手动划分训练集(train_data)、训练目标(train_targets)

train_data = date.loc[2:100, ['Engine Size(L)','Cylinders','Fuel Type','Fuel Consumption City (L/100/km)', Consumption Hwy (L/100 km),'Fuel Consumption Comb (L/100 km)']]

train_data.sha这里的训练集为何没有被定义

从提供的代码片段来看，似乎有一处语法错误，导致训练集未被正确定义。在代码中，'Fuel Consumption City (L/100/km)' 和 'Consumption Hwy (L/100 km)' 之间缺少了一个逗号。修复这个错误后，代码应如下所示：

train_data = date.loc[2:100, ['Engine Size(L)','Cylinders','Fuel Type','Fuel Consumption City (L/100/km)', 'Consumption Hwy (L/100 km)','Fuel Consumption Comb (L/100 km)']]

此外，请注意在代码中将 date 改为 data（如果您的数据集名称为 data），以确保代码能够正常运行。所以，完整的代码应该是：

train_data = data.loc[2:100, ['Engine Size(L)','Cylinders','Fuel Type','Fuel Consumption City (L/100/km)', 'Consumption Hwy (L/100 km)','Fuel Consumption Comb (L/100 km)']]