Numpy hstack - “ValueError：所有输入数组必须具有相同数量的维度” - 但它们确实如此

I am trying to join two numpy arrays. In one I have a set of columns/features after running TF-IDF on a single column of text. In the other I have one column/feature which is an integer. So I read in a column of train and test data, run TF-IDF on this, and then I want to add another integer column because I think this will help my classifier learn more accurately how it should behave. I am trying to join two numpy arrays. In one I