        "    python val.py --imgsz 64 --batch 32 --weights $w.pt --device $d  # val\n",
+        "    python detect.py --imgsz 64 --weights $w.pt --device $d  # detect\n",
         "  done\n",
-        "  python hubconf.py  # hub\n",
-        "  python models/yolo.py --cfg $m.yaml  # build PyTorch model\n",
-        "  python models/tf.py --weights $m.pt  # build TensorFlow model\n",
-        "  python export.py --img 64 --batch 1 --weights $m.pt --include torchscript onnx  # export\n",
-        "done"
+        "done\n",
+        "python hubconf.py --model $m  # hub\n",
+        "python models/tf.py --weights $m.pt  # build TF model\n",
+        "python models/yolo.py --cfg $m.yaml  # build PyTorch model\n",
+        "python export.py --weights $m.pt --img 64 --include torchscript  # export"
       ],
       "execution_count": null,
       "outputs": []