KeyError: "Unable to open object (object 'imgs' doesn't exist)"

Question

I am trying to run a source code from a Keras tutorial for image recognition. I'm getting this error,

Traceback (most recent call last):
File "ty.py", line 52, in <module>
X, Y = hf['imgs'][:], hf['labels'][:]
File "h5py\_objects.pyx", line 54, in h5py._objects.with_phil.wrapper
File "h5py\_objects.pyx", line 55, in h5py._objects.with_phil.wrapper
File "C:\Users\alams\Anaconda3\envs\tensorflow\lib\site-
packages\h5py\_hl\group.py", line 167, in __getitem__
oid = h5o.open(self.id, self._e(name), lapl=self._lapl)
File "h5py\_objects.pyx", line 54, in h5py._objects.with_phil.wrapper
File "h5py\_objects.pyx", line 55, in h5py._objects.with_phil.wrapper
File "h5py\h5o.pyx", line 190, in h5py.h5o.open
KeyError: "Unable to open object (object 'imgs' doesn't exist)"

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "ty.py", line 66, in <module>
label = get_class(img_path)
File "ty.py", line 48, in get_class
return int(img_path.split('/')[-2])
ValueError: invalid literal for int() with base 10: 'Final_Training'

This is my source code:

def get_class(img_path):
   return int(img_path.split('/')[-2])
try:
    with  h5py.File('X.h5') as hf: 
      X, Y = hf['imgs'][:], hf['labels'][:]

except (IOError,OSError, KeyError):  
    root_dir = 'Data/Final_Training/Images/'
    imgs = []
    labels = []

    all_img_paths = glob.glob(os.path.join(root_dir, '*/*.ppm'))
    np.random.shuffle(all_img_paths)
    for img_path in all_img_paths:
        try:
            img = preprocess_img(io.imread(img_path))
            label = get_class(img_path)
            imgs.append(img)
            labels.append(label)
        except (IOError, OSError):
            print('missed', img_path)
            pass

X = np.array(imgs, dtype='float32')
Y = np.eye(NUM_CLASSES, dtype='uint8')[labels]

with h5py.File('X.h5','w') as hf:
    hf.create_dataset('imgs', data=X)
    hf.create_dataset('labels', data=Y)

I tried to run this code by removing the int Conversion from the return of the first function. But seems like all the values are not write in X.h5

desertnaut · Accepted Answer · 2018-01-03 19:27:43Z

2

You have defined img=[] inside except block (locally). That's why it doesn't have access outside the block. Define it outside the block.

 def get_class(img_path):
    return int(img_path.split('/')[-2])

 imgs=[]
 labels=[]

 #Your code

edited Jan 3, 2018 at 19:27

desertnaut

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answered Jan 3, 2018 at 9:47

Sociopath

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