@sh.add_function(dsp, outputs=['n_gears'])
@sh.add_function(dsp, inputs=['velocity_speed_ratios'], outputs=['n_gears'])
def identify_n_gears(gear_box_ratios):
"""
Identify the number of gears [-].
:param gear_box_ratios:
Gear box ratios [-].
:type gear_box_ratios: dict[int, float | int]
:return:
Number of gears [-].
:rtype: int
"""
return max(gear_box_ratios)