Fix the normalization of logits in Categorical #70964
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paddle.distribution.categorical对接受的logits参数并未采用softmax函数进行归一后传递给self._prob，导致其创建的概率分布时的逻辑与torch.distributions.Categorical接受probs参数一致，而与torch接受logits参数的逻辑不同。因此将归一方法更正为softmax函数，更改后categorical的行为与torch一致。
测试效果参考文档：https://ku.baidu-int.com/knowledge/HFVrC7hq1Q/pKzJfZczuc/qv-vZnw7HE/HnwAXB-xDS0-4B