How to use 'numpy combine arrays into matrix' in Python

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1298def concatenate_arrays(arrays):
1299 # concatenate data
1300 if all([type(array) is np.ndarray for array in arrays]):
1301 concatenation = np.concatenate(arrays)
1302 # if sparse, cast all to sparse and stack
1303 else:
1304 concatenation = sp_sparse.vstack(
1305 [
1306 array
1307 if isinstance(array, sp_sparse.csr_matrix)
1308 else sp_sparse.csr_matrix(array)
1309 for array in arrays
1310 ]
1311 )
1312 return concatenation

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