Sifan Ye

According to [`build_layer`](https://github.com/vchoutas/smplx/blob/77cf2a7010370c1e44141fab5d15ad8a0841bc9d/smplx/body_models.py#L2280), if `model_path` is not a directory (which includes the case of doesn't exist), it will extract the first word separated by `_` as `model_type`. To avoid the...