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DS-1000 / 829 / I used a sklearn function to transform some data to scipy.sparse.csr.csr_matrix.

Problem

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Problem:

I used a sklearn function to transform some data to scipy.sparse.csr.csr_matrix.
But now I want to get a pandas DataFrame where I merge it back into my original df along with the other columns.
I tried pd.concat, but I get an error called
TypeError: cannot concatenate a non-NDFrame object
What can I do? 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
829
task_id
9157963a-8ff8-527f-8039-2f0804ed722a
task_key
default--test--829
task_revision_id
1
config / split
default / test

Official source

initial import