code: function columnWordDataToImgDataFormatAsWords(columns, h, w) {
      const imgDataWordsLength = w * h;
  
      let convertedArr = new Array(imgDataWordsLength);
      for (var i = 0; i < imgDataWordsLength; i++) {
          const {column, depth} = serialToColumnMap(i, h, w);
          convertedArr[i] = columns[column][depth];
      }
      return convertedArr;
  }
docs: ========= HELPERS ========