Code to get RLE notation used in the submission:

```
#https://www.kaggle.com/paulorzp/rle-functions-run-lenght-encode-decode
def mask2rle(img):

    '''
    img: numpy array, 1 -> mask, 0 -> background
    Returns run length as string formated
    '''
    pixels= img.T.flatten()
    pixels = np.concatenate([[0], pixels, [0]])
    runs = np.where(pixels[1:] != pixels[:-1])[0] + 1
    runs[1::2] -= runs[::2]
    return ' '.join(str(x) for x in runs)
```