title: 'AssertionError: Torch not compiled with CUDA enabled'
body: <p>I use my macbook to run this '<code>python3 demo.py --indir ${img_directory} --outdir examples/res</code>' command to get the human pose, but the error says 'Torch not compiled with CUDA enabled'.</p>
  
  <p>I have tried to reinstall the 'torch' package which version is '<code>torch-1.0.0-cp37-none-macosx_10_7_x86_64.whl</code>' ,but it dose not work.</p>
  
  <pre><code>guozirongMBP:AlphaPose guozirong$ python3 demo.py --list examples/list-coco-demo.txt --indir /Users/guozirong/Downloads/image  --outdir examples/res --save_img
  Loading YOLO model..
  Process Process-1:
  Traceback (most recent call last):
    File "/usr/local/Cellar/python/3.7.2_2/Frameworks/Python.framework/Versions/3.7/lib/python3.7/multiprocessing/process.py", line 297, in _bootstrap
      self.run()
    File "/usr/local/Cellar/python/3.7.2_2/Frameworks/Python.framework/Versions/3.7/lib/python3.7/multiprocessing/process.py", line 99, in run
      self._target(*self._args, **self._kwargs)
    File "/Users/guozirong/AlphaPose/dataloader.py", line 151, in getitem_yolo
      img_k, orig_img_k, im_dim_list_k = prep_image(im_name_k, inp_dim)
    File "/Users/guozirong/AlphaPose/yolo/preprocess.py", line 42, in prep_image
      dim = orig_im.shape[1], orig_im.shape[0]
  AttributeError: 'NoneType' object has no attribute 'shape'
  Traceback (most recent call last):
    File "demo.py", line 50, in &lt;module&gt;
      det_loader = DetectionLoader(data_loader, batchSize=args.detbatch).start()
    File "/Users/guozirong/AlphaPose/dataloader.py", line 282, in __init__
      self.det_model.cuda()
    File "/usr/local/lib/python3.7/site-packages/torch/nn/modules/module.py", line 260, in cuda
      return self._apply(lambda t: t.cuda(device))
    File "/usr/local/lib/python3.7/site-packages/torch/nn/modules/module.py", line 187, in _apply
      module._apply(fn)
    File "/usr/local/lib/python3.7/site-packages/torch/nn/modules/module.py", line 187, in _apply
      module._apply(fn)
    File "/usr/local/lib/python3.7/site-packages/torch/nn/modules/module.py", line 187, in _apply
      module._apply(fn)
    File "/usr/local/lib/python3.7/site-packages/torch/nn/modules/module.py", line 193, in _apply
      param.data = fn(param.data)
    File "/usr/local/lib/python3.7/site-packages/torch/nn/modules/module.py", line 260, in &lt;lambda&gt;
      return self._apply(lambda t: t.cuda(device))
    File "/usr/local/lib/python3.7/site-packages/torch/cuda/__init__.py", line 161, in _lazy_init
      _check_driver()
    File "/usr/local/lib/python3.7/site-packages/torch/cuda/__init__.py", line 75, in _check_driver
      raise AssertionError("Torch not compiled with CUDA enabled")
  AssertionError: Torch not compiled with CUDA enabled
  </code></pre>