在 PyTorch 里，torch.tile 其实就是 repeat 的一个封装，功能等价。 而 repeat 在 ONNX 里是受支持的（映射到 Repeat 节点）。
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Equal (2): Everything in this space must be equal to 2. The answer is 2-2, placed vertically; 2-5, placed vertically; 6-2, placed vertically.
-abcd # equivalent to -a -b -c -d