zqwang-cn

tlx.split的pytorch版本实现错误

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### New Issue Checklist - [x] I have read the [Contribution Guidelines](https://github.com/tensorlayer/tensorlayer/blob/master/CONTRIBUTING.md) - [x] I searched for [existing GitHub issues](https://github.com/tensorlayer/tensorlayer/issues) ### Issue Description tlx.split的pytorch版本实现错误。tlx.split的第2个参数num_or_size_splits类型为int时，表示需要拆分成的tensor数量；但是在torch.split中第2个参数的意义为拆分出的每个tensor中在该维度上的长度。因此需要在调用前将该参数进行转换。

希望添加一些常用功能

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### New Issue Checklist - [x] I have read the [Contribution Guidelines](https://github.com/tensorlayer/tensorlayer/blob/master/CONTRIBUTING.md) - [x] I searched for [existing GitHub issues](https://github.com/tensorlayer/tensorlayer/issues) ### Issue Description 希望添加一些常用功能的官方版本，否则每个用户需要自行实现。例如： - NMS - topk - flatten...