X_band_1=np.array([np.array(band).astype(np.float32).reshape(75, 75) for band in tt["band_1"]])
    X_band_2=np.array([np.array(band).astype(np.float32).reshape(75, 75) for band in tt["band_2"]])
    X_train = np.concatenate([X_band_1[:, :, :, np.newaxis], X_band_2[:, :, :, np.newaxis],((X_band_1/X_band_2))[:, :, :, np.newaxis]], axis=-1)
    return X_train