TorchScript single-output fix (#7261)

export.py

 
 def export_formats():
     # YOLOv5 export formats
-    x = [['PyTorch', '-', '.pt', True], ['TorchScript', 'torchscript', '.torchscript', True],
-         ['ONNX', 'onnx', '.onnx', True], ['OpenVINO', 'openvino', '_openvino_model', False],
-         ['TensorRT', 'engine', '.engine', True], ['CoreML', 'coreml', '.mlmodel', False],
-         ['TensorFlow SavedModel', 'saved_model', '_saved_model', True], ['TensorFlow GraphDef', 'pb', '.pb', True],
-         ['TensorFlow Lite', 'tflite', '.tflite', False], ['TensorFlow Edge TPU', 'edgetpu', '_edgetpu.tflite', False],
-         ['TensorFlow.js', 'tfjs', '_web_model', False]]
+    x = [
+        ['PyTorch', '-', '.pt', True],
+        ['TorchScript', 'torchscript', '.torchscript', True],
+        ['ONNX', 'onnx', '.onnx', True],
+        ['OpenVINO', 'openvino', '_openvino_model', False],
+        ['TensorRT', 'engine', '.engine', True],
+        ['CoreML', 'coreml', '.mlmodel', False],
+        ['TensorFlow SavedModel', 'saved_model', '_saved_model', True],
+        ['TensorFlow GraphDef', 'pb', '.pb', True],
+        ['TensorFlow Lite', 'tflite', '.tflite', False],
+        ['TensorFlow Edge TPU', 'edgetpu', '_edgetpu.tflite', False],
+        ['TensorFlow.js', 'tfjs', '_web_model', False],]
     return pd.DataFrame(x, columns=['Format', 'Argument', 'Suffix', 'GPU'])
 
 

models/common.py

     def forward(self, im, augment=False, visualize=False, val=False):
         # YOLOv5 MultiBackend inference
         b, ch, h, w = im.shape  # batch, channel, height, width
-        if self.pt or self.jit:  # PyTorch
-            y = self.model(im) if self.jit else self.model(im, augment=augment, visualize=visualize)
-            return y if val else y[0]
+        if self.pt:  # PyTorch
+            y = self.model(im, augment=augment, visualize=visualize)[0]
+        elif self.jit:  # TorchScript
+            y = self.model(im)[0]
         elif self.dnn:  # ONNX OpenCV DNN
             im = im.cpu().numpy()  # torch to numpy
             self.net.setInput(im)