How to Merge different CountVectorizer in Scikit-Learn

Assume that we have two different Count Vectorizers, and we want to merge them in order to end up with one unique table, where the columns will be the features of the Count Vectorizers. For example,

vecA = CountVectorizer(ngram_range=(1, 1), min_df = 1)
vecA.fit(my_document)


vecB = CountVectorizer(ngram_range=(2, 2), min_df = 5)
vecB.fit(my_document)

We can merge the features as follows:

from sklearn.pipeline import FeatureUnion

merged_features = FeatureUnion([('CountVectorizer', vecA),('CountVect', vecB)])
merged_features.transform(my_document)

Or, alternatively:

from scipy.sparse import csr_matrix, hstack

combined_features= hstack([vecA, vecB], 'csr')