OSError while loading sample weights

[pniedzwiedzinski]

While I was loading model with sample weights in Google Colab this exception occurred:

Using TensorFlow backend.
WARNING:tensorflow:From /usr/local/lib/python3.6/dist-packages/tensorflow/python/framework/op_def_library.py:263: colocate_with (from tensorflow.python.framework.ops) is deprecated and will be removed in a future version.
Instructions for updating:
Colocations handled automatically by placer.
---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
<ipython-input-5-913aee289ebe> in <module>()
      2 
      3 rdn = RDN(arch_params={'C':6, 'D':20, 'G':64, 'G0':64, 'x':2})
----> 4 rdn.model.load_weights('/content/image-super-resolution/weights/sample_weights/rdn-C6-D20-G64-G064-x2_div2k-e086.hdf5')
      5 
      6 sr_img = rdn.model.predict(lr_img)[0]

/usr/local/lib/python3.6/dist-packages/keras/engine/network.py in load_weights(self, filepath, by_name, skip_mismatch, reshape)
   1155         if h5py is None:
   1156             raise ImportError('`load_weights` requires h5py.')
-> 1157         with h5py.File(filepath, mode='r') as f:
   1158             if 'layer_names' not in f.attrs and 'model_weights' in f:
   1159                 f = f['model_weights']

/usr/local/lib/python3.6/dist-packages/h5py/_hl/files.py in __init__(self, name, mode, driver, libver, userblock_size, swmr, **kwds)
    310             with phil:
    311                 fapl = make_fapl(driver, libver, **kwds)
--> 312                 fid = make_fid(name, mode, userblock_size, fapl, swmr=swmr)
    313 
    314                 if swmr_support:

/usr/local/lib/python3.6/dist-packages/h5py/_hl/files.py in make_fid(name, mode, userblock_size, fapl, fcpl, swmr)
    140         if swmr and swmr_support:
    141             flags |= h5f.ACC_SWMR_READ
--> 142         fid = h5f.open(name, flags, fapl=fapl)
    143     elif mode == 'r+':
    144         fid = h5f.open(name, h5f.ACC_RDWR, fapl=fapl)

h5py/_objects.pyx in h5py._objects.with_phil.wrapper()

h5py/_objects.pyx in h5py._objects.with_phil.wrapper()

h5py/h5f.pyx in h5py.h5f.open()

OSError: Unable to open file (file signature not found)

I found that this error might mean that the file is corrupted. Or maybe it's the fault of Google Colab 🤔

[cesarandreslopez]

Same Error here. Checking on the filesizes after having done git clone, I realize that their size is only 133 bytes. I proceeded to download from the website and works fine. Odd corruption when doing git clone.

[cesarandreslopez]

@pniedzwiedzinski furthermore, from the documentation

"The samples use an upscaling factor of two. The weights used to produced these images are available under sample_weights (see Additional Information). They are stored on git lfs. If you want to download the weights you need to run git lfs pull after cloning the repository."

[pniedzwiedzinski]

@cesarandreslopez thanks, didn't notice that

[pniedzwiedzinski]

Maybe this should be also mentioned in the installation section 🤔

[cfrancesco]

Thank you for the feedback. We will make the note more explicit.

[cfrancesco]

Now git lfs pull is mentioned in the installation section. Thanks to @pniedzwiedzinski