old_contents: from cupy.sparse.base import issparse  # NOQA
  from cupy.sparse.base import isspmatrix  # NOQA
  from cupy.sparse.base import spmatrix  # NOQA
  from cupy.sparse.coo import coo_matrix  # NOQA
  from cupy.sparse.csc import csc_matrix  # NOQA
  from cupy.sparse.csr import csr_matrix  # NOQA
  
  # TODO(unno): implement bsr_matrix
  # TODO(unno): implement dia_matrix
  # TODO(unno): implement dok_matrix
  # TODO(unno): implement lil_matrix
  
  # TODO(unno): implement eye
  # TODO(unno): implement identity
  # TODO(unno): implement kron
  # TODO(unno): implement kronsum
  # TODO(unno): implement diags
  # TODO(unno): implement spdiags
  # TODO(unno): implement block_diag
  # TODO(unno): implement tril
  # TODO(unno): implement triu
  # TODO(unno): implement bmat
  # TODO(unno): implement hstack
  # TODO(unno): implement vstack
  # TODO(unno): implement rand
  # TODO(unno): implement random
  
  # TODO(unno): implement save_npz
  # TODO(unno): implement load_npz
  
  # TODO(unno): implement find
  
  # TODO(unno): implement isspmatrix_csc(x)
  # TODO(unno): implement isspmatrix_csr(x)
  # TODO(unno): implement isspmatrix_bsr(x)
  # TODO(unno): implement isspmatrix_lil(x)
  # TODO(unno): implement isspmatrix_dok(x)
  # TODO(unno): implement isspmatrix_coo(x)
  # TODO(unno): implement isspmatrix_dia(x)
  
new_contents: from cupy.sparse.base import issparse  # NOQA
  from cupy.sparse.base import isspmatrix  # NOQA
  from cupy.sparse.base import spmatrix  # NOQA
  from cupy.sparse.csc import csc_matrix  # NOQA
  from cupy.sparse.csr import csr_matrix  # NOQA
  
  # TODO(unno): implement bsr_matrix
  # TODO(unno): implement coo_matrix
  # TODO(unno): implement dia_matrix
  # TODO(unno): implement dok_matrix
  # TODO(unno): implement lil_matrix
  
  # TODO(unno): implement eye
  # TODO(unno): implement identity
  # TODO(unno): implement kron
  # TODO(unno): implement kronsum
  # TODO(unno): implement diags
  # TODO(unno): implement spdiags
  # TODO(unno): implement block_diag
  # TODO(unno): implement tril
  # TODO(unno): implement triu
  # TODO(unno): implement bmat
  # TODO(unno): implement hstack
  # TODO(unno): implement vstack
  # TODO(unno): implement rand
  # TODO(unno): implement random
  
  # TODO(unno): implement save_npz
  # TODO(unno): implement load_npz
  
  # TODO(unno): implement find
  
  # TODO(unno): implement isspmatrix_csc(x)
  # TODO(unno): implement isspmatrix_csr(x)
  # TODO(unno): implement isspmatrix_bsr(x)
  # TODO(unno): implement isspmatrix_lil(x)
  # TODO(unno): implement isspmatrix_dok(x)
  # TODO(unno): implement isspmatrix_coo(x)
  # TODO(unno): implement isspmatrix_dia(x)
  
subject: Update init