Rename test.py to val.py (#4000)

models/yolo.py

@@ -310,4 +310,3 @@ if __name__ == '__main__':
     # tb_writer = SummaryWriter('.')
     # logger.info("Run 'tensorboard --logdir=models' to view tensorboard at http://localhost:6006/")
     # tb_writer.add_graph(torch.jit.trace(model, img, strict=False), [])  # add model graph
-    # tb_writer.add_image('test', img[0], dataformats='CWH')  # add model to tensorboard