Update eval_AGORA.py

[zeng-yifei]

Hi, Doc. Sun. It's me again. I find eval_AGORA.py still contains some bugs. When I run this script. I find the outputs['joints'] and the outputs['pj2d_org'] are ndarrays, but would be errorly used as a tensor. So it will report bugs like:

AttributeError: 'numpy.ndarray' object has no attribute 'contiguous' or

'numpy.ndarray' object has no attribute 'cpu'

so I made them converted to tensor to fix the error.

[Arthur151]

Thanks for reporting the issues. The bug is fixed in last commit.