* print_helper: optimize inputs of get_model_complexity_info

Signed-off-by: Shengjiang QUAN <qsj287068067@126.com>

* directly throw error

When "input_shape" and "inputs" are both `None` or both set,
throw ValueError.

Signed-off-by: Shengjiang QUAN <qsj287068067@126.com>

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Signed-off-by: Shengjiang QUAN <qsj287068067@126.com>