Support for python 3

[wecacuee]

I was able to run the latest version with python 3 using @moshanATucsd trained model.

(py35) vdhiman@dwarf:~/.../StarMap-xingyizhou/tools$ python EvalViewPoint.py ../exp/Pascal3DTEST/preds.pth                             
==> initializing pascal3d val data.                                                                                           
Loaded Pascal3D val 2113 samples                                                                                              
Eval |#####################           | [1436/2113]|Total: 0:00:12 | ETA: 0:00:06 | Acc_10: 0.489214 | Acc_30: 0.828114/home/vdhiman/wr
k/orcvio-frontend/src/StarMap-xingyizhou/tools/../lib/starmap/utils/horn87.py:32: ComplexWarning: Casting complex values to real discar
ds the imaginary part                                                                                                         
  return R.astype(np.float32), t.astype(np.float32), s                                                                        
Eval |################################| [2112/2113]|Total: 0:00:17 | ETA: 0:00:01 | Acc_10: 0.478467 | Acc_30: 0.813535                
|        |aeroplane|bicycle |boat    |bottle  |bus     |car     |chair   |diningtable|motorbike|sofa    |train   |tvmonitor| Mean |
|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|
| Acc10  |0.4764  |0.2627  |0.1336  |0.5339  |0.8831  |0.7045  |0.4467  |0.1429  |0.3088  |0.5128  |0.6283  |0.3874  |0.4785 |
| Acc30  |0.8255  |0.8305  |0.4784  |0.9004  |0.9805  |0.9123  |0.7869  |0.4286  |0.8603  |0.9231  |0.7876  |0.8198  |0.8135 |
| Mid    |  10.84 |  14.73 |  30.56 |   9.48 |   3.56 |   6.09 |  11.48 |  32.00 |  13.69 |   9.97 |   6.88 |  13.07 |  10.55|
(py35) vdhiman@dwarf:~/.../StarMap-xingyizhou/tools$