code: def delta_e_cie1976(lab_color_vector, lab_color_matrix):
      
      return numpy.sqrt(
          numpy.sum(numpy.power(lab_color_vector - lab_color_matrix, 2), axis=1))
docs: Calculates the Delta E (CIE1976) between `lab_color_vector` and all
      colors in `lab_color_matrix`.