fix Tensor.numpy()[0] to float(Tensor) to adapt 0D #2884
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有些Tensor正确的语义为0D Tensor，其shape为[]，当前使用了shape为[1]替代，也就是向量Tensor：
在升级为0D后，Tensor.numpy()[0] 的写法不再使用，将其改变为 float(Tensor) 的写法，兼容升级前后。