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DS-1000 / 828 / I have used the

Problem

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prompt

Problem:

I have used the

sklearn.preprocessing.OneHotEncoder
to transform some data the output is scipy.sparse.csr.csr_matrix how can I merge it back into my original dataframe along with the other columns?

I tried to use pd.concat but I get

TypeError: cannot concatenate a non-NDFrame object
Thanks

A:

<code>
import pandas as pd
import numpy as np
from scipy.sparse import csr_matrix
df_origin, transform_output = load_data()
</code>
df = ... # put solution in this variable
BEGIN SOLUTION
<code>

library

Sklearn

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Source and history

upstream_id / Original problem ID
828
task_id
1f7bd88f-2288-5709-89df-60b549a4391f
task_key
default--test--828
task_revision_id
1
config / split
default / test

Official source

initial import