ultralytics 8.0.50 AMP check and YOLOv5u YAMLs (#1263)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Troy <wudashuo@vip.qq.com>
Co-authored-by: Yonghye Kwon <developer.0hye@gmail.com>
Co-authored-by: Ayush Chaurasia <ayush.chaurarsia@gmail.com>
Co-authored-by: Laughing <61612323+Laughing-q@users.noreply.github.com>
Co-authored-by: Huijae Lee <46982469+ZeroAct@users.noreply.github.com>

ultralytics/yolo/data/dataloaders/stream_loaders.py

@@ -26,6 +26,7 @@ class SourceTypes:
     webcam: bool = False
     screenshot: bool = False
     from_img: bool = False
+    tensor: bool = False
 
 
 class LoadStreams:
@@ -329,6 +330,23 @@ class LoadPilAndNumpy:
         return self
 
 
+class LoadTensor:
+
+    def __init__(self, imgs) -> None:
+        self.im0 = imgs
+        self.bs = imgs.shape[0]
+
+    def __iter__(self):
+        self.count = 0
+        return self
+
+    def __next__(self):
+        if self.count == 1:
+            raise StopIteration
+        self.count += 1
+        return None, self.im0, self.im0, None, ''  # self.paths, im, self.im0, None, ''
+
+
 def autocast_list(source):
     """
     Merges a list of source of different types into a list of numpy arrays or PIL images