1  from interface import Interface, implements
 2  
 3  # a Source knows where to grab the raw data from and returns Frame objects
 4  # eg: DirectoryFileSource grab all files from a dir and also a map from file_path to label_path to grab labels from
 5  # Loads all files and labels into memory (not images)
 6  class Source(Interface):
 7  
 8      def __getitem__(self,index):
 9          raise NotImplementedError
10  
11      def __next__(self):
12          raise NotImplementedError
13  
14      def __len__(self):
15          raise NotImplementedError
16  
17      def __iter__(self):
18          raise NotImplementedError