code: def _gen2band(self, A, ku=0, kl=0, order="C"):
      assert A.ndim == 2
      n, m = A.shape
      ldm, lda = n, 1 + ku + kl
      B = numpy.zeros((lda, ldm), dtype=A.dtype, order=order)
      for j in range(n):
          k = ku - j
          for i in range(max(0, j - ku), min(m, j + kl + 1)):
              B[(k + i), j] = A[i, j]
      return B
  
imports: import numpy
  import pytest
  import cupy
  from cupy import cublas
  from cupy import testing
label_desc: Use image node_id 1 for calling the TestSbmv obj's underlying member method code with example usage: obj._gen2band(A, ku, kl, order) and returns: B