如何使用NumPy将包含字符串和浮点值的CSV文件读入二维数组

我需要使用NumPy（并且仅使用NumPy，而不是Pandas或SkLearn等）来读取CSV文件。CSV文件包含的元素如下所示：

PassengerId,Survived,Pclass,Name,Sex,Age,SibSp,Parch,Ticket,Fare,Cabin,Embarked
1,0,3,"Braund, Mr. Owen Harris",male,22,1,0,A/5 21171,7.25,,S
2,1,1,"Cumings, Mrs. John Bradley (Florence Briggs Thayer)",female,38,1,0,PC 17599,71.2833,C85,C
3,1,3,"Heikkinen, Miss. Laina",female,26,0,0,STON/O2. 3101282,7.925,,S
4,1,1,"Futrelle, Mrs. Jacques Heath (Lily May Peel)",female,35,1,0,113803,53.1,C123,S

我正在读取和打印数据，如下所示：

dataset = np.genfromtxt(dataset_path, delimiter=',', names=True, skip_header=1)
print(titanic_dataset)

正在读取文件，但是在查看输出时，缺少字符串信息（显示为nan：

[(  2., 1., 1., nan, nan, nan, 38.  , 1., 0.,          nan,  71.2833, nan, nan)
 (  3., 1., 3., nan, nan, nan, 26.  , 0., 0.,          nan,   7.925 , nan, nan)
 (  4., 1., 1., nan, nan, nan, 35.  , 1., 0., 1.138030e+05,  53.1   , nan, nan)
 (  5., 0., 3., nan, nan, nan, 35.  , 0., 0., 3.734500e+05,   8.05  , nan, nan)
 (  6., 0., 3., nan, nan, nan,   nan, 0., 0., 3.308770e+05,   8.4583, nan, nan)]

如何读取此csv文件，同时保持逗号作为定界符并读取字符串值？