docstr: Index along the minor axis where idx is a slice object.
          
code: def _minor_slice(self, idx, copy=False):
      """Index along the minor axis where idx is a slice object."""
      M, N = self._swap(*self.shape)
      start, stop, step = idx.indices(N)
  
      if start == 0 and stop == N and step == 1:
          return self.copy() if copy else self
  
      N = len(range(start, stop, step))
      new_shape = self._swap(M, N)
  
      if N == 0 or self.nnz == 0:
          return self.__class__(new_shape, dtype=self.dtype)
      if step == 1:
          return self.__class__(
              _index._get_csr_submatrix_minor_axis(
                  self.data, self.indices, self.indptr, start, stop
              ),
              shape=new_shape,
              copy=False,
          )
      cols = cupy.arange(start, stop, step, dtype=self.indices.dtype)
      return self._minor_index_fancy(cols)
  
imports: import string
  import warnings
  import numpy
  import cupy
  import cupyx
  from cupy import _core
  from cupy._core import _scalar
  from cupy._creation import basic
  from cupyx.scipy.sparse import _base
  from cupyx.scipy.sparse import _coo
  from cupyx.scipy.sparse import _data
  from cupyx.scipy.sparse import _sputils
  from cupyx.scipy.sparse import _util
  from cupyx.scipy.sparse import _index
label_desc: Use image node_id 18 for calling the _compressed_sparse_matrix obj's underlying member method code with example usage: obj._minor_slice(idx, copy) and returns: self, unknown, self, self