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sclass FaceDataSet {
  S csvSnippetID = #1032472;
  
  class Entry {
    S imageURL;
    File imageFile;
    DoubleRect facePosition;
  }
  
  L<Entry> entries;
  
  File imagesDir() { ret javaxCachesDir("Google Face Data Set"); }
  
  File downloadImage(S url) {
    File file = newFile(imagesDir(), md5FileName(url) + fileExtension(url));
    if (!file.exists())
      loadBinaryPageToFile(url, file);
    ret file;
  }
  
  void load {
    for (LS row : parseExtendedCSV_iterator(loadSnippet(csvSnippetID))) {
      int i = 0;
      for n to 3: {
        new Entry e;
        e.imageURL = row.get(i++);
        e.imageFile = downloadImage(e.imageURL);
        e.facePosition = doubleRectFromPoints(
          parseDouble(row.get(i)),   // left column  (x1)
          parseDouble(row.get(i+2)), // top row      (y1)
          parseDouble(row.get(i+1)), // right column (x2)
          parseDouble(row.get(i+3)), // bottom row   (y2)
        );
        entries.add(e);
        i += 4;
      }
    }
    
    print("Have " + nEntries(entries));
  }
}
 
/* Row begins: 
URL of image1 (string)
Top-left column of the face bounding box in image1 normalized by width (float)
Bottom-right column of the face bounding box in image1 normalized by width (float)
Top-left row of the face bounding box in image1 normalized by height (float)
Bottom-right row of the face bounding box in image1 normalized by height (float)
*/