Python 为什么我们需要在get dummy函数中删除第一个参数

我有一个关于get dummy函数的问题。为什么我们需要在获取dummy时先删除_=true或

false

。使用此参数的目的是什么

我在逻辑回归中接受警告。这是“直线搜索算法未收敛”。此警告与

drop\u first=false

参数之间是否存在关系

警告完全在下面

C:\Users\aslii\lib\site-packages\scipy\optimize\linesearch.py:313: LineSearchWarning: The line search algorithm did not converge
  warn('The line search algorithm did not converge', LineSearchWarning)
C:\Users\aslii\lib\site-packages\sklearn\utils\optimize.py:195: UserWarning: Line Search failed
  warnings.warn('Line Search failed')
C:\Users\aslii\lib\site-packages\scipy\optimize\linesearch.py:313: LineSearchWarning: The line search algorithm did not converge
  warn('The line search algorithm did not converge', LineSearchWarning)
C:\Users\aslii\lib\site-packages\sklearn\utils\optimize.py:195: UserWarning: Line Search failed
  warnings.warn('Line Search failed') 

提前谢谢