Update check_requirements() exclude list (#2974)

detect.py

@@ -172,7 +172,7 @@ if __name__ == '__main__':
     parser.add_argument('--hide-conf', default=False, action='store_true', help='hide confidences')
     opt = parser.parse_args()
     print(opt)
-    check_requirements(exclude=('pycocotools', 'thop'))
+    check_requirements(exclude=('tensorboard', 'pycocotools', 'thop'))
 
     with torch.no_grad():
         if opt.update:  # update all models (to fix SourceChangeWarning)